From 92054291894973d4e4a0d2d6951c2a01a40e9c82 Mon Sep 17 00:00:00 2001
From: Timo Tijhof <krinkle@fastmail.com>
Date: Thu, 18 Jan 2024 23:51:14 +0600
Subject: [PATCH] test: Remove unused lessjs 1.x fixtures

Change-Id: I7f7d58913ea23170561105821ad35b6ae0c557d4
---
 test/Fixtures/lessjs (1.5)/css/a.css          |    6 -
 test/Fixtures/lessjs (1.5)/css/charsets.css   |    1 -
 test/Fixtures/lessjs (1.5)/css/colors.css     |   80 -
 test/Fixtures/lessjs (1.5)/css/comments.css   |   69 -
 .../css/compression/compression.css           |    3 -
 test/Fixtures/lessjs (1.5)/css/css-3.css      |  125 -
 .../Fixtures/lessjs (1.5)/css/css-escapes.css |   24 -
 test/Fixtures/lessjs (1.5)/css/css-guards.css |   18 -
 test/Fixtures/lessjs (1.5)/css/css.css        |   95 -
 .../css/debug/linenumbers-all.css             |   43 -
 .../css/debug/linenumbers-comments.css        |   35 -
 .../css/debug/linenumbers-mediaquery.css      |   35 -
 .../lessjs (1.5)/css/extend-chaining.css      |   81 -
 .../lessjs (1.5)/css/extend-clearfix.css      |   19 -
 .../lessjs (1.5)/css/extend-exact.css         |   37 -
 .../lessjs (1.5)/css/extend-media.css         |   24 -
 .../Fixtures/lessjs (1.5)/css/extend-nest.css |   57 -
 .../lessjs (1.5)/css/extend-selector.css      |   80 -
 test/Fixtures/lessjs (1.5)/css/extend.css     |   76 -
 .../lessjs (1.5)/css/extract-and-length.css   |  133 -
 test/Fixtures/lessjs (1.5)/css/functions.css  |  139 -
 test/Fixtures/lessjs (1.5)/css/ie-filters.css |    9 -
 .../lessjs (1.5)/css/import-inline.css        |    5 -
 .../lessjs (1.5)/css/import-interpolation.css |    6 -
 .../Fixtures/lessjs (1.5)/css/import-once.css |   15 -
 .../lessjs (1.5)/css/import-reference.css     |   55 -
 test/Fixtures/lessjs (1.5)/css/import.css     |   36 -
 test/Fixtures/lessjs (1.5)/css/javascript.css |   23 -
 test/Fixtures/lessjs (1.5)/css/lazy-eval.css  |    3 -
 .../lessjs (1.5)/css/legacy/legacy.css        |    7 -
 test/Fixtures/lessjs (1.5)/css/media.css      |  219 -
 test/Fixtures/lessjs (1.5)/css/merge.css      |   22 -
 .../Fixtures/lessjs (1.5)/css/mixins-args.css |  113 -
 .../lessjs (1.5)/css/mixins-closure.css       |    9 -
 .../lessjs (1.5)/css/mixins-guards.css        |   82 -
 .../lessjs (1.5)/css/mixins-important.css     |   45 -
 .../lessjs (1.5)/css/mixins-named-args.css    |   27 -
 .../lessjs (1.5)/css/mixins-nested.css        |   14 -
 .../lessjs (1.5)/css/mixins-pattern.css       |   47 -
 test/Fixtures/lessjs (1.5)/css/mixins.css     |  141 -
 test/Fixtures/lessjs (1.5)/css/no-output.css  |    0
 test/Fixtures/lessjs (1.5)/css/operations.css |   49 -
 test/Fixtures/lessjs (1.5)/css/parens.css     |   33 -
 test/Fixtures/lessjs (1.5)/css/rulesets.css   |   33 -
 test/Fixtures/lessjs (1.5)/css/scope.css      |   35 -
 test/Fixtures/lessjs (1.5)/css/selectors.css  |  142 -
 .../lessjs (1.5)/css/static-urls/urls.css     |   41 -
 test/Fixtures/lessjs (1.5)/css/strings.css    |   43 -
 test/Fixtures/lessjs (1.5)/css/urls.css       |   63 -
 test/Fixtures/lessjs (1.5)/css/variables.css  |   45 -
 test/Fixtures/lessjs (1.5)/css/whitespace.css |   42 -
 .../lessjs (1.5)/data/data-uri-fail.png       |  Bin 52420 -> 0 bytes
 test/Fixtures/lessjs (1.5)/data/image.jpg     |    1 -
 test/Fixtures/lessjs (1.5)/data/page.html     |    1 -
 test/Fixtures/lessjs (1.5)/expected/a.css     |   13 -
 .../lessjs (1.5)/expected/charsets.css        |    1 -
 .../Fixtures/lessjs (1.5)/expected/colors.css |   80 -
 .../lessjs (1.5)/expected/comments.css        |   69 -
 test/Fixtures/lessjs (1.5)/expected/css-3.css |  125 -
 .../lessjs (1.5)/expected/css-escapes.css     |   24 -
 .../lessjs (1.5)/expected/css-guards.css      |   18 -
 test/Fixtures/lessjs (1.5)/expected/css.css   |   95 -
 .../lessjs (1.5)/expected/extend-chaining.css |   81 -
 .../lessjs (1.5)/expected/extend-clearfix.css |   19 -
 .../lessjs (1.5)/expected/extend-exact.css    |   37 -
 .../lessjs (1.5)/expected/extend-media.css    |   24 -
 .../lessjs (1.5)/expected/extend-nest.css     |   57 -
 .../lessjs (1.5)/expected/extend-selector.css |   80 -
 .../Fixtures/lessjs (1.5)/expected/extend.css |   76 -
 .../expected/extract-and-length.css           |  133 -
 .../lessjs (1.5)/expected/functions.css       |  139 -
 .../lessjs (1.5)/expected/ie-filters.css      |    9 -
 .../lessjs (1.5)/expected/import-inline.css   |    5 -
 .../expected/import-interpolation.css         |    6 -
 .../lessjs (1.5)/expected/import-once.css     |   15 -
 .../expected/import-reference.css             |   55 -
 .../Fixtures/lessjs (1.5)/expected/import.css |   36 -
 .../lessjs (1.5)/expected/javascript.css      |   20 -
 .../lessjs (1.5)/expected/lazy-eval.css       |    3 -
 test/Fixtures/lessjs (1.5)/expected/media.css |  219 -
 test/Fixtures/lessjs (1.5)/expected/merge.css |   22 -
 .../lessjs (1.5)/expected/mixins-args.css     |  113 -
 .../lessjs (1.5)/expected/mixins-closure.css  |    9 -
 .../lessjs (1.5)/expected/mixins-guards.css   |   82 -
 .../expected/mixins-important.css             |   45 -
 .../expected/mixins-named-args.css            |   27 -
 .../lessjs (1.5)/expected/mixins-nested.css   |   14 -
 .../lessjs (1.5)/expected/mixins-pattern.css  |   47 -
 .../Fixtures/lessjs (1.5)/expected/mixins.css |  141 -
 .../lessjs (1.5)/expected/no-output.css       |    1 -
 .../lessjs (1.5)/expected/operations.css      |   49 -
 .../Fixtures/lessjs (1.5)/expected/parens.css |   33 -
 .../lessjs (1.5)/expected/rulesets.css        |   33 -
 test/Fixtures/lessjs (1.5)/expected/scope.css |   35 -
 .../lessjs (1.5)/expected/selectors.css       |  142 -
 .../lessjs (1.5)/expected/strings.css         |   43 -
 test/Fixtures/lessjs (1.5)/expected/urls.css  |   63 -
 .../lessjs (1.5)/expected/variables.css       |   45 -
 .../lessjs (1.5)/expected/whitespace.css      |   42 -
 test/Fixtures/lessjs (1.5)/less/a.less        |   17 -
 test/Fixtures/lessjs (1.5)/less/charsets.less |    3 -
 test/Fixtures/lessjs (1.5)/less/colors.less   |   92 -
 test/Fixtures/lessjs (1.5)/less/comments.less |   83 -
 .../less/compression/compression.less         |   32 -
 test/Fixtures/lessjs (1.5)/less/css-3.less    |  125 -
 .../lessjs (1.5)/less/css-escapes.less        |   33 -
 .../lessjs (1.5)/less/css-guards.less         |   64 -
 test/Fixtures/lessjs (1.5)/less/css.less      |  108 -
 .../lessjs (1.5)/less/debug/import/test.less  |   25 -
 .../lessjs (1.5)/less/debug/linenumbers.less  |   23 -
 .../less/errors/add-mixed-units.less          |    3 -
 .../less/errors/add-mixed-units.txt           |    2 -
 .../less/errors/add-mixed-units2.less         |    3 -
 .../less/errors/add-mixed-units2.txt          |    2 -
 .../errors/bad-variable-declaration1.less     |    1 -
 .../less/errors/bad-variable-declaration1.txt |    2 -
 .../less/errors/color-func-invalid-color.less |    3 -
 .../less/errors/color-func-invalid-color.txt  |    4 -
 .../less/errors/color-operation-error.less    |    3 -
 .../less/errors/color-operation-error.txt     |    2 -
 .../less/errors/comment-in-selector.less      |    1 -
 .../less/errors/comment-in-selector.txt       |    2 -
 .../less/errors/divide-mixed-units.less       |    3 -
 .../less/errors/divide-mixed-units.txt        |    4 -
 .../less/errors/extend-no-selector.less       |    3 -
 .../less/errors/extend-no-selector.txt        |    3 -
 .../less/errors/extend-not-at-end.less        |    3 -
 .../less/errors/extend-not-at-end.txt         |    3 -
 .../less/errors/import-missing.less           |    6 -
 .../less/errors/import-missing.txt            |    3 -
 .../less/errors/import-no-semi.less           |    1 -
 .../less/errors/import-no-semi.txt            |    2 -
 .../less/errors/import-subfolder1.less        |    1 -
 .../less/errors/import-subfolder1.txt         |    3 -
 .../less/errors/import-subfolder2.less        |    1 -
 .../less/errors/import-subfolder2.txt         |    2 -
 .../errors/imports/import-subfolder1.less     |    1 -
 .../errors/imports/import-subfolder2.less     |    1 -
 .../less/errors/imports/import-test.less      |    4 -
 .../imports/subfolder/mixin-not-defined.less  |    1 -
 .../subfolder/parse-error-curly-bracket.less  |    1 -
 .../less/errors/javascript-error.less         |    3 -
 .../less/errors/javascript-error.txt          |    4 -
 .../errors/mixed-mixin-definition-args-1.less |    6 -
 .../errors/mixed-mixin-definition-args-1.txt  |    4 -
 .../errors/mixed-mixin-definition-args-2.less |    6 -
 .../errors/mixed-mixin-definition-args-2.txt  |    4 -
 .../less/errors/mixin-not-defined.less        |   11 -
 .../less/errors/mixin-not-defined.txt         |    3 -
 .../less/errors/mixin-not-matched.less        |    6 -
 .../less/errors/mixin-not-matched.txt         |    3 -
 .../less/errors/mixin-not-matched2.less       |    6 -
 .../less/errors/mixin-not-matched2.txt        |    3 -
 .../multiple-guards-on-css-selectors.less     |    4 -
 .../multiple-guards-on-css-selectors.txt      |    4 -
 .../less/errors/multiply-mixed-units.less     |    7 -
 .../less/errors/multiply-mixed-units.txt      |    4 -
 .../less/errors/parens-error-1.less           |    3 -
 .../less/errors/parens-error-1.txt            |    4 -
 .../less/errors/parens-error-2.less           |    3 -
 .../less/errors/parens-error-2.txt            |    4 -
 .../less/errors/parens-error-3.less           |    3 -
 .../less/errors/parens-error-3.txt            |    4 -
 .../errors/parse-error-curly-bracket.less     |    1 -
 .../less/errors/parse-error-curly-bracket.txt |    2 -
 .../errors/parse-error-missing-bracket.less   |    2 -
 .../errors/parse-error-missing-bracket.txt    |    3 -
 .../less/errors/parse-error-with-import.less  |   13 -
 .../less/errors/parse-error-with-import.txt   |    4 -
 .../less/errors/property-ie5-hack.less        |    3 -
 .../less/errors/property-ie5-hack.txt         |    4 -
 .../less/errors/property-in-root.less         |    4 -
 .../less/errors/property-in-root.txt          |    4 -
 .../less/errors/property-in-root2.less        |    1 -
 .../less/errors/property-in-root2.txt         |    4 -
 .../less/errors/property-in-root3.less        |    4 -
 .../less/errors/property-in-root3.txt         |    3 -
 .../less/errors/recursive-variable.less       |    1 -
 .../less/errors/recursive-variable.txt        |    2 -
 .../less/errors/svg-gradient1.less            |    3 -
 .../less/errors/svg-gradient1.txt             |    4 -
 .../less/errors/svg-gradient2.less            |    3 -
 .../less/errors/svg-gradient2.txt             |    4 -
 .../less/errors/svg-gradient3.less            |    3 -
 .../less/errors/svg-gradient3.txt             |    4 -
 .../less/errors/unit-function.less            |    3 -
 .../less/errors/unit-function.txt             |    4 -
 .../lessjs (1.5)/less/extend-chaining.less    |   91 -
 .../lessjs (1.5)/less/extend-clearfix.less    |   19 -
 .../lessjs (1.5)/less/extend-exact.less       |   46 -
 .../lessjs (1.5)/less/extend-media.less       |   24 -
 .../lessjs (1.5)/less/extend-nest.less        |   65 -
 .../lessjs (1.5)/less/extend-selector.less    |   99 -
 test/Fixtures/lessjs (1.5)/less/extend.less   |   81 -
 .../lessjs (1.5)/less/extract-and-length.less |  133 -
 .../Fixtures/lessjs (1.5)/less/functions.less |  153 -
 .../lessjs (1.5)/less/ie-filters.less         |   15 -
 .../lessjs (1.5)/less/import-inline.less      |    2 -
 .../less/import-interpolation.less            |    8 -
 .../lessjs (1.5)/less/import-once.less        |    6 -
 .../lessjs (1.5)/less/import-reference.less   |   18 -
 test/Fixtures/lessjs (1.5)/less/import.less   |   21 -
 .../import/deeper/import-once-test-a.less     |    1 -
 .../import-and-relative-paths-test.less       |    6 -
 .../less/import/import-charset-test.less      |    1 -
 .../less/import/import-interpolation.less     |    1 -
 .../less/import/import-interpolation2.less    |    5 -
 .../less/import/import-once-test-c.less       |    6 -
 .../less/import/import-reference.less         |   43 -
 .../less/import/import-test-a.less            |    3 -
 .../less/import/import-test-b.less            |    8 -
 .../less/import/import-test-c.less            |    6 -
 .../less/import/import-test-d.css             |    1 -
 .../less/import/import-test-e.less            |    2 -
 .../less/import/import-test-f.less            |    5 -
 .../less/import/imports/font.less             |    8 -
 .../less/import/imports/logo.less             |    5 -
 .../lessjs (1.5)/less/import/invalid-css.less |    1 -
 .../lessjs (1.5)/less/import/urls.less        |    1 -
 .../lessjs (1.5)/less/javascript.less         |   29 -
 .../Fixtures/lessjs (1.5)/less/lazy-eval.less |    6 -
 .../lessjs (1.5)/less/legacy/legacy.less      |    7 -
 test/Fixtures/lessjs (1.5)/less/media.less    |  234 -
 test/Fixtures/lessjs (1.5)/less/merge.less    |   51 -
 .../lessjs (1.5)/less/mixins-args.less        |  215 -
 .../lessjs (1.5)/less/mixins-closure.less     |   26 -
 .../lessjs (1.5)/less/mixins-guards.less      |  153 -
 .../lessjs (1.5)/less/mixins-important.less   |   25 -
 .../lessjs (1.5)/less/mixins-named-args.less  |   36 -
 .../lessjs (1.5)/less/mixins-nested.less      |   22 -
 .../lessjs (1.5)/less/mixins-pattern.less     |   99 -
 test/Fixtures/lessjs (1.5)/less/mixins.less   |  141 -
 .../less/no-js-errors/no-js-errors.less       |    3 -
 .../less/no-js-errors/no-js-errors.txt        |    4 -
 .../Fixtures/lessjs (1.5)/less/no-output.less |    2 -
 .../lessjs (1.5)/less/operations.less         |   62 -
 test/Fixtures/lessjs (1.5)/less/parens.less   |   41 -
 test/Fixtures/lessjs (1.5)/less/rulesets.less |   30 -
 test/Fixtures/lessjs (1.5)/less/scope.less    |   79 -
 .../Fixtures/lessjs (1.5)/less/selectors.less |  144 -
 .../lessjs (1.5)/less/sourcemaps/basic.less   |   27 -
 .../lessjs (1.5)/less/sourcemaps/imported.css |    7 -
 .../lessjs (1.5)/less/static-urls/urls.less   |   33 -
 test/Fixtures/lessjs (1.5)/less/strings.less  |   57 -
 test/Fixtures/lessjs (1.5)/less/urls.less     |   67 -
 .../Fixtures/lessjs (1.5)/less/variables.less |   83 -
 .../lessjs (1.5)/less/whitespace.less         |   44 -
 test/Fixtures/lessjs (1.6)/css/charsets.css   |    1 -
 test/Fixtures/lessjs (1.6)/css/colors.css     |   87 -
 test/Fixtures/lessjs (1.6)/css/comments.css   |   69 -
 .../css/compression/compression.css           |    3 -
 test/Fixtures/lessjs (1.6)/css/css-3.css      |  129 -
 .../Fixtures/lessjs (1.6)/css/css-escapes.css |   24 -
 test/Fixtures/lessjs (1.6)/css/css-guards.css |   37 -
 test/Fixtures/lessjs (1.6)/css/css.css        |   95 -
 .../css/debug/linenumbers-all.css             |   49 -
 .../css/debug/linenumbers-comments.css        |   40 -
 .../css/debug/linenumbers-mediaquery.css      |   40 -
 test/Fixtures/lessjs (1.6)/css/empty.css      |    0
 .../lessjs (1.6)/css/extend-chaining.css      |   81 -
 .../lessjs (1.6)/css/extend-clearfix.css      |   19 -
 .../lessjs (1.6)/css/extend-exact.css         |   37 -
 .../lessjs (1.6)/css/extend-media.css         |   24 -
 .../Fixtures/lessjs (1.6)/css/extend-nest.css |   57 -
 .../lessjs (1.6)/css/extend-selector.css      |   80 -
 test/Fixtures/lessjs (1.6)/css/extend.css     |   76 -
 .../lessjs (1.6)/css/extract-and-length.css   |  133 -
 test/Fixtures/lessjs (1.6)/css/functions.css  |  141 -
 .../lessjs (1.6)/css/globalVars/extended.css  |   12 -
 .../lessjs (1.6)/css/globalVars/simple.css    |    6 -
 test/Fixtures/lessjs (1.6)/css/ie-filters.css |    9 -
 .../lessjs (1.6)/css/import-inline.css        |    5 -
 .../lessjs (1.6)/css/import-interpolation.css |    6 -
 .../Fixtures/lessjs (1.6)/css/import-once.css |   15 -
 .../lessjs (1.6)/css/import-reference.css     |   49 -
 test/Fixtures/lessjs (1.6)/css/import.css     |   36 -
 test/Fixtures/lessjs (1.6)/css/javascript.css |   23 -
 test/Fixtures/lessjs (1.6)/css/lazy-eval.css  |    3 -
 .../lessjs (1.6)/css/legacy/legacy.css        |    7 -
 test/Fixtures/lessjs (1.6)/css/media.css      |  219 -
 test/Fixtures/lessjs (1.6)/css/merge.css      |   26 -
 .../Fixtures/lessjs (1.6)/css/mixins-args.css |  113 -
 .../lessjs (1.6)/css/mixins-closure.css       |    9 -
 .../css/mixins-guards-default-func.css        |  129 -
 .../lessjs (1.6)/css/mixins-guards.css        |   82 -
 .../lessjs (1.6)/css/mixins-important.css     |   45 -
 .../lessjs (1.6)/css/mixins-interpolated.css  |   39 -
 .../lessjs (1.6)/css/mixins-named-args.css    |   27 -
 .../lessjs (1.6)/css/mixins-nested.css        |   14 -
 .../lessjs (1.6)/css/mixins-pattern.css       |   47 -
 test/Fixtures/lessjs (1.6)/css/mixins.css     |  141 -
 .../lessjs (1.6)/css/modifyVars/extended.css  |    9 -
 test/Fixtures/lessjs (1.6)/css/no-output.css  |    0
 test/Fixtures/lessjs (1.6)/css/operations.css |   49 -
 test/Fixtures/lessjs (1.6)/css/parens.css     |   36 -
 .../lessjs (1.6)/css/property-name-interp.css |   20 -
 test/Fixtures/lessjs (1.6)/css/rulesets.css   |   33 -
 test/Fixtures/lessjs (1.6)/css/scope.css      |   35 -
 test/Fixtures/lessjs (1.6)/css/selectors.css  |  153 -
 .../lessjs (1.6)/css/static-urls/urls.css     |   45 -
 test/Fixtures/lessjs (1.6)/css/strings.css    |   43 -
 .../lessjs (1.6)/css/url-args/urls.css        |   56 -
 test/Fixtures/lessjs (1.6)/css/urls.css       |   71 -
 test/Fixtures/lessjs (1.6)/css/variables.css  |   45 -
 test/Fixtures/lessjs (1.6)/css/whitespace.css |   42 -
 .../lessjs (1.6)/data/data-uri-fail.png       |  Bin 52420 -> 0 bytes
 test/Fixtures/lessjs (1.6)/data/image.jpg     |    1 -
 test/Fixtures/lessjs (1.6)/data/page.html     |    1 -
 .../lessjs (1.6)/expected/charsets.css        |    1 -
 .../Fixtures/lessjs (1.6)/expected/colors.css |   87 -
 .../lessjs (1.6)/expected/comments.css        |   69 -
 test/Fixtures/lessjs (1.6)/expected/css-3.css |  129 -
 .../lessjs (1.6)/expected/css-escapes.css     |   24 -
 .../lessjs (1.6)/expected/css-guards.css      |   37 -
 test/Fixtures/lessjs (1.6)/expected/css.css   |   95 -
 test/Fixtures/lessjs (1.6)/expected/empty.css |    1 -
 .../lessjs (1.6)/expected/extend-chaining.css |   81 -
 .../lessjs (1.6)/expected/extend-clearfix.css |   19 -
 .../lessjs (1.6)/expected/extend-exact.css    |   37 -
 .../lessjs (1.6)/expected/extend-media.css    |   24 -
 .../lessjs (1.6)/expected/extend-nest.css     |   57 -
 .../lessjs (1.6)/expected/extend-selector.css |   80 -
 .../Fixtures/lessjs (1.6)/expected/extend.css |   76 -
 .../expected/extract-and-length.css           |  133 -
 .../lessjs (1.6)/expected/functions.css       |  141 -
 .../lessjs (1.6)/expected/ie-filters.css      |    9 -
 .../lessjs (1.6)/expected/import-inline.css   |    5 -
 .../expected/import-interpolation.css         |    6 -
 .../lessjs (1.6)/expected/import-once.css     |   15 -
 .../expected/import-reference.css             |   49 -
 .../Fixtures/lessjs (1.6)/expected/import.css |   36 -
 .../lessjs (1.6)/expected/javascript.css      |   20 -
 .../lessjs (1.6)/expected/lazy-eval.css       |    3 -
 test/Fixtures/lessjs (1.6)/expected/media.css |  219 -
 test/Fixtures/lessjs (1.6)/expected/merge.css |   26 -
 .../lessjs (1.6)/expected/mixins-args.css     |  113 -
 .../lessjs (1.6)/expected/mixins-closure.css  |    9 -
 .../expected/mixins-guards-default-func.css   |  129 -
 .../lessjs (1.6)/expected/mixins-guards.css   |   82 -
 .../expected/mixins-important.css             |   45 -
 .../expected/mixins-interpolated.css          |   39 -
 .../expected/mixins-named-args.css            |   27 -
 .../lessjs (1.6)/expected/mixins-nested.css   |   14 -
 .../lessjs (1.6)/expected/mixins-pattern.css  |   47 -
 .../Fixtures/lessjs (1.6)/expected/mixins.css |  141 -
 .../lessjs (1.6)/expected/no-output.css       |    1 -
 .../lessjs (1.6)/expected/operations.css      |   49 -
 .../Fixtures/lessjs (1.6)/expected/parens.css |   36 -
 .../expected/property-name-interp.css         |   20 -
 .../lessjs (1.6)/expected/rulesets.css        |   33 -
 test/Fixtures/lessjs (1.6)/expected/scope.css |   35 -
 .../lessjs (1.6)/expected/selectors.css       |  153 -
 .../lessjs (1.6)/expected/strings.css         |   43 -
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diff --git a/test/Fixtures/lessjs (1.5)/css/a.css b/test/Fixtures/lessjs (1.5)/css/a.css
deleted file mode 100644
index bdeeac44..00000000
--- a/test/Fixtures/lessjs (1.5)/css/a.css	
+++ /dev/null
@@ -1,6 +0,0 @@
-.mixin {
-  font-weight: bold;
-}
-body {
-  font-weight: bold;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/charsets.css b/test/Fixtures/lessjs (1.5)/css/charsets.css
deleted file mode 100644
index 9f44090c..00000000
--- a/test/Fixtures/lessjs (1.5)/css/charsets.css	
+++ /dev/null
@@ -1 +0,0 @@
-@charset "UTF-8";
diff --git a/test/Fixtures/lessjs (1.5)/css/colors.css b/test/Fixtures/lessjs (1.5)/css/colors.css
deleted file mode 100644
index 16956772..00000000
--- a/test/Fixtures/lessjs (1.5)/css/colors.css	
+++ /dev/null
@@ -1,80 +0,0 @@
-#yelow #short {
-  color: #fea;
-}
-#yelow #long {
-  color: #ffeeaa;
-}
-#yelow #rgba {
-  color: rgba(255, 238, 170, 0.1);
-}
-#yelow #argb {
-  color: #1affeeaa;
-}
-#blue #short {
-  color: #00f;
-}
-#blue #long {
-  color: #0000ff;
-}
-#blue #rgba {
-  color: rgba(0, 0, 255, 0.1);
-}
-#blue #argb {
-  color: #1a0000ff;
-}
-#alpha #hsla {
-  color: rgba(61, 45, 41, 0.6);
-}
-#overflow .a {
-  color: #000000;
-}
-#overflow .b {
-  color: #ffffff;
-}
-#overflow .c {
-  color: #ffffff;
-}
-#overflow .d {
-  color: #00ff00;
-}
-#grey {
-  color: #c8c8c8;
-}
-#333333 {
-  color: #333333;
-}
-#808080 {
-  color: #808080;
-}
-#00ff00 {
-  color: #00ff00;
-}
-.lightenblue {
-  color: #3333ff;
-}
-.darkenblue {
-  color: #0000cc;
-}
-.unknowncolors {
-  color: blue2;
-  border: 2px solid superred;
-}
-.transparent {
-  color: transparent;
-  background-color: rgba(0, 0, 0, 0);
-}
-#alpha #fromvar {
-  opacity: 0.7;
-}
-#alpha #short {
-  opacity: 1;
-}
-#alpha #long {
-  opacity: 1;
-}
-#alpha #rgba {
-  opacity: 0.2;
-}
-#alpha #hsl {
-  opacity: 1;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/comments.css b/test/Fixtures/lessjs (1.5)/css/comments.css
deleted file mode 100644
index b85f5b4f..00000000
--- a/test/Fixtures/lessjs (1.5)/css/comments.css	
+++ /dev/null
@@ -1,69 +0,0 @@
-/******************\
-*                  *
-*  Comment Header  *
-*                  *
-\******************/
-/*
-
-    Comment
-
-*/
-/*
- * Comment Test
- *
- * - cloudhead (http://cloudhead.net)
- *
- */
-/* Colors
- * ------
- *   #EDF8FC (background blue)
- *   #166C89 (darkest blue)
- *
- * Text:
- *   #333 (standard text) // A comment within a comment!
- *   #1F9EC9 (standard link)
- *
- */
-/* @group Variables
-------------------- */
-#comments,
-.comments {
-  /**/
-  color: red;
-  /* A C-style comment */
-  /* A C-style comment */
-  background-color: orange;
-  font-size: 12px;
-  /* lost comment */
-  content: "content";
-  border: 1px solid black;
-  padding: 0;
-  margin: 2em;
-}
-/* commented out
-  #more-comments {
-    color: grey;
-  }
-*/
-.selector,
-.lots,
-.comments {
-  color: #808080, /* blue */ #ffa500;
-  -webkit-border-radius: 2px /* webkit only */;
-  -moz-border-radius: 8px /* moz only with operation */;
-}
-.test {
-  color: 1px;
-}
-#last {
-  color: #0000ff;
-}
-/*  */
-/* { */
-/*  */
-/*  */
-/*  */
-#div {
-  color: #A33;
-}
-/* } */
diff --git a/test/Fixtures/lessjs (1.5)/css/compression/compression.css b/test/Fixtures/lessjs (1.5)/css/compression/compression.css
deleted file mode 100644
index 8d6786e5..00000000
--- a/test/Fixtures/lessjs (1.5)/css/compression/compression.css	
+++ /dev/null
@@ -1,3 +0,0 @@
-#colours{color1:#fea;color2:#fea;color3:rgba(255,238,170,0.1);string:"#ffeeaa";/*! but not this type
-      Note preserved whitespace
-  */}dimensions{val:.1px;val:0;val:4cm;val:.2;val:5;angles-must-have-unit:0deg;durations-must-have-unit:0s;length-doesnt-have-unit:0;width:auto\9}@page{marks:none;@top-left-corner{vertical-align:top}@top-left{vertical-align:top}}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/css/css-3.css b/test/Fixtures/lessjs (1.5)/css/css-3.css
deleted file mode 100644
index 93b0a001..00000000
--- a/test/Fixtures/lessjs (1.5)/css/css-3.css	
+++ /dev/null
@@ -1,125 +0,0 @@
-.comma-delimited {
-  text-shadow: -1px -1px 1px #ff0000, 6px 5px 5px #ffff00;
-  -moz-box-shadow: 0pt 0pt 2px rgba(255, 255, 255, 0.4) inset, 0pt 4px 6px rgba(255, 255, 255, 0.4) inset;
-  -webkit-transform: rotate(-0.0000000001deg);
-}
-@font-face {
-  font-family: Headline;
-  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
-}
-.other {
-  -moz-transform: translate(0, 11em) rotate(-90deg);
-  transform: rotateX(45deg);
-}
-.item[data-cra_zy-attr1b-ut3=bold] {
-  font-weight: bold;
-}
-p:not([class*="lead"]) {
-  color: black;
-}
-input[type="text"].class#id[attr=32]:not(1) {
-  color: white;
-}
-div#id.class[a=1][b=2].class:not(1) {
-  color: white;
-}
-ul.comma > li:not(:only-child)::after {
-  color: white;
-}
-ol.comma > li:nth-last-child(2)::after {
-  color: white;
-}
-li:nth-child(4n+1),
-li:nth-child(-5n),
-li:nth-child(-n+2) {
-  color: white;
-}
-a[href^="http://"] {
-  color: black;
-}
-a[href$="http://"] {
-  color: black;
-}
-form[data-disabled] {
-  color: black;
-}
-p::before {
-  color: black;
-}
-#issue322 {
-  -webkit-animation: anim2 7s infinite ease-in-out;
-}
-@-webkit-keyframes frames {
-  0% {
-    border: 1px;
-  }
-  5.5% {
-    border: 2px;
-  }
-  100% {
-    border: 3px;
-  }
-}
-@keyframes fontbulger1 {
-  to {
-    font-size: 15px;
-  }
-  from,
-  to {
-    font-size: 12px;
-  }
-  0%,
-  100% {
-    font-size: 12px;
-  }
-}
-.units {
-  font: 1.2rem/2rem;
-  font: 8vw/9vw;
-  font: 10vh/12vh;
-  font: 12vm/15vm;
-  font: 12vmin/15vmin;
-  font: 1.2ch/1.5ch;
-}
-@supports ( box-shadow: 2px 2px 2px black ) or
-          ( -moz-box-shadow: 2px 2px 2px black ) {
-  .outline {
-    box-shadow: 2px 2px 2px black;
-    -moz-box-shadow: 2px 2px 2px black;
-  }
-}
-@-x-document url-prefix(""github.com"") {
-  h1 {
-    color: red;
-  }
-}
-@viewport {
-  font-size: 10px;
-}
-@namespace foo url(http://www.example.com);
-foo|h1 {
-  color: blue;
-}
-foo|* {
-  color: yellow;
-}
-|h1 {
-  color: red;
-}
-*|h1 {
-  color: green;
-}
-h1 {
-  color: green;
-}
-.upper-test {
-  UpperCaseProperties: allowed;
-}
-@host {
-  div {
-    display: block;
-  }
-}
-::distributed(input::placeholder) {
-  color: #b3b3b3;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/css-escapes.css b/test/Fixtures/lessjs (1.5)/css/css-escapes.css
deleted file mode 100644
index 4d343aa6..00000000
--- a/test/Fixtures/lessjs (1.5)/css/css-escapes.css	
+++ /dev/null
@@ -1,24 +0,0 @@
-.escape\|random\|char {
-  color: red;
-}
-.mixin\!tUp {
-  font-weight: bold;
-}
-.\34 04 {
-  background: red;
-}
-.\34 04 strong {
-  color: #ff00ff;
-  font-weight: bold;
-}
-.trailingTest\+ {
-  color: red;
-}
-/* This hideous test of hideousness checks for the selector "blockquote" with various permutations of hex escapes */
-\62\6c\6f \63 \6B \0071 \000075o\74 e {
-  color: silver;
-}
-[ng\:cloak],
-ng\:form {
-  display: none;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/css-guards.css b/test/Fixtures/lessjs (1.5)/css/css-guards.css
deleted file mode 100644
index dbb27dae..00000000
--- a/test/Fixtures/lessjs (1.5)/css/css-guards.css	
+++ /dev/null
@@ -1,18 +0,0 @@
-.light {
-  color: green;
-}
-.see-the {
-  color: orange;
-}
-.hide-the {
-  color: green;
-}
-.multiple-conditions-1 {
-  color: red;
-}
-.inheritance .test {
-  color: black;
-}
-.inheritance:hover {
-  color: pink;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/css.css b/test/Fixtures/lessjs (1.5)/css/css.css
deleted file mode 100644
index 41567d8d..00000000
--- a/test/Fixtures/lessjs (1.5)/css/css.css	
+++ /dev/null
@@ -1,95 +0,0 @@
-@charset "utf-8";
-div {
-  color: black;
-}
-div {
-  width: 99%;
-}
-* {
-  min-width: 45em;
-}
-h1,
-h2 > a > p,
-h3 {
-  color: none;
-}
-div.class {
-  color: blue;
-}
-div#id {
-  color: green;
-}
-.class#id {
-  color: purple;
-}
-.one.two.three {
-  color: grey;
-}
-@media print {
-  * {
-    font-size: 3em;
-  }
-}
-@media screen {
-  * {
-    font-size: 10px;
-  }
-}
-@font-face {
-  font-family: 'Garamond Pro';
-}
-a:hover,
-a:link {
-  color: #999;
-}
-p,
-p:first-child {
-  text-transform: none;
-}
-q:lang(no) {
-  quotes: none;
-}
-p + h1 {
-  font-size: 2.2em;
-}
-#shorthands {
-  border: 1px solid #000;
-  font: 12px/16px Arial;
-  font: 100%/16px Arial;
-  margin: 1px 0;
-  padding: 0 auto;
-}
-#more-shorthands {
-  margin: 0;
-  padding: 1px 0 2px 0;
-  font: normal small / 20px 'Trebuchet MS', Verdana, sans-serif;
-  font: 0/0 a;
-  border-radius: 0.5px;
-}
-.misc {
-  -moz-border-radius: 2px;
-  display: -moz-inline-stack;
-  width: .1em;
-  background-color: #009998;
-  background: -webkit-gradient(linear, left top, left bottom, from(#ff0000), to(#0000ff));
-  margin: ;
-  filter: alpha(opacity=100);
-  width: auto\9;
-}
-.misc .nested-multiple {
-  multiple-semi-colons: yes;
-}
-#important {
-  color: red !important;
-  width: 100%!important;
-  height: 20px ! important;
-}
-@font-face {
-  font-family: font-a;
-}
-@font-face {
-  font-family: font-b;
-}
-.æøå {
-  margin: 0;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-all.css b/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-all.css
deleted file mode 100644
index c6fb355b..00000000
--- a/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-all.css	
+++ /dev/null
@@ -1,43 +0,0 @@
-@charset "UTF-8";
-/* line 3, {pathimport}test.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000033}}
-/* @charset "ISO-8859-1"; */
-/* line 23, {pathimport}test.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000323}}
-.tst3 {
-  color: grey;
-}
-/* line 15, {path}linenumbers.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\0000315}}
-.test1 {
-  color: black;
-}
-/* line 6, {path}linenumbers.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\000036}}
-.test2 {
-  color: red;
-}
-@media all {
-  /* line 5, {pathimport}test.less */
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000035}}
-  .tst {
-    color: black;
-  }
-}
-@media all and screen {
-  /* line 7, {pathimport}test.less */
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000037}}
-  .tst {
-    color: red;
-  }
-  /* line 9, {pathimport}test.less */
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000039}}
-  .tst .tst3 {
-    color: white;
-  }
-}
-/* line 18, {pathimport}test.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000318}}
-.tst2 {
-  color: white;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-comments.css b/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-comments.css
deleted file mode 100644
index 9c48baa9..00000000
--- a/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-comments.css	
+++ /dev/null
@@ -1,35 +0,0 @@
-@charset "UTF-8";
-/* line 3, {pathimport}test.less */
-/* @charset "ISO-8859-1"; */
-/* line 23, {pathimport}test.less */
-.tst3 {
-  color: grey;
-}
-/* line 15, {path}linenumbers.less */
-.test1 {
-  color: black;
-}
-/* line 6, {path}linenumbers.less */
-.test2 {
-  color: red;
-}
-@media all {
-  /* line 5, {pathimport}test.less */
-  .tst {
-    color: black;
-  }
-}
-@media all and screen {
-  /* line 7, {pathimport}test.less */
-  .tst {
-    color: red;
-  }
-  /* line 9, {pathimport}test.less */
-  .tst .tst3 {
-    color: white;
-  }
-}
-/* line 18, {pathimport}test.less */
-.tst2 {
-  color: white;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-mediaquery.css b/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-mediaquery.css
deleted file mode 100644
index 3fdbbafc..00000000
--- a/test/Fixtures/lessjs (1.5)/css/debug/linenumbers-mediaquery.css	
+++ /dev/null
@@ -1,35 +0,0 @@
-@charset "UTF-8";
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000033}}
-/* @charset "ISO-8859-1"; */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000323}}
-.tst3 {
-  color: grey;
-}
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\0000315}}
-.test1 {
-  color: black;
-}
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\000036}}
-.test2 {
-  color: red;
-}
-@media all {
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000035}}
-  .tst {
-    color: black;
-  }
-}
-@media all and screen {
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000037}}
-  .tst {
-    color: red;
-  }
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000039}}
-  .tst .tst3 {
-    color: white;
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-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000318}}
-.tst2 {
-  color: white;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extend-chaining.css b/test/Fixtures/lessjs (1.5)/css/extend-chaining.css
deleted file mode 100644
index 820e134f..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extend-chaining.css	
+++ /dev/null
@@ -1,81 +0,0 @@
-.a,
-.b,
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-  color: black;
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-.f,
-.e,
-.d {
-  color: black;
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-  color: black;
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-  color: black;
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-  color: x;
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-.y,
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-  color: y;
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-.z,
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-  color: z;
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-.va,
-.vb,
-.vc {
-  color: black;
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-.vb,
-.vc {
-  color: white;
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-@media tv {
-  .ma,
-  .mb,
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-    color: black;
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-  .md,
-  .ma,
-  .mb,
-  .mc {
-    color: white;
-  }
-}
-@media tv and plasma {
-  .me,
-  .mf {
-    background: red;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extend-clearfix.css b/test/Fixtures/lessjs (1.5)/css/extend-clearfix.css
deleted file mode 100644
index 966892a2..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extend-clearfix.css	
+++ /dev/null
@@ -1,19 +0,0 @@
-.clearfix,
-.foo,
-.bar {
-  *zoom: 1;
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-.clearfix:after,
-.foo:after,
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-  content: '';
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-  color: red;
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-  color: blue;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extend-exact.css b/test/Fixtures/lessjs (1.5)/css/extend-exact.css
deleted file mode 100644
index beff4133..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extend-exact.css	
+++ /dev/null
@@ -1,37 +0,0 @@
-.replace.replace .replace,
-.c.replace + .replace .replace,
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-.c.replace + .replace .c,
-.rep_ace {
-  prop: copy-paste-replace;
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-  prop: is_effected;
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-.c .b .a,
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-.c .b .c,
-.a .b .c,
-.c .a .c,
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-  prop: not_effected;
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-.e.e,
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-  prop: extend-double;
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-  hover: not-extended;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extend-media.css b/test/Fixtures/lessjs (1.5)/css/extend-media.css
deleted file mode 100644
index 23bd7b85..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extend-media.css	
+++ /dev/null
@@ -1,24 +0,0 @@
-.ext1 .ext2,
-.all .ext2 {
-  background: black;
-}
-@media tv {
-  .ext1 .ext3,
-  .tv-lowres .ext3,
-  .all .ext3 {
-    color: white;
-  }
-  .tv-lowres {
-    background: blue;
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-@media tv and hires {
-  .ext1 .ext4,
-  .tv-hires .ext4,
-  .all .ext4 {
-    color: green;
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-  .tv-hires {
-    background: red;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extend-nest.css b/test/Fixtures/lessjs (1.5)/css/extend-nest.css
deleted file mode 100644
index 2c3905d9..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extend-nest.css	
+++ /dev/null
@@ -1,57 +0,0 @@
-.sidebar,
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-  width: 300px;
-  background: red;
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-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
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-  test: extended by masses of selectors;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extend-selector.css b/test/Fixtures/lessjs (1.5)/css/extend-selector.css
deleted file mode 100644
index da47254b..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extend-selector.css	
+++ /dev/null
@@ -1,80 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
-  background: #fdd;
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-.ext4 .bar,
-.ext4 .baz {
-  display: none;
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-div.ext5,
-.ext6 > .ext5,
-div.ext7,
-.ext6 > .ext7 {
-  width: 100px;
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-  prop: copy-paste-replace;
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-.attributes [data="test"],
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-  extend: attributes;
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-  extend: attributes2;
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-  extend: attributes2;
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-  background: red;
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-  background: blue;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extend.css b/test/Fixtures/lessjs (1.5)/css/extend.css
deleted file mode 100644
index 2895641a..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extend.css	
+++ /dev/null
@@ -1,76 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
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-  result: add-foo;
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-.ext8 + .ext9,
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-  result: bar-matched;
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-  background: red;
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-  color: black;
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diff --git a/test/Fixtures/lessjs (1.5)/css/extract-and-length.css b/test/Fixtures/lessjs (1.5)/css/extract-and-length.css
deleted file mode 100644
index f550e201..00000000
--- a/test/Fixtures/lessjs (1.5)/css/extract-and-length.css	
+++ /dev/null
@@ -1,133 +0,0 @@
-.multiunit {
-  length: 6;
-  extract: abc "abc" 1 1px 1% #112233;
-}
-.incorrect-index {
-  v1: extract(a b c, 5);
-  v2: extract(a, b, c, -2);
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-  var-value: variable;
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diff --git a/test/Fixtures/lessjs (1.5)/css/functions.css b/test/Fixtures/lessjs (1.5)/css/functions.css
deleted file mode 100644
index 24891512..00000000
--- a/test/Fixtures/lessjs (1.5)/css/functions.css	
+++ /dev/null
@@ -1,139 +0,0 @@
-#functions {
-  color: _color("evil red");
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-  height: undefined("self");
-  border-width: add(2, 3);
-  variable: increment(10);
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-  color: true;
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-  color3: true;
-  keyword: true;
-  number: true;
-  string: true;
-  pixel: true;
-  percent: true;
-  em: true;
-  cat: true;
-}
-#alpha {
-  alpha: rgba(153, 94, 51, 0.6);
-  alpha2: 0.5;
-  alpha3: 0;
-}
-#blendmodes {
-  multiply: #ed0000;
-  screen: #f600f6;
-  overlay: #ed0000;
-  softlight: #ff0000;
-  hardlight: #0000ed;
-  difference: #f600f6;
-  exclusion: #f600f6;
-  average: #7b007b;
-  negation: #d73131;
-}
-#extract-and-length {
-  extract: 3 2 1 C B A;
-  length: 6;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/ie-filters.css b/test/Fixtures/lessjs (1.5)/css/ie-filters.css
deleted file mode 100644
index 007aa536..00000000
--- a/test/Fixtures/lessjs (1.5)/css/ie-filters.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.nav {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=20);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0);
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#333333", endColorstr="#000000", GradientType=0);
-}
-.evalTest1 {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=30);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=5);
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/import-inline.css b/test/Fixtures/lessjs (1.5)/css/import-inline.css
deleted file mode 100644
index f198d3c1..00000000
--- a/test/Fixtures/lessjs (1.5)/css/import-inline.css	
+++ /dev/null
@@ -1,5 +0,0 @@
-this isn't very valid CSS.
-@media (min-width: 600px) {
-  #css { color: yellow; }
-
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/import-interpolation.css b/test/Fixtures/lessjs (1.5)/css/import-interpolation.css
deleted file mode 100644
index 16b7a150..00000000
--- a/test/Fixtures/lessjs (1.5)/css/import-interpolation.css	
+++ /dev/null
@@ -1,6 +0,0 @@
-body {
-  width: 100%;
-}
-.a {
-  var: test;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/import-once.css b/test/Fixtures/lessjs (1.5)/css/import-once.css
deleted file mode 100644
index 2f86b3b3..00000000
--- a/test/Fixtures/lessjs (1.5)/css/import-once.css	
+++ /dev/null
@@ -1,15 +0,0 @@
-#import {
-  color: #ff0000;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/import-reference.css b/test/Fixtures/lessjs (1.5)/css/import-reference.css
deleted file mode 100644
index c2d055a7..00000000
--- a/test/Fixtures/lessjs (1.5)/css/import-reference.css	
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
-  The media statement above is invalid (no selector)
-  We should ban invalid media queries with properties and no selector?
-*/
-.visible {
-  color: red;
-}
-.visible .c {
-  color: green;
-}
-.visible {
-  color: green;
-}
-.visible:hover {
-  color: green;
-}
-.visible {
-  color: green;
-}
-.only-with-visible + .visible,
-.visible + .only-with-visible,
-.visible + .visible {
-  color: green;
-}
-.only-with-visible + .visible .sub,
-.visible + .only-with-visible .sub,
-.visible + .visible .sub {
-  color: green;
-}
-.b {
-  color: red;
-  color: green;
-}
-.b .c {
-  color: green;
-}
-.b:hover {
-  color: green;
-}
-.b {
-  color: green;
-}
-.b + .b {
-  color: green;
-}
-.b + .b .sub {
-  color: green;
-}
-.y {
-  pulled-in: yes;
-}
-/* comment pulled in */
-.visible {
-  extend: test;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/import.css b/test/Fixtures/lessjs (1.5)/css/import.css
deleted file mode 100644
index a3749181..00000000
--- a/test/Fixtures/lessjs (1.5)/css/import.css	
+++ /dev/null
@@ -1,36 +0,0 @@
-@import url(http://fonts.googleapis.com/css?family=Open+Sans);
-@import url(/absolute/something.css) screen and (color) and (max-width: 600px);
-@import url("//ha.com/file.css") (min-width: 100px);
-#import-test {
-  height: 10px;
-  color: #ff0000;
-  width: 10px;
-  height: 30%;
-}
-@media screen and (max-width: 600px) {
-  body {
-    width: 100%;
-  }
-}
-#import {
-  color: #ff0000;
-}
-.mixin {
-  height: 10px;
-  color: #ff0000;
-}
-@media screen and (max-width: 601px) {
-  #css {
-    color: yellow;
-  }
-}
-@media screen and (max-width: 602px) {
-  body {
-    width: 100%;
-  }
-}
-@media screen and (max-width: 603px) {
-  #css {
-    color: yellow;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/javascript.css b/test/Fixtures/lessjs (1.5)/css/javascript.css
deleted file mode 100644
index 8268ab33..00000000
--- a/test/Fixtures/lessjs (1.5)/css/javascript.css	
+++ /dev/null
@@ -1,23 +0,0 @@
-.eval {
-  js: 42;
-  js: 2;
-  js: "hello world";
-  js: 1, 2, 3;
-  title: "string";
-  ternary: true;
-  multiline: 2;
-}
-.scope {
-  var: 42;
-  escaped: 7px;
-}
-.vars {
-  width: 8;
-}
-.escape-interpol {
-  width: hello world;
-}
-.arrays {
-  ary: "1, 2, 3";
-  ary1: "1, 2, 3";
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/lazy-eval.css b/test/Fixtures/lessjs (1.5)/css/lazy-eval.css
deleted file mode 100644
index 1adfb8f3..00000000
--- a/test/Fixtures/lessjs (1.5)/css/lazy-eval.css	
+++ /dev/null
@@ -1,3 +0,0 @@
-.lazy-eval {
-  width: 100%;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/legacy/legacy.css b/test/Fixtures/lessjs (1.5)/css/legacy/legacy.css
deleted file mode 100644
index 2f9bb80b..00000000
--- a/test/Fixtures/lessjs (1.5)/css/legacy/legacy.css	
+++ /dev/null
@@ -1,7 +0,0 @@
-@media (-o-min-device-pixel-ratio: 2/1) {
-  .test-math-and-units {
-    font: ignores 0/0 rules;
-    test-division: 7em;
-    simple: 2px;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/media.css b/test/Fixtures/lessjs (1.5)/css/media.css
deleted file mode 100644
index 607f0e44..00000000
--- a/test/Fixtures/lessjs (1.5)/css/media.css	
+++ /dev/null
@@ -1,219 +0,0 @@
-@media print {
-  .class {
-    color: blue;
-  }
-  .class .sub {
-    width: 42;
-  }
-  .top,
-  header > h1 {
-    color: #444444;
-  }
-}
-@media screen {
-  body {
-    max-width: 480;
-  }
-}
-@media all and (device-aspect-ratio: 16 / 9) {
-  body {
-    max-width: 800px;
-  }
-}
-@media all and (orientation: portrait) {
-  aside {
-    float: none;
-  }
-}
-@media handheld and (min-width: 42), screen and (min-width: 20em) {
-  body {
-    max-width: 480px;
-  }
-}
-@media print {
-  body {
-    padding: 20px;
-  }
-  body header {
-    background-color: red;
-  }
-}
-@media print and (orientation: landscape) {
-  body {
-    margin-left: 20px;
-  }
-}
-@media screen {
-  .sidebar {
-    width: 300px;
-  }
-}
-@media screen and (orientation: landscape) {
-  .sidebar {
-    width: 500px;
-  }
-}
-@media a and b {
-  .first .second .third {
-    width: 300px;
-  }
-  .first .second .fourth {
-    width: 3;
-  }
-}
-@media a and b and c {
-  .first .second .third {
-    width: 500px;
-  }
-}
-@media a, b and c {
-  body {
-    width: 95%;
-  }
-}
-@media a and x, b and c and x, a and y, b and c and y {
-  body {
-    width: 100%;
-  }
-}
-.a {
-  background: black;
-}
-@media handheld {
-  .a {
-    background: white;
-  }
-}
-@media handheld and (max-width: 100px) {
-  .a {
-    background: red;
-  }
-}
-.b {
-  background: black;
-}
-@media handheld {
-  .b {
-    background: white;
-  }
-}
-@media handheld and (max-width: 200px) {
-  .b {
-    background: red;
-  }
-}
-@media only screen and (max-width: 200px) {
-  body {
-    width: 480px;
-  }
-}
-@media print {
-  @page :left {
-    margin: 0.5cm;
-  }
-  @page :right {
-    margin: 0.5cm;
-  }
-  @page Test:first {
-    margin: 1cm;
-  }
-  @page :first {
-    size: 8.5in 11in;
-    
-    @top-left {
-      margin: 1cm;
-    }
-    @top-left-corner {
-      margin: 1cm;
-    }
-    @top-center {
-      margin: 1cm;
-    }
-    @top-right {
-      margin: 1cm;
-    }
-    @top-right-corner {
-      margin: 1cm;
-    }
-    @bottom-left {
-      margin: 1cm;
-    }
-    @bottom-left-corner {
-      margin: 1cm;
-    }
-    @bottom-center {
-      margin: 1cm;
-    }
-    @bottom-right {
-      margin: 1cm;
-    }
-    @bottom-right-corner {
-      margin: 1cm;
-    }
-    @left-top {
-      margin: 1cm;
-    }
-    @left-middle {
-      margin: 1cm;
-    }
-    @left-bottom {
-      margin: 1cm;
-    }
-    @right-top {
-      margin: 1cm;
-    }
-    @right-middle {
-      content: "Page " counter(page);
-    }
-    @right-bottom {
-      margin: 1cm;
-    }
-  }
-}
-@media (-webkit-min-device-pixel-ratio: 2), (min--moz-device-pixel-ratio: 2), (-o-min-device-pixel-ratio: 2/1), (min-resolution: 2dppx), (min-resolution: 128dpcm) {
-  .b {
-    background: red;
-  }
-}
-body {
-  background: red;
-}
-@media (max-width: 500px) {
-  body {
-    background: green;
-  }
-}
-@media (max-width: 1000px) {
-  body {
-    background: red;
-    background: blue;
-  }
-}
-@media (max-width: 1000px) and (max-width: 500px) {
-  body {
-    background: green;
-  }
-}
-@media (max-width: 1200px) {
-  /* a comment */
-}
-@media (max-width: 1200px) and (max-width: 900px) {
-  body {
-    font-size: 11px;
-  }
-}
-@media (min-width: 480px) {
-  .nav-justified > li {
-    display: table-cell;
-  }
-}
-@media (min-width: 768px) and (min-width: 480px) {
-  .menu > li {
-    display: table-cell;
-  }
-}
-@media all and tv {
-  .all-and-tv-variables {
-    var: all-and-tv;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/merge.css b/test/Fixtures/lessjs (1.5)/css/merge.css
deleted file mode 100644
index 4cf8c579..00000000
--- a/test/Fixtures/lessjs (1.5)/css/merge.css	
+++ /dev/null
@@ -1,22 +0,0 @@
-.test1 {
-  transform: rotate(90deg), skew(30deg), scale(2, 4);
-}
-.test2 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scaleX(45deg);
-}
-.test3 {
-  transform: scaleX(45deg);
-  background: url(data://img1.png);
-}
-.test4 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test5 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test6 {
-  transform: scale(2, 4);
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/mixins-args.css b/test/Fixtures/lessjs (1.5)/css/mixins-args.css
deleted file mode 100644
index 724613ad..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins-args.css	
+++ /dev/null
@@ -1,113 +0,0 @@
-#hidden {
-  color: transparent;
-}
-#hidden1 {
-  color: transparent;
-}
-.two-args {
-  color: blue;
-  width: 10px;
-  height: 99%;
-  border: 2px dotted #000000;
-}
-.one-arg {
-  width: 15px;
-  height: 49%;
-}
-.no-parens {
-  width: 5px;
-  height: 49%;
-}
-.no-args {
-  width: 5px;
-  height: 49%;
-}
-.var-args {
-  width: 45;
-  height: 17%;
-}
-.multi-mix {
-  width: 10px;
-  height: 29%;
-  margin: 4;
-  padding: 5;
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-body {
-  padding: 30px;
-  color: #ff0000;
-}
-.scope-mix {
-  width: 8;
-}
-.content {
-  width: 600px;
-}
-.content .column {
-  margin: 600px;
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-#same-var-name {
-  radius: 5px;
-}
-#var-inside {
-  width: 10px;
-}
-.arguments {
-  border: 1px solid #000000;
-  width: 1px;
-}
-.arguments2 {
-  border: 0px;
-  width: 0px;
-}
-.arguments3 {
-  border: 0px;
-  width: 0px;
-}
-.arguments4 {
-  border: 0 1 2 3 4;
-  rest: 1 2 3 4;
-  width: 0;
-}
-.edge-case {
-  border: "{";
-  width: "{";
-}
-.slash-vs-math {
-  border-radius: 0.4px;
-  border-radius: 0.5px;
-  border-radius: 6px;
-}
-.comma-vs-semi-colon {
-  one: a;
-  two: b, c;
-  one: d, e;
-  two: f;
-  one: g;
-  one: h;
-  one: i;
-  one: j;
-  one: k;
-  two: l;
-  one: m, n;
-  one: o, p;
-  two: q;
-  one: r, s;
-  two: t;
-}
-#named-conflict {
-  four: a, 11, 12, 13;
-  four: a, 21, 22, 23;
-}
-.test-mixin-default-arg {
-  defaults: 1px 1px 1px;
-  defaults: 2px 2px 2px;
-}
-.selector {
-  margin: 2, 2, 2, 2;
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-.selector2 {
-  margin: 2, 2, 2, 2;
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-.selector3 {
-  margin: 4;
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diff --git a/test/Fixtures/lessjs (1.5)/css/mixins-closure.css b/test/Fixtures/lessjs (1.5)/css/mixins-closure.css
deleted file mode 100644
index b1021b6f..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins-closure.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.class {
-  width: 99px;
-}
-.overwrite {
-  width: 99px;
-}
-.nested .class {
-  width: 5px;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/mixins-guards.css b/test/Fixtures/lessjs (1.5)/css/mixins-guards.css
deleted file mode 100644
index 25e6f287..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins-guards.css	
+++ /dev/null
@@ -1,82 +0,0 @@
-.light1 {
-  color: white;
-  margin: 1px;
-}
-.light2 {
-  color: black;
-  margin: 1px;
-}
-.max1 {
-  width: 6;
-}
-.max2 {
-  width: 8;
-}
-.glob1 {
-  margin: auto auto;
-}
-.ops1 {
-  height: gt-or-eq;
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-}
-.ops2 {
-  height: gt-or-eq;
-  height: not-eq;
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-.ops3 {
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-  height: not-eq;
-}
-.default1 {
-  content: default;
-}
-.test1 {
-  content: "true.";
-}
-.test2 {
-  content: "false.";
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-.test3 {
-  content: "false.";
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-.test4 {
-  content: "false.";
-}
-.test5 {
-  content: "false.";
-}
-.bool1 {
-  content: true and true;
-  content: true;
-  content: false, true;
-  content: false and true and true, true;
-  content: false, true and true;
-  content: false, false, true;
-  content: false, true and true and true, false;
-  content: not false;
-  content: not false and false, not false;
-}
-.equality-units {
-  test: pass;
-}
-.colorguardtest {
-  content: is #ff0000;
-  content: is not #0000ff its #ff0000;
-  content: is not #0000ff its #800080;
-}
-.stringguardtest {
-  content: is theme1;
-  content: is not theme2;
-  content: is theme1 no quotes;
-}
-#tryNumberPx {
-  catch: all;
-  declare: 4;
-  declare: 4px;
-}
-.call-lock-mixin .call-inner-lock-mixin {
-  a: 1;
-  x: 1;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/mixins-important.css b/test/Fixtures/lessjs (1.5)/css/mixins-important.css
deleted file mode 100644
index b100af7f..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins-important.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.class {
-  border: 1;
-  boxer: 1;
-  border-width: 1;
-  border: 2 !important;
-  boxer: 2 !important;
-  border-width: 2 !important;
-  border: 3;
-  boxer: 3;
-  border-width: 3;
-  border: 4 !important;
-  boxer: 4 !important;
-  border-width: 4 !important;
-  border: 5;
-  boxer: 5;
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-  border: 0 !important;
-  boxer: 0 !important;
-  border-width: 0 !important;
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-  boxer: 9;
-  border-width: 9;
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-.class .inner {
-  test: 1;
-}
-.class .inner {
-  test: 2 !important;
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-.class .inner {
-  test: 3;
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-.class .inner {
-  test: 4 !important;
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-.class .inner {
-  test: 5;
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-.class .inner {
-  test: 0 !important;
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-.class .inner {
-  test: 9;
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diff --git a/test/Fixtures/lessjs (1.5)/css/mixins-named-args.css b/test/Fixtures/lessjs (1.5)/css/mixins-named-args.css
deleted file mode 100644
index e460aa10..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins-named-args.css	
+++ /dev/null
@@ -1,27 +0,0 @@
-.named-arg {
-  color: blue;
-  width: 5px;
-  height: 99%;
-  args: 1px 100%;
-  text-align: center;
-}
-.class {
-  width: 5px;
-  height: 19%;
-  args: 1px 20%;
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-.all-args-wrong-args {
-  width: 10px;
-  height: 9%;
-  args: 2px 10%;
-}
-.named-args2 {
-  width: 15px;
-  height: 49%;
-  color: #646464;
-}
-.named-args3 {
-  width: 5px;
-  height: 29%;
-  color: #123456;
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diff --git a/test/Fixtures/lessjs (1.5)/css/mixins-nested.css b/test/Fixtures/lessjs (1.5)/css/mixins-nested.css
deleted file mode 100644
index 6378c475..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins-nested.css	
+++ /dev/null
@@ -1,14 +0,0 @@
-.class .inner {
-  height: 300;
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-.class .inner .innest {
-  width: 30;
-  border-width: 60;
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-.class2 .inner {
-  height: 600;
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-.class2 .inner .innest {
-  width: 60;
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diff --git a/test/Fixtures/lessjs (1.5)/css/mixins-pattern.css b/test/Fixtures/lessjs (1.5)/css/mixins-pattern.css
deleted file mode 100644
index 8b828335..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins-pattern.css	
+++ /dev/null
@@ -1,47 +0,0 @@
-.zero {
-  variadic: true;
-  zero: 0;
-  one: 1;
-  two: 2;
-  three: 3;
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-.one {
-  variadic: true;
-  one: 1;
-  one-req: 1;
-  two: 2;
-  three: 3;
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-.two {
-  variadic: true;
-  two: 2;
-  three: 3;
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-.three {
-  variadic: true;
-  three-req: 3;
-  three: 3;
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-.left {
-  left: 1;
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-.right {
-  right: 1;
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-.border-right {
-  color: black;
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-.border-left {
-  color: black;
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-.only-right {
-  right: 33;
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-.only-left {
-  left: 33;
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-.left-right {
-  both: 330;
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diff --git a/test/Fixtures/lessjs (1.5)/css/mixins.css b/test/Fixtures/lessjs (1.5)/css/mixins.css
deleted file mode 100644
index 32097f97..00000000
--- a/test/Fixtures/lessjs (1.5)/css/mixins.css	
+++ /dev/null
@@ -1,141 +0,0 @@
-.mixin {
-  border: 1px solid black;
-}
-.mixout {
-  border-color: orange;
-}
-.borders {
-  border-style: dashed;
-}
-#namespace .borders {
-  border-style: dotted;
-}
-#namespace .biohazard {
-  content: "death";
-}
-#namespace .biohazard .man {
-  color: transparent;
-}
-#theme > .mixin {
-  background-color: grey;
-}
-#container {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-#header .milk {
-  color: white;
-  border: 1px solid black;
-  background-color: grey;
-}
-#header #cookie {
-  border-style: dashed;
-}
-#header #cookie .chips {
-  border-style: dotted;
-}
-#header #cookie .chips .calories {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-.secure-zone {
-  color: transparent;
-}
-.direct {
-  border-style: dotted;
-}
-.bo,
-.bar {
-  width: 100%;
-}
-.bo {
-  border: 1px;
-}
-.ar.bo.ca {
-  color: black;
-}
-.jo.ki {
-  background: none;
-}
-.amp.support {
-  color: orange;
-}
-.amp.support .higher {
-  top: 0px;
-}
-.amp.support.deeper {
-  height: auto;
-}
-.extended {
-  width: 100%;
-  border: 1px;
-  background: none;
-  color: orange;
-  top: 0px;
-  height: auto;
-}
-.extended .higher {
-  top: 0px;
-}
-.extended.deeper {
-  height: auto;
-}
-.do .re .mi .fa .sol .la .si {
-  color: cyan;
-}
-.mutli-selector-parents {
-  color: cyan;
-}
-.foo .bar {
-  width: 100%;
-}
-.underParents {
-  color: red;
-}
-.parent .underParents {
-  color: red;
-}
-* + h1 {
-  margin-top: 25px;
-}
-legend + h1 {
-  margin-top: 0;
-}
-h1 + * {
-  margin-top: 10px;
-}
-* + h2 {
-  margin-top: 20px;
-}
-legend + h2 {
-  margin-top: 0;
-}
-h2 + * {
-  margin-top: 8px;
-}
-* + h3 {
-  margin-top: 15px;
-}
-legend + h3 {
-  margin-top: 0;
-}
-h3 + * {
-  margin-top: 5px;
-}
-.error {
-  background-image: "/a.png";
-  background-position: center center;
-}
-.test-rec .recursion {
-  color: black;
-}
-.button {
-  padding-left: 44px;
-}
-.button.large {
-  padding-left: 40em;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/no-output.css b/test/Fixtures/lessjs (1.5)/css/no-output.css
deleted file mode 100644
index e69de29b..00000000
diff --git a/test/Fixtures/lessjs (1.5)/css/operations.css b/test/Fixtures/lessjs (1.5)/css/operations.css
deleted file mode 100644
index fb9e0aff..00000000
--- a/test/Fixtures/lessjs (1.5)/css/operations.css	
+++ /dev/null
@@ -1,49 +0,0 @@
-#operations {
-  color: #111111;
-  height: 9px;
-  width: 3em;
-  substraction: 0;
-  division: 1;
-}
-#operations .spacing {
-  height: 9px;
-  width: 3em;
-}
-.with-variables {
-  height: 16em;
-  width: 24em;
-  size: 1cm;
-}
-.with-functions {
-  color: #646464;
-  color: #ff8080;
-  color: #c94a4a;
-}
-.negative {
-  height: 0px;
-  width: 4px;
-}
-.shorthands {
-  padding: -1px 2px 0 -4px;
-}
-.rem-dimensions {
-  font-size: 5.5rem;
-}
-.colors {
-  color: #123;
-  border-color: #334455;
-  background-color: #000000;
-}
-.colors .other {
-  color: #222222;
-  border-color: #222222;
-}
-.negations {
-  variable: -4px;
-  variable1: 0px;
-  variable2: 0px;
-  variable3: 8px;
-  variable4: 0px;
-  paren: -4px;
-  paren2: 16px;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/parens.css b/test/Fixtures/lessjs (1.5)/css/parens.css
deleted file mode 100644
index 015a4147..00000000
--- a/test/Fixtures/lessjs (1.5)/css/parens.css	
+++ /dev/null
@@ -1,33 +0,0 @@
-.parens {
-  border: 2px solid #000000;
-  margin: 1px 3px 16 3;
-  width: 36;
-  padding: 2px 36px;
-}
-.more-parens {
-  padding: 8 4 4 4px;
-  width-all: 96;
-  width-first: 96;
-  width-keep: 96;
-  height-keep: 113;
-  height-all: 113;
-  height-parts: 113;
-  margin-keep: 12;
-  margin-parts: 12;
-  margin-all: 12;
-  border-radius-keep: 5px;
-  border-radius-parts: 1.1428571428571428px;
-  border-radius-all: 5px;
-}
-.negative {
-  neg-var: -1;
-  neg-var-paren: -1;
-}
-.nested-parens {
-  width: 71;
-  height: 6;
-}
-.mixed-units {
-  margin: 2px 4em 1 5pc;
-  padding: 6px 1em 2px 2;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/rulesets.css b/test/Fixtures/lessjs (1.5)/css/rulesets.css
deleted file mode 100644
index 408c76aa..00000000
--- a/test/Fixtures/lessjs (1.5)/css/rulesets.css	
+++ /dev/null
@@ -1,33 +0,0 @@
-#first > .one {
-  font-size: 2em;
-}
-#first > .one > #second .two > #deux {
-  width: 50%;
-}
-#first > .one > #second .two > #deux #third {
-  height: 100%;
-}
-#first > .one > #second .two > #deux #third:focus {
-  color: black;
-}
-#first > .one > #second .two > #deux #third:focus #fifth > #sixth .seventh #eighth + #ninth {
-  color: purple;
-}
-#first > .one > #second .two > #deux #fourth,
-#first > .one > #second .two > #deux #five,
-#first > .one > #second .two > #deux #six {
-  color: #110000;
-}
-#first > .one > #second .two > #deux #fourth .seven,
-#first > .one > #second .two > #deux #five .seven,
-#first > .one > #second .two > #deux #six .seven,
-#first > .one > #second .two > #deux #fourth .eight > #nine,
-#first > .one > #second .two > #deux #five .eight > #nine,
-#first > .one > #second .two > #deux #six .eight > #nine {
-  border: 1px solid black;
-}
-#first > .one > #second .two > #deux #fourth #ten,
-#first > .one > #second .two > #deux #five #ten,
-#first > .one > #second .two > #deux #six #ten {
-  color: red;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/scope.css b/test/Fixtures/lessjs (1.5)/css/scope.css
deleted file mode 100644
index baa05523..00000000
--- a/test/Fixtures/lessjs (1.5)/css/scope.css	
+++ /dev/null
@@ -1,35 +0,0 @@
-.tiny-scope {
-  color: #998899;
-}
-.scope1 {
-  color: #0000ff;
-  border-color: #000000;
-}
-.scope1 .scope2 {
-  color: #0000ff;
-}
-.scope1 .scope2 .scope3 {
-  color: #ff0000;
-  border-color: #000000;
-  background-color: #ffffff;
-}
-.scope {
-  scoped-val: #008000;
-}
-.heightIsSet {
-  height: 1024px;
-}
-.useHeightInMixinCall {
-  mixin-height: 1024px;
-}
-.imported {
-  exists: true;
-}
-.testImported {
-  exists: true;
-}
-#allAreUsedHere {
-  default: 'top level';
-  scope: 'top level';
-  sub-scope-only: 'inside';
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/selectors.css b/test/Fixtures/lessjs (1.5)/css/selectors.css
deleted file mode 100644
index 51055047..00000000
--- a/test/Fixtures/lessjs (1.5)/css/selectors.css	
+++ /dev/null
@@ -1,142 +0,0 @@
-h1 a:hover,
-h2 a:hover,
-h3 a:hover,
-h1 p:hover,
-h2 p:hover,
-h3 p:hover {
-  color: red;
-}
-#all {
-  color: blue;
-}
-#the {
-  color: blue;
-}
-#same {
-  color: blue;
-}
-ul,
-li,
-div,
-q,
-blockquote,
-textarea {
-  margin: 0;
-}
-td {
-  margin: 0;
-  padding: 0;
-}
-td,
-input {
-  line-height: 1em;
-}
-a {
-  color: red;
-}
-a:hover {
-  color: blue;
-}
-div a {
-  color: green;
-}
-p a span {
-  color: yellow;
-}
-.foo .bar .qux,
-.foo .baz .qux {
-  display: block;
-}
-.qux .foo .bar,
-.qux .foo .baz {
-  display: inline;
-}
-.qux.foo .bar,
-.qux.foo .baz {
-  display: inline-block;
-}
-.qux .foo .bar .biz,
-.qux .foo .baz .biz {
-  display: none;
-}
-.a.b.c {
-  color: red;
-}
-.c .b.a {
-  color: red;
-}
-.foo .p.bar {
-  color: red;
-}
-.foo.p.bar {
-  color: red;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo,
-.foo + .bar,
-.bar + .foo,
-.bar + .bar {
-  background: amber;
-}
-.foo a > .foo a,
-.foo a > .bar a,
-.foo a > .foo b,
-.foo a > .bar b,
-.bar a > .foo a,
-.bar a > .bar a,
-.bar a > .foo b,
-.bar a > .bar b,
-.foo b > .foo a,
-.foo b > .bar a,
-.foo b > .foo b,
-.foo b > .bar b,
-.bar b > .foo a,
-.bar b > .bar a,
-.bar b > .foo b,
-.bar b > .bar b {
-  background: amber;
-}
-.other ::fnord {
-  color: #ff0000;
-}
-.other::fnord {
-  color: #ff0000;
-}
-.other ::bnord {
-  color: #ff0000;
-}
-.other::bnord {
-  color: #ff0000;
-}
-.blood {
-  color: red;
-}
-.bloodred {
-  color: green;
-}
-#blood.blood.red.black {
-  color: black;
-}
-:nth-child(3) {
-  selector: interpolated;
-}
-.test:nth-child(odd):not(:nth-child(3)) {
-  color: #ff0000;
-}
-[prop],
-[prop=10%],
-[prop="value3"],
-[prop*="val3"],
-[|prop~="val3"],
-[*|prop$="val3"],
-[ns|prop^="val3"],
-[3^="val3"],
-[3=3],
-[3] {
-  attributes: yes;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/static-urls/urls.css b/test/Fixtures/lessjs (1.5)/css/static-urls/urls.css
deleted file mode 100644
index 95f04fbb..00000000
--- a/test/Fixtures/lessjs (1.5)/css/static-urls/urls.css	
+++ /dev/null
@@ -1,41 +0,0 @@
-@import "css/background.css";
-@import "folder (1)/import-test-d.css";
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium), url(folder\ \(1\)/fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-}
-#misc {
-  background-image: url(folder\ \(1\)/images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-}
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-.comma-delimited {
-  background: url(folder\ \(1\)/bg.jpg) no-repeat, url(folder\ \(1\)/bg.png) repeat-x top left, url(folder\ \(1\)/bg);
-}
-.values {
-  url: url('folder (1)/Trebuchet');
-}
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('assets/logo.png');
-}
-@font-face {
-  font-family: xecret;
-  src: url('assets/xecret.ttf');
-}
-#secret {
-  font-family: xecret, sans-serif;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/strings.css b/test/Fixtures/lessjs (1.5)/css/strings.css
deleted file mode 100644
index cd6d6020..00000000
--- a/test/Fixtures/lessjs (1.5)/css/strings.css	
+++ /dev/null
@@ -1,43 +0,0 @@
-#strings {
-  background-image: url("http://son-of-a-banana.com");
-  quotes: "~" "~";
-  content: "#*%:&^,)!.(~*})";
-  empty: "";
-  brackets: "{" "}";
-  escapes: "\"hello\" \\world";
-  escapes2: "\"llo";
-}
-#comments {
-  content: "/* hello */ // not-so-secret";
-}
-#single-quote {
-  quotes: "'" "'";
-  content: '""#!&""';
-  empty: '';
-  semi-colon: ';';
-}
-#escaped {
-  filter: DX.Transform.MS.BS.filter(opacity=50);
-}
-#one-line {
-  image: url(http://tooks.com);
-}
-#crazy {
-  image: url(http://), "}", url("http://}");
-}
-#interpolation {
-  url: "http://lesscss.org/dev/image.jpg";
-  url2: "http://lesscss.org/image-256.jpg";
-  url3: "http://lesscss.org#445566";
-  url4: "http://lesscss.org/hello";
-  url5: "http://lesscss.org/54.4px";
-}
-.mix-mul-class {
-  color: #0000ff;
-  color: #ff0000;
-  color: #000000;
-  color: #ffa500;
-}
-.watermark {
-  family: Univers, Arial, Verdana, San-Serif;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/urls.css b/test/Fixtures/lessjs (1.5)/css/urls.css
deleted file mode 100644
index 492f5bc1..00000000
--- a/test/Fixtures/lessjs (1.5)/css/urls.css	
+++ /dev/null
@@ -1,63 +0,0 @@
-@import "css/background.css";
-@import "import/import-test-d.css";
-@import "file.css";
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium), url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-  background: url("img.jpg") center / 100px;
-  background: #ffffff url(image.png) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700");
-}
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-  url: url('Trebuchet');
-}
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('import/assets/logo.png');
-}
-@font-face {
-  font-family: xecret;
-  src: url('import/assets/xecret.ttf');
-}
-#secret {
-  font-family: xecret, sans-serif;
-}
-#data-uri {
-  uri: url('data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==');
-}
-#data-uri-guess {
-  uri: url('data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==');
-}
-#data-uri-ascii {
-  uri-1: url('data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A');
-  uri-2: url('data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A');
-}
-#data-uri-toobig {
-  uri: url('../data/data-uri-fail.png');
-}
-#svg-functions {
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/variables.css b/test/Fixtures/lessjs (1.5)/css/variables.css
deleted file mode 100644
index f8d8518b..00000000
--- a/test/Fixtures/lessjs (1.5)/css/variables.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.variables {
-  width: 14cm;
-}
-.variables {
-  height: 24px;
-  color: #888888;
-  font-family: "Trebuchet MS", Verdana, sans-serif;
-  quotes: "~" "~";
-}
-.redef {
-  zero: 0;
-}
-.redef .inition {
-  three: 3;
-}
-.values {
-  minus-one: -1;
-  font-family: 'Trebuchet', 'Trebuchet', 'Trebuchet';
-  color: #888888 !important;
-  multi: something 'A', B, C, 'Trebuchet';
-}
-.variable-names {
-  name: 'hello';
-}
-.alpha {
-  filter: alpha(opacity=42);
-}
-.testPollution {
-  a: 'no-pollution';
-}
-.units {
-  width: 1px;
-  same-unit-as-previously: 1px;
-  square-pixel-divided: 1px;
-  odd-unit: 2;
-  percentage: 500%;
-  pixels: 500px;
-  conversion-metric-a: 30mm;
-  conversion-metric-b: 3cm;
-  conversion-imperial: 3in;
-  custom-unit: 420octocats;
-  custom-unit-cancelling: 18dogs;
-  mix-units: 2px;
-  invalid-units: 1px;
-}
diff --git a/test/Fixtures/lessjs (1.5)/css/whitespace.css b/test/Fixtures/lessjs (1.5)/css/whitespace.css
deleted file mode 100644
index 74c9b65e..00000000
--- a/test/Fixtures/lessjs (1.5)/css/whitespace.css	
+++ /dev/null
@@ -1,42 +0,0 @@
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white ;
-}
-.white,
-.space,
-.mania {
-  color: white;
-}
-.no-semi-column {
-  color: #ffffff;
-}
-.no-semi-column {
-  color: white;
-  white-space: pre;
-}
-.no-semi-column {
-  border: 2px solid #ffffff;
-}
-.newlines {
-  background: the,
-              great,
-              wall;
-  border: 2px
-          solid
-          black;
-}
-.sel .newline_ws .tab_ws {
-  color: white;
-  background-position: 45 -23;
-}
diff --git a/test/Fixtures/lessjs (1.5)/data/data-uri-fail.png b/test/Fixtures/lessjs (1.5)/data/data-uri-fail.png
deleted file mode 100644
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diff --git a/test/Fixtures/lessjs (1.5)/data/image.jpg b/test/Fixtures/lessjs (1.5)/data/image.jpg
deleted file mode 100644
index 83f77790..00000000
--- a/test/Fixtures/lessjs (1.5)/data/image.jpg	
+++ /dev/null
@@ -1 +0,0 @@
-not actually a jpeg file
diff --git a/test/Fixtures/lessjs (1.5)/data/page.html b/test/Fixtures/lessjs (1.5)/data/page.html
deleted file mode 100644
index ccdfe565..00000000
--- a/test/Fixtures/lessjs (1.5)/data/page.html	
+++ /dev/null
@@ -1 +0,0 @@
-<h1>This page is 100% Awesome.</h1>
diff --git a/test/Fixtures/lessjs (1.5)/expected/a.css b/test/Fixtures/lessjs (1.5)/expected/a.css
deleted file mode 100644
index a45a62e9..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/a.css	
+++ /dev/null
@@ -1,13 +0,0 @@
-.mixin {
-  width: 10;
-  height: 20;
-  color: red !important;
-  background: #000;
-}
-.test {
-  width: 10;
-  height: 20;
-  color: red !important;
-  background: #000;
-  color: blue;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/charsets.css b/test/Fixtures/lessjs (1.5)/expected/charsets.css
deleted file mode 100644
index 9f44090c..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/charsets.css	
+++ /dev/null
@@ -1 +0,0 @@
-@charset "UTF-8";
diff --git a/test/Fixtures/lessjs (1.5)/expected/colors.css b/test/Fixtures/lessjs (1.5)/expected/colors.css
deleted file mode 100644
index 16956772..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/colors.css	
+++ /dev/null
@@ -1,80 +0,0 @@
-#yelow #short {
-  color: #fea;
-}
-#yelow #long {
-  color: #ffeeaa;
-}
-#yelow #rgba {
-  color: rgba(255, 238, 170, 0.1);
-}
-#yelow #argb {
-  color: #1affeeaa;
-}
-#blue #short {
-  color: #00f;
-}
-#blue #long {
-  color: #0000ff;
-}
-#blue #rgba {
-  color: rgba(0, 0, 255, 0.1);
-}
-#blue #argb {
-  color: #1a0000ff;
-}
-#alpha #hsla {
-  color: rgba(61, 45, 41, 0.6);
-}
-#overflow .a {
-  color: #000000;
-}
-#overflow .b {
-  color: #ffffff;
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-#overflow .c {
-  color: #ffffff;
-}
-#overflow .d {
-  color: #00ff00;
-}
-#grey {
-  color: #c8c8c8;
-}
-#333333 {
-  color: #333333;
-}
-#808080 {
-  color: #808080;
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-#00ff00 {
-  color: #00ff00;
-}
-.lightenblue {
-  color: #3333ff;
-}
-.darkenblue {
-  color: #0000cc;
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-.unknowncolors {
-  color: blue2;
-  border: 2px solid superred;
-}
-.transparent {
-  color: transparent;
-  background-color: rgba(0, 0, 0, 0);
-}
-#alpha #fromvar {
-  opacity: 0.7;
-}
-#alpha #short {
-  opacity: 1;
-}
-#alpha #long {
-  opacity: 1;
-}
-#alpha #rgba {
-  opacity: 0.2;
-}
-#alpha #hsl {
-  opacity: 1;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/comments.css b/test/Fixtures/lessjs (1.5)/expected/comments.css
deleted file mode 100644
index b7670230..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/comments.css	
+++ /dev/null
@@ -1,69 +0,0 @@
-/******************\
-*                  *
-*  Comment Header  *
-*                  *
-\******************/
-/*
-
-    Comment
-
-*/
-/*
- * Comment Test
- *
- * - cloudhead (http://cloudhead.net)
- *
- */
-/* Colors
- * ------
- *   #EDF8FC (background blue)
- *   #166C89 (darkest blue)
- *
- * Text:
- *   #333 (standard text) // A comment within a comment!
- *   #1F9EC9 (standard link)
- *
- */
-/* @group Variables
-------------------- */
-#comments,
-.comments {
-  /**/
-  color: red;
-  /* A C-style comment */
-  /* A C-style comment */
-  background-color: orange;
-  font-size: 12px;
-  /* lost comment */
-  content: "content";
-  border: 1px solid black;
-  padding: 0;
-  margin: 2em;
-}
-/* commented out
-  #more-comments {
-    color: grey;
-  }
-*/
-.selector,
-.lots,
-.comments {
-  color: #808080, /* blue */ #ffa500;
-  -webkit-border-radius: 2px /* webkit only */;
-  -moz-border-radius: 8px /* moz only with operation */;
-}
-.test {
-  color: 1px;
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-#last {
-  color: blue;
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-/*  */
-/* { */
-/*  */
-/*  */
-/*  */
-#div {
-  color: #A33;
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-/* } */
diff --git a/test/Fixtures/lessjs (1.5)/expected/css-3.css b/test/Fixtures/lessjs (1.5)/expected/css-3.css
deleted file mode 100644
index 93b0a001..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/css-3.css	
+++ /dev/null
@@ -1,125 +0,0 @@
-.comma-delimited {
-  text-shadow: -1px -1px 1px #ff0000, 6px 5px 5px #ffff00;
-  -moz-box-shadow: 0pt 0pt 2px rgba(255, 255, 255, 0.4) inset, 0pt 4px 6px rgba(255, 255, 255, 0.4) inset;
-  -webkit-transform: rotate(-0.0000000001deg);
-}
-@font-face {
-  font-family: Headline;
-  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
-}
-.other {
-  -moz-transform: translate(0, 11em) rotate(-90deg);
-  transform: rotateX(45deg);
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-.item[data-cra_zy-attr1b-ut3=bold] {
-  font-weight: bold;
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-p:not([class*="lead"]) {
-  color: black;
-}
-input[type="text"].class#id[attr=32]:not(1) {
-  color: white;
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-div#id.class[a=1][b=2].class:not(1) {
-  color: white;
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-ul.comma > li:not(:only-child)::after {
-  color: white;
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-ol.comma > li:nth-last-child(2)::after {
-  color: white;
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-li:nth-child(4n+1),
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-li:nth-child(-n+2) {
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-  color: black;
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-  color: black;
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-  color: black;
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-p::before {
-  color: black;
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-#issue322 {
-  -webkit-animation: anim2 7s infinite ease-in-out;
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-@-webkit-keyframes frames {
-  0% {
-    border: 1px;
-  }
-  5.5% {
-    border: 2px;
-  }
-  100% {
-    border: 3px;
-  }
-}
-@keyframes fontbulger1 {
-  to {
-    font-size: 15px;
-  }
-  from,
-  to {
-    font-size: 12px;
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-  0%,
-  100% {
-    font-size: 12px;
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-.units {
-  font: 1.2rem/2rem;
-  font: 8vw/9vw;
-  font: 10vh/12vh;
-  font: 12vm/15vm;
-  font: 12vmin/15vmin;
-  font: 1.2ch/1.5ch;
-}
-@supports ( box-shadow: 2px 2px 2px black ) or
-          ( -moz-box-shadow: 2px 2px 2px black ) {
-  .outline {
-    box-shadow: 2px 2px 2px black;
-    -moz-box-shadow: 2px 2px 2px black;
-  }
-}
-@-x-document url-prefix(""github.com"") {
-  h1 {
-    color: red;
-  }
-}
-@viewport {
-  font-size: 10px;
-}
-@namespace foo url(http://www.example.com);
-foo|h1 {
-  color: blue;
-}
-foo|* {
-  color: yellow;
-}
-|h1 {
-  color: red;
-}
-*|h1 {
-  color: green;
-}
-h1 {
-  color: green;
-}
-.upper-test {
-  UpperCaseProperties: allowed;
-}
-@host {
-  div {
-    display: block;
-  }
-}
-::distributed(input::placeholder) {
-  color: #b3b3b3;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/css-escapes.css b/test/Fixtures/lessjs (1.5)/expected/css-escapes.css
deleted file mode 100644
index 4d343aa6..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/css-escapes.css	
+++ /dev/null
@@ -1,24 +0,0 @@
-.escape\|random\|char {
-  color: red;
-}
-.mixin\!tUp {
-  font-weight: bold;
-}
-.\34 04 {
-  background: red;
-}
-.\34 04 strong {
-  color: #ff00ff;
-  font-weight: bold;
-}
-.trailingTest\+ {
-  color: red;
-}
-/* This hideous test of hideousness checks for the selector "blockquote" with various permutations of hex escapes */
-\62\6c\6f \63 \6B \0071 \000075o\74 e {
-  color: silver;
-}
-[ng\:cloak],
-ng\:form {
-  display: none;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/css-guards.css b/test/Fixtures/lessjs (1.5)/expected/css-guards.css
deleted file mode 100644
index dbb27dae..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/css-guards.css	
+++ /dev/null
@@ -1,18 +0,0 @@
-.light {
-  color: green;
-}
-.see-the {
-  color: orange;
-}
-.hide-the {
-  color: green;
-}
-.multiple-conditions-1 {
-  color: red;
-}
-.inheritance .test {
-  color: black;
-}
-.inheritance:hover {
-  color: pink;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/css.css b/test/Fixtures/lessjs (1.5)/expected/css.css
deleted file mode 100644
index 24040ff3..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/css.css	
+++ /dev/null
@@ -1,95 +0,0 @@
-@charset "utf-8";
-div {
-  color: black;
-}
-div {
-  width: 99%;
-}
-* {
-  min-width: 45em;
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-h1,
-h2 > a > p,
-h3 {
-  color: none;
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-div.class {
-  color: blue;
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-div#id {
-  color: green;
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-.class#id {
-  color: purple;
-}
-.one.two.three {
-  color: grey;
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-@media print {
-  * {
-    font-size: 3em;
-  }
-}
-@media screen {
-  * {
-    font-size: 10px;
-  }
-}
-@font-face {
-  font-family: 'Garamond Pro';
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-a:hover,
-a:link {
-  color: #999;
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-p,
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-  text-transform: none;
-}
-q:lang(no) {
-  quotes: none;
-}
-p + h1 {
-  font-size: 2.2em;
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-#shorthands {
-  border: 1px solid #000;
-  font: 12px/16px Arial;
-  font: 100%/16px Arial;
-  margin: 1px 0;
-  padding: 0 auto;
-}
-#more-shorthands {
-  margin: 0;
-  padding: 1px 0 2px 0;
-  font: normal small / 20px 'Trebuchet MS', Verdana, sans-serif;
-  font: 0/0 a;
-  border-radius: 0.5px;
-}
-.misc {
-  -moz-border-radius: 2px;
-  display: -moz-inline-stack;
-  width: .1em;
-  background-color: #009998;
-  background: -webkit-gradient(linear, left top, left bottom, from(#ff0000), to(#0000ff));
-  margin: ;
-  filter: alpha(opacity=100);
-  width: auto\9;
-}
-.misc .nested-multiple {
-  multiple-semi-colons: yes;
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-#important {
-  color: red !important;
-  width: 100% !important;
-  height: 20px !important;
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-@font-face {
-  font-family: font-a;
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-@font-face {
-  font-family: font-b;
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-.æøå {
-  margin: 0;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/extend-chaining.css b/test/Fixtures/lessjs (1.5)/expected/extend-chaining.css
deleted file mode 100644
index 820e134f..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extend-chaining.css	
+++ /dev/null
@@ -1,81 +0,0 @@
-.a,
-.b,
-.c {
-  color: black;
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-.f,
-.e,
-.d {
-  color: black;
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-.g.h,
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-.k.j.h {
-  color: black;
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-.i.j,
-.k.j {
-  color: white;
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-.l,
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-.w,
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-  color: black;
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-.x,
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-  color: x;
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-.y,
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-.x {
-  color: y;
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-.z,
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-  color: z;
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-.va,
-.vb,
-.vc {
-  color: black;
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-.vb,
-.vc {
-  color: white;
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-  .md,
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-    color: white;
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-@media tv and plasma {
-  .me,
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diff --git a/test/Fixtures/lessjs (1.5)/expected/extend-clearfix.css b/test/Fixtures/lessjs (1.5)/expected/extend-clearfix.css
deleted file mode 100644
index 966892a2..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extend-clearfix.css	
+++ /dev/null
@@ -1,19 +0,0 @@
-.clearfix,
-.foo,
-.bar {
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-.clearfix:after,
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-  color: red;
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-  color: blue;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/extend-exact.css b/test/Fixtures/lessjs (1.5)/expected/extend-exact.css
deleted file mode 100644
index beff4133..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extend-exact.css	
+++ /dev/null
@@ -1,37 +0,0 @@
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-.c.replace + .replace .c,
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diff --git a/test/Fixtures/lessjs (1.5)/expected/extend-media.css b/test/Fixtures/lessjs (1.5)/expected/extend-media.css
deleted file mode 100644
index 23bd7b85..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extend-media.css	
+++ /dev/null
@@ -1,24 +0,0 @@
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-  .tv-lowres {
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-@media tv and hires {
-  .ext1 .ext4,
-  .tv-hires .ext4,
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-    color: green;
-  }
-  .tv-hires {
-    background: red;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/extend-nest.css b/test/Fixtures/lessjs (1.5)/expected/extend-nest.css
deleted file mode 100644
index 2c3905d9..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extend-nest.css	
+++ /dev/null
@@ -1,57 +0,0 @@
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-.type2.sidebar4 {
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-.button:hover,
-.submit:hover {
-  color: white;
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-.button2 :hover {
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-.button2 :hover {
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-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g {
-  test: extended by masses of selectors;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/extend-selector.css b/test/Fixtures/lessjs (1.5)/expected/extend-selector.css
deleted file mode 100644
index da47254b..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extend-selector.css	
+++ /dev/null
@@ -1,80 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion,
-.badError.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error,
-.intrusion .badError {
-  display: none;
-}
-.badError {
-  border-width: 3px;
-}
-.foo .bar,
-.foo .baz,
-.ext1 .ext2 .bar,
-.ext1 .ext2 .baz,
-.ext3 .bar,
-.ext3 .baz,
-.ext4 .bar,
-.ext4 .baz {
-  display: none;
-}
-div.ext5,
-.ext6 > .ext5,
-div.ext7,
-.ext6 > .ext7 {
-  width: 100px;
-}
-.ext,
-.a .c,
-.b .c {
-  test: 1;
-}
-.a,
-.b {
-  test: 2;
-}
-.a .c,
-.b .c {
-  test: 3;
-}
-.a .c .d,
-.b .c .d {
-  test: 4;
-}
-.replace.replace .replace,
-.c.replace + .replace .replace,
-.replace.replace .c,
-.c.replace + .replace .c,
-.rep_ace.rep_ace .rep_ace,
-.c.rep_ace + .rep_ace .rep_ace,
-.rep_ace.rep_ace .c,
-.c.rep_ace + .rep_ace .c {
-  prop: copy-paste-replace;
-}
-.attributes [data="test"],
-.attributes .attributes .attribute-test {
-  extend: attributes;
-}
-.attributes [data],
-.attributes .attributes .attribute-test2 {
-  extend: attributes2;
-}
-.attributes [data="test3"],
-.attributes .attributes .attribute-test {
-  extend: attributes2;
-}
-.header .header-nav,
-.footer .footer-nav {
-  background: red;
-}
-.header .header-nav:before,
-.footer .footer-nav:before {
-  background: blue;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/extend.css b/test/Fixtures/lessjs (1.5)/expected/extend.css
deleted file mode 100644
index 2895641a..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extend.css	
+++ /dev/null
@@ -1,76 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion,
-.badError.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error,
-.intrusion .badError {
-  display: none;
-}
-.badError {
-  border-width: 3px;
-}
-.foo .bar,
-.foo .baz,
-.ext1 .ext2 .bar,
-.ext1 .ext2 .baz,
-.ext3 .bar,
-.ext3 .baz,
-.foo .ext3,
-.ext4 .bar,
-.ext4 .baz,
-.foo .ext4 {
-  display: none;
-}
-div.ext5,
-.ext6 > .ext5,
-div.ext7,
-.ext6 > .ext7 {
-  width: 100px;
-}
-.ext8.ext9,
-.fuu {
-  result: add-foo;
-}
-.ext8 .ext9,
-.ext8 + .ext9,
-.ext8 > .ext9,
-.buu,
-.zap,
-.zoo {
-  result: bar-matched;
-}
-.ext8.nomatch {
-  result: none;
-}
-.ext8 .ext9,
-.buu {
-  result: match-nested-bar;
-}
-.ext8.ext9,
-.fuu {
-  result: match-nested-foo;
-}
-.aa,
-.cc {
-  color: black;
-}
-.aa .dd,
-.aa .ee {
-  background: red;
-}
-.bb,
-.cc,
-.ee,
-.ff {
-  background: red;
-}
-.bb .bb,
-.ff .ff {
-  color: black;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/extract-and-length.css b/test/Fixtures/lessjs (1.5)/expected/extract-and-length.css
deleted file mode 100644
index f550e201..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/extract-and-length.css	
+++ /dev/null
@@ -1,133 +0,0 @@
-.multiunit {
-  length: 6;
-  extract: abc "abc" 1 1px 1% #112233;
-}
-.incorrect-index {
-  v1: extract(a b c, 5);
-  v2: extract(a, b, c, -2);
-}
-.scalar {
-  var-value: variable;
-  var-length: 1;
-  ill-index: extract(variable, 2);
-  name-value: name;
-  string-value: "string";
-  number-value: 12345678;
-  color-value: #0000ff;
-  rgba-value: rgba(80, 160, 240, 0.67);
-  empty-value: ;
-  name-length: 1;
-  string-length: 1;
-  number-length: 1;
-  color-length: 1;
-  rgba-length: 1;
-  empty-length: 1;
-}
-.mixin-arguments-1 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-4 {
-  length: 0;
-  extract: extract(, 2) | extract(, 1);
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-4 {
-  length: 3;
-  extract: c | b;
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: 3 | 2 | 1;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: 3 | 2 | 1;
-}
-.mixin-arguments-4 {
-  length: 3;
-  extract: 3 | 2;
-}
-.md-space-comma {
-  length-1: 3;
-  extract-1: 1 2 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-space-comma-as-args-2 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-space-comma-as-args-3 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-space-comma-as-args-4 {
-  length: 2;
-  extract: "x" "y" "z" | 1 2 3;
-}
-.md-cat-space-comma {
-  length-1: 3;
-  extract-1: 1 2 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-cat-space-comma-as-args-2 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-cat-space-comma-as-args-3 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-cat-space-comma-as-args-4 {
-  length: 2;
-  extract: "x" "y" "z" | 1 2 3;
-}
-.md-cat-comma-space {
-  length-1: 3;
-  extract-1: 1, 2, 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-cat-comma-space-as-args-1 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-2 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-3 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-4 {
-  length: 0;
-  extract: extract(, 2) | extract(, 1);
-}
-.md-3D {
-  length-1: 2;
-  extract-1: a b c d, 1 2 3 4;
-  length-2: 2;
-  extract-2: 5 6 7 8;
-  length-3: 4;
-  extract-3: 7;
-  length-4: 1;
-  extract-4: 8;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/functions.css b/test/Fixtures/lessjs (1.5)/expected/functions.css
deleted file mode 100644
index 3d24d3d9..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/functions.css	
+++ /dev/null
@@ -1,139 +0,0 @@
-#functions {
-  color: _color("evil red");
-  width: increment(15);
-  height: undefined("self");
-  border-width: add(2, 3);
-  variable: increment(10);
-  background: linear-gradient(#000000, #ffffff);
-}
-#built-in {
-  escaped: -Some::weird(#thing, y);
-  lighten: #ffcccc;
-  darken: #330000;
-  saturate: #203c31;
-  desaturate: #29332f;
-  greyscale: #2e2e2e;
-  hsl-clamp: #ffffff;
-  spin-p: #bf6a40;
-  spin-n: #bf4055;
-  luma-white: 100%;
-  luma-black: 0%;
-  luma-black-alpha: 0%;
-  luma-red: 21%;
-  luma-green: 72%;
-  luma-blue: 7%;
-  luma-yellow: 93%;
-  luma-cyan: 79%;
-  luma-white-alpha: 50%;
-  contrast-filter: contrast(30%);
-  saturate-filter: saturate(5%);
-  contrast-white: #000000;
-  contrast-black: #ffffff;
-  contrast-red: #ffffff;
-  contrast-green: #000000;
-  contrast-blue: #ffffff;
-  contrast-yellow: #000000;
-  contrast-cyan: #000000;
-  contrast-light: #111111;
-  contrast-dark: #eeeeee;
-  contrast-wrongorder: #111111;
-  contrast-light-thresh: #111111;
-  contrast-dark-thresh: #eeeeee;
-  contrast-high-thresh: #eeeeee;
-  contrast-low-thresh: #111111;
-  contrast-light-thresh-per: #111111;
-  contrast-dark-thresh-per: #eeeeee;
-  contrast-high-thresh-per: #eeeeee;
-  contrast-low-thresh-per: #111111;
-  format: "rgb(32, 128, 64)";
-  format-string: "hello world";
-  format-multiple: "hello earth 2";
-  format-url-encode: "red is %23ff0000";
-  eformat: rgb(32, 128, 64);
-  unitless: 12;
-  unit: 14em;
-  hue: 98;
-  saturation: 12%;
-  lightness: 95%;
-  hsvhue: 98;
-  hsvsaturation: 12%;
-  hsvvalue: 95%;
-  red: 255;
-  green: 255;
-  blue: 255;
-  rounded: 11;
-  rounded-two: 10.67;
-  roundedpx: 3px;
-  roundedpx-three: 3.333px;
-  rounded-percentage: 10%;
-  ceil: 11px;
-  floor: 12px;
-  sqrt: 5px;
-  pi: 3.141592653589793;
-  mod: 2m;
-  abs: 4%;
-  tan: 0.9004041504844098;
-  sin: 0.1736481914174355;
-  cos: 0.8438539587324921;
-  atan: 0.1rad;
-  atan: 34deg;
-  atan: 44.99999640000029deg;
-  pow: 64px;
-  pow: 64;
-  pow: 27;
-  min: 0;
-  min: min("junk", 5);
-  min: 3pt;
-  max: 3;
-  max: max(8%, 1cm);
-  percentage: 20%;
-  color: #ff0011;
-  tint: #898989;
-  tint-full: #ffffff;
-  tint-percent: #898989;
-  shade: #686868;
-  shade-full: #000000;
-  shade-percent: #686868;
-  fade-out: rgba(255, 0, 0, 0.95);
-  fade-in: rgba(255, 0, 0, 0.9500000000000001);
-  hsv: #4d2926;
-  hsva: rgba(77, 40, 38, 0.2);
-  mix: #ff3300;
-  mix-0: #ffff00;
-  mix-100: #ff0000;
-  mix-weightless: #ff8000;
-  mixt: rgba(255, 0, 0, 0.5);
-}
-#built-in .is-a {
-  color: true;
-  color1: true;
-  color2: true;
-  color3: true;
-  keyword: true;
-  number: true;
-  string: true;
-  pixel: true;
-  percent: true;
-  em: true;
-  cat: true;
-}
-#alpha {
-  alpha: rgba(153, 94, 51, 0.6);
-  alpha2: 0.5;
-  alpha3: 0;
-}
-#blendmodes {
-  multiply: #ed0000;
-  screen: #f600f6;
-  overlay: #ed0000;
-  softlight: #fa0000;
-  hardlight: #0000ed;
-  difference: #f600f6;
-  exclusion: #f600f6;
-  average: #7b007b;
-  negation: #d73131;
-}
-#extract-and-length {
-  extract: 3 2 1 C B A;
-  length: 6;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/ie-filters.css b/test/Fixtures/lessjs (1.5)/expected/ie-filters.css
deleted file mode 100644
index 007aa536..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/ie-filters.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.nav {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=20);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0);
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#333333", endColorstr="#000000", GradientType=0);
-}
-.evalTest1 {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=30);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=5);
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/import-inline.css b/test/Fixtures/lessjs (1.5)/expected/import-inline.css
deleted file mode 100644
index f198d3c1..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/import-inline.css	
+++ /dev/null
@@ -1,5 +0,0 @@
-this isn't very valid CSS.
-@media (min-width: 600px) {
-  #css { color: yellow; }
-
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/import-interpolation.css b/test/Fixtures/lessjs (1.5)/expected/import-interpolation.css
deleted file mode 100644
index 16b7a150..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/import-interpolation.css	
+++ /dev/null
@@ -1,6 +0,0 @@
-body {
-  width: 100%;
-}
-.a {
-  var: test;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/import-once.css b/test/Fixtures/lessjs (1.5)/expected/import-once.css
deleted file mode 100644
index 2f86b3b3..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/import-once.css	
+++ /dev/null
@@ -1,15 +0,0 @@
-#import {
-  color: #ff0000;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/import-reference.css b/test/Fixtures/lessjs (1.5)/expected/import-reference.css
deleted file mode 100644
index c2d055a7..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/import-reference.css	
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
-  The media statement above is invalid (no selector)
-  We should ban invalid media queries with properties and no selector?
-*/
-.visible {
-  color: red;
-}
-.visible .c {
-  color: green;
-}
-.visible {
-  color: green;
-}
-.visible:hover {
-  color: green;
-}
-.visible {
-  color: green;
-}
-.only-with-visible + .visible,
-.visible + .only-with-visible,
-.visible + .visible {
-  color: green;
-}
-.only-with-visible + .visible .sub,
-.visible + .only-with-visible .sub,
-.visible + .visible .sub {
-  color: green;
-}
-.b {
-  color: red;
-  color: green;
-}
-.b .c {
-  color: green;
-}
-.b:hover {
-  color: green;
-}
-.b {
-  color: green;
-}
-.b + .b {
-  color: green;
-}
-.b + .b .sub {
-  color: green;
-}
-.y {
-  pulled-in: yes;
-}
-/* comment pulled in */
-.visible {
-  extend: test;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/import.css b/test/Fixtures/lessjs (1.5)/expected/import.css
deleted file mode 100644
index a3749181..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/import.css	
+++ /dev/null
@@ -1,36 +0,0 @@
-@import url(http://fonts.googleapis.com/css?family=Open+Sans);
-@import url(/absolute/something.css) screen and (color) and (max-width: 600px);
-@import url("//ha.com/file.css") (min-width: 100px);
-#import-test {
-  height: 10px;
-  color: #ff0000;
-  width: 10px;
-  height: 30%;
-}
-@media screen and (max-width: 600px) {
-  body {
-    width: 100%;
-  }
-}
-#import {
-  color: #ff0000;
-}
-.mixin {
-  height: 10px;
-  color: #ff0000;
-}
-@media screen and (max-width: 601px) {
-  #css {
-    color: yellow;
-  }
-}
-@media screen and (max-width: 602px) {
-  body {
-    width: 100%;
-  }
-}
-@media screen and (max-width: 603px) {
-  #css {
-    color: yellow;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/javascript.css b/test/Fixtures/lessjs (1.5)/expected/javascript.css
deleted file mode 100644
index ba09e148..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/javascript.css	
+++ /dev/null
@@ -1,20 +0,0 @@
-.eval {
-  js: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  title: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  ternary: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  multiline: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.scope {
-  var: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  escaped: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.vars {
-  width: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.escape-interpol {
-  width: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.arrays {
-  ary: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  ary1: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/lazy-eval.css b/test/Fixtures/lessjs (1.5)/expected/lazy-eval.css
deleted file mode 100644
index 1adfb8f3..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/lazy-eval.css	
+++ /dev/null
@@ -1,3 +0,0 @@
-.lazy-eval {
-  width: 100%;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/media.css b/test/Fixtures/lessjs (1.5)/expected/media.css
deleted file mode 100644
index 607f0e44..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/media.css	
+++ /dev/null
@@ -1,219 +0,0 @@
-@media print {
-  .class {
-    color: blue;
-  }
-  .class .sub {
-    width: 42;
-  }
-  .top,
-  header > h1 {
-    color: #444444;
-  }
-}
-@media screen {
-  body {
-    max-width: 480;
-  }
-}
-@media all and (device-aspect-ratio: 16 / 9) {
-  body {
-    max-width: 800px;
-  }
-}
-@media all and (orientation: portrait) {
-  aside {
-    float: none;
-  }
-}
-@media handheld and (min-width: 42), screen and (min-width: 20em) {
-  body {
-    max-width: 480px;
-  }
-}
-@media print {
-  body {
-    padding: 20px;
-  }
-  body header {
-    background-color: red;
-  }
-}
-@media print and (orientation: landscape) {
-  body {
-    margin-left: 20px;
-  }
-}
-@media screen {
-  .sidebar {
-    width: 300px;
-  }
-}
-@media screen and (orientation: landscape) {
-  .sidebar {
-    width: 500px;
-  }
-}
-@media a and b {
-  .first .second .third {
-    width: 300px;
-  }
-  .first .second .fourth {
-    width: 3;
-  }
-}
-@media a and b and c {
-  .first .second .third {
-    width: 500px;
-  }
-}
-@media a, b and c {
-  body {
-    width: 95%;
-  }
-}
-@media a and x, b and c and x, a and y, b and c and y {
-  body {
-    width: 100%;
-  }
-}
-.a {
-  background: black;
-}
-@media handheld {
-  .a {
-    background: white;
-  }
-}
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-  .a {
-    background: red;
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-.b {
-  background: black;
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-@media handheld {
-  .b {
-    background: white;
-  }
-}
-@media handheld and (max-width: 200px) {
-  .b {
-    background: red;
-  }
-}
-@media only screen and (max-width: 200px) {
-  body {
-    width: 480px;
-  }
-}
-@media print {
-  @page :left {
-    margin: 0.5cm;
-  }
-  @page :right {
-    margin: 0.5cm;
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-  @page Test:first {
-    margin: 1cm;
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-  @page :first {
-    size: 8.5in 11in;
-    
-    @top-left {
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-      margin: 1cm;
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-    @bottom-right {
-      margin: 1cm;
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-      margin: 1cm;
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-    @right-top {
-      margin: 1cm;
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-    @right-middle {
-      content: "Page " counter(page);
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-    @right-bottom {
-      margin: 1cm;
-    }
-  }
-}
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-  .b {
-    background: red;
-  }
-}
-body {
-  background: red;
-}
-@media (max-width: 500px) {
-  body {
-    background: green;
-  }
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-@media (max-width: 1000px) {
-  body {
-    background: red;
-    background: blue;
-  }
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-@media (max-width: 1000px) and (max-width: 500px) {
-  body {
-    background: green;
-  }
-}
-@media (max-width: 1200px) {
-  /* a comment */
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-  body {
-    font-size: 11px;
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-  .nav-justified > li {
-    display: table-cell;
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-}
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-  .menu > li {
-    display: table-cell;
-  }
-}
-@media all and tv {
-  .all-and-tv-variables {
-    var: all-and-tv;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/merge.css b/test/Fixtures/lessjs (1.5)/expected/merge.css
deleted file mode 100644
index 4cf8c579..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/merge.css	
+++ /dev/null
@@ -1,22 +0,0 @@
-.test1 {
-  transform: rotate(90deg), skew(30deg), scale(2, 4);
-}
-.test2 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scaleX(45deg);
-}
-.test3 {
-  transform: scaleX(45deg);
-  background: url(data://img1.png);
-}
-.test4 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test5 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test6 {
-  transform: scale(2, 4);
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diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins-args.css b/test/Fixtures/lessjs (1.5)/expected/mixins-args.css
deleted file mode 100644
index 724613ad..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins-args.css	
+++ /dev/null
@@ -1,113 +0,0 @@
-#hidden {
-  color: transparent;
-}
-#hidden1 {
-  color: transparent;
-}
-.two-args {
-  color: blue;
-  width: 10px;
-  height: 99%;
-  border: 2px dotted #000000;
-}
-.one-arg {
-  width: 15px;
-  height: 49%;
-}
-.no-parens {
-  width: 5px;
-  height: 49%;
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-.no-args {
-  width: 5px;
-  height: 49%;
-}
-.var-args {
-  width: 45;
-  height: 17%;
-}
-.multi-mix {
-  width: 10px;
-  height: 29%;
-  margin: 4;
-  padding: 5;
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-body {
-  padding: 30px;
-  color: #ff0000;
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-.scope-mix {
-  width: 8;
-}
-.content {
-  width: 600px;
-}
-.content .column {
-  margin: 600px;
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-#same-var-name {
-  radius: 5px;
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-#var-inside {
-  width: 10px;
-}
-.arguments {
-  border: 1px solid #000000;
-  width: 1px;
-}
-.arguments2 {
-  border: 0px;
-  width: 0px;
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-.arguments3 {
-  border: 0px;
-  width: 0px;
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-.arguments4 {
-  border: 0 1 2 3 4;
-  rest: 1 2 3 4;
-  width: 0;
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-.edge-case {
-  border: "{";
-  width: "{";
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-.slash-vs-math {
-  border-radius: 0.4px;
-  border-radius: 0.5px;
-  border-radius: 6px;
-}
-.comma-vs-semi-colon {
-  one: a;
-  two: b, c;
-  one: d, e;
-  two: f;
-  one: g;
-  one: h;
-  one: i;
-  one: j;
-  one: k;
-  two: l;
-  one: m, n;
-  one: o, p;
-  two: q;
-  one: r, s;
-  two: t;
-}
-#named-conflict {
-  four: a, 11, 12, 13;
-  four: a, 21, 22, 23;
-}
-.test-mixin-default-arg {
-  defaults: 1px 1px 1px;
-  defaults: 2px 2px 2px;
-}
-.selector {
-  margin: 2, 2, 2, 2;
-}
-.selector2 {
-  margin: 2, 2, 2, 2;
-}
-.selector3 {
-  margin: 4;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins-closure.css b/test/Fixtures/lessjs (1.5)/expected/mixins-closure.css
deleted file mode 100644
index b1021b6f..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins-closure.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.class {
-  width: 99px;
-}
-.overwrite {
-  width: 99px;
-}
-.nested .class {
-  width: 5px;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins-guards.css b/test/Fixtures/lessjs (1.5)/expected/mixins-guards.css
deleted file mode 100644
index 25e6f287..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins-guards.css	
+++ /dev/null
@@ -1,82 +0,0 @@
-.light1 {
-  color: white;
-  margin: 1px;
-}
-.light2 {
-  color: black;
-  margin: 1px;
-}
-.max1 {
-  width: 6;
-}
-.max2 {
-  width: 8;
-}
-.glob1 {
-  margin: auto auto;
-}
-.ops1 {
-  height: gt-or-eq;
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-}
-.ops2 {
-  height: gt-or-eq;
-  height: not-eq;
-}
-.ops3 {
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-  height: not-eq;
-}
-.default1 {
-  content: default;
-}
-.test1 {
-  content: "true.";
-}
-.test2 {
-  content: "false.";
-}
-.test3 {
-  content: "false.";
-}
-.test4 {
-  content: "false.";
-}
-.test5 {
-  content: "false.";
-}
-.bool1 {
-  content: true and true;
-  content: true;
-  content: false, true;
-  content: false and true and true, true;
-  content: false, true and true;
-  content: false, false, true;
-  content: false, true and true and true, false;
-  content: not false;
-  content: not false and false, not false;
-}
-.equality-units {
-  test: pass;
-}
-.colorguardtest {
-  content: is #ff0000;
-  content: is not #0000ff its #ff0000;
-  content: is not #0000ff its #800080;
-}
-.stringguardtest {
-  content: is theme1;
-  content: is not theme2;
-  content: is theme1 no quotes;
-}
-#tryNumberPx {
-  catch: all;
-  declare: 4;
-  declare: 4px;
-}
-.call-lock-mixin .call-inner-lock-mixin {
-  a: 1;
-  x: 1;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins-important.css b/test/Fixtures/lessjs (1.5)/expected/mixins-important.css
deleted file mode 100644
index b100af7f..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins-important.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.class {
-  border: 1;
-  boxer: 1;
-  border-width: 1;
-  border: 2 !important;
-  boxer: 2 !important;
-  border-width: 2 !important;
-  border: 3;
-  boxer: 3;
-  border-width: 3;
-  border: 4 !important;
-  boxer: 4 !important;
-  border-width: 4 !important;
-  border: 5;
-  boxer: 5;
-  border-width: 5;
-  border: 0 !important;
-  boxer: 0 !important;
-  border-width: 0 !important;
-  border: 9 !important;
-  border: 9;
-  boxer: 9;
-  border-width: 9;
-}
-.class .inner {
-  test: 1;
-}
-.class .inner {
-  test: 2 !important;
-}
-.class .inner {
-  test: 3;
-}
-.class .inner {
-  test: 4 !important;
-}
-.class .inner {
-  test: 5;
-}
-.class .inner {
-  test: 0 !important;
-}
-.class .inner {
-  test: 9;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins-named-args.css b/test/Fixtures/lessjs (1.5)/expected/mixins-named-args.css
deleted file mode 100644
index e460aa10..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins-named-args.css	
+++ /dev/null
@@ -1,27 +0,0 @@
-.named-arg {
-  color: blue;
-  width: 5px;
-  height: 99%;
-  args: 1px 100%;
-  text-align: center;
-}
-.class {
-  width: 5px;
-  height: 19%;
-  args: 1px 20%;
-}
-.all-args-wrong-args {
-  width: 10px;
-  height: 9%;
-  args: 2px 10%;
-}
-.named-args2 {
-  width: 15px;
-  height: 49%;
-  color: #646464;
-}
-.named-args3 {
-  width: 5px;
-  height: 29%;
-  color: #123456;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins-nested.css b/test/Fixtures/lessjs (1.5)/expected/mixins-nested.css
deleted file mode 100644
index 6378c475..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins-nested.css	
+++ /dev/null
@@ -1,14 +0,0 @@
-.class .inner {
-  height: 300;
-}
-.class .inner .innest {
-  width: 30;
-  border-width: 60;
-}
-.class2 .inner {
-  height: 600;
-}
-.class2 .inner .innest {
-  width: 60;
-  border-width: 120;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins-pattern.css b/test/Fixtures/lessjs (1.5)/expected/mixins-pattern.css
deleted file mode 100644
index 8b828335..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins-pattern.css	
+++ /dev/null
@@ -1,47 +0,0 @@
-.zero {
-  variadic: true;
-  zero: 0;
-  one: 1;
-  two: 2;
-  three: 3;
-}
-.one {
-  variadic: true;
-  one: 1;
-  one-req: 1;
-  two: 2;
-  three: 3;
-}
-.two {
-  variadic: true;
-  two: 2;
-  three: 3;
-}
-.three {
-  variadic: true;
-  three-req: 3;
-  three: 3;
-}
-.left {
-  left: 1;
-}
-.right {
-  right: 1;
-}
-.border-right {
-  color: black;
-  border-right: 4px;
-}
-.border-left {
-  color: black;
-  border-left: 4px;
-}
-.only-right {
-  right: 33;
-}
-.only-left {
-  left: 33;
-}
-.left-right {
-  both: 330;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/mixins.css b/test/Fixtures/lessjs (1.5)/expected/mixins.css
deleted file mode 100644
index 32097f97..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/mixins.css	
+++ /dev/null
@@ -1,141 +0,0 @@
-.mixin {
-  border: 1px solid black;
-}
-.mixout {
-  border-color: orange;
-}
-.borders {
-  border-style: dashed;
-}
-#namespace .borders {
-  border-style: dotted;
-}
-#namespace .biohazard {
-  content: "death";
-}
-#namespace .biohazard .man {
-  color: transparent;
-}
-#theme > .mixin {
-  background-color: grey;
-}
-#container {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-#header .milk {
-  color: white;
-  border: 1px solid black;
-  background-color: grey;
-}
-#header #cookie {
-  border-style: dashed;
-}
-#header #cookie .chips {
-  border-style: dotted;
-}
-#header #cookie .chips .calories {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-.secure-zone {
-  color: transparent;
-}
-.direct {
-  border-style: dotted;
-}
-.bo,
-.bar {
-  width: 100%;
-}
-.bo {
-  border: 1px;
-}
-.ar.bo.ca {
-  color: black;
-}
-.jo.ki {
-  background: none;
-}
-.amp.support {
-  color: orange;
-}
-.amp.support .higher {
-  top: 0px;
-}
-.amp.support.deeper {
-  height: auto;
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-.extended {
-  width: 100%;
-  border: 1px;
-  background: none;
-  color: orange;
-  top: 0px;
-  height: auto;
-}
-.extended .higher {
-  top: 0px;
-}
-.extended.deeper {
-  height: auto;
-}
-.do .re .mi .fa .sol .la .si {
-  color: cyan;
-}
-.mutli-selector-parents {
-  color: cyan;
-}
-.foo .bar {
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-}
-.underParents {
-  color: red;
-}
-.parent .underParents {
-  color: red;
-}
-* + h1 {
-  margin-top: 25px;
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-legend + h1 {
-  margin-top: 0;
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-h1 + * {
-  margin-top: 10px;
-}
-* + h2 {
-  margin-top: 20px;
-}
-legend + h2 {
-  margin-top: 0;
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-h2 + * {
-  margin-top: 8px;
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-* + h3 {
-  margin-top: 15px;
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-legend + h3 {
-  margin-top: 0;
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-h3 + * {
-  margin-top: 5px;
-}
-.error {
-  background-image: "/a.png";
-  background-position: center center;
-}
-.test-rec .recursion {
-  color: black;
-}
-.button {
-  padding-left: 44px;
-}
-.button.large {
-  padding-left: 40em;
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diff --git a/test/Fixtures/lessjs (1.5)/expected/no-output.css b/test/Fixtures/lessjs (1.5)/expected/no-output.css
deleted file mode 100644
index 8b137891..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/no-output.css	
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/test/Fixtures/lessjs (1.5)/expected/operations.css b/test/Fixtures/lessjs (1.5)/expected/operations.css
deleted file mode 100644
index fb9e0aff..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/operations.css	
+++ /dev/null
@@ -1,49 +0,0 @@
-#operations {
-  color: #111111;
-  height: 9px;
-  width: 3em;
-  substraction: 0;
-  division: 1;
-}
-#operations .spacing {
-  height: 9px;
-  width: 3em;
-}
-.with-variables {
-  height: 16em;
-  width: 24em;
-  size: 1cm;
-}
-.with-functions {
-  color: #646464;
-  color: #ff8080;
-  color: #c94a4a;
-}
-.negative {
-  height: 0px;
-  width: 4px;
-}
-.shorthands {
-  padding: -1px 2px 0 -4px;
-}
-.rem-dimensions {
-  font-size: 5.5rem;
-}
-.colors {
-  color: #123;
-  border-color: #334455;
-  background-color: #000000;
-}
-.colors .other {
-  color: #222222;
-  border-color: #222222;
-}
-.negations {
-  variable: -4px;
-  variable1: 0px;
-  variable2: 0px;
-  variable3: 8px;
-  variable4: 0px;
-  paren: -4px;
-  paren2: 16px;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/parens.css b/test/Fixtures/lessjs (1.5)/expected/parens.css
deleted file mode 100644
index 627d70b3..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/parens.css	
+++ /dev/null
@@ -1,33 +0,0 @@
-.parens {
-  border: 2px solid #000000;
-  margin: 1px 3px 16 3;
-  width: 36;
-  padding: 2px 36px;
-}
-.more-parens {
-  padding: 8 4 4 4px;
-  width-all: 96;
-  width-first: 96;
-  width-keep: 96;
-  height-keep: 113;
-  height-all: 113;
-  height-parts: 113;
-  margin-keep: 12;
-  margin-parts: 12;
-  margin-all: 12;
-  border-radius-keep: 5px;
-  border-radius-parts: 1.142857142857143px;
-  border-radius-all: 5px;
-}
-.negative {
-  neg-var: -1;
-  neg-var-paren: -1;
-}
-.nested-parens {
-  width: 71;
-  height: 6;
-}
-.mixed-units {
-  margin: 2px 4em 1 5pc;
-  padding: 6px 1em 2px 2;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/rulesets.css b/test/Fixtures/lessjs (1.5)/expected/rulesets.css
deleted file mode 100644
index 408c76aa..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/rulesets.css	
+++ /dev/null
@@ -1,33 +0,0 @@
-#first > .one {
-  font-size: 2em;
-}
-#first > .one > #second .two > #deux {
-  width: 50%;
-}
-#first > .one > #second .two > #deux #third {
-  height: 100%;
-}
-#first > .one > #second .two > #deux #third:focus {
-  color: black;
-}
-#first > .one > #second .two > #deux #third:focus #fifth > #sixth .seventh #eighth + #ninth {
-  color: purple;
-}
-#first > .one > #second .two > #deux #fourth,
-#first > .one > #second .two > #deux #five,
-#first > .one > #second .two > #deux #six {
-  color: #110000;
-}
-#first > .one > #second .two > #deux #fourth .seven,
-#first > .one > #second .two > #deux #five .seven,
-#first > .one > #second .two > #deux #six .seven,
-#first > .one > #second .two > #deux #fourth .eight > #nine,
-#first > .one > #second .two > #deux #five .eight > #nine,
-#first > .one > #second .two > #deux #six .eight > #nine {
-  border: 1px solid black;
-}
-#first > .one > #second .two > #deux #fourth #ten,
-#first > .one > #second .two > #deux #five #ten,
-#first > .one > #second .two > #deux #six #ten {
-  color: red;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/scope.css b/test/Fixtures/lessjs (1.5)/expected/scope.css
deleted file mode 100644
index baa05523..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/scope.css	
+++ /dev/null
@@ -1,35 +0,0 @@
-.tiny-scope {
-  color: #998899;
-}
-.scope1 {
-  color: #0000ff;
-  border-color: #000000;
-}
-.scope1 .scope2 {
-  color: #0000ff;
-}
-.scope1 .scope2 .scope3 {
-  color: #ff0000;
-  border-color: #000000;
-  background-color: #ffffff;
-}
-.scope {
-  scoped-val: #008000;
-}
-.heightIsSet {
-  height: 1024px;
-}
-.useHeightInMixinCall {
-  mixin-height: 1024px;
-}
-.imported {
-  exists: true;
-}
-.testImported {
-  exists: true;
-}
-#allAreUsedHere {
-  default: 'top level';
-  scope: 'top level';
-  sub-scope-only: 'inside';
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/selectors.css b/test/Fixtures/lessjs (1.5)/expected/selectors.css
deleted file mode 100644
index 7dd6139d..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/selectors.css	
+++ /dev/null
@@ -1,142 +0,0 @@
-h1 a:hover,
-h2 a:hover,
-h3 a:hover,
-h1 p:hover,
-h2 p:hover,
-h3 p:hover {
-  color: red;
-}
-#all {
-  color: blue;
-}
-#the {
-  color: blue;
-}
-#same {
-  color: blue;
-}
-ul,
-li,
-div,
-q,
-blockquote,
-textarea {
-  margin: 0;
-}
-td {
-  margin: 0;
-  padding: 0;
-}
-td,
-input {
-  line-height: 1em;
-}
-a {
-  color: red;
-}
-a:hover {
-  color: blue;
-}
-div a {
-  color: green;
-}
-p a span {
-  color: yellow;
-}
-.foo .bar .qux,
-.foo .baz .qux {
-  display: block;
-}
-.qux .foo .bar,
-.qux .foo .baz {
-  display: inline;
-}
-.qux.foo .bar,
-.qux.foo .baz {
-  display: inline-block;
-}
-.qux .foo .bar .biz,
-.qux .foo .baz .biz {
-  display: none;
-}
-.a.b.c {
-  color: red;
-}
-.c .b.a {
-  color: red;
-}
-.foo .p.bar {
-  color: red;
-}
-.foo.p.bar {
-  color: red;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo,
-.foo + .bar,
-.bar + .foo,
-.bar + .bar {
-  background: amber;
-}
-.foo a > .foo a,
-.foo a > .bar a,
-.foo a > .foo b,
-.foo a > .bar b,
-.bar a > .foo a,
-.bar a > .bar a,
-.bar a > .foo b,
-.bar a > .bar b,
-.foo b > .foo a,
-.foo b > .bar a,
-.foo b > .foo b,
-.foo b > .bar b,
-.bar b > .foo a,
-.bar b > .bar a,
-.bar b > .foo b,
-.bar b > .bar b {
-  background: amber;
-}
-.other ::fnord {
-  color: red;
-}
-.other::fnord {
-  color: red;
-}
-.other ::bnord {
-  color: red;
-}
-.other::bnord {
-  color: red;
-}
-.blood {
-  color: red;
-}
-.bloodred {
-  color: green;
-}
-#blood.blood.red.black {
-  color: black;
-}
-:nth-child(3) {
-  selector: interpolated;
-}
-.test:nth-child(odd):not(:nth-child(3)) {
-  color: #ff0000;
-}
-[prop],
-[prop=10%],
-[prop="value3"],
-[prop*="val3"],
-[|prop~="val3"],
-[*|prop$="val3"],
-[ns|prop^="val3"],
-[3^="val3"],
-[3=3],
-[3] {
-  attributes: yes;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/strings.css b/test/Fixtures/lessjs (1.5)/expected/strings.css
deleted file mode 100644
index cd6d6020..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/strings.css	
+++ /dev/null
@@ -1,43 +0,0 @@
-#strings {
-  background-image: url("http://son-of-a-banana.com");
-  quotes: "~" "~";
-  content: "#*%:&^,)!.(~*})";
-  empty: "";
-  brackets: "{" "}";
-  escapes: "\"hello\" \\world";
-  escapes2: "\"llo";
-}
-#comments {
-  content: "/* hello */ // not-so-secret";
-}
-#single-quote {
-  quotes: "'" "'";
-  content: '""#!&""';
-  empty: '';
-  semi-colon: ';';
-}
-#escaped {
-  filter: DX.Transform.MS.BS.filter(opacity=50);
-}
-#one-line {
-  image: url(http://tooks.com);
-}
-#crazy {
-  image: url(http://), "}", url("http://}");
-}
-#interpolation {
-  url: "http://lesscss.org/dev/image.jpg";
-  url2: "http://lesscss.org/image-256.jpg";
-  url3: "http://lesscss.org#445566";
-  url4: "http://lesscss.org/hello";
-  url5: "http://lesscss.org/54.4px";
-}
-.mix-mul-class {
-  color: #0000ff;
-  color: #ff0000;
-  color: #000000;
-  color: #ffa500;
-}
-.watermark {
-  family: Univers, Arial, Verdana, San-Serif;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/urls.css b/test/Fixtures/lessjs (1.5)/expected/urls.css
deleted file mode 100644
index 9ef41981..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/urls.css	
+++ /dev/null
@@ -1,63 +0,0 @@
-@import "css/background.css";
-@import "import/import-test-d.css";
-@import "file.css";
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium), url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-  background: url("img.jpg") center / 100px;
-  background: #ffffff url(image.png) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700");
-}
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-  url: url('Trebuchet');
-}
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('import/assets/logo.png');
-}
-@font-face {
-  font-family: xecret;
-  src: url('import/assets/xecret.ttf');
-}
-#secret {
-  font-family: xecret, sans-serif;
-}
-#data-uri {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-guess {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-ascii {
-  uri-1: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-  uri-2: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-}
-#data-uri-toobig {
-  uri: url('../data/data-uri-fail.png');
-}
-#svg-functions {
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/variables.css b/test/Fixtures/lessjs (1.5)/expected/variables.css
deleted file mode 100644
index d671bf81..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/variables.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.variables {
-  width: 14cm;
-}
-.variables {
-  height: 24px;
-  color: #888888;
-  font-family: "Trebuchet MS", Verdana, sans-serif;
-  quotes: "~" "~";
-}
-.redef {
-  zero: 0;
-}
-.redef .inition {
-  three: 3;
-}
-.values {
-  minus-one: -1;
-  font-family: 'Trebuchet', 'Trebuchet', 'Trebuchet';
-  color: #888888 !important;
-  multi: something 'A', B, C, 'Trebuchet';
-}
-.variable-names {
-  name: 'hello';
-}
-.alpha {
-  filter: alpha(opacity=42);
-}
-.testPollution {
-  a: 'no-pollution';
-}
-.units {
-  width: 1px;
-  same-unit-as-previously: 1px;
-  square-pixel-divided: 1px;
-  odd-unit: 2;
-  percentage: 500%;
-  pixels: 500px;
-  conversion-metric-a: 30mm;
-  conversion-metric-b: 3cm;
-  conversion-imperial: 3.000000551181103in;
-  custom-unit: 420octocats;
-  custom-unit-cancelling: 18dogs;
-  mix-units: 2px;
-  invalid-units: 1px;
-}
diff --git a/test/Fixtures/lessjs (1.5)/expected/whitespace.css b/test/Fixtures/lessjs (1.5)/expected/whitespace.css
deleted file mode 100644
index bafbd90b..00000000
--- a/test/Fixtures/lessjs (1.5)/expected/whitespace.css	
+++ /dev/null
@@ -1,42 +0,0 @@
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.white,
-.space,
-.mania {
-  color: white;
-}
-.no-semi-column {
-  color: white;
-}
-.no-semi-column {
-  color: white;
-  white-space: pre;
-}
-.no-semi-column {
-  border: 2px solid #ffffff;
-}
-.newlines {
-  background: the,
-              great,
-              wall;
-  border: 2px
-          solid
-          black;
-}
-.sel .newline_ws .tab_ws {
-  color: white;
-  background-position: 45 -23;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/a.less b/test/Fixtures/lessjs (1.5)/less/a.less
deleted file mode 100644
index 28867995..00000000
--- a/test/Fixtures/lessjs (1.5)/less/a.less	
+++ /dev/null
@@ -1,17 +0,0 @@
-
-@var : blue;
-@color: color;
-
-.mixin{
-	@color: @var;
-	width:10;
-	width:10;
-	height:20;
-	color:red !important;
-	background:#000;
-	}
-
-.test{
-	.mixin;
-	color:blue;
-	}
diff --git a/test/Fixtures/lessjs (1.5)/less/charsets.less b/test/Fixtures/lessjs (1.5)/less/charsets.less
deleted file mode 100644
index 550d40e9..00000000
--- a/test/Fixtures/lessjs (1.5)/less/charsets.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-@charset "UTF-8";
-
-@import "import/import-charset-test";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/colors.less b/test/Fixtures/lessjs (1.5)/less/colors.less
deleted file mode 100644
index 656ca636..00000000
--- a/test/Fixtures/lessjs (1.5)/less/colors.less	
+++ /dev/null
@@ -1,92 +0,0 @@
-#yelow {
-  #short {
-    color: #fea;
-  }
-  #long {
-    color: #ffeeaa;
-  }
-  #rgba {
-    color: rgba(255, 238, 170, 0.1);
-  }
-  #argb {
-    color: argb(rgba(255, 238, 170, 0.1));
-  }
-}
-
-#blue {
-  #short {
-    color: #00f;
-  }
-  #long {
-    color: #0000ff;
-  }
-  #rgba {
-    color: rgba(0, 0, 255, 0.1);
-  }
-  #argb {
-    color: argb(rgba(0, 0, 255, 0.1));
-  }
-}
-
-#alpha #hsla {
-    color: hsla(11, 20%, 20%, 0.6);
-}
-
-#overflow {
-  .a { color: (#111111 - #444444); } // #000000
-  .b { color: (#eee + #fff); } // #ffffff
-  .c { color: (#aaa * 3); } // #ffffff
-  .d { color: (#00ee00 + #009900); } // #00ff00
-}
-
-#grey {
-  color: rgb(200, 200, 200);
-}
-
-#333333 {
-  color: rgb(20%, 20%, 20%);
-}
-
-#808080 {
-  color: hsl(50, 0%, 50%);
-}
-
-#00ff00 {
-  color: hsl(120, 100%, 50%);
-}
-
-.lightenblue {
-    color: lighten(blue, 10%);
-}
-
-.darkenblue {
-    color: darken(blue, 10%);
-}
-
-.unknowncolors {
-    color: blue2;
-    border: 2px solid superred;
-}
-
-.transparent {
-    color: transparent;
-    background-color: rgba(0, 0, 0, 0);
-}
-#alpha {
-    @colorvar: rgba(150, 200, 150, 0.7);
-    #fromvar {
-        opacity: alpha(@colorvar);
-    }
-    #short {
-        opacity: alpha(#aaa);
-    }
-    #long {
-        opacity: alpha(#bababa);
-    }
-    #rgba {
-        opacity: alpha(rgba(50, 120, 95, 0.2));
-    }
-    #hsl {
-        opacity: alpha(hsl(120, 100%, 50%));
-    }
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/comments.less b/test/Fixtures/lessjs (1.5)/less/comments.less
deleted file mode 100644
index 7859911e..00000000
--- a/test/Fixtures/lessjs (1.5)/less/comments.less	
+++ /dev/null
@@ -1,83 +0,0 @@
-/******************\
-*                  *
-*  Comment Header  *
-*                  *
-\******************/
-
-/*
-
-    Comment
-
-*/
-
-/*
- * Comment Test
- *
- * - cloudhead (http://cloudhead.net)
- *
- */
-
-////////////////
-@var: "content";
-////////////////
-
-/* Colors
- * ------
- *   #EDF8FC (background blue)
- *   #166C89 (darkest blue)
- *
- * Text:
- *   #333 (standard text) // A comment within a comment!
- *   #1F9EC9 (standard link)
- *
- */
-
-/* @group Variables
-------------------- */
-#comments /* boo *//* boo again*/,
-//.commented_out1
-//.commented_out2
-//.commented_out3
-.comments //end of comments1
-//end of comments2
-{
-  /**/ // An empty comment
-  color: red; /* A C-style comment */  /* A C-style comment */
-  background-color: orange; // A little comment
-  font-size: 12px;
-
-  /* lost comment */ content: @var;
-
-  border: 1px solid black;
-
-  // padding & margin //
-  padding: 0; // }{ '"
-  margin: 2em;
-} //
-
-/* commented out
-  #more-comments {
-    color: grey;
-  }
-*/
-
-.selector /* .with */, .lots, /* of */ .comments {
-  color: grey, /* blue */ orange;
-  -webkit-border-radius: 2px /* webkit only */;
-  -moz-border-radius: (2px * 4) /* moz only with operation */;
-}
-
-.mixin_def_with_colors(@a: white, // in
-       @b: 1px //put in @b - causes problems! --->
-	   ) // the
-	   when (@a = white) {
-	.test {
-	    color: @b;
-	}
-}
-.mixin_def_with_colors();
-
-#last { color: blue }
-//
-
-/*  *//* { *//*  *//*  *//*  */#div { color:#A33; }/* } */
diff --git a/test/Fixtures/lessjs (1.5)/less/compression/compression.less b/test/Fixtures/lessjs (1.5)/less/compression/compression.less
deleted file mode 100644
index e6a0fe79..00000000
--- a/test/Fixtures/lessjs (1.5)/less/compression/compression.less	
+++ /dev/null
@@ -1,32 +0,0 @@
-#colours {
-  color1: #fea;
-  color2: #ffeeaa;
-  color3: rgba(255, 238, 170, 0.1);
-  @color1: #fea;
-  string: "@{color1}";
-  /* comments are stripped */
-  // both types!
-  /*! but not this type
-      Note preserved whitespace
-  */
-}
-dimensions {
-  val: 0.1px;
-  val: 0em;
-  val: 4cm;
-  val: 0.2;
-  val: 5;
-  angles-must-have-unit: 0deg;
-  durations-must-have-unit: 0s;
-  length-doesnt-have-unit: 0px;
-  width: auto\9;
-}
-@page  {
-  marks: none;
-@top-left-corner {
-  vertical-align: top;
-}
-@top-left {
-  vertical-align: top;
-}
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/css-3.less b/test/Fixtures/lessjs (1.5)/less/css-3.less
deleted file mode 100644
index c31a6eb2..00000000
--- a/test/Fixtures/lessjs (1.5)/less/css-3.less	
+++ /dev/null
@@ -1,125 +0,0 @@
-.comma-delimited {
-  text-shadow: -1px -1px 1px red, 6px 5px 5px yellow;
-  -moz-box-shadow: 0pt 0pt 2px rgba(255, 255, 255, 0.4) inset,
-    0pt 4px 6px rgba(255, 255, 255, 0.4) inset;
-  -webkit-transform: rotate(-0.0000000001deg);
-}
-@font-face {
-  font-family: Headline;
-  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
-}
-.other {
-  -moz-transform: translate(0, 11em) rotate(-90deg);
-  transform: rotateX(45deg);
-}
-.item[data-cra_zy-attr1b-ut3=bold] {
-  font-weight: bold;
-}
-p:not([class*="lead"]) {
-  color: black;
-}
-
-input[type="text"].class#id[attr=32]:not(1) {
-  color: white;
-}
-
-div#id.class[a=1][b=2].class:not(1) {
-  color: white;
-}
-
-ul.comma > li:not(:only-child)::after {
-  color: white;
-}
-
-ol.comma > li:nth-last-child(2)::after {
-  color: white;
-}
-
-li:nth-child(4n+1),
-li:nth-child(-5n),
-li:nth-child(-n+2) {
-  color: white;
-}
-
-a[href^="http://"] {
-  color: black;
-}
-
-a[href$="http://"] {
-  color: black;
-}
-
-form[data-disabled] {
-  color: black;
-}
-
-p::before {
-  color: black;
-}
-
-#issue322 {
-  -webkit-animation: anim2 7s infinite ease-in-out;
-}
-
-@-webkit-keyframes frames {
-  0% { border: 1px }
-  5.5% { border: 2px }
-  100% { border: 3px }
-}
-
-@keyframes fontbulger1 {
-  to {
-    font-size: 15px;
-  }
-  from,to {
-    font-size: 12px;
-  }
-  0%,100% {
-    font-size: 12px;
-  }
-}
-
-.units {
-  font: 1.2rem/2rem;
-  font: 8vw/9vw;
-  font: 10vh/12vh;
-  font: 12vm/15vm;
-  font: 12vmin/15vmin;
-  font: 1.2ch/1.5ch;
-}
-
-@supports ( box-shadow: 2px 2px 2px black ) or
-          ( -moz-box-shadow: 2px 2px 2px black ) {
-  .outline {
-    box-shadow: 2px 2px 2px black;
-    -moz-box-shadow: 2px 2px 2px black;
-  }
-}
-
-@-x-document url-prefix(""github.com"") {
-  h1 {
-    color: red;
-  }
-}
-
-@viewport {
-  font-size: 10px;
-}
-@namespace foo url(http://www.example.com);
-
-foo|h1 { color: blue; }
-foo|* { color: yellow; }
-|h1 { color: red; }
-*|h1 { color: green; }
-h1 { color: green; }
-.upper-test {
-  UpperCaseProperties: allowed;
-}
-@host {
-  div {
-    display: block;
-  }
-}
-::distributed(input::placeholder) {
-  color: #b3b3b3;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/css-escapes.less b/test/Fixtures/lessjs (1.5)/less/css-escapes.less
deleted file mode 100644
index 6a4b2830..00000000
--- a/test/Fixtures/lessjs (1.5)/less/css-escapes.less	
+++ /dev/null
@@ -1,33 +0,0 @@
-@ugly: fuchsia;
-
-.escape\|random\|char {
-	color: red;
-}
-
-.mixin\!tUp {
-	font-weight: bold;
-}
-
-// class="404"
-.\34 04 {
-	background: red;
-	
-	strong {
-		color: @ugly;
-		.mixin\!tUp;
-	}
-}
-
-.trailingTest\+ {
-	color: red;
-}
-
-/* This hideous test of hideousness checks for the selector "blockquote" with various permutations of hex escapes */
-\62\6c\6f \63 \6B \0071 \000075o\74 e {
-	color: silver;
-}
-
-[ng\:cloak],
-ng\:form {
-  display: none;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/css-guards.less b/test/Fixtures/lessjs (1.5)/less/css-guards.less
deleted file mode 100644
index 41fbfbf5..00000000
--- a/test/Fixtures/lessjs (1.5)/less/css-guards.less	
+++ /dev/null
@@ -1,64 +0,0 @@
-
-.light when (lightness(@a) > 50%) {
-  color: green;
-}
-.dark when (lightness(@a) < 50%) {
-  color: orange;
-}
-@a: #ddd;
-
-.see-the {
-  @a: #444; // this mirrors what mixins do - they evaluate guards at the point of execution
-  .light();
-  .dark();
-}
-
-.hide-the {
-  .light();
-  .dark();
-}
-
-.multiple-conditions-1 when (@b = 1), (@c = 2), (@d = 3) {
-  color: red;
-}
-
-.multiple-conditions-2 when (@b = 1), (@c = 2), (@d = 2) {
-  color: blue;
-}
-
-@b: 2;
-@c: 3;
-@d: 3;
-
-.inheritance when (@b = 2) {
-  .test {
-    color: black;
-  }
-  &:hover {
-    color: pink;
-  }
-  .hideme when (@b = 1) {
-    color: green;
-  }
-  & when (@b = 1) {
-    hideme: green;
-  }
-}
-
-.hideme when (@b = 1) {
-  .test {
-    color: black;
-  }
-  &:hover {
-    color: pink;
-  }
-  .hideme when (@b = 1) {
-    color: green;
-  }
-}
-
-& when (@b = 1) {
-  .hideme {
-    color: red;
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/css.less b/test/Fixtures/lessjs (1.5)/less/css.less
deleted file mode 100644
index 766bdd4d..00000000
--- a/test/Fixtures/lessjs (1.5)/less/css.less	
+++ /dev/null
@@ -1,108 +0,0 @@
-@charset "utf-8";
-div { color: black; }
-div { width: 99%; }
-
-* {
-  min-width: 45em;
-}
-
-h1, h2 > a > p, h3 {
-  color: none;
-}
-
-div.class {
-  color: blue;
-}
-
-div#id {
-  color: green;
-}
-
-.class#id {
-  color: purple;
-}
-
-.one.two.three {
-  color: grey;
-}
-
-@media print {
-  * {
-    font-size: 3em;
-  }
-}
-
-@media screen {
-  * {
-    font-size: 10px;
-  }
-}
-
-@font-face {
-  font-family: 'Garamond Pro';
-}
-
-a:hover, a:link {
-  color: #999;
-}
-
-p, p:first-child {
-  text-transform: none;
-}
-
-q:lang(no) {
-  quotes: none;
-}
-
-p + h1 {
-  font-size: +2.2em;
-}
-
-#shorthands {
-  border: 1px solid #000;
-  font: 12px/16px Arial;
-  font: 100%/16px Arial;
-  margin: 1px 0;
-  padding: 0 auto;
-}
-
-#more-shorthands {
-  margin: 0;
-  padding: 1px 0 2px 0;
-  font: normal small/20px 'Trebuchet MS', Verdana, sans-serif;
-  font: 0/0 a;
-  border-radius: 5px / 10px;
-}
-
-.misc {
-  -moz-border-radius: 2px;
-  display: -moz-inline-stack;
-  width: .1em;
-  background-color: #009998;
-  background: -webkit-gradient(linear, left top, left bottom, from(red), to(blue));
-  margin: ;
-  .nested-multiple {
-	multiple-semi-colons: yes;;;;;;
-  };
-  filter: alpha(opacity=100);
-  width: auto\9;
-}
-
-#important {
-  color: red !important;
-  width: 100%!important;
-  height: 20px ! important;
-}
-
-.def-font(@name) {
-    @font-face {
-        font-family: @name
-    }
-}
-
-.def-font(font-a);
-.def-font(font-b);
-
-.æøå {
-  margin: 0;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/debug/import/test.less b/test/Fixtures/lessjs (1.5)/less/debug/import/test.less
deleted file mode 100644
index 795082f5..00000000
--- a/test/Fixtures/lessjs (1.5)/less/debug/import/test.less	
+++ /dev/null
@@ -1,25 +0,0 @@
-@charset "ISO-8859-1";
-
-.mixin_import1() {
-    @media all {
-        .tst {
-            color: black;
-            @media screen {
-                color: red;
-                .tst3 {
-                    color: white;
-                }
-            }
-        }
-    }
-}
-
-.mixin_import2() {
-    .tst2 {
-        color: white;
-    }
-}
-
-.tst3 {
-    color: grey;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/debug/linenumbers.less b/test/Fixtures/lessjs (1.5)/less/debug/linenumbers.less
deleted file mode 100644
index 172ba028..00000000
--- a/test/Fixtures/lessjs (1.5)/less/debug/linenumbers.less	
+++ /dev/null
@@ -1,23 +0,0 @@
-@charset "UTF-8";
-
-@import "import/test.less";
-
-.start() {
-  .test2 {
-      color: red;
-  }
-}
-
-.mix() {
-    color: black;
-}
-
-.test1 {
-  .mix();
-}
-
-.start();
-
-.mixin_import1();
-
-.mixin_import2();
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units.less b/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units.less
deleted file mode 100644
index 9b708de9..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  error: (1px + 3em);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units.txt b/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units.txt
deleted file mode 100644
index b5553618..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-SyntaxError: Incompatible units. Change the units or use the unit function. Bad units: 'px' and 'em'. in {path}add-mixed-units.less on line null, column 0:
-1   error: (1px + 3em);
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units2.less b/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units2.less
deleted file mode 100644
index 26631160..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units2.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  error: ((1px * 2px) + (3em * 3px));
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units2.txt b/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units2.txt
deleted file mode 100644
index cc65a760..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/add-mixed-units2.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-SyntaxError: Incompatible units. Change the units or use the unit function. Bad units: 'px*px' and 'em*px'. in {path}add-mixed-units2.less on line null, column 0:
-1   error: ((1px * 2px) + (3em * 3px));
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/bad-variable-declaration1.less b/test/Fixtures/lessjs (1.5)/less/errors/bad-variable-declaration1.less
deleted file mode 100644
index c2dc6ac0..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/bad-variable-declaration1.less	
+++ /dev/null
@@ -1 +0,0 @@
-@@demo: "hi";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/bad-variable-declaration1.txt b/test/Fixtures/lessjs (1.5)/less/errors/bad-variable-declaration1.txt
deleted file mode 100644
index 5ae9d4a4..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/bad-variable-declaration1.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: Unrecognised input in {path}bad-variable-declaration1.less on line 1, column 1:
-1 @@demo: "hi";
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/color-func-invalid-color.less b/test/Fixtures/lessjs (1.5)/less/errors/color-func-invalid-color.less
deleted file mode 100644
index 5a1edd01..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/color-func-invalid-color.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.test {
-  color: color("NOT A COLOR");
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/color-func-invalid-color.txt b/test/Fixtures/lessjs (1.5)/less/errors/color-func-invalid-color.txt
deleted file mode 100644
index 08990c30..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/color-func-invalid-color.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `color`: argument must be a color keyword or 3/6 digit hex e.g. #FFF in {path}color-func-invalid-color.less on line 2, column 10:
-1 .test {
-2   color: color("NOT A COLOR");
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/color-operation-error.less b/test/Fixtures/lessjs (1.5)/less/errors/color-operation-error.less
deleted file mode 100644
index 7c60c004..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/color-operation-error.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  prop: (3 / #fff);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/color-operation-error.txt b/test/Fixtures/lessjs (1.5)/less/errors/color-operation-error.txt
deleted file mode 100644
index 1b3f889f..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/color-operation-error.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-OperationError: Can't substract or divide a color from a number in {path}color-operation-error.less on line null, column 0:
-1   prop: (3 / #fff);
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/comment-in-selector.less b/test/Fixtures/lessjs (1.5)/less/errors/comment-in-selector.less
deleted file mode 100644
index a7d26396..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/comment-in-selector.less	
+++ /dev/null
@@ -1 +0,0 @@
-#gaga /* Comment */ span { color: red }
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/comment-in-selector.txt b/test/Fixtures/lessjs (1.5)/less/errors/comment-in-selector.txt
deleted file mode 100644
index e48f878c..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/comment-in-selector.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: Unrecognised input in {path}comment-in-selector.less on line 1, column 21:
-1 #gaga /* Comment */ span { color: red }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/divide-mixed-units.less b/test/Fixtures/lessjs (1.5)/less/errors/divide-mixed-units.less
deleted file mode 100644
index d228b7c4..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/divide-mixed-units.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  error: (1px / 3em);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/divide-mixed-units.txt b/test/Fixtures/lessjs (1.5)/less/errors/divide-mixed-units.txt
deleted file mode 100644
index c189d2aa..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/divide-mixed-units.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Multiple units in dimension. Correct the units or use the unit function. Bad unit: px/em in {path}divide-mixed-units.less on line 2, column 3:
-1 .a {
-2   error: (1px / 3em);
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/extend-no-selector.less b/test/Fixtures/lessjs (1.5)/less/errors/extend-no-selector.less
deleted file mode 100644
index 84689ef3..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/extend-no-selector.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-:extend(.a all) {
-  property: red;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/extend-no-selector.txt b/test/Fixtures/lessjs (1.5)/less/errors/extend-no-selector.txt
deleted file mode 100644
index bd2e3cd7..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/extend-no-selector.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-SyntaxError: Extend must be used to extend a selector, it cannot be used on its own in {path}extend-no-selector.less on line 1, column 17:
-1 :extend(.a all) {
-2   property: red;
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/extend-not-at-end.less b/test/Fixtures/lessjs (1.5)/less/errors/extend-not-at-end.less
deleted file mode 100644
index 90ee512c..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/extend-not-at-end.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a:extend(.b all).c {
-  property: red;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/extend-not-at-end.txt b/test/Fixtures/lessjs (1.5)/less/errors/extend-not-at-end.txt
deleted file mode 100644
index 32ebedfc..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/extend-not-at-end.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-SyntaxError: Extend can only be used at the end of selector in {path}extend-not-at-end.less on line 1, column 21:
-1 .a:extend(.b all).c {
-2   property: red;
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-missing.less b/test/Fixtures/lessjs (1.5)/less/errors/import-missing.less
deleted file mode 100644
index 5ce8e4d9..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-missing.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-.a {
-    color: green;
-	// tests line number for import reference is correct
-}
-
-@import "file-does-not-exist.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-missing.txt b/test/Fixtures/lessjs (1.5)/less/errors/import-missing.txt
deleted file mode 100644
index 488d154a..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-missing.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-FileError: '{pathhref}file-does-not-exist.less' wasn't found{404status} in {path}import-missing.less on line 6, column 1:
-5 
-6 @import "file-does-not-exist.less";
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-no-semi.less b/test/Fixtures/lessjs (1.5)/less/errors/import-no-semi.less
deleted file mode 100644
index bf2c7f65..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-no-semi.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "this-statement-is-invalid.less"
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-no-semi.txt b/test/Fixtures/lessjs (1.5)/less/errors/import-no-semi.txt
deleted file mode 100644
index 8b3f795c..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-no-semi.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: Unrecognised input in {path}import-no-semi.less on line 1, column 1:
-1 @import "this-statement-is-invalid.less"
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder1.less b/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder1.less
deleted file mode 100644
index 4280673b..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder1.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "imports/import-subfolder1.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder1.txt b/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder1.txt
deleted file mode 100644
index 97629276..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder1.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-NameError: .mixin-not-defined is undefined in {path}mixin-not-defined.less on line 11, column 1:
-10 
-11 .mixin-not-defined();
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder2.less b/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder2.less
deleted file mode 100644
index a6b9b9ce..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder2.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "imports/import-subfolder2.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder2.txt b/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder2.txt
deleted file mode 100644
index 7d514efc..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/import-subfolder2.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: missing opening `{` in {path}parse-error-curly-bracket.less on line 1, column 2:
-1 }}
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/imports/import-subfolder1.less b/test/Fixtures/lessjs (1.5)/less/errors/imports/import-subfolder1.less
deleted file mode 100644
index 24ec0532..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/imports/import-subfolder1.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "subfolder/mixin-not-defined.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/imports/import-subfolder2.less b/test/Fixtures/lessjs (1.5)/less/errors/imports/import-subfolder2.less
deleted file mode 100644
index 6058ad14..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/imports/import-subfolder2.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "subfolder/parse-error-curly-bracket.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/imports/import-test.less b/test/Fixtures/lessjs (1.5)/less/errors/imports/import-test.less
deleted file mode 100644
index a91ae054..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/imports/import-test.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-.someclass
-{
-    font-weight: bold;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/imports/subfolder/mixin-not-defined.less b/test/Fixtures/lessjs (1.5)/less/errors/imports/subfolder/mixin-not-defined.less
deleted file mode 100644
index 2bb2d091..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/imports/subfolder/mixin-not-defined.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "../../mixin-not-defined.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/imports/subfolder/parse-error-curly-bracket.less b/test/Fixtures/lessjs (1.5)/less/errors/imports/subfolder/parse-error-curly-bracket.less
deleted file mode 100644
index f37fa9d0..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/imports/subfolder/parse-error-curly-bracket.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "../../parse-error-curly-bracket.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/javascript-error.less b/test/Fixtures/lessjs (1.5)/less/errors/javascript-error.less
deleted file mode 100644
index 9cffb9ff..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/javascript-error.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.scope {
-    var: `this.foo.toJS()`;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/javascript-error.txt b/test/Fixtures/lessjs (1.5)/less/errors/javascript-error.txt
deleted file mode 100644
index 3c83a966..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/javascript-error.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: JavaScript evaluation error: 'TypeError: Cannot call method 'toJS' of undefined' in {path}javascript-error.less on line 2, column 27:
-1 .scope {
-2     var: `this.foo.toJS()`;
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-1.less b/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-1.less
deleted file mode 100644
index 9b0e23af..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-1.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-.mixin(@a : 4, @b : 3, @c: 2) {
-    will: fail;
-}
-.mixin-test {
-    .mixin(@a: 5; @b: 6, @c: 7);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-1.txt b/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-1.txt
deleted file mode 100644
index a07f5e9d..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-1.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Cannot mix ; and , as delimiter types in {path}mixed-mixin-definition-args-1.less on line 5, column 30:
-4 .mixin-test {
-5     .mixin(@a: 5; @b: 6, @c: 7);
-6 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-2.less b/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-2.less
deleted file mode 100644
index c9709427..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-2.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-.mixin(@a : 4, @b : 3, @c: 2) {
-    will: fail;
-}
-.mixin-test {
-    .mixin(@a: 5, @b: 6; @c: 7);
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-2.txt b/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-2.txt
deleted file mode 100644
index fa00183b..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixed-mixin-definition-args-2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Cannot mix ; and , as delimiter types in {path}mixed-mixin-definition-args-2.less on line 5, column 26:
-4 .mixin-test {
-5     .mixin(@a: 5, @b: 6; @c: 7);
-6 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-defined.less b/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-defined.less
deleted file mode 100644
index e2dad5ce..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-defined.less	
+++ /dev/null
@@ -1,11 +0,0 @@
-
-.error-is-further-on() {
-}
-
-.pad-here-to-reproduce-error-in() {
-}
-
-.the-import-subfolder-test() {
-}
-
-.mixin-not-defined();
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-defined.txt b/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-defined.txt
deleted file mode 100644
index 97629276..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-defined.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-NameError: .mixin-not-defined is undefined in {path}mixin-not-defined.less on line 11, column 1:
-10 
-11 .mixin-not-defined();
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched.less b/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched.less
deleted file mode 100644
index be0d6b1a..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@saxofon:trumpete;
-
-.mixin(saxofon) {
-}
-
-.mixin(@saxofon);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched.txt b/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched.txt
deleted file mode 100644
index 57df9772..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-RuntimeError: No matching definition was found for `.mixin(trumpete)` in {path}mixin-not-matched.less on line 6, column 1:
-5 
-6 .mixin(@saxofon);
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched2.less b/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched2.less
deleted file mode 100644
index 14f44bf3..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched2.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@saxofon:trumpete;
-
-.mixin(@a, @b) {
-}
-
-.mixin(@a: @saxofon);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched2.txt b/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched2.txt
deleted file mode 100644
index dceedaf0..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/mixin-not-matched2.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-RuntimeError: No matching definition was found for `.mixin(@a:trumpete)` in {path}mixin-not-matched2.less on line 6, column 1:
-5 
-6 .mixin(@a: @saxofon);
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/multiple-guards-on-css-selectors.less b/test/Fixtures/lessjs (1.5)/less/errors/multiple-guards-on-css-selectors.less
deleted file mode 100644
index 4eabb60a..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/multiple-guards-on-css-selectors.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-@ie8: true;
-.a when (@ie8 = true),
-.b {
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/multiple-guards-on-css-selectors.txt b/test/Fixtures/lessjs (1.5)/less/errors/multiple-guards-on-css-selectors.txt
deleted file mode 100644
index 3d23e26b..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/multiple-guards-on-css-selectors.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Guards are only currently allowed on a single selector. in {path}multiple-guards-on-css-selectors.less on line 3, column 1:
-2 .a when (@ie8 = true),
-3 .b {
-4 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/multiply-mixed-units.less b/test/Fixtures/lessjs (1.5)/less/errors/multiply-mixed-units.less
deleted file mode 100644
index ff983a85..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/multiply-mixed-units.less	
+++ /dev/null
@@ -1,7 +0,0 @@
-/* Test */
-#blah {
-  // blah
-}
-.a {
-  error: (1px * 1em);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/multiply-mixed-units.txt b/test/Fixtures/lessjs (1.5)/less/errors/multiply-mixed-units.txt
deleted file mode 100644
index 9ed834f1..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/multiply-mixed-units.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Multiple units in dimension. Correct the units or use the unit function. Bad unit: em*px in {path}multiply-mixed-units.less on line 6, column 3:
-5 .a {
-6   error: (1px * 1em);
-7 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-1.less b/test/Fixtures/lessjs (1.5)/less/errors/parens-error-1.less
deleted file mode 100644
index 7c8ec10e..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-1.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  something: (12 (13 + 5 -23) + 5);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-1.txt b/test/Fixtures/lessjs (1.5)/less/errors/parens-error-1.txt
deleted file mode 100644
index 6fc40ac0..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-1.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: expected ')' got '(' in {path}parens-error-1.less on line 2, column 18:
-1 .a {
-2   something: (12 (13 + 5 -23) + 5);
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-2.less b/test/Fixtures/lessjs (1.5)/less/errors/parens-error-2.less
deleted file mode 100644
index 4a392b8e..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-2.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  something: (12 * (13 + 5 -23));
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-2.txt b/test/Fixtures/lessjs (1.5)/less/errors/parens-error-2.txt
deleted file mode 100644
index cee5c52d..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: expected ')' got '-' in {path}parens-error-2.less on line 2, column 28:
-1 .a {
-2   something: (12 * (13 + 5 -23));
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-3.less b/test/Fixtures/lessjs (1.5)/less/errors/parens-error-3.less
deleted file mode 100644
index 9e6d5405..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-3.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  something: (12 + (13 + 10 -23));
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-3.txt b/test/Fixtures/lessjs (1.5)/less/errors/parens-error-3.txt
deleted file mode 100644
index 3280ef04..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parens-error-3.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: expected ')' got '-' in {path}parens-error-3.less on line 2, column 29:
-1 .a {
-2   something: (12 + (13 + 10 -23));
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-curly-bracket.less b/test/Fixtures/lessjs (1.5)/less/errors/parse-error-curly-bracket.less
deleted file mode 100644
index a2950a11..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-curly-bracket.less	
+++ /dev/null
@@ -1 +0,0 @@
-}}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-curly-bracket.txt b/test/Fixtures/lessjs (1.5)/less/errors/parse-error-curly-bracket.txt
deleted file mode 100644
index 7d514efc..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-curly-bracket.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: missing opening `{` in {path}parse-error-curly-bracket.less on line 1, column 2:
-1 }}
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-missing-bracket.less b/test/Fixtures/lessjs (1.5)/less/errors/parse-error-missing-bracket.less
deleted file mode 100644
index 144a6edf..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-missing-bracket.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-body {
-  background-color: #fff;
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-missing-bracket.txt b/test/Fixtures/lessjs (1.5)/less/errors/parse-error-missing-bracket.txt
deleted file mode 100644
index 0005f464..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-missing-bracket.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-ParseError: missing closing `}` in {path}parse-error-missing-bracket.less on line 3, column 1:
-2   background-color: #fff;
-3 
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-with-import.less b/test/Fixtures/lessjs (1.5)/less/errors/parse-error-with-import.less
deleted file mode 100644
index 6be3de85..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-with-import.less	
+++ /dev/null
@@ -1,13 +0,0 @@
-@import 'import/import-test.less';
-
-body
-{
-    font-family: arial, sans-serif;
-}
-
-nonsense;
-
-.clickable
-{
-    cursor: pointer;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-with-import.txt b/test/Fixtures/lessjs (1.5)/less/errors/parse-error-with-import.txt
deleted file mode 100644
index 07732c92..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/parse-error-with-import.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ParseError: Unrecognised input in {path}parse-error-with-import.less on line 8, column 9:
-7 
-8 nonsense;
-9 
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-ie5-hack.less b/test/Fixtures/lessjs (1.5)/less/errors/property-ie5-hack.less
deleted file mode 100644
index 51bf6e39..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-ie5-hack.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.test {
-  display/*/: block; /*sorry for IE5*/
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-ie5-hack.txt b/test/Fixtures/lessjs (1.5)/less/errors/property-ie5-hack.txt
deleted file mode 100644
index e42ef90e..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-ie5-hack.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ParseError: Unrecognised input in {path}property-ie5-hack.less on line 2, column 3:
-1 .test {
-2   display/*/: block; /*sorry for IE5*/
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root.less b/test/Fixtures/lessjs (1.5)/less/errors/property-in-root.less
deleted file mode 100644
index 8fed4be3..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-.a() {
-  prop:1;
-}
-.a();
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root.txt b/test/Fixtures/lessjs (1.5)/less/errors/property-in-root.txt
deleted file mode 100644
index 04b27766..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: properties must be inside selector blocks, they cannot be in the root. in {path}property-in-root.less on line 2, column 3:
-1 .a() {
-2   prop:1;
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root2.less b/test/Fixtures/lessjs (1.5)/less/errors/property-in-root2.less
deleted file mode 100644
index ce8656d1..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root2.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "property-in-root";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root2.txt b/test/Fixtures/lessjs (1.5)/less/errors/property-in-root2.txt
deleted file mode 100644
index 04b27766..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: properties must be inside selector blocks, they cannot be in the root. in {path}property-in-root.less on line 2, column 3:
-1 .a() {
-2   prop:1;
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root3.less b/test/Fixtures/lessjs (1.5)/less/errors/property-in-root3.less
deleted file mode 100644
index 056c2f72..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root3.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-prop:1;
-.a {
-  prop:1;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root3.txt b/test/Fixtures/lessjs (1.5)/less/errors/property-in-root3.txt
deleted file mode 100644
index 68ef9454..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/property-in-root3.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-SyntaxError: properties must be inside selector blocks, they cannot be in the root. in {path}property-in-root3.less on line 1, column 1:
-1 prop:1;
-2 .a {
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/recursive-variable.less b/test/Fixtures/lessjs (1.5)/less/errors/recursive-variable.less
deleted file mode 100644
index c1ca75f1..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/recursive-variable.less	
+++ /dev/null
@@ -1 +0,0 @@
-@bodyColor: darken(@bodyColor, 30%);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/recursive-variable.txt b/test/Fixtures/lessjs (1.5)/less/errors/recursive-variable.txt
deleted file mode 100644
index eb616e7d..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/recursive-variable.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-NameError: Recursive variable definition for @bodyColor in {path}recursive-variable.less on line 1, column 20:
-1 @bodyColor: darken(@bodyColor, 30%);
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient1.less b/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient1.less
deleted file mode 100644
index c069ff72..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient1.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: svg-gradient(horizontal, black, white);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient1.txt b/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient1.txt
deleted file mode 100644
index ec662fe6..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient1.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `svg-gradient`: svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center' in {path}svg-gradient1.less on line 2, column 6:
-1 .a {
-2   a: svg-gradient(horizontal, black, white);
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient2.less b/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient2.less
deleted file mode 100644
index ff14ef11..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient2.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: svg-gradient(to bottom, black, orange, 45%, white);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient2.txt b/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient2.txt
deleted file mode 100644
index 7004115f..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `svg-gradient`: svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position] in {path}svg-gradient2.less on line 2, column 6:
-1 .a {
-2   a: svg-gradient(to bottom, black, orange, 45%, white);
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient3.less b/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient3.less
deleted file mode 100644
index 8f185246..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient3.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: svg-gradient(black, orange);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient3.txt b/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient3.txt
deleted file mode 100644
index eb0b483e..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/svg-gradient3.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `svg-gradient`: svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position] in {path}svg-gradient3.less on line 2, column 6:
-1 .a {
-2   a: svg-gradient(black, orange);
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/unit-function.less b/test/Fixtures/lessjs (1.5)/less/errors/unit-function.less
deleted file mode 100644
index 119e9818..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/unit-function.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  font-size: unit(80/16,rem);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/errors/unit-function.txt b/test/Fixtures/lessjs (1.5)/less/errors/unit-function.txt
deleted file mode 100644
index baf90f42..00000000
--- a/test/Fixtures/lessjs (1.5)/less/errors/unit-function.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `unit`: the first argument to unit must be a number. Have you forgotten parenthesis? in {path}unit-function.less on line 2, column 14:
-1 .a {
-2   font-size: unit(80/16,rem);
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/extend-chaining.less b/test/Fixtures/lessjs (1.5)/less/extend-chaining.less
deleted file mode 100644
index aad221ea..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extend-chaining.less	
+++ /dev/null
@@ -1,91 +0,0 @@
-//very simple chaining
-.a {
-  color: black;
-}
-.b:extend(.a) {}
-.c:extend(.b) {}
-
-//very simple chaining, ordering not important
-
-.d:extend(.e) {}
-.e:extend(.f) {}
-.f {
-  color: black;
-}
-
-//extend with all
-
-.g.h {
-  color: black;
-}
-.i.j:extend(.g all) {
-  color: white;
-}
-.k:extend(.i all) {}
-
-//extend multi-chaining
-
-.l {
-  color: black;
-}
-.m:extend(.l){}
-.n:extend(.m){}
-.o:extend(.n){}
-.p:extend(.o){}
-.q:extend(.p){}
-.r:extend(.q){}
-.s:extend(.r){}
-.t:extend(.s){}
-
-// self referencing is ignored
-
-.u {color: black;}
-.v.u.v:extend(.u all){}
-
-// circular reference because the new extend product will match the existing extend
-
-.w:extend(.w) {color: black;}
-.v.w.v:extend(.w all){}
-
-// classic circular references
-
-.x:extend(.z) {
-  color: x;
-}
-.y:extend(.x) {
-  color: y;
-}
-.z:extend(.y) {
-  color: z;
-}
-
-//very simple chaining, but with the extend inside the ruleset
-.va {
-  color: black;
-}
-.vb {
-  &:extend(.va);
-  color: white;
-}
-.vc {
-  &:extend(.vb);
-}
-
-// media queries - dont extend outside, do extend inside
-
-@media tv {
-  .ma:extend(.a,.b,.c,.d,.e,.f,.g,.h,.i,.j,.k,.l,.m,.n,.o,.p,.q,.r,.s,.t,.u,.v,.w,.x,.y,.z,.md) {
-    color: black;
-  }
-  .md {
-    color: white;
-  }
-  @media plasma {
-    .me, .mf {
-      &:extend(.mb,.md);
-      background: red;
-    }
-  }
-}
-.mb:extend(.ma) {};
-.mc:extend(.mb) {};
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/extend-clearfix.less b/test/Fixtures/lessjs (1.5)/less/extend-clearfix.less
deleted file mode 100644
index 82445dfa..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extend-clearfix.less	
+++ /dev/null
@@ -1,19 +0,0 @@
-.clearfix {
-  *zoom: 1;
-  &:after {
-    content: '';
-    display: block;
-    clear: both;
-    height: 0;
-  }
-}
-
-.foo {
-  &:extend(.clearfix all);
-  color: red;
-}
-
-.bar {
-  &:extend(.clearfix all);
-  color: blue;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/extend-exact.less b/test/Fixtures/lessjs (1.5)/less/extend-exact.less
deleted file mode 100644
index 41dc4130..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extend-exact.less	
+++ /dev/null
@@ -1,46 +0,0 @@
-.replace.replace,
-.c.replace + .replace {
-  .replace,
-  .c {
-    prop: copy-paste-replace;
-  }
-}
-.rep_ace:extend(.replace.replace .replace) {}
-
-.a .b .c {
-  prop: not_effected;
-}
-
-.a {
-  prop: is_effected;
-  .b {
-    prop: not_effected;
-  }
-  .b.c {
-    prop: not_effected;
-  }
-}
-
-.c, .a {
-  .b, .a {
-    .a, .c {
-      prop: not_effected;
-    }
-  }
-}
-
-.effected {
-  &:extend(.a);
-  &:extend(.b);
-  &:extend(.c);
-}
-
-.e {
-  && {
-    prop: extend-double;
-    &:hover {
-      hover: not-extended;
-    }
-  }
-}
-.dbl:extend(.e.e) {}
diff --git a/test/Fixtures/lessjs (1.5)/less/extend-media.less b/test/Fixtures/lessjs (1.5)/less/extend-media.less
deleted file mode 100644
index 1b22c3fa..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extend-media.less	
+++ /dev/null
@@ -1,24 +0,0 @@
-.ext1 .ext2 {
-  background: black;
-}
-
-@media tv {
-  .ext1 .ext3 {
-    color: white;
-  }
-  .tv-lowres :extend(.ext1 all) {
-    background: blue;
-  }
-  @media hires {
-    .ext1 .ext4 {
-      color: green;
-    }
-    .tv-hires :extend(.ext1 all) {
-      background: red;
-    }
-  }
-}
-
-.all:extend(.ext1 all) {
-
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/extend-nest.less b/test/Fixtures/lessjs (1.5)/less/extend-nest.less
deleted file mode 100644
index 9d4d27bb..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extend-nest.less	
+++ /dev/null
@@ -1,65 +0,0 @@
-.sidebar {
-  width: 300px;
-  background: red;
-
-  .box {
-    background: #FFF;
-    border: 1px solid #000;
-    margin: 10px 0;
-  }
-}
-
-.sidebar2 {
-  &:extend(.sidebar all);
-  background: blue;
-}
-
-.type1 {
-    .sidebar3 {
-      &:extend(.sidebar all);
-      background: green;
-    }
-}
-
-.type2 {
-  &.sidebar4 {
-    &:extend(.sidebar all);
-    background: red;
-  }
-}
-
-.button {
-  color: black;
-  &:hover {
-    color: white;
-  }
-}
-.submit {
-  &:extend(.button);
-  &:hover:extend(.button:hover) {}
-}
-
-.nomatch {
-  &:hover:extend(.button :hover) {}
-}
-
-.button2 {
-  :hover {
-    nested: white;
-  }
-}
-.button2 :hover {
-  notnested: black;
-}
-
-.nomatch :extend(.button2:hover) {}
-
-.amp-test-a,
-.amp-test-b {
-  .amp-test-c &.amp-test-d&.amp-test-e {
-    .amp-test-f&+&.amp-test-g:extend(.amp-test-h) {}
-  }
-}
-.amp-test-h {
-  test: extended by masses of selectors;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/extend-selector.less b/test/Fixtures/lessjs (1.5)/less/extend-selector.less
deleted file mode 100644
index c7588ee0..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extend-selector.less	
+++ /dev/null
@@ -1,99 +0,0 @@
-.error {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error {
-  display: none;
-}
-.badError:extend(.error all) {
-  border-width: 3px;
-}
-
-.foo .bar, .foo .baz {
-    display: none;
-}
-
-.ext1 .ext2
-    :extend(.foo all) {
-}
-
-.ext3:extend(.foo all),
-.ext4:extend(.foo all) {
-}
-
-div.ext5,
-.ext6 > .ext5 {
-    width: 100px;
-}
-
-.should-not-exist-in-output,
-.ext7:extend(.ext5 all) {
-}
-
-.ext {
-  test: 1;
-}
-// same as 
-// .a .c:extend(.ext all)
-// .b .c:extend(.ext all)
-// .a .c .d
-// .b .c .d
-.a, .b {
-  test: 2;
-  .c:extend(.ext all) {
-    test: 3;
-    .d {
-      test: 4;
-    }
-  }
-}
-
-.replace.replace,
-.c.replace + .replace {
-  .replace,
-  .c {
-    prop: copy-paste-replace;
-  }
-}
-.rep_ace:extend(.replace all) {}
-
-.attributes {
-  [data="test"] {
-    extend: attributes;
-  }
-  .attribute-test {
-    &:extend([data="test"] all);
-  }
-  [data] {
-    extend: attributes2;
-  }
-  .attribute-test2 {
-    &:extend([data] all); //you could argue it should match [data="test"]... not for now though...
-  }
-  @attr-data: "test3";
-  [data=@{attr-data}] {
-    extend: attributes2;
-  }
-  .attribute-test {
-    &:extend([data="test3"] all);
-  }
-}
-
-.header {
-  .header-nav {
-    background: red;
-    &:before {
-      background: blue;
-    }
-  }
-}
-
-.footer {
-  .footer-nav {
-    &:extend( .header .header-nav all );
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/extend.less b/test/Fixtures/lessjs (1.5)/less/extend.less
deleted file mode 100644
index 1db5d431..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extend.less	
+++ /dev/null
@@ -1,81 +0,0 @@
-.error {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error {
-  display: none;
-}
-.badError {
-  &:extend(.error all);
-  border-width: 3px;
-}
-
-.foo .bar, .foo .baz {
-    display: none;
-}
-
-.ext1 .ext2 {
-    &:extend(.foo all);
-}
-
-.ext3,
-.ext4 {
-  &:extend(.foo all);
-  &:extend(.bar all);
-}
-
-div.ext5,
-.ext6 > .ext5 {
-    width: 100px;
-}
-
-.ext7 {
-    &:extend(.ext5 all);
-}
-
-.ext8.ext9 {
-  result: add-foo;
-}
-.ext8 .ext9,
-.ext8 + .ext9,
-.ext8 > .ext9 {
-  result: bar-matched;
-}
-.ext8.nomatch {
-  result: none;
-}
-.ext8 {
-  .ext9 {
-    result: match-nested-bar;
-  }
-}
-.ext8 {
-  &.ext9 {
-    result: match-nested-foo;
-  }
-}
-
-.fuu:extend(.ext8.ext9 all) {}
-.buu:extend(.ext8 .ext9 all) {}
-.zap:extend(.ext8 + .ext9 all) {}
-.zoo:extend(.ext8 > .ext9 all) {}
-
-.aa {
-  color: black;
-  .dd {
-    background: red;
-  }
-}
-.bb {
-  background: red;
-  .bb {
-    color: black;
-  }
-}
-.cc:extend(.aa,.bb) {}
-.ee:extend(.dd all,.bb) {}
-.ff:extend(.dd,.bb all) {}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/extract-and-length.less b/test/Fixtures/lessjs (1.5)/less/extract-and-length.less
deleted file mode 100644
index d81e118f..00000000
--- a/test/Fixtures/lessjs (1.5)/less/extract-and-length.less	
+++ /dev/null
@@ -1,133 +0,0 @@
-
-// simple array/list:
-
-.multiunit {
-  @v: abc "abc" 1 1px 1% #123;
-  length: length(@v);
-  extract: extract(@v, 1) extract(@v, 2) extract(@v, 3) extract(@v, 4) extract(@v, 5) extract(@v, 6);
-}
-
-.incorrect-index {
-    @v1: a  b  c;
-    @v2: a, b, c;
-    v1: extract(@v1,  5);
-    v2: extract(@v2, -2);
-}
-
-.scalar {
-    @var:          variable;
-    var-value:     extract(@var, 1);
-    var-length:    length(@var);
-    ill-index:     extract(@var, 2);
-
-    name-value:    extract(name, 1);
-    string-value:  extract("string", 1);
-    number-value:  extract(12345678, 1);
-    color-value:   extract(blue, 1);
-    rgba-value:    extract(rgba(80, 160, 240, 0.67), 1);
-    empty-value:   extract(~'', 1);
-    
-    name-length:   length(name);
-    string-length: length("string");
-    number-length: length(12345678);
-    color-length:  length(blue);
-    rgba-length:   length(rgba(80, 160, 240, 0.67));
-    empty-length:  length(~'');
-}
-
-.mixin-arguments {
-    .mixin-args(a b c d);
-    .mixin-args(a, b, c, d);
-    .mixin-args(1; 2; 3; 4);
-}
-
-.mixin-args(@value) {
-    &-1 {
-        length:  length(@value);
-        extract: extract(@value, 3) ~"|" extract(@value, 2) ~"|" extract(@value, 1);
-    }
-}
-
-.mixin-args(...) { 
-    &-2 {
-        length:  length(@arguments);
-        extract: extract(@arguments, 3) ~"|" extract(@arguments, 2) ~"|" extract(@arguments, 1);
-    }
-}
-
-.mixin-args(@values...) {
-    &-3 {
-        length:  length(@values);
-        extract: extract(@values, 3) ~"|" extract(@values, 2) ~"|" extract(@values, 1);
-    }
-}
-
-.mixin-args(@head, @tail...) {
-    &-4 {
-        length:  length(@tail);
-        extract: extract(@tail, 2) ~"|" extract(@tail, 1);
-    }
-}
-
-// "multidimensional" array/list
-
-.md-space-comma {
-    @v: a b c, 1 2 3, "x" "y" "z";
-    length-1:  length(@v);
-    extract-1: extract(@v, 2);
-    length-2:  length(extract(@v, 2));
-    extract-2: extract(extract(@v, 2), 2);
-
-    &-as-args {.mixin-args(a b c, 1 2 3, "x" "y" "z")}
-}
-
-.md-cat-space-comma {
-    @a: a b c;
-    @b: 1 2 3;
-    @c: "x" "y" "z";
-    @v: @a, @b, @c;
-    length-1:  length(@v);
-    extract-1: extract(@v, 2);
-    length-2:  length(extract(@v, 2));
-    extract-2: extract(extract(@v, 2), 2);
-    
-    &-as-args {.mixin-args(@a, @b, @c)}
-}
-
-.md-cat-comma-space {
-    @a: a, b, c;
-    @b: 1, 2, 3;
-    @c: "x", "y", "z";
-    @v: @a @b @c;
-    length-1:  length(@v);
-    extract-1: extract(@v, 2);
-    length-2:  length(extract(@v, 2));
-    extract-2: extract(extract(@v, 2), 2);
-
-    &-as-args {.mixin-args(@a @b @c)}
-}
-
-.md-3D {
-    @a: a b c d, 1 2 3 4;
-    @b: 5 6 7 8, e f g h;
-    .3D(@a, @b);
-    
-    .3D(...) {
-
-        @v1:       @arguments;
-        length-1:  length(@v1);
-        extract-1: extract(@v1, 1);
-        
-        @v2:       extract(@v1, 2);
-        length-2:  length(@v2);
-        extract-2: extract(@v2, 1);
-        
-        @v3:       extract(@v2, 1);
-        length-3:  length(@v3);
-        extract-3: extract(@v3, 3);
-
-        @v4:       extract(@v3, 4);
-        length-4:  length(@v4);
-        extract-4: extract(@v4, 1);
-    }
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/functions.less b/test/Fixtures/lessjs (1.5)/less/functions.less
deleted file mode 100644
index b50a0da5..00000000
--- a/test/Fixtures/lessjs (1.5)/less/functions.less	
+++ /dev/null
@@ -1,153 +0,0 @@
-#functions {
-  @var: 10;
-  @colors: #000, #fff;
-  color: _color("evil red"); // #660000
-  width: increment(15);
-  height: undefined("self");
-  border-width: add(2, 3);
-  variable: increment(@var);
-  background: linear-gradient(@colors);
-}
-
-#built-in {
-  @r: 32;
-  escaped: e("-Some::weird(#thing, y)");
-  lighten: lighten(#ff0000, 40%);
-  darken: darken(#ff0000, 40%);
-  saturate: saturate(#29332f, 20%);
-  desaturate: desaturate(#203c31, 20%);
-  greyscale: greyscale(#203c31);
-  hsl-clamp: hsl(380, 150%, 150%);
-  spin-p: spin(hsl(340, 50%, 50%), 40);
-  spin-n: spin(hsl(30, 50%, 50%), -40);
-  luma-white: luma(#fff);
-  luma-black: luma(#000);
-  luma-black-alpha: luma(rgba(0,0,0,0.5));
-  luma-red: luma(#ff0000);
-  luma-green: luma(#00ff00);
-  luma-blue: luma(#0000ff);
-  luma-yellow: luma(#ffff00);
-  luma-cyan: luma(#00ffff);
-  luma-white-alpha: luma(rgba(255,255,255,0.5));
-  contrast-filter: contrast(30%);
-  saturate-filter: saturate(5%);
-  contrast-white: contrast(#fff);
-  contrast-black: contrast(#000);
-  contrast-red: contrast(#ff0000);
-  contrast-green: contrast(#00ff00);
-  contrast-blue: contrast(#0000ff);
-  contrast-yellow: contrast(#ffff00);
-  contrast-cyan: contrast(#00ffff);
-  contrast-light: contrast(#fff, #111111, #eeeeee);
-  contrast-dark: contrast(#000, #111111, #eeeeee);
-  contrast-wrongorder: contrast(#fff, #eeeeee, #111111, 0.5);
-  contrast-light-thresh: contrast(#fff, #111111, #eeeeee, 0.5);
-  contrast-dark-thresh: contrast(#000, #111111, #eeeeee, 0.5);
-  contrast-high-thresh: contrast(#555, #111111, #eeeeee, 0.6);
-  contrast-low-thresh: contrast(#555, #111111, #eeeeee, 0.1);
-  contrast-light-thresh-per: contrast(#fff, #111111, #eeeeee, 50%);
-  contrast-dark-thresh-per: contrast(#000, #111111, #eeeeee, 50%);
-  contrast-high-thresh-per: contrast(#555, #111111, #eeeeee, 60%);
-  contrast-low-thresh-per: contrast(#555, #111111, #eeeeee, 10%);
-  format: %("rgb(%d, %d, %d)", @r, 128, 64);
-  format-string: %("hello %s", "world");
-  format-multiple: %("hello %s %d", "earth", 2);
-  format-url-encode: %('red is %A', #ff0000);
-  eformat: e(%("rgb(%d, %d, %d)", @r, 128, 64));
-  
-  unitless: unit(12px);
-  unit: unit((13px + 1px), em);
-
-  hue: hue(hsl(98, 12%, 95%));
-  saturation: saturation(hsl(98, 12%, 95%));
-  lightness: lightness(hsl(98, 12%, 95%));
-  hsvhue: hsvhue(hsv(98, 12%, 95%));
-  hsvsaturation: hsvsaturation(hsv(98, 12%, 95%));
-  hsvvalue: hsvvalue(hsv(98, 12%, 95%));
-  red: red(#f00);
-  green: green(#0f0);
-  blue: blue(#00f);
-  rounded: round((@r/3));
-  rounded-two: round((@r/3), 2);
-  roundedpx: round((10px / 3));
-  roundedpx-three: round((10px / 3), 3);
-  rounded-percentage: round(10.2%);
-  ceil: ceil(10.1px);
-  floor: floor(12.9px);
-  sqrt: sqrt(25px);
-  pi: pi();
-  mod: mod(13m, 11cm); // could take into account units, doesn't at the moment
-  abs: abs(-4%);
-  tan: tan(42deg);
-  sin: sin(10deg);
-  cos: cos(12);
-  atan: atan(tan(0.1rad));
-  atan: convert(acos(cos(34deg)), deg);
-  atan: convert(acos(cos(50grad)), deg);
-  pow: pow(8px, 2);
-  pow: pow(4, 3);
-  pow: pow(3, 3em);
-  min: min(0);
-  min: min("junk", 6, 5);
-  min: min(1pc, 3pt);
-  max: max(1, 3);
-  max: max(3%, 1cm, 8%, 2mm);
-  percentage: percentage((10px / 50));
-  color: color("#ff0011");
-  tint: tint(#777777, 13);
-  tint-full: tint(#777777, 100);
-  tint-percent: tint(#777777, 13%);
-  shade: shade(#777777, 13);
-  shade-full: shade(#777777, 100);
-  shade-percent: shade(#777777, 13%);
-
-  fade-out: fadeOut(red, 5%); // support fadeOut and fadeout
-  fade-in: fadein(fadeout(red, 10%), 5%);
-  
-  hsv: hsv(5, 50%, 30%);
-  hsva: hsva(3, 50%, 30%, 0.2);
-
-  mix: mix(#ff0000, #ffff00, 80);
-  mix-0: mix(#ff0000, #ffff00, 0);
-  mix-100: mix(#ff0000, #ffff00, 100);
-  mix-weightless: mix(#ff0000, #ffff00);
-  mixt: mix(#ff0000, transparent);
-
-  .is-a {
-    color: iscolor(#ddd);
-    color1: iscolor(red);
-    color2: iscolor(rgb(0, 0, 0));
-    color3: iscolor(transparent);
-    keyword: iskeyword(hello);
-    number: isnumber(32);
-    string: isstring("hello");
-    pixel: ispixel(32px);
-    percent: ispercentage(32%);
-    em: isem(32em);
-    cat: isunit(32cat, cat);
-  }
-}
-
-#alpha {
-  alpha: darken(hsla(25, 50%, 50%, 0.6), 10%);
-  alpha2: alpha(rgba(3, 4, 5, 0.5));
-  alpha3: alpha(transparent);
-}
-
-#blendmodes {
-  multiply: multiply(#f60000, #f60000);
-  screen: screen(#f60000, #0000f6);
-  overlay: overlay(#f60000, #0000f6);
-  softlight: softlight(#f60000, #ffffff);
-  hardlight: hardlight(#f60000, #0000f6);
-  difference: difference(#f60000, #0000f6);
-  exclusion: exclusion(#f60000, #0000f6);
-  average: average(#f60000, #0000f6);
-  negation: negation(#f60000, #313131);
-}
-
-#extract-and-length {
-  @anon: A B C 1 2 3;
-  extract: extract(@anon, 6) extract(@anon, 5) extract(@anon, 4) extract(@anon, 3) extract(@anon, 2) extract(@anon, 1);
-  length: length(@anon);
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/ie-filters.less b/test/Fixtures/lessjs (1.5)/less/ie-filters.less
deleted file mode 100644
index 3350b653..00000000
--- a/test/Fixtures/lessjs (1.5)/less/ie-filters.less	
+++ /dev/null
@@ -1,15 +0,0 @@
-@fat: 0;
-@cloudhead: "#000000";
-
-.nav {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity = 20);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=@fat);
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#333333", endColorstr=@cloudhead, GradientType=@fat);
-}
-.evalTest(@arg) {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=@arg);
-}
-.evalTest1 {
-  .evalTest(30);
-  .evalTest(5);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import-inline.less b/test/Fixtures/lessjs (1.5)/less/import-inline.less
deleted file mode 100644
index 95a11896..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import-inline.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-@import (inline) url("import/import-test-d.css") (min-width:600px);
-@import (inline, css) url("import/invalid-css.less");
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import-interpolation.less b/test/Fixtures/lessjs (1.5)/less/import-interpolation.less
deleted file mode 100644
index 21cfe086..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import-interpolation.less	
+++ /dev/null
@@ -1,8 +0,0 @@
-@my_theme: "test";
-
-@import "import/import-@{my_theme}-e.less";
-
-@import "import/import-@{in}@{terpolation}.less";
-
-@in: "in";
-@terpolation: "terpolation";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import-once.less b/test/Fixtures/lessjs (1.5)/less/import-once.less
deleted file mode 100644
index 0a4024a3..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import-once.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@import "import/import-once-test-c";
-@import "import/import-once-test-c";
-@import "import/import-once-test-c.less";
-@import "import/deeper/import-once-test-a";
-@import (multiple) "import/import-test-f.less";
-@import (multiple) "import/import-test-f.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import-reference.less b/test/Fixtures/lessjs (1.5)/less/import-reference.less
deleted file mode 100644
index cf9da168..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import-reference.less	
+++ /dev/null
@@ -1,18 +0,0 @@
-@import (reference) url("import-once.less");
-@import (reference) url("css-3.less");
-@import (reference) url("media.less");
-/*
-  The media statement above is invalid (no selector)
-  We should ban invalid media queries with properties and no selector?
-*/
-@import (reference) url("import/import-reference.less");
-
-.b {
-  .z();
-}
-
-.zz();
-
-.visible:extend(.z all) {
-  extend: test;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import.less b/test/Fixtures/lessjs (1.5)/less/import.less
deleted file mode 100644
index 01689408..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import.less	
+++ /dev/null
@@ -1,21 +0,0 @@
-@import url(http://fonts.googleapis.com/css?family=Open+Sans);
-
-@import url(/absolute/something.css) screen and (color) and (max-width: 600px);
-
-@var: 100px;
-@import url("//ha.com/file.css") (min-width:@var);
-
-#import-test {
-  .mixin;
-  width: 10px;
-  height: (@a + 10%);
-}
-@import "import/import-test-e" screen and (max-width: 600px);
-
-@import url("import/import-test-a.less");
-
-@import (less, multiple) "import/import-test-d.css" screen and (max-width: 601px);
-
-@import (multiple) "import/import-test-e" screen and (max-width: 602px);
-
-@import (less, multiple) url("import/import-test-d.css") screen and (max-width: 603px);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/deeper/import-once-test-a.less b/test/Fixtures/lessjs (1.5)/less/import/deeper/import-once-test-a.less
deleted file mode 100644
index 8a747fc0..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/deeper/import-once-test-a.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "../import-once-test-c";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-and-relative-paths-test.less b/test/Fixtures/lessjs (1.5)/less/import/import-and-relative-paths-test.less
deleted file mode 100644
index da699989..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-and-relative-paths-test.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@import "../css/background.css";
-@import "import-test-d.css";
-
-@import "imports/logo";
-@import "imports/font";
-
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-charset-test.less b/test/Fixtures/lessjs (1.5)/less/import/import-charset-test.less
deleted file mode 100644
index 07a66e1a..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-charset-test.less	
+++ /dev/null
@@ -1 +0,0 @@
-@charset "ISO-8859-1";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-interpolation.less b/test/Fixtures/lessjs (1.5)/less/import/import-interpolation.less
deleted file mode 100644
index aa49a702..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-interpolation.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "import-@{in}@{terpolation}2.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-interpolation2.less b/test/Fixtures/lessjs (1.5)/less/import/import-interpolation2.less
deleted file mode 100644
index 12bfb4e1..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-interpolation2.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-.a {
-  var: test;
-}
-
-@in: "redefined-does-nothing";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-once-test-c.less b/test/Fixtures/lessjs (1.5)/less/import/import-once-test-c.less
deleted file mode 100644
index 686747a8..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-once-test-c.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-
-@c: red;
-
-#import {
-  color: @c;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-reference.less b/test/Fixtures/lessjs (1.5)/less/import/import-reference.less
deleted file mode 100644
index 9eac45fc..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-reference.less	
+++ /dev/null
@@ -1,43 +0,0 @@
-.z {
-  color: red;
-  .c {
-    color: green;
-  }
-}
-.only-with-visible,
-.z {
-  color: green;
-  &:hover {
-    color: green;
-  }
-  & {
-    color: green;
-  }
-  & + & {
-    color: green;
-    .sub {
-      color: green;
-    }
-  }
-}
-
-& {
-  .hidden {
-    hidden: true;
-  }
-}
-
-@media tv {
-  .hidden {
-    hidden: true;
-  }
-}
-
-/* comment is not output */
-
-.zz {
-  .y {
-    pulled-in: yes;
-  }
-  /* comment pulled in */
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-test-a.less b/test/Fixtures/lessjs (1.5)/less/import/import-test-a.less
deleted file mode 100644
index b3b3b8fc..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-test-a.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-@import "import-test-b.less";
-@a: 20%;
-@import "urls.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-test-b.less b/test/Fixtures/lessjs (1.5)/less/import/import-test-b.less
deleted file mode 100644
index ce2d35a8..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-test-b.less	
+++ /dev/null
@@ -1,8 +0,0 @@
-@import "import-test-c";
-
-@b: 100%;
-
-.mixin {
-  height: 10px;
-  color: @c;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-test-c.less b/test/Fixtures/lessjs (1.5)/less/import/import-test-c.less
deleted file mode 100644
index 686747a8..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-test-c.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-
-@c: red;
-
-#import {
-  color: @c;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-test-d.css b/test/Fixtures/lessjs (1.5)/less/import/import-test-d.css
deleted file mode 100644
index 30575f01..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-test-d.css	
+++ /dev/null
@@ -1 +0,0 @@
-#css { color: yellow; }
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-test-e.less b/test/Fixtures/lessjs (1.5)/less/import/import-test-e.less
deleted file mode 100644
index 98b84b0a..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-test-e.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-
-body { width: 100% }
diff --git a/test/Fixtures/lessjs (1.5)/less/import/import-test-f.less b/test/Fixtures/lessjs (1.5)/less/import/import-test-f.less
deleted file mode 100644
index a63d67f6..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/import-test-f.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-@import "import-test-e";
-
-.test-f {
-  height: 10px;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/imports/font.less b/test/Fixtures/lessjs (1.5)/less/import/imports/font.less
deleted file mode 100644
index 5abb7e76..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/imports/font.less	
+++ /dev/null
@@ -1,8 +0,0 @@
-@font-face {
-	font-family: xecret;
-	src: url('../assets/xecret.ttf');
-}
-
-#secret {
-	font-family: xecret, sans-serif;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/import/imports/logo.less b/test/Fixtures/lessjs (1.5)/less/import/imports/logo.less
deleted file mode 100644
index 22893a23..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/imports/logo.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('../assets/logo.png');
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/import/invalid-css.less b/test/Fixtures/lessjs (1.5)/less/import/invalid-css.less
deleted file mode 100644
index ed585d63..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/invalid-css.less	
+++ /dev/null
@@ -1 +0,0 @@
-this isn't very valid CSS.
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/import/urls.less b/test/Fixtures/lessjs (1.5)/less/import/urls.less
deleted file mode 100644
index bb48f77a..00000000
--- a/test/Fixtures/lessjs (1.5)/less/import/urls.less	
+++ /dev/null
@@ -1 +0,0 @@
-// empty file showing that it loads from the relative path first
diff --git a/test/Fixtures/lessjs (1.5)/less/javascript.less b/test/Fixtures/lessjs (1.5)/less/javascript.less
deleted file mode 100644
index b826a787..00000000
--- a/test/Fixtures/lessjs (1.5)/less/javascript.less	
+++ /dev/null
@@ -1,29 +0,0 @@
-.eval {
-    js: `42`;
-    js: `1 + 1`;
-    js: `"hello world"`;
-    js: `[1, 2, 3]`;
-    title: `typeof process.title`;
-    ternary: `(1 + 1 == 2 ? true : false)`;
-    multiline: `(function(){var x = 1 + 1;
-           return x})()`;
-}
-.scope {
-    @foo: 42;
-    var: `parseInt(this.foo.toJS())`;
-    escaped: ~`2 + 5 + 'px'`;
-}
-.vars {
-    @var: `4 + 4`;
-    width: @var;
-}
-.escape-interpol {
-    @world: "world";
-    width: ~`"hello" + " " + @{world}`;
-}
-.arrays {
-    @ary:  1, 2, 3;
-    @ary2: 1  2  3;
-    ary: `@{ary}.join(', ')`;
-    ary1: `@{ary2}.join(', ')`;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/lazy-eval.less b/test/Fixtures/lessjs (1.5)/less/lazy-eval.less
deleted file mode 100644
index 72b3fd46..00000000
--- a/test/Fixtures/lessjs (1.5)/less/lazy-eval.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@var: @a;
-@a: 100%;
-
-.lazy-eval {
-  width: @var;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/legacy/legacy.less b/test/Fixtures/lessjs (1.5)/less/legacy/legacy.less
deleted file mode 100644
index 92d00088..00000000
--- a/test/Fixtures/lessjs (1.5)/less/legacy/legacy.less	
+++ /dev/null
@@ -1,7 +0,0 @@
-@media (-o-min-device-pixel-ratio: 2/1) {
-  .test-math-and-units {
-    font: ignores 0/0 rules;
-    test-division: 4 / 2 + 5em;
-    simple: 1px + 1px;
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/media.less b/test/Fixtures/lessjs (1.5)/less/media.less
deleted file mode 100644
index 01a6a020..00000000
--- a/test/Fixtures/lessjs (1.5)/less/media.less	
+++ /dev/null
@@ -1,234 +0,0 @@
-
-// For now, variables can't be declared inside @media blocks.
-
-@var: 42;
-
-@media print {
-    .class {
-        color: blue;
-        .sub {
-            width: @var;
-        }
-    }
-    .top, header > h1 {
-        color: (#222 * 2);
-    }
-}
-
-@media screen {
-    @base: 8;
-    body { max-width: (@base * 60); }
-}
-
-@ratio_large: 16;
-@ratio_small: 9;
-
-@media all and (device-aspect-ratio: @ratio_large / @ratio_small) {
-   body { max-width: 800px; }
-}
-
-@media all and (orientation:portrait) {
-    aside { float: none; }
-}
-
-@media handheld and (min-width: @var), screen and (min-width: 20em) {
-    body {
-        max-width: 480px;
-    }
-}
-
-body {
-    @media print {
-        padding: 20px;
-
-        header {
-            background-color: red;
-        }
-
-        @media (orientation:landscape) {
-            margin-left: 20px;
-        }
-    }
-}
-
-@media screen {
-  .sidebar {
-    width: 300px;
-    @media (orientation: landscape) {
-      width: 500px;
-    }
-  }
-}
-
-@media a {
-  .first {
-    @media b {
-      .second {
-        .third {
-          width: 300px;
-          @media c {
-            width: 500px;
-          }
-        }
-        .fourth {
-          width: 3;
-        }
-      }
-    }
-  }
-}
-
-body {
-    @media a, b and c {
-        width: 95%;
-
-        @media x, y {
-            width: 100%;
-        }
-    }
-}
-
-.mediaMixin(@fallback: 200px) {
-    background: black;
-
-    @media handheld {
-        background: white;
-
-        @media (max-width: @fallback) {
-            background: red;
-        }
-    }
-}
-
-.a {
-  .mediaMixin(100px);
-}
-
-.b {
-  .mediaMixin();
-}
-@smartphone: ~"only screen and (max-width: 200px)";
-@media @smartphone {
-  body {
-    width: 480px;
-  }
-}
-
-@media print {
-  @page :left {
-    margin: 0.5cm;
-  }
-  @page :right {
-    margin: 0.5cm;
-  }
-  @page Test:first {
-    margin: 1cm;
-  }
-  @page :first {
-    size: 8.5in 11in;
-	@top-left {
-      margin: 1cm;
-    }
-    @top-left-corner {
-      margin: 1cm;
-    }
-    @top-center {
-      margin: 1cm;
-    }
-    @top-right {
-      margin: 1cm;
-    }
-    @top-right-corner {
-      margin: 1cm;
-    }
-    @bottom-left {
-      margin: 1cm;
-    }
-    @bottom-left-corner {
-      margin: 1cm;
-    }
-    @bottom-center {
-      margin: 1cm;
-    }
-    @bottom-right {
-      margin: 1cm;
-    }
-    @bottom-right-corner {
-      margin: 1cm;
-    }
-    @left-top {
-      margin: 1cm;
-    }
-    @left-middle {
-      margin: 1cm;
-    }
-    @left-bottom {
-      margin: 1cm;
-    }
-    @right-top {
-      margin: 1cm;
-    }
-    @right-middle {
-      content: "Page " counter(page);
-    }
-    @right-bottom {
-      margin: 1cm;
-    }
-  }
-}
-
-@media (-webkit-min-device-pixel-ratio: 2), (min--moz-device-pixel-ratio: 2), (-o-min-device-pixel-ratio: 2/1), (min-resolution: 2dppx), (min-resolution: 128dpcm) {
-  .b {
-    background: red;
-  }
-}
-
-.bg() {
-    background: red;
-
-    @media (max-width: 500px) {
-        background: green;
-    }
-}
-
-body {
-    .bg();
-}
-
-@bpMedium: 1000px;
-@media (max-width: @bpMedium) {
-    body {        
-        .bg();
-        background: blue;
-    }
-}
-
-@media (max-width: 1200px) {
-  /* a comment */
-
-  @media (max-width: 900px) {
-    body { font-size: 11px; }
-  }
-}
-
-.nav-justified {
-  @media (min-width: 480px) {
-    > li {
-      display: table-cell;
-    }
-  }
-}
-
-.menu
-{
-  @media (min-width: 768px) {
-    .nav-justified();
-  }
-}
-@all: ~"all";
-@tv: ~"tv";
-@media @all and @tv {
-  .all-and-tv-variables {
-    var: all-and-tv;
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/merge.less b/test/Fixtures/lessjs (1.5)/less/merge.less
deleted file mode 100644
index 52d0796e..00000000
--- a/test/Fixtures/lessjs (1.5)/less/merge.less	
+++ /dev/null
@@ -1,51 +0,0 @@
-.first-transform() {
-  transform+: rotate(90deg), skew(30deg);
-}
-.second-transform() {
-  transform+: scale(2,4);
-}
-.third-transform() {
-  transform: scaleX(45deg);
-}
-.fourth-transform() {
-  transform+: scaleX(45deg);
-}
-.fifth-transform() {
-  transform+: scale(2,4) !important;
-}
-.first-background() {
-  background+: url(data://img1.png);
-}
-.second-background() {
-  background+: url(data://img2.png);
-}
-
-.test1 {
-  // Can merge values
-  .first-transform();
-  .second-transform();
-}
-.test2 {
-  // Wont merge values without +: merge directive, for backwards compatibility with css
-  .first-transform();
-  .third-transform();
-}
-.test3 {
-  // Wont merge values from two sources with different properties
-  .fourth-transform();
-  .first-background();
-}
-.test4 {
-  // Wont merge values from sources that merked as !important, for backwards compatibility with css 
-  .first-transform();
-  .fifth-transform();
-}
-.test5 {
-  // Wont merge values from mixins that merked as !important, for backwards compatibility with css 
-  .first-transform();
-  .second-transform() !important;
-}
-.test6 {
-  // Ignores !merge if no peers found
-  .second-transform();
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins-args.less b/test/Fixtures/lessjs (1.5)/less/mixins-args.less
deleted file mode 100644
index 8cdc67df..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins-args.less	
+++ /dev/null
@@ -1,215 +0,0 @@
-.mixin (@a: 1px, @b: 50%) {
-  width: (@a * 5);
-  height: (@b - 1%);
-}
-
-.mixina (@style, @width, @color: black) {
-    border: @width @style @color;
-}
-
-.mixiny
-(@a: 0, @b: 0) {
-  margin: @a;
-  padding: @b;
-}
-
-.hidden() {
-  color: transparent; // asd
-}
-
-#hidden {
-  .hidden;
-}
-
-#hidden1 {
-  .hidden();
-}
-
-.two-args {
-  color: blue;
-  .mixin(2px, 100%);
-  .mixina(dotted, 2px);
-}
-
-.one-arg {
-  .mixin(3px);
-}
-
-.no-parens {
-  .mixin;
-}
-
-.no-args {
-  .mixin();
-}
-
-.var-args {
-  @var: 9;
-  .mixin(@var, (@var * 2));
-}
-
-.multi-mix {
-  .mixin(2px, 30%);
-  .mixiny(4, 5);
-}
-
-.maxa(@arg1: 10, @arg2: #f00) {
-  padding: (@arg1 * 2px);
-  color: @arg2;
-}
-
-body {
-  .maxa(15);
-}
-
-@glob: 5;
-.global-mixin(@a:2) {
-  width: (@glob + @a);
-}
-
-.scope-mix {
-  .global-mixin(3);
-}
-
-.nested-ruleset (@width: 200px) {
-    width: @width;
-    .column { margin: @width; }
-}
-.content {
-    .nested-ruleset(600px);
-}
-
-//
-
-.same-var-name2(@radius) {
-  radius: @radius;
-}
-.same-var-name(@radius) {
-  .same-var-name2(@radius);
-}
-#same-var-name {
-  .same-var-name(5px);
-}
-
-//
-
-.var-inside () {
-    @var: 10px;
-    width: @var;
-}
-#var-inside { .var-inside; }
-
-.mixin-arguments (@width: 0px, ...) {
-    border: @arguments;
-    width: @width;
-}
-
-.arguments {
-    .mixin-arguments(1px, solid, black);
-}
-.arguments2 {
-    .mixin-arguments();
-}
-.arguments3 {
-    .mixin-arguments;
-}
-
-.mixin-arguments2 (@width, @rest...) {
-    border: @arguments;
-    rest: @rest;
-    width: @width;
-}
-.arguments4 {
-    .mixin-arguments2(0, 1, 2, 3, 4);
-}
-
-// Edge cases
-
-.edge-case {
-    .mixin-arguments("{");
-}
-
-// Division vs. Literal Slash
-.border-radius(@r: 2px/5px) {
-  border-radius: @r;
-}
-.slash-vs-math {
-  .border-radius();
-  .border-radius(5px/10px);
-  .border-radius((3px * 2));
-}
-// semi-colon vs comma for delimiting
-
-.mixin-takes-one(@a) {
-    one: @a;
-}
-
-.mixin-takes-two(@a; @b) {
-    one: @a;
-    two: @b;
-}
-
-.comma-vs-semi-colon {
-    .mixin-takes-two(@a : a; @b : b, c);
-    .mixin-takes-two(@a : d, e; @b : f);
-    .mixin-takes-one(@a: g);
-    .mixin-takes-one(@a : h;);
-    .mixin-takes-one(i);
-    .mixin-takes-one(j;);
-    .mixin-takes-two(k, l);
-    .mixin-takes-one(m, n;);
-    .mixin-takes-two(o, p; q);
-    .mixin-takes-two(r, s; t;);
-}
-
-.mixin-conflict(@a:defA, @b:defB, @c:defC) {
-  three: @a, @b, @c;
-}
-
-.mixin-conflict(@a:defA, @b:defB, @c:defC, @d:defD) {
-  four: @a, @b, @c, @d;
-}
-
-#named-conflict {
-  .mixin-conflict(11, 12, 13, @a:a);
-  .mixin-conflict(@a:a, 21, 22, 23);
-}
-@a: 3px;
-.mixin-default-arg(@a: 1px, @b: @a, @c: @b) {
-  defaults: 1px 1px 1px;
-  defaults: 2px 2px 2px;
-}
-
-.test-mixin-default-arg {
-  .mixin-default-arg();
-  .mixin-default-arg(2px);
-}
-
-.mixin-comma-default1(@color; @padding; @margin: 2, 2, 2, 2) {
-  margin: @margin;
-}
-.selector {
-  .mixin-comma-default1(#33acfe; 4);
-}
-.mixin-comma-default2(@margin: 2, 2, 2, 2;) {
-  margin: @margin;
-}
-.selector2 {
-  .mixin-comma-default2();
-}
-.mixin-comma-default3(@margin: 2, 2, 2, 2) {
-  margin: @margin;
-}
-.selector3 {
-  .mixin-comma-default3(4,2,2,2);
-}
-
-.test-calling-one-arg-mixin(@a) {
-}
-
-.test-calling-one-arg-mixin(@a, @b, @rest...) {
-}
-
-div {
-  .test-calling-one-arg-mixin(1);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins-closure.less b/test/Fixtures/lessjs (1.5)/less/mixins-closure.less
deleted file mode 100644
index 01251d2a..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins-closure.less	
+++ /dev/null
@@ -1,26 +0,0 @@
-.scope {
-    @var: 99px;
-    .mixin () {
-        width: @var;
-    }
-}
-
-.class {
-    .scope > .mixin;
-}
-
-.overwrite {
-    @var: 0px;
-    .scope > .mixin;
-}
-
-.nested {
-    @var: 5px;
-    .mixin () {
-        width: @var;    
-    }
-    .class {
-        @var: 10px;    
-       .mixin; 
-    }    
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins-guards.less b/test/Fixtures/lessjs (1.5)/less/mixins-guards.less
deleted file mode 100644
index 4d0774df..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins-guards.less	
+++ /dev/null
@@ -1,153 +0,0 @@
-
-// Stacking, functions..
-
-.light (@a) when (lightness(@a) > 50%) {
-  color: white;
-}
-.light (@a) when (lightness(@a) < 50%) {
-  color: black;
-}
-.light (@a) {
-  margin: 1px;
-}
-
-.light1 { .light(#ddd) }
-.light2 { .light(#444) }
-
-// Arguments against each other
-
-.max (@a, @b) when (@a > @b) {
-  width: @a;
-}
-.max (@a, @b) when (@a < @b) {
-  width: @b;
-}
-
-.max1 { .max(3, 6) }
-.max2 { .max(8, 1) }
-
-// Globals inside guards
-
-@g: auto;
-
-.glob (@a) when (@a = @g) {
-  margin: @a @g;
-}
-.glob1 { .glob(auto) }
-
-// Other operators
-
-.ops (@a) when (@a >= 0) {
-  height: gt-or-eq;
-}
-.ops (@a) when (@a =< 0) {
-  height: lt-or-eq;
-}
-.ops (@a) when (@a <= 0) {
-  height: lt-or-eq-alias;
-}
-.ops (@a) when not(@a = 0) {
-  height: not-eq;
-}
-.ops1 { .ops(0) }
-.ops2 { .ops(1) }
-.ops3 { .ops(-1) }
-
-// Scope and default values
-
-@a: auto;
-
-.default (@a: inherit) when (@a = inherit) {
-  content: default;
-}
-.default1 { .default }
-
-// true & false keywords
-.test (@a) when (@a) {
-    content: "true.";
-}
-.test (@a) when not (@a) {
-    content: "false.";
-}
-
-.test1 { .test(true) }
-.test2 { .test(false) }
-.test3 { .test(1) }
-.test4 { .test(boo) }
-.test5 { .test("true") }
-
-// Boolean expressions
-
-.bool () when (true) and (false)                             { content: true and false } // FALSE
-.bool () when (true) and (true)                              { content: true and true } // TRUE
-.bool () when (true)                                         { content: true } // TRUE
-.bool () when (false) and (false)                            { content: true } // FALSE
-.bool () when (false), (true)                                { content: false, true } // TRUE
-.bool () when (false) and (true) and (true),  (true)         { content: false and true and true, true } // TRUE
-.bool () when (true)  and (true) and (false), (false)        { content: true and true and false, false } // FALSE
-.bool () when (false), (true) and (true)                     { content: false, true and true } // TRUE
-.bool () when (false), (false), (true)                       { content: false, false, true } // TRUE
-.bool () when (false), (false) and (true), (false)           { content: false, false and true, false } // FALSE
-.bool () when (false), (true) and (true) and (true), (false) { content: false, true and true and true, false } // TRUE
-.bool () when not (false)                                    { content: not false }
-.bool () when not (true) and not (false)                     { content: not true and not false }
-.bool () when not (true) and not (true)                      { content: not true and not true }
-.bool () when not (false) and (false), not (false)           { content: not false and false, not false }
-
-.bool1 { .bool }
-
-.equality-unit-test(@num) when (@num = 1%) {
-  test: fail;
-}
-.equality-unit-test(@num) when (@num = 2) {
-  test: pass;
-}
-.equality-units {
-  .equality-unit-test(1px);
-  .equality-unit-test(2px);
-}
-
-.colorguard(@col) when (@col = red)							{ content: is @col; }
-.colorguard(@col) when not (blue = @col)					{ content: is not blue its @col; }
-.colorguard(@col)											{}
-.colorguardtest {
-    .colorguard(red);
-	.colorguard(blue);
-	.colorguard(purple);
-}
-
-.stringguard(@str) when (@str = "theme1")					{ content: is theme1; }
-.stringguard(@str) when not ("theme2" = @str)				{ content: is not theme2; }
-.stringguard(@str) when (~"theme1" = @str)					{ content: is theme1 no quotes; }
-.stringguard(@str)											{}
-.stringguardtest {
-    .stringguard("theme1");
-	.stringguard("theme2");
-	.stringguard(theme1);
-}
-
-.mixin(...) {
-  catch:all;
-}
-.mixin(@var) when (@var=4) {
-  declare: 4;
-}
-.mixin(@var) when (@var=4px) {
-  declare: 4px;
-}
-#tryNumberPx {
-  .mixin(4px);
-}
-
-.lock-mixin(@a) {
- .inner-locked-mixin(@x: @a) when (@a = 1) {
-    a: @a;
-    x: @x;
-  }
-}
-.call-lock-mixin {
-  .lock-mixin(1);
-  .call-inner-lock-mixin {
-    .inner-locked-mixin();
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins-important.less b/test/Fixtures/lessjs (1.5)/less/mixins-important.less
deleted file mode 100644
index c8cc1d5c..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins-important.less	
+++ /dev/null
@@ -1,25 +0,0 @@
-.submixin(@a) {
-  border-width: @a;
-}
-.mixin (9) {
-  border: 9 !important;  
-}
-.mixin (@a: 0) {
-  border: @a;
-  boxer: @a;
-  .inner {
-    test: @a;
-  }
-  // comment
-  .submixin(@a);
-}
-
-.class {
-  .mixin(1);
-  .mixin(2) !important;
-  .mixin(3);
-  .mixin(4) !important;
-  .mixin(5);
-  .mixin !important;
-  .mixin(9);
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins-named-args.less b/test/Fixtures/lessjs (1.5)/less/mixins-named-args.less
deleted file mode 100644
index d79e0f47..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins-named-args.less	
+++ /dev/null
@@ -1,36 +0,0 @@
-.mixin (@a: 1px, @b: 50%) {
-  width: (@a * 5);
-  height: (@b - 1%);
-  args: @arguments;
-}
-.mixin (@a: 1px, @b: 50%) when (@b > 75%){
-  text-align: center;
-}
- 
-.named-arg {
-  color: blue;
-  .mixin(@b: 100%);
-}
- 
-.class {
-  @var: 20%;
-  .mixin(@b: @var);
-}
-
-.all-args-wrong-args {
-  .mixin(@b: 10%, @a: 2px);
-}
-
-.mixin2 (@a: 1px, @b: 50%, @c: 50) {
-  width: (@a * 5);
-  height: (@b - 1%);
-  color: (#000000 + @c);
-}
-
-.named-args2 {
-  .mixin2(3px, @c: 100);
-}
-
-.named-args3 {
-  .mixin2(@b: 30%, @c: #123456);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins-nested.less b/test/Fixtures/lessjs (1.5)/less/mixins-nested.less
deleted file mode 100644
index 43443de2..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins-nested.less	
+++ /dev/null
@@ -1,22 +0,0 @@
-.mix-inner (@var) {
-  border-width: @var;
-}
-
-.mix (@a: 10) {
-  .inner {
-    height: (@a * 10);
-
-    .innest {
-      width: @a;  
-      .mix-inner((@a * 2));
-    }  
-  }
-}
-
-.class {
-  .mix(30);
-}
-
-.class2 {
-  .mix(60);
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins-pattern.less b/test/Fixtures/lessjs (1.5)/less/mixins-pattern.less
deleted file mode 100644
index f6a12ece..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins-pattern.less	
+++ /dev/null
@@ -1,99 +0,0 @@
-.mixin (...) {
-  variadic: true;
-}
-.mixin () {
-    zero: 0;
-}
-.mixin (@a: 1px) {
-    one: 1;
-}
-.mixin (@a) {
-    one-req: 1;
-}
-.mixin (@a: 1px, @b: 2px) {
-    two: 2;
-}
-
-.mixin (@a, @b, @c) {
-    three-req: 3;
-}
-
-.mixin (@a: 1px, @b: 2px, @c: 3px) {
-    three: 3;
-}
-
-.zero {
-    .mixin();
-}
-
-.one {
-    .mixin(1);
-}
-
-.two {
-    .mixin(1, 2);
-}
-
-.three {
-    .mixin(1, 2, 3);
-}
-
-//
-
-.mixout ('left') {
-    left: 1;
-}
-
-.mixout ('right') {
-    right: 1;
-}
-
-.left {
-    .mixout('left');
-}
-.right {
-    .mixout('right');
-}
-
-//
-
-.border (@side, @width) {
-    color: black;
-    .border-side(@side, @width);
-}
-.border-side (left, @w) {
-    border-left: @w;
-}
-.border-side (right, @w) {
-    border-right: @w;
-}
-
-.border-right {
-    .border(right, 4px);
-}
-.border-left {
-    .border(left, 4px);
-}
-
-//
-
-
-.border-radius (@r) {
-    both: (@r * 10);
-}
-.border-radius (@r, left) {
-    left: @r;
-}
-.border-radius (@r, right) {
-    right: @r;
-}
-
-.only-right {
-    .border-radius(33, right);
-}
-.only-left {
-    .border-radius(33, left);
-}
-.left-right {
-    .border-radius(33);
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/mixins.less b/test/Fixtures/lessjs (1.5)/less/mixins.less
deleted file mode 100644
index be9e2bbd..00000000
--- a/test/Fixtures/lessjs (1.5)/less/mixins.less	
+++ /dev/null
@@ -1,141 +0,0 @@
-.mixin { border: 1px solid black; }
-.mixout { border-color: orange; }
-.borders { border-style: dashed; }
-
-#namespace {
-  .borders {
-    border-style: dotted;
-  }
-  .biohazard {
-    content: "death";
-    .man {
-      color: transparent;
-    }
-  }
-}
-#theme {
-  > .mixin {
-    background-color: grey;
-  }
-}
-#container {
-  color: black;
-  .mixin;
-  .mixout;
-  #theme > .mixin;
-}
-
-#header {
-  .milk {
-    color: white;
-    .mixin;
-    #theme > .mixin;
-  }
-  #cookie {
-    .chips {
-      #namespace .borders;
-      .calories {
-        #container;
-      }
-    }
-    .borders;
-  }
-}
-.secure-zone { #namespace .biohazard .man; }
-.direct {
-  #namespace > .borders;
-}
-
-.bo, .bar {
-    width: 100%;
-}
-.bo {
-    border: 1px;
-}
-.ar.bo.ca {
-    color: black;
-}
-.jo.ki {
-    background: none;
-}
-.amp {
-    &.support {
-        color: orange;
-        .higher {
-            top: 0px;
-        }
-        &.deeper {
-            height: auto;
-        }
-    }
-}
-.extended {
-    .bo;
-    .jo.ki;
-    .amp.support;
-    .amp.support.higher;
-    .amp.support.deeper;
-}
-.do .re .mi .fa {
-    .sol .la {
-        .si {
-            color: cyan;
-        }
-    }
-}
-.mutli-selector-parents {
-    .do.re.mi.fa.sol.la.si;
-}
-.foo .bar {
-  .bar;
-}
-.has_parents() {
-  & .underParents {
-    color: red;
-  }
-}
-.has_parents();
-.parent {
-  .has_parents();
-}
-.margin_between(@above, @below) {
-     * + & { margin-top: @above; }
-     legend + & { margin-top: 0; }
-     & + * { margin-top: @below; }
-}
-h1 { .margin_between(25px, 10px); }
-h2 { .margin_between(20px, 8px); }
-h3 { .margin_between(15px, 5px); }
-
-.mixin_def(@url, @position){
-    background-image: @url;
-    background-position: @position;
-}
-.error{
-  @s: "/";
-  .mixin_def( "@{s}a.png", center center);
-}
-.recursion() {
-  color: black;
-}
-.test-rec {
-  .recursion {
-    .recursion();
-  }
-}
-.paddingFloat(@padding) { padding-left: @padding; }
-
-.button { 
-    .paddingFloat(((10px + 12) * 2));
-
-    &.large { .paddingFloat(((10em * 2) * 2)); }
-}
-.clearfix() {
-  // ...
-}
-.clearfix {
-  .clearfix();
-}
-.foo {
-  .clearfix();
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/no-js-errors/no-js-errors.less b/test/Fixtures/lessjs (1.5)/less/no-js-errors/no-js-errors.less
deleted file mode 100644
index 15ef8a45..00000000
--- a/test/Fixtures/lessjs (1.5)/less/no-js-errors/no-js-errors.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: `1 + 1`;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/no-js-errors/no-js-errors.txt b/test/Fixtures/lessjs (1.5)/less/no-js-errors/no-js-errors.txt
deleted file mode 100644
index d81dd2bd..00000000
--- a/test/Fixtures/lessjs (1.5)/less/no-js-errors/no-js-errors.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: You are using JavaScript, which has been disabled. in {path}no-js-errors.less on line 2, column 6:
-1 .a {
-2   a: `1 + 1`;
-3 }
diff --git a/test/Fixtures/lessjs (1.5)/less/no-output.less b/test/Fixtures/lessjs (1.5)/less/no-output.less
deleted file mode 100644
index b4e6a499..00000000
--- a/test/Fixtures/lessjs (1.5)/less/no-output.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-.mixin() {
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/operations.less b/test/Fixtures/lessjs (1.5)/less/operations.less
deleted file mode 100644
index 3e483c8b..00000000
--- a/test/Fixtures/lessjs (1.5)/less/operations.less	
+++ /dev/null
@@ -1,62 +0,0 @@
-#operations {
-  color: (#110000 + #000011 + #001100); // #111111
-  height: (10px / 2px + 6px - 1px * 2); // 9px
-  width: (2 * 4 - 5em); // 3em
-  .spacing {
-    height: (10px / 2px+6px-1px*2);
-    width: (2  * 4-5em);
-  }
-  substraction: (20 - 10 - 5 - 5); // 0
-  division: (20 / 5 / 4); // 1
-}
-
-@x: 4;
-@y: 12em;
-
-.with-variables {
-  height: (@x + @y); // 16em
-  width: (12 + @y); // 24em
-  size: (5cm - @x); // 1cm
-}
-
-.with-functions {
-  color: (rgb(200, 200, 200) / 2);
-  color: (2 * hsl(0, 50%, 50%));
-  color: (rgb(10, 10, 10) + hsl(0, 50%, 50%));
-}
-
-@z: -2;
-
-.negative {
-  height: (2px + @z); // 0px
-  width: (2px - @z); // 4px
-}
-
-.shorthands {
-  padding: -1px 2px 0 -4px; //
-}
-
-.rem-dimensions {
-  font-size: (20rem / 5 + 1.5rem); // 5.5rem
-}
-
-.colors {
-  color: #123; // #112233
-  border-color: (#234 + #111111); // #334455
-  background-color: (#222222 - #fff); // #000000
-  .other {
-    color: (2 * #111); // #222222
-    border-color: (#333333 / 3 + #111); // #222222
-  }
-}
-
-.negations {
-    @var: 4px;
-    variable: (-@var); // 4
-    variable1: (-@var + @var); // 0
-    variable2: (@var + -@var); // 0
-    variable3: (@var - -@var); // 8
-    variable4: (-@var - -@var); // 0
-    paren: (-(@var)); // -4px
-    paren2: (-(2 + 2) * -@var); // 16
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/parens.less b/test/Fixtures/lessjs (1.5)/less/parens.less
deleted file mode 100644
index deb41391..00000000
--- a/test/Fixtures/lessjs (1.5)/less/parens.less	
+++ /dev/null
@@ -1,41 +0,0 @@
-.parens {
-  @var: 1px;
-  border: (@var * 2) solid black;
-  margin: (@var * 1) (@var + 2) (4 * 4) 3;
-  width: (6 * 6);
-  padding: 2px (6 * 6px);
-}
-
-.more-parens {
-  @var: (2 * 2);
-  padding: (2 * @var) 4 4 (@var * 1px);
-  width-all: ((@var * @var) * 6);
-  width-first: ((@var * @var)) * 6;
-  width-keep: (@var * @var) * 6;
-  height-keep: (7 * 7) + (8 * 8);
-  height-all: ((7 * 7) + (8 * 8));
-  height-parts: ((7 * 7)) + ((8 * 8));
-  margin-keep: (4 * (5 + 5) / 2) - (@var * 2);
-  margin-parts: ((4 * (5 + 5) / 2)) - ((@var * 2));
-  margin-all: ((4 * (5 + 5) / 2) + (-(@var * 2)));
-  border-radius-keep: 4px * (1 + 1) / @var + 3px;
-  border-radius-parts: ((4px * (1 + 1))) / ((@var + 3px));
-  border-radius-all: (4px * (1 + 1) / @var + 3px);
-  //margin: (6 * 6)px;
-}
-
-.negative {
-  @var: 1;
-  neg-var: -@var; // -1 ?
-  neg-var-paren: -(@var); // -(1) ?
-}
-
-.nested-parens {
-  width: 2 * (4 * (2 + (1 + 6))) - 1;
-  height: ((2 + 3) * (2 + 3) / (9 - 4)) + 1;
-}
-
-.mixed-units {
-  margin: 2px 4em 1 5pc;
-  padding: (2px + 4px) 1em 2px 2;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/rulesets.less b/test/Fixtures/lessjs (1.5)/less/rulesets.less
deleted file mode 100644
index e81192db..00000000
--- a/test/Fixtures/lessjs (1.5)/less/rulesets.less	
+++ /dev/null
@@ -1,30 +0,0 @@
-#first > .one {
-  > #second .two > #deux {
-    width: 50%;
-    #third {
-      &:focus {
-        color: black;
-        #fifth {
-          > #sixth {
-            .seventh #eighth {
-              + #ninth {
-                color: purple;
-              }
-            }
-          }
-        }
-      }
-      height: 100%;
-    }
-    #fourth, #five, #six {
-      color: #110000;
-      .seven, .eight > #nine {
-        border: 1px solid black;
-      }
-      #ten {
-        color: red;
-      }
-    }
-  }
-  font-size: 2em;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/scope.less b/test/Fixtures/lessjs (1.5)/less/scope.less
deleted file mode 100644
index 36d37061..00000000
--- a/test/Fixtures/lessjs (1.5)/less/scope.less	
+++ /dev/null
@@ -1,79 +0,0 @@
-@x: red;
-@x: blue;
-@z: transparent;
-@mix: none;
-
-.mixin {
-  @mix: #989;
-}
-@mix: blue;
-.tiny-scope {
-  color: @mix; // #989
-  .mixin;
-}
-
-.scope1 {
-  @y: orange;
-  @z: black;
-  color: @x; // blue
-  border-color: @z; // black
-  .hidden {
-    @x: #131313;
-  }
-  .scope2 {
-    @y: red;
-    color: @x; // blue
-    .scope3 {
-      @local: white;
-      color: @y; // red
-      border-color: @z; // black
-      background-color: @local; // white
-    }
-  }
-}
-
-#namespace {
-  .scoped_mixin() {
-    @local-will-be-made-global: green;
-    .scope {
-      scoped-val: @local-will-be-made-global;
-	}
-  }
-}
-
-#namespace > .scoped_mixin();
-
-.setHeight(@h) { @height: 1024px; }
-.useHeightInMixinCall(@h) { .useHeightInMixinCall { mixin-height: @h; } }
-@mainHeight: 50%;
-.setHeight(@mainHeight);
-.heightIsSet { height: @height; }
-.useHeightInMixinCall(@height);
-
-.importRuleset() {
-  .imported {
-    exists: true;
-  }
-}
-.importRuleset();
-.testImported {
-  .imported;
-}
-
-@parameterDefault: 'top level';
-@anotherVariable: 'top level';
-//mixin uses top-level variables
-.mixinNoParam(@parameter: @parameterDefault) when (@parameter = 'top level') {
-  default: @parameter;
-  scope: @anotherVariable;
-  sub-scope-only: @subScopeOnly;
-}
-
-#allAreUsedHere {
-  //redefine top-level variables in different scope
-  @parameterDefault: 'inside';
-  @anotherVariable: 'inside';
-  @subScopeOnly: 'inside';
-  //use the mixin
-  .mixinNoParam();
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/selectors.less b/test/Fixtures/lessjs (1.5)/less/selectors.less
deleted file mode 100644
index ed7db7ce..00000000
--- a/test/Fixtures/lessjs (1.5)/less/selectors.less	
+++ /dev/null
@@ -1,144 +0,0 @@
-h1, h2, h3 {
-  a, p {
-    &:hover {
-      color: red;
-    }
-  }
-}
-
-#all { color: blue; }
-#the { color: blue; }
-#same { color: blue; }
-
-ul, li, div, q, blockquote, textarea {
-  margin: 0;
-}
-
-td {
-  margin: 0;
-  padding: 0;
-}
-
-td, input {
-  line-height: 1em;
-}
-
-a {
-  color: red;
-
-  &:hover { color: blue; }
-
-  div & { color: green; }
-
-  p & span { color: yellow; }
-}
-
-.foo {
-  .bar, .baz {
-    & .qux {
-      display: block;
-    }
-    .qux & {
-      display: inline;
-    }
-	.qux& {
-	  display: inline-block;
-	}
-    .qux & .biz {
-      display: none;
-    }
-  }
-}
-
-.b {
- &.c {
-  .a& {
-   color: red;
-  }
- }
-}
-
-.b {
- .c & {
-  &.a {
-   color: red;
-  }
- }
-}
-
-.p {
-  .foo &.bar {
-    color: red;
-  }
-}
-
-.p {
-  .foo&.bar {
-    color: red;
-  }
-}
-
-.foo {
-  .foo + & {
-    background: amber;
-  }
-  & + & {
-    background: amber;
-  }
-}
-
-.foo, .bar {
-  & + & {
-    background: amber;
-  }
-}
-
-.foo, .bar {
-  a, b {
-    & > & {
-      background: amber;
-    }
-  }
-}
-
-.other ::fnord { color: red }
-.other::fnord { color: red }
-.other {
-  ::bnord {color: red }
-  &::bnord {color: red }
-}
-// selector interpolation
-@theme: blood;
-@selector: ~".@{theme}";
-@{selector} {
-  color:red;
-}
-@{selector}red {
-  color: green;
-}
-.red {
-  #@{theme}.@{theme}&.black {
-    color:black;
-  }
-}
-@num: 3;
-:nth-child(@{num}) {
-	selector: interpolated;
-}
-.test {
-  &:nth-child(odd):not(:nth-child(3)) {
-    color: #ff0000;
-  }
-}
-[prop],
-[prop=10%],
-[prop="value@{num}"],
-[prop*="val@{num}"],
-[|prop~="val@{num}"],
-[*|prop$="val@{num}"],
-[ns|prop^="val@{num}"],
-[@{num}^="val@{num}"],
-[@{num}=@{num}],
-[@{num}] {
-  attributes: yes;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/sourcemaps/basic.less b/test/Fixtures/lessjs (1.5)/less/sourcemaps/basic.less
deleted file mode 100644
index 4ee8b4f6..00000000
--- a/test/Fixtures/lessjs (1.5)/less/sourcemaps/basic.less	
+++ /dev/null
@@ -1,27 +0,0 @@
-@var: black;
-
-.a() {
-  color: red;
-}
-
-.b {
-  color: green;
-  .a();
-  color: blue;
-  background: @var;
-}
-
-.a, .b {
-  background: green;
-  .c, .d {
-    background: gray;
-    & + & {
-      color: red;
-    }
-  }
-}
-
-.extend:extend(.a all) {
-  color: pink;
-}
-@import (inline) "imported.css";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/sourcemaps/imported.css b/test/Fixtures/lessjs (1.5)/less/sourcemaps/imported.css
deleted file mode 100644
index 2ee35f06..00000000
--- a/test/Fixtures/lessjs (1.5)/less/sourcemaps/imported.css	
+++ /dev/null
@@ -1,7 +0,0 @@
-/*comments*/
-.unused-css {
-    color: white;
-}
-.imported {
-    color: black;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.5)/less/static-urls/urls.less b/test/Fixtures/lessjs (1.5)/less/static-urls/urls.less
deleted file mode 100644
index b0c7de09..00000000
--- a/test/Fixtures/lessjs (1.5)/less/static-urls/urls.less	
+++ /dev/null
@@ -1,33 +0,0 @@
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium),
-       url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-}
-
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-    @a: 'Trebuchet';
-    url: url(@a);
-}
-
-@import "../import/import-and-relative-paths-test";
diff --git a/test/Fixtures/lessjs (1.5)/less/strings.less b/test/Fixtures/lessjs (1.5)/less/strings.less
deleted file mode 100644
index c43e368d..00000000
--- a/test/Fixtures/lessjs (1.5)/less/strings.less	
+++ /dev/null
@@ -1,57 +0,0 @@
-#strings {
-  background-image: url("http://son-of-a-banana.com");
-  quotes: "~" "~";
-  content: "#*%:&^,)!.(~*})";
-  empty: "";
-  brackets: "{" "}";
-  escapes: "\"hello\" \\world";
-  escapes2: "\"llo";
-}
-#comments {
-  content: "/* hello */ // not-so-secret";
-}
-#single-quote {
-  quotes: "'" "'";
-  content: '""#!&""';
-  empty: '';
-  semi-colon: ';';
-}
-#escaped {
-  filter: ~"DX.Transform.MS.BS.filter(opacity=50)";
-}
-#one-line { image: url(http://tooks.com) }
-#crazy { image: url(http://), "}", url("http://}") }
-#interpolation {
-  @var: '/dev';
-  url: "http://lesscss.org@{var}/image.jpg";
-
-  @var2: 256;
-  url2: "http://lesscss.org/image-@{var2}.jpg";
-
-  @var3: #456;
-  url3: "http://lesscss.org@{var3}";
-
-  @var4: hello;
-  url4: "http://lesscss.org/@{var4}";
-
-  @var5: 54.4px;
-  url5: "http://lesscss.org/@{var5}";
-}
-
-// multiple calls with string interpolation
-
-.mix-mul (@a: green) {
-    color: ~"@{a}";
-}
-.mix-mul-class {
-    .mix-mul(blue);
-    .mix-mul(red);
-    .mix-mul(black);
-    .mix-mul(orange);
-}
-
-@test: Arial, Verdana, San-Serif;
-.watermark {
-  @family: ~"Univers, @{test}";
-  family: @family;
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/urls.less b/test/Fixtures/lessjs (1.5)/less/urls.less
deleted file mode 100644
index 5ef87635..00000000
--- a/test/Fixtures/lessjs (1.5)/less/urls.less	
+++ /dev/null
@@ -1,67 +0,0 @@
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium),
-       url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-  background: url("img.jpg") center / 100px;
-  background: #fff url(image.png) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700");
-}
-
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-    @a: 'Trebuchet';
-    url: url(@a);
-}
-
-@import "import/import-and-relative-paths-test";
-
-#data-uri {
-  uri: data-uri('image/jpeg;base64', '../data/image.jpg');
-}
-
-#data-uri-guess {
-  uri: data-uri('../data/image.jpg');
-}
-
-#data-uri-ascii {
-  uri-1: data-uri('text/html', '../data/page.html');
-  uri-2: data-uri('../data/page.html');
-}
-
-#data-uri-toobig {
-  uri: data-uri('../data/data-uri-fail.png');
-}
-.add_an_import(@file_to_import) {
-@import "@{file_to_import}";
-}
-
-.add_an_import("file.css");
-
-#svg-functions {
-  background-image: svg-gradient(to bottom, black, white);
-  background-image: svg-gradient(to bottom, black, orange 3%, white);
-  @green_5: green 5%;
-  @orange_percentage: 3%;
-  @orange_color: orange;
-  background-image: svg-gradient(to bottom, (mix(black, white) + #444) 1%, @orange_color @orange_percentage, ((@green_5)), white 95%);
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/variables.less b/test/Fixtures/lessjs (1.5)/less/variables.less
deleted file mode 100644
index e896f404..00000000
--- a/test/Fixtures/lessjs (1.5)/less/variables.less	
+++ /dev/null
@@ -1,83 +0,0 @@
-@a: 2;
-@x: (@a * @a);
-@y: (@x + 1);
-@z: (@x * 2 + @y);
-@var: -1;
-
-.variables {
-  width: (@z + 1cm); // 14cm
-}
-
-@b: @a * 10;
-@c: #888;
-
-@fonts: "Trebuchet MS", Verdana, sans-serif;
-@f: @fonts;
-
-@quotes: "~" "~";
-@q: @quotes;
-@onePixel: 1px;
-
-.variables {
-  height: (@b + @x + 0px); // 24px
-  color: @c;
-  font-family: @f;
-  quotes: @q;
-}
-
-.redef {
-    @var: 0;
-	.inition {
-		@var: 4;
-		@var: 2;
-		three: @var;
-		@var: 3;
-	}
-	zero: @var;
-}
-
-.values {
-	minus-one: @var;
-    @a: 'Trebuchet';
-    @multi: 'A', B, C;
-    font-family: @a, @a, @a;
-    color: @c !important;
-    multi: something @multi, @a;
-}
-
-.variable-names {
-    @var: 'hello';
-    @name: 'var';
-    name: @@name;
-}
-
-.alpha {
-    @var: 42;
-    filter: alpha(opacity=@var);
-}
-
-.polluteMixin() {
-    @a: 'pollution';
-}
-.testPollution {
-    @a: 'no-pollution';
-    a: @a;
-	.polluteMixin();
-	a: @a;
-}
-
-.units {
-  width: @onePixel;
-  same-unit-as-previously: (@onePixel / @onePixel);
-  square-pixel-divided: (@onePixel * @onePixel / @onePixel);
-  odd-unit: unit((@onePixel * 4em / 2cm));
-  percentage: (10 * 50%);
-  pixels: (50px * 10);
-  conversion-metric-a: (20mm + 1cm);
-  conversion-metric-b: (1cm + 20mm);
-  conversion-imperial: (1in + 72pt + 6pc);
-  custom-unit: (42octocats * 10);
-  custom-unit-cancelling: (8cats * 9dogs / 4cats);
-  mix-units: (1px + 1em);
-  invalid-units: (1px * 1px);
-}
diff --git a/test/Fixtures/lessjs (1.5)/less/whitespace.less b/test/Fixtures/lessjs (1.5)/less/whitespace.less
deleted file mode 100644
index ab4804da..00000000
--- a/test/Fixtures/lessjs (1.5)/less/whitespace.less	
+++ /dev/null
@@ -1,44 +0,0 @@
-
-
-.whitespace
-  { color: white; }  
-  
-.whitespace
-{
-  color: white;
-}
-  .whitespace
-{ color: white; }
-
-.whitespace{color:white;}  
-.whitespace { color : white ; }
-
-.white,
-.space,
-.mania
-{ color: white; }
-
-.no-semi-column { color: white }
-.no-semi-column {
-  color: white;
-  white-space: pre
-}
-.no-semi-column {border: 2px solid white}
-.newlines {
-  background: the,
-              great,
-              wall;
-  border: 2px
-          solid
-          black;
-}
-.empty {
-  
-}
-.sel
-.newline_ws	.tab_ws	{
-color:
-white;
-background-position: 45
--23;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/charsets.css b/test/Fixtures/lessjs (1.6)/css/charsets.css
deleted file mode 100644
index 9f44090c..00000000
--- a/test/Fixtures/lessjs (1.6)/css/charsets.css	
+++ /dev/null
@@ -1 +0,0 @@
-@charset "UTF-8";
diff --git a/test/Fixtures/lessjs (1.6)/css/colors.css b/test/Fixtures/lessjs (1.6)/css/colors.css
deleted file mode 100644
index 08a22abb..00000000
--- a/test/Fixtures/lessjs (1.6)/css/colors.css	
+++ /dev/null
@@ -1,87 +0,0 @@
-#yelow #short {
-  color: #fea;
-}
-#yelow #long {
-  color: #ffeeaa;
-}
-#yelow #rgba {
-  color: rgba(255, 238, 170, 0.1);
-}
-#yelow #argb {
-  color: #1affeeaa;
-}
-#blue #short {
-  color: #00f;
-}
-#blue #long {
-  color: #0000ff;
-}
-#blue #rgba {
-  color: rgba(0, 0, 255, 0.1);
-}
-#blue #argb {
-  color: #1a0000ff;
-}
-#alpha #hsla {
-  color: rgba(61, 45, 41, 0.6);
-}
-#overflow .a {
-  color: #000000;
-}
-#overflow .b {
-  color: #ffffff;
-}
-#overflow .c {
-  color: #ffffff;
-}
-#overflow .d {
-  color: #00ff00;
-}
-#overflow .e {
-  color: rgba(0, 31, 255, 0.42);
-}
-#grey {
-  color: #c8c8c8;
-}
-#333333 {
-  color: #333333;
-}
-#808080 {
-  color: #808080;
-}
-#00ff00 {
-  color: #00ff00;
-}
-.lightenblue {
-  color: #3333ff;
-}
-.darkenblue {
-  color: #0000cc;
-}
-.unknowncolors {
-  color: blue2;
-  border: 2px solid superred;
-}
-.transparent {
-  color: transparent;
-  background-color: rgba(0, 0, 0, 0);
-}
-#alpha #fromvar {
-  opacity: 0.7;
-}
-#alpha #short {
-  opacity: 1;
-}
-#alpha #long {
-  opacity: 1;
-}
-#alpha #rgba {
-  opacity: 0.2;
-}
-#alpha #hsl {
-  opacity: 1;
-}
-#percentage {
-  color: 255;
-  border-color: rgba(255, 0, 0, 0.5);
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/comments.css b/test/Fixtures/lessjs (1.6)/css/comments.css
deleted file mode 100644
index b85f5b4f..00000000
--- a/test/Fixtures/lessjs (1.6)/css/comments.css	
+++ /dev/null
@@ -1,69 +0,0 @@
-/******************\
-*                  *
-*  Comment Header  *
-*                  *
-\******************/
-/*
-
-    Comment
-
-*/
-/*
- * Comment Test
- *
- * - cloudhead (http://cloudhead.net)
- *
- */
-/* Colors
- * ------
- *   #EDF8FC (background blue)
- *   #166C89 (darkest blue)
- *
- * Text:
- *   #333 (standard text) // A comment within a comment!
- *   #1F9EC9 (standard link)
- *
- */
-/* @group Variables
-------------------- */
-#comments,
-.comments {
-  /**/
-  color: red;
-  /* A C-style comment */
-  /* A C-style comment */
-  background-color: orange;
-  font-size: 12px;
-  /* lost comment */
-  content: "content";
-  border: 1px solid black;
-  padding: 0;
-  margin: 2em;
-}
-/* commented out
-  #more-comments {
-    color: grey;
-  }
-*/
-.selector,
-.lots,
-.comments {
-  color: #808080, /* blue */ #ffa500;
-  -webkit-border-radius: 2px /* webkit only */;
-  -moz-border-radius: 8px /* moz only with operation */;
-}
-.test {
-  color: 1px;
-}
-#last {
-  color: #0000ff;
-}
-/*  */
-/* { */
-/*  */
-/*  */
-/*  */
-#div {
-  color: #A33;
-}
-/* } */
diff --git a/test/Fixtures/lessjs (1.6)/css/compression/compression.css b/test/Fixtures/lessjs (1.6)/css/compression/compression.css
deleted file mode 100644
index f9cc90a3..00000000
--- a/test/Fixtures/lessjs (1.6)/css/compression/compression.css	
+++ /dev/null
@@ -1,3 +0,0 @@
-#colours{color1:#fea;color2:#fea;color3:rgba(255,238,170,0.1);string:"#ffeeaa";/*! but not this type
-      Note preserved whitespace
-  */}dimensions{val:.1px;val:0;val:4cm;val:.2;val:5;angles-must-have-unit:0deg;durations-must-have-unit:0s;length-doesnt-have-unit:0;width:auto\9}@page{marks:none;@top-left-corner{vertical-align:top}@top-left{vertical-align:top}}.shadow^.dom,body^^.shadow{display:done}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/css/css-3.css b/test/Fixtures/lessjs (1.6)/css/css-3.css
deleted file mode 100644
index 61f635c2..00000000
--- a/test/Fixtures/lessjs (1.6)/css/css-3.css	
+++ /dev/null
@@ -1,129 +0,0 @@
-.comma-delimited {
-  text-shadow: -1px -1px 1px #ff0000, 6px 5px 5px #ffff00;
-  -moz-box-shadow: 0pt 0pt 2px rgba(255, 255, 255, 0.4) inset, 0pt 4px 6px rgba(255, 255, 255, 0.4) inset;
-  -webkit-transform: rotate(0deg);
-}
-@font-face {
-  font-family: Headline;
-  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
-}
-.other {
-  -moz-transform: translate(0, 11em) rotate(-90deg);
-  transform: rotateX(45deg);
-}
-.item[data-cra_zy-attr1b-ut3=bold] {
-  font-weight: bold;
-}
-p:not([class*="lead"]) {
-  color: black;
-}
-input[type="text"].class#id[attr=32]:not(1) {
-  color: white;
-}
-div#id.class[a=1][b=2].class:not(1) {
-  color: white;
-}
-ul.comma > li:not(:only-child)::after {
-  color: white;
-}
-ol.comma > li:nth-last-child(2)::after {
-  color: white;
-}
-li:nth-child(4n+1),
-li:nth-child(-5n),
-li:nth-child(-n+2) {
-  color: white;
-}
-a[href^="http://"] {
-  color: black;
-}
-a[href$="http://"] {
-  color: black;
-}
-form[data-disabled] {
-  color: black;
-}
-p::before {
-  color: black;
-}
-#issue322 {
-  -webkit-animation: anim2 7s infinite ease-in-out;
-}
-@-webkit-keyframes frames {
-  0% {
-    border: 1px;
-  }
-  5.5% {
-    border: 2px;
-  }
-  100% {
-    border: 3px;
-  }
-}
-@keyframes fontbulger1 {
-  to {
-    font-size: 15px;
-  }
-  from,
-  to {
-    font-size: 12px;
-  }
-  0%,
-  100% {
-    font-size: 12px;
-  }
-}
-.units {
-  font: 1.2rem/2rem;
-  font: 8vw/9vw;
-  font: 10vh/12vh;
-  font: 12vm/15vm;
-  font: 12vmin/15vmin;
-  font: 1.2ch/1.5ch;
-}
-@supports ( box-shadow: 2px 2px 2px black ) or
-          ( -moz-box-shadow: 2px 2px 2px black ) {
-  .outline {
-    box-shadow: 2px 2px 2px black;
-    -moz-box-shadow: 2px 2px 2px black;
-  }
-}
-@-x-document url-prefix(""github.com"") {
-  h1 {
-    color: red;
-  }
-}
-@viewport {
-  font-size: 10px;
-}
-@namespace foo url(http://www.example.com);
-foo|h1 {
-  color: blue;
-}
-foo|* {
-  color: yellow;
-}
-|h1 {
-  color: red;
-}
-*|h1 {
-  color: green;
-}
-h1 {
-  color: green;
-}
-.upper-test {
-  UpperCaseProperties: allowed;
-}
-@host {
-  div {
-    display: block;
-  }
-}
-::distributed(input::placeholder) {
-  color: #b3b3b3;
-}
-.shadow ^ .dom,
-body ^^ .shadow {
-  display: done;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/css-escapes.css b/test/Fixtures/lessjs (1.6)/css/css-escapes.css
deleted file mode 100644
index 4d343aa6..00000000
--- a/test/Fixtures/lessjs (1.6)/css/css-escapes.css	
+++ /dev/null
@@ -1,24 +0,0 @@
-.escape\|random\|char {
-  color: red;
-}
-.mixin\!tUp {
-  font-weight: bold;
-}
-.\34 04 {
-  background: red;
-}
-.\34 04 strong {
-  color: #ff00ff;
-  font-weight: bold;
-}
-.trailingTest\+ {
-  color: red;
-}
-/* This hideous test of hideousness checks for the selector "blockquote" with various permutations of hex escapes */
-\62\6c\6f \63 \6B \0071 \000075o\74 e {
-  color: silver;
-}
-[ng\:cloak],
-ng\:form {
-  display: none;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/css-guards.css b/test/Fixtures/lessjs (1.6)/css/css-guards.css
deleted file mode 100644
index f4b8a108..00000000
--- a/test/Fixtures/lessjs (1.6)/css/css-guards.css	
+++ /dev/null
@@ -1,37 +0,0 @@
-.light {
-  color: green;
-}
-.see-the {
-  color: green;
-}
-.hide-the {
-  color: green;
-}
-.multiple-conditions-1 {
-  color: red;
-}
-.inheritance .test {
-  color: black;
-}
-.inheritance:hover {
-  color: pink;
-}
-.clsWithGuard {
-  dispaly: none;
-}
-.dont-split-me-up {
-  width: 1px;
-  color: red;
-  height: 1px;
-}
- + .dont-split-me-up {
-  sibling: true;
-}
-.scope-check {
-  sub-prop: 2px;
-  prop: 1px;
-}
-.scope-check-2 {
-  sub-prop: 2px;
-  prop: 1px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/css.css b/test/Fixtures/lessjs (1.6)/css/css.css
deleted file mode 100644
index b011a7e3..00000000
--- a/test/Fixtures/lessjs (1.6)/css/css.css	
+++ /dev/null
@@ -1,95 +0,0 @@
-@charset "utf-8";
-div {
-  color: black;
-}
-div {
-  width: 99%;
-}
-* {
-  min-width: 45em;
-}
-h1,
-h2 > a > p,
-h3 {
-  color: none;
-}
-div.class {
-  color: blue;
-}
-div#id {
-  color: green;
-}
-.class#id {
-  color: purple;
-}
-.one.two.three {
-  color: grey;
-}
-@media print {
-  * {
-    font-size: 3em;
-  }
-}
-@media screen {
-  * {
-    font-size: 10px;
-  }
-}
-@font-face {
-  font-family: 'Garamond Pro';
-}
-a:hover,
-a:link {
-  color: #999;
-}
-p,
-p:first-child {
-  text-transform: none;
-}
-q:lang(no) {
-  quotes: none;
-}
-p + h1 {
-  font-size: 2.2em;
-}
-#shorthands {
-  border: 1px solid #000;
-  font: 12px/16px Arial;
-  font: 100%/16px Arial;
-  margin: 1px 0;
-  padding: 0 auto;
-}
-#more-shorthands {
-  margin: 0;
-  padding: 1px 0 2px 0;
-  font: normal small / 20px 'Trebuchet MS', Verdana, sans-serif;
-  font: 0/0 a;
-  border-radius: 5px / 10px;
-}
-.misc {
-  -moz-border-radius: 2px;
-  display: -moz-inline-stack;
-  width: .1em;
-  background-color: #009998;
-  background: -webkit-gradient(linear, left top, left bottom, from(#ff0000), to(#0000ff));
-  margin: ;
-  filter: alpha(opacity=100);
-  width: auto\9;
-}
-.misc .nested-multiple {
-  multiple-semi-colons: yes;
-}
-#important {
-  color: red !important;
-  width: 100%!important;
-  height: 20px ! important;
-}
-@font-face {
-  font-family: font-a;
-}
-@font-face {
-  font-family: font-b;
-}
-.æøå {
-  margin: 0;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-all.css b/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-all.css
deleted file mode 100644
index bf156312..00000000
--- a/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-all.css	
+++ /dev/null
@@ -1,49 +0,0 @@
-@charset "UTF-8";
-/* line 3, {pathimport}test.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000033}}
-/* @charset "ISO-8859-1"; */
-/* line 23, {pathimport}test.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000323}}
-.tst3 {
-  color: grey;
-}
-/* line 15, {path}linenumbers.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\0000315}}
-.test1 {
-  color: black;
-}
-/* line 6, {path}linenumbers.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\000036}}
-.test2 {
-  color: red;
-}
-@media all {
-  /* line 5, {pathimport}test.less */
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000035}}
-  .tst {
-    color: black;
-  }
-}
-@media all and screen {
-  /* line 7, {pathimport}test.less */
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000037}}
-  .tst {
-    color: red;
-  }
-  /* line 9, {pathimport}test.less */
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000039}}
-  .tst .tst3 {
-    color: white;
-  }
-}
-/* line 18, {pathimport}test.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000318}}
-.tst2 {
-  color: white;
-}
-/* line 27, {path}linenumbers.less */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\0000327}}
-.test {
-  color: red;
-  width: 2;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-comments.css b/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-comments.css
deleted file mode 100644
index ddeb0c4d..00000000
--- a/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-comments.css	
+++ /dev/null
@@ -1,40 +0,0 @@
-@charset "UTF-8";
-/* line 3, {pathimport}test.less */
-/* @charset "ISO-8859-1"; */
-/* line 23, {pathimport}test.less */
-.tst3 {
-  color: grey;
-}
-/* line 15, {path}linenumbers.less */
-.test1 {
-  color: black;
-}
-/* line 6, {path}linenumbers.less */
-.test2 {
-  color: red;
-}
-@media all {
-  /* line 5, {pathimport}test.less */
-  .tst {
-    color: black;
-  }
-}
-@media all and screen {
-  /* line 7, {pathimport}test.less */
-  .tst {
-    color: red;
-  }
-  /* line 9, {pathimport}test.less */
-  .tst .tst3 {
-    color: white;
-  }
-}
-/* line 18, {pathimport}test.less */
-.tst2 {
-  color: white;
-}
-/* line 27, {path}linenumbers.less */
-.test {
-  color: red;
-  width: 2;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-mediaquery.css b/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-mediaquery.css
deleted file mode 100644
index 9d272f47..00000000
--- a/test/Fixtures/lessjs (1.6)/css/debug/linenumbers-mediaquery.css	
+++ /dev/null
@@ -1,40 +0,0 @@
-@charset "UTF-8";
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000033}}
-/* @charset "ISO-8859-1"; */
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000323}}
-.tst3 {
-  color: grey;
-}
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\0000315}}
-.test1 {
-  color: black;
-}
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\000036}}
-.test2 {
-  color: red;
-}
-@media all {
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000035}}
-  .tst {
-    color: black;
-  }
-}
-@media all and screen {
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000037}}
-  .tst {
-    color: red;
-  }
-  @media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\000039}}
-  .tst .tst3 {
-    color: white;
-  }
-}
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathimportesc}test\.less}line{font-family:\0000318}}
-.tst2 {
-  color: white;
-}
-@media -sass-debug-info{filename{font-family:file\:\/\/{pathesc}linenumbers\.less}line{font-family:\0000327}}
-.test {
-  color: red;
-  width: 2;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/empty.css b/test/Fixtures/lessjs (1.6)/css/empty.css
deleted file mode 100644
index e69de29b..00000000
diff --git a/test/Fixtures/lessjs (1.6)/css/extend-chaining.css b/test/Fixtures/lessjs (1.6)/css/extend-chaining.css
deleted file mode 100644
index 820e134f..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extend-chaining.css	
+++ /dev/null
@@ -1,81 +0,0 @@
-.a,
-.b,
-.c {
-  color: black;
-}
-.f,
-.e,
-.d {
-  color: black;
-}
-.g.h,
-.i.j.h,
-.k.j.h {
-  color: black;
-}
-.i.j,
-.k.j {
-  color: white;
-}
-.l,
-.m,
-.n,
-.o,
-.p,
-.q,
-.r,
-.s,
-.t {
-  color: black;
-}
-.u,
-.v.u.v {
-  color: black;
-}
-.w,
-.v.w.v {
-  color: black;
-}
-.x,
-.y,
-.z {
-  color: x;
-}
-.y,
-.z,
-.x {
-  color: y;
-}
-.z,
-.x,
-.y {
-  color: z;
-}
-.va,
-.vb,
-.vc {
-  color: black;
-}
-.vb,
-.vc {
-  color: white;
-}
-@media tv {
-  .ma,
-  .mb,
-  .mc {
-    color: black;
-  }
-  .md,
-  .ma,
-  .mb,
-  .mc {
-    color: white;
-  }
-}
-@media tv and plasma {
-  .me,
-  .mf {
-    background: red;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/extend-clearfix.css b/test/Fixtures/lessjs (1.6)/css/extend-clearfix.css
deleted file mode 100644
index 966892a2..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extend-clearfix.css	
+++ /dev/null
@@ -1,19 +0,0 @@
-.clearfix,
-.foo,
-.bar {
-  *zoom: 1;
-}
-.clearfix:after,
-.foo:after,
-.bar:after {
-  content: '';
-  display: block;
-  clear: both;
-  height: 0;
-}
-.foo {
-  color: red;
-}
-.bar {
-  color: blue;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/extend-exact.css b/test/Fixtures/lessjs (1.6)/css/extend-exact.css
deleted file mode 100644
index beff4133..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extend-exact.css	
+++ /dev/null
@@ -1,37 +0,0 @@
-.replace.replace .replace,
-.c.replace + .replace .replace,
-.replace.replace .c,
-.c.replace + .replace .c,
-.rep_ace {
-  prop: copy-paste-replace;
-}
-.a .b .c {
-  prop: not_effected;
-}
-.a,
-.effected {
-  prop: is_effected;
-}
-.a .b {
-  prop: not_effected;
-}
-.a .b.c {
-  prop: not_effected;
-}
-.c .b .a,
-.a .b .a,
-.c .a .a,
-.a .a .a,
-.c .b .c,
-.a .b .c,
-.c .a .c,
-.a .a .c {
-  prop: not_effected;
-}
-.e.e,
-.dbl {
-  prop: extend-double;
-}
-.e.e:hover {
-  hover: not-extended;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/extend-media.css b/test/Fixtures/lessjs (1.6)/css/extend-media.css
deleted file mode 100644
index 23bd7b85..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extend-media.css	
+++ /dev/null
@@ -1,24 +0,0 @@
-.ext1 .ext2,
-.all .ext2 {
-  background: black;
-}
-@media tv {
-  .ext1 .ext3,
-  .tv-lowres .ext3,
-  .all .ext3 {
-    color: white;
-  }
-  .tv-lowres {
-    background: blue;
-  }
-}
-@media tv and hires {
-  .ext1 .ext4,
-  .tv-hires .ext4,
-  .all .ext4 {
-    color: green;
-  }
-  .tv-hires {
-    background: red;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/extend-nest.css b/test/Fixtures/lessjs (1.6)/css/extend-nest.css
deleted file mode 100644
index 2c3905d9..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extend-nest.css	
+++ /dev/null
@@ -1,57 +0,0 @@
-.sidebar,
-.sidebar2,
-.type1 .sidebar3,
-.type2.sidebar4 {
-  width: 300px;
-  background: red;
-}
-.sidebar .box,
-.sidebar2 .box,
-.type1 .sidebar3 .box,
-.type2.sidebar4 .box {
-  background: #FFF;
-  border: 1px solid #000;
-  margin: 10px 0;
-}
-.sidebar2 {
-  background: blue;
-}
-.type1 .sidebar3 {
-  background: green;
-}
-.type2.sidebar4 {
-  background: red;
-}
-.button,
-.submit {
-  color: black;
-}
-.button:hover,
-.submit:hover {
-  color: white;
-}
-.button2 :hover {
-  nested: white;
-}
-.button2 :hover {
-  notnested: black;
-}
-.amp-test-h,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g {
-  test: extended by masses of selectors;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/extend-selector.css b/test/Fixtures/lessjs (1.6)/css/extend-selector.css
deleted file mode 100644
index da47254b..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extend-selector.css	
+++ /dev/null
@@ -1,80 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion,
-.badError.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error,
-.intrusion .badError {
-  display: none;
-}
-.badError {
-  border-width: 3px;
-}
-.foo .bar,
-.foo .baz,
-.ext1 .ext2 .bar,
-.ext1 .ext2 .baz,
-.ext3 .bar,
-.ext3 .baz,
-.ext4 .bar,
-.ext4 .baz {
-  display: none;
-}
-div.ext5,
-.ext6 > .ext5,
-div.ext7,
-.ext6 > .ext7 {
-  width: 100px;
-}
-.ext,
-.a .c,
-.b .c {
-  test: 1;
-}
-.a,
-.b {
-  test: 2;
-}
-.a .c,
-.b .c {
-  test: 3;
-}
-.a .c .d,
-.b .c .d {
-  test: 4;
-}
-.replace.replace .replace,
-.c.replace + .replace .replace,
-.replace.replace .c,
-.c.replace + .replace .c,
-.rep_ace.rep_ace .rep_ace,
-.c.rep_ace + .rep_ace .rep_ace,
-.rep_ace.rep_ace .c,
-.c.rep_ace + .rep_ace .c {
-  prop: copy-paste-replace;
-}
-.attributes [data="test"],
-.attributes .attributes .attribute-test {
-  extend: attributes;
-}
-.attributes [data],
-.attributes .attributes .attribute-test2 {
-  extend: attributes2;
-}
-.attributes [data="test3"],
-.attributes .attributes .attribute-test {
-  extend: attributes2;
-}
-.header .header-nav,
-.footer .footer-nav {
-  background: red;
-}
-.header .header-nav:before,
-.footer .footer-nav:before {
-  background: blue;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/extend.css b/test/Fixtures/lessjs (1.6)/css/extend.css
deleted file mode 100644
index 2895641a..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extend.css	
+++ /dev/null
@@ -1,76 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion,
-.badError.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error,
-.intrusion .badError {
-  display: none;
-}
-.badError {
-  border-width: 3px;
-}
-.foo .bar,
-.foo .baz,
-.ext1 .ext2 .bar,
-.ext1 .ext2 .baz,
-.ext3 .bar,
-.ext3 .baz,
-.foo .ext3,
-.ext4 .bar,
-.ext4 .baz,
-.foo .ext4 {
-  display: none;
-}
-div.ext5,
-.ext6 > .ext5,
-div.ext7,
-.ext6 > .ext7 {
-  width: 100px;
-}
-.ext8.ext9,
-.fuu {
-  result: add-foo;
-}
-.ext8 .ext9,
-.ext8 + .ext9,
-.ext8 > .ext9,
-.buu,
-.zap,
-.zoo {
-  result: bar-matched;
-}
-.ext8.nomatch {
-  result: none;
-}
-.ext8 .ext9,
-.buu {
-  result: match-nested-bar;
-}
-.ext8.ext9,
-.fuu {
-  result: match-nested-foo;
-}
-.aa,
-.cc {
-  color: black;
-}
-.aa .dd,
-.aa .ee {
-  background: red;
-}
-.bb,
-.cc,
-.ee,
-.ff {
-  background: red;
-}
-.bb .bb,
-.ff .ff {
-  color: black;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/extract-and-length.css b/test/Fixtures/lessjs (1.6)/css/extract-and-length.css
deleted file mode 100644
index f550e201..00000000
--- a/test/Fixtures/lessjs (1.6)/css/extract-and-length.css	
+++ /dev/null
@@ -1,133 +0,0 @@
-.multiunit {
-  length: 6;
-  extract: abc "abc" 1 1px 1% #112233;
-}
-.incorrect-index {
-  v1: extract(a b c, 5);
-  v2: extract(a, b, c, -2);
-}
-.scalar {
-  var-value: variable;
-  var-length: 1;
-  ill-index: extract(variable, 2);
-  name-value: name;
-  string-value: "string";
-  number-value: 12345678;
-  color-value: #0000ff;
-  rgba-value: rgba(80, 160, 240, 0.67);
-  empty-value: ;
-  name-length: 1;
-  string-length: 1;
-  number-length: 1;
-  color-length: 1;
-  rgba-length: 1;
-  empty-length: 1;
-}
-.mixin-arguments-1 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-4 {
-  length: 0;
-  extract: extract(, 2) | extract(, 1);
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-4 {
-  length: 3;
-  extract: c | b;
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: 3 | 2 | 1;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: 3 | 2 | 1;
-}
-.mixin-arguments-4 {
-  length: 3;
-  extract: 3 | 2;
-}
-.md-space-comma {
-  length-1: 3;
-  extract-1: 1 2 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-space-comma-as-args-2 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-space-comma-as-args-3 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-space-comma-as-args-4 {
-  length: 2;
-  extract: "x" "y" "z" | 1 2 3;
-}
-.md-cat-space-comma {
-  length-1: 3;
-  extract-1: 1 2 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-cat-space-comma-as-args-2 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-cat-space-comma-as-args-3 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-cat-space-comma-as-args-4 {
-  length: 2;
-  extract: "x" "y" "z" | 1 2 3;
-}
-.md-cat-comma-space {
-  length-1: 3;
-  extract-1: 1, 2, 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-cat-comma-space-as-args-1 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-2 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-3 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-4 {
-  length: 0;
-  extract: extract(, 2) | extract(, 1);
-}
-.md-3D {
-  length-1: 2;
-  extract-1: a b c d, 1 2 3 4;
-  length-2: 2;
-  extract-2: 5 6 7 8;
-  length-3: 4;
-  extract-3: 7;
-  length-4: 1;
-  extract-4: 8;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/functions.css b/test/Fixtures/lessjs (1.6)/css/functions.css
deleted file mode 100644
index 2c7896df..00000000
--- a/test/Fixtures/lessjs (1.6)/css/functions.css	
+++ /dev/null
@@ -1,141 +0,0 @@
-#functions {
-  color: #660000;
-  width: 16;
-  height: undefined("self");
-  border-width: 5;
-  variable: 11;
-  background: linear-gradient(#000000, #ffffff);
-}
-#built-in {
-  escaped: -Some::weird(#thing, y);
-  lighten: #ffcccc;
-  darken: #330000;
-  saturate: #203c31;
-  desaturate: #29332f;
-  greyscale: #2e2e2e;
-  hsl-clamp: #ffffff;
-  spin-p: #bf6a40;
-  spin-n: #bf4055;
-  luma-white: 100%;
-  luma-black: 0%;
-  luma-black-alpha: 0%;
-  luma-red: 21%;
-  luma-green: 72%;
-  luma-blue: 7%;
-  luma-yellow: 93%;
-  luma-cyan: 79%;
-  luma-white-alpha: 50%;
-  contrast-filter: contrast(30%);
-  saturate-filter: saturate(5%);
-  contrast-white: #000000;
-  contrast-black: #ffffff;
-  contrast-red: #ffffff;
-  contrast-green: #000000;
-  contrast-blue: #ffffff;
-  contrast-yellow: #000000;
-  contrast-cyan: #000000;
-  contrast-light: #111111;
-  contrast-dark: #eeeeee;
-  contrast-wrongorder: #111111;
-  contrast-light-thresh: #111111;
-  contrast-dark-thresh: #eeeeee;
-  contrast-high-thresh: #eeeeee;
-  contrast-low-thresh: #111111;
-  contrast-light-thresh-per: #111111;
-  contrast-dark-thresh-per: #eeeeee;
-  contrast-high-thresh-per: #eeeeee;
-  contrast-low-thresh-per: #111111;
-  format: "rgb(32, 128, 64)";
-  format-string: "hello world";
-  format-multiple: "hello earth 2";
-  format-url-encode: "red is %23ff0000";
-  eformat: rgb(32, 128, 64);
-  unitless: 12;
-  unit: 14em;
-  hue: 98;
-  saturation: 12%;
-  lightness: 95%;
-  hsvhue: 98;
-  hsvsaturation: 12%;
-  hsvvalue: 95%;
-  red: 255;
-  green: 255;
-  blue: 255;
-  rounded: 11;
-  rounded-two: 10.67;
-  roundedpx: 3px;
-  roundedpx-three: 3.333px;
-  rounded-percentage: 10%;
-  ceil: 11px;
-  floor: 12px;
-  sqrt: 5px;
-  pi: 3.14159265;
-  mod: 2m;
-  abs: 4%;
-  tan: 0.90040404;
-  sin: 0.17364818;
-  cos: 0.84385396;
-  atan: 0.1rad;
-  atan: 34deg;
-  atan: 45deg;
-  pow: 64px;
-  pow: 64;
-  pow: 27;
-  min: 0;
-  min: min("junk", 5);
-  min: 3pt;
-  max: 3;
-  max: max(8%, 1cm);
-  percentage: 20%;
-  color: #ff0011;
-  tint: #898989;
-  tint-full: #ffffff;
-  tint-percent: #898989;
-  tint-negative: #656565;
-  shade: #686868;
-  shade-full: #000000;
-  shade-percent: #686868;
-  shade-negative: #868686;
-  fade-out: rgba(255, 0, 0, 0.95);
-  fade-in: rgba(255, 0, 0, 0.95);
-  hsv: #4d2926;
-  hsva: rgba(77, 40, 38, 0.2);
-  mix: #ff3300;
-  mix-0: #ffff00;
-  mix-100: #ff0000;
-  mix-weightless: #ff8000;
-  mixt: rgba(255, 0, 0, 0.5);
-}
-#built-in .is-a {
-  color: true;
-  color1: true;
-  color2: true;
-  color3: true;
-  keyword: true;
-  number: true;
-  string: true;
-  pixel: true;
-  percent: true;
-  em: true;
-  cat: true;
-}
-#alpha {
-  alpha: rgba(153, 94, 51, 0.6);
-  alpha2: 0.5;
-  alpha3: 0;
-}
-#blendmodes {
-  multiply: #ed0000;
-  screen: #f600f6;
-  overlay: #ed0000;
-  softlight: #fa0000;
-  hardlight: #0000ed;
-  difference: #f600f6;
-  exclusion: #f600f6;
-  average: #7b007b;
-  negation: #d73131;
-}
-#extract-and-length {
-  extract: 3 2 1 C B A;
-  length: 6;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/globalVars/extended.css b/test/Fixtures/lessjs (1.6)/css/globalVars/extended.css
deleted file mode 100644
index 1149ac87..00000000
--- a/test/Fixtures/lessjs (1.6)/css/globalVars/extended.css	
+++ /dev/null
@@ -1,12 +0,0 @@
-/**
-  * Test
-  */
-#header {
-  color: #333333;
-  border-left: 1px;
-  border-right: 2px;
-}
-#footer {
-  color: #114411;
-  border-color: #f20d0d;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/globalVars/simple.css b/test/Fixtures/lessjs (1.6)/css/globalVars/simple.css
deleted file mode 100644
index 55779d8b..00000000
--- a/test/Fixtures/lessjs (1.6)/css/globalVars/simple.css	
+++ /dev/null
@@ -1,6 +0,0 @@
-/**
-  * Test
-  */
-.class {
-  color: #ff0000;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/ie-filters.css b/test/Fixtures/lessjs (1.6)/css/ie-filters.css
deleted file mode 100644
index 007aa536..00000000
--- a/test/Fixtures/lessjs (1.6)/css/ie-filters.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.nav {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=20);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0);
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#333333", endColorstr="#000000", GradientType=0);
-}
-.evalTest1 {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=30);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=5);
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/import-inline.css b/test/Fixtures/lessjs (1.6)/css/import-inline.css
deleted file mode 100644
index f198d3c1..00000000
--- a/test/Fixtures/lessjs (1.6)/css/import-inline.css	
+++ /dev/null
@@ -1,5 +0,0 @@
-this isn't very valid CSS.
-@media (min-width: 600px) {
-  #css { color: yellow; }
-
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/import-interpolation.css b/test/Fixtures/lessjs (1.6)/css/import-interpolation.css
deleted file mode 100644
index 16b7a150..00000000
--- a/test/Fixtures/lessjs (1.6)/css/import-interpolation.css	
+++ /dev/null
@@ -1,6 +0,0 @@
-body {
-  width: 100%;
-}
-.a {
-  var: test;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/import-once.css b/test/Fixtures/lessjs (1.6)/css/import-once.css
deleted file mode 100644
index 2f86b3b3..00000000
--- a/test/Fixtures/lessjs (1.6)/css/import-once.css	
+++ /dev/null
@@ -1,15 +0,0 @@
-#import {
-  color: #ff0000;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/import-reference.css b/test/Fixtures/lessjs (1.6)/css/import-reference.css
deleted file mode 100644
index d61df816..00000000
--- a/test/Fixtures/lessjs (1.6)/css/import-reference.css	
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
-  The media statement above is invalid (no selector)
-  We should ban invalid media queries with properties and no selector?
-*/
-.visible {
-  color: red;
-}
-.visible .c {
-  color: green;
-}
-.visible {
-  color: green;
-}
-.visible:hover {
-  color: green;
-}
-.only-with-visible + .visible,
-.visible + .only-with-visible,
-.visible + .visible {
-  color: green;
-}
-.only-with-visible + .visible .sub,
-.visible + .only-with-visible .sub,
-.visible + .visible .sub {
-  color: green;
-}
-.b {
-  color: red;
-  color: green;
-}
-.b .c {
-  color: green;
-}
-.b:hover {
-  color: green;
-}
-.b + .b {
-  color: green;
-}
-.b + .b .sub {
-  color: green;
-}
-.y {
-  pulled-in: yes;
-}
-/* comment pulled in */
-.visible {
-  extend: test;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/import.css b/test/Fixtures/lessjs (1.6)/css/import.css
deleted file mode 100644
index a3749181..00000000
--- a/test/Fixtures/lessjs (1.6)/css/import.css	
+++ /dev/null
@@ -1,36 +0,0 @@
-@import url(http://fonts.googleapis.com/css?family=Open+Sans);
-@import url(/absolute/something.css) screen and (color) and (max-width: 600px);
-@import url("//ha.com/file.css") (min-width: 100px);
-#import-test {
-  height: 10px;
-  color: #ff0000;
-  width: 10px;
-  height: 30%;
-}
-@media screen and (max-width: 600px) {
-  body {
-    width: 100%;
-  }
-}
-#import {
-  color: #ff0000;
-}
-.mixin {
-  height: 10px;
-  color: #ff0000;
-}
-@media screen and (max-width: 601px) {
-  #css {
-    color: yellow;
-  }
-}
-@media screen and (max-width: 602px) {
-  body {
-    width: 100%;
-  }
-}
-@media screen and (max-width: 603px) {
-  #css {
-    color: yellow;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/javascript.css b/test/Fixtures/lessjs (1.6)/css/javascript.css
deleted file mode 100644
index 8268ab33..00000000
--- a/test/Fixtures/lessjs (1.6)/css/javascript.css	
+++ /dev/null
@@ -1,23 +0,0 @@
-.eval {
-  js: 42;
-  js: 2;
-  js: "hello world";
-  js: 1, 2, 3;
-  title: "string";
-  ternary: true;
-  multiline: 2;
-}
-.scope {
-  var: 42;
-  escaped: 7px;
-}
-.vars {
-  width: 8;
-}
-.escape-interpol {
-  width: hello world;
-}
-.arrays {
-  ary: "1, 2, 3";
-  ary1: "1, 2, 3";
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/lazy-eval.css b/test/Fixtures/lessjs (1.6)/css/lazy-eval.css
deleted file mode 100644
index 1adfb8f3..00000000
--- a/test/Fixtures/lessjs (1.6)/css/lazy-eval.css	
+++ /dev/null
@@ -1,3 +0,0 @@
-.lazy-eval {
-  width: 100%;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/legacy/legacy.css b/test/Fixtures/lessjs (1.6)/css/legacy/legacy.css
deleted file mode 100644
index 2f9bb80b..00000000
--- a/test/Fixtures/lessjs (1.6)/css/legacy/legacy.css	
+++ /dev/null
@@ -1,7 +0,0 @@
-@media (-o-min-device-pixel-ratio: 2/1) {
-  .test-math-and-units {
-    font: ignores 0/0 rules;
-    test-division: 7em;
-    simple: 2px;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/media.css b/test/Fixtures/lessjs (1.6)/css/media.css
deleted file mode 100644
index 607f0e44..00000000
--- a/test/Fixtures/lessjs (1.6)/css/media.css	
+++ /dev/null
@@ -1,219 +0,0 @@
-@media print {
-  .class {
-    color: blue;
-  }
-  .class .sub {
-    width: 42;
-  }
-  .top,
-  header > h1 {
-    color: #444444;
-  }
-}
-@media screen {
-  body {
-    max-width: 480;
-  }
-}
-@media all and (device-aspect-ratio: 16 / 9) {
-  body {
-    max-width: 800px;
-  }
-}
-@media all and (orientation: portrait) {
-  aside {
-    float: none;
-  }
-}
-@media handheld and (min-width: 42), screen and (min-width: 20em) {
-  body {
-    max-width: 480px;
-  }
-}
-@media print {
-  body {
-    padding: 20px;
-  }
-  body header {
-    background-color: red;
-  }
-}
-@media print and (orientation: landscape) {
-  body {
-    margin-left: 20px;
-  }
-}
-@media screen {
-  .sidebar {
-    width: 300px;
-  }
-}
-@media screen and (orientation: landscape) {
-  .sidebar {
-    width: 500px;
-  }
-}
-@media a and b {
-  .first .second .third {
-    width: 300px;
-  }
-  .first .second .fourth {
-    width: 3;
-  }
-}
-@media a and b and c {
-  .first .second .third {
-    width: 500px;
-  }
-}
-@media a, b and c {
-  body {
-    width: 95%;
-  }
-}
-@media a and x, b and c and x, a and y, b and c and y {
-  body {
-    width: 100%;
-  }
-}
-.a {
-  background: black;
-}
-@media handheld {
-  .a {
-    background: white;
-  }
-}
-@media handheld and (max-width: 100px) {
-  .a {
-    background: red;
-  }
-}
-.b {
-  background: black;
-}
-@media handheld {
-  .b {
-    background: white;
-  }
-}
-@media handheld and (max-width: 200px) {
-  .b {
-    background: red;
-  }
-}
-@media only screen and (max-width: 200px) {
-  body {
-    width: 480px;
-  }
-}
-@media print {
-  @page :left {
-    margin: 0.5cm;
-  }
-  @page :right {
-    margin: 0.5cm;
-  }
-  @page Test:first {
-    margin: 1cm;
-  }
-  @page :first {
-    size: 8.5in 11in;
-    
-    @top-left {
-      margin: 1cm;
-    }
-    @top-left-corner {
-      margin: 1cm;
-    }
-    @top-center {
-      margin: 1cm;
-    }
-    @top-right {
-      margin: 1cm;
-    }
-    @top-right-corner {
-      margin: 1cm;
-    }
-    @bottom-left {
-      margin: 1cm;
-    }
-    @bottom-left-corner {
-      margin: 1cm;
-    }
-    @bottom-center {
-      margin: 1cm;
-    }
-    @bottom-right {
-      margin: 1cm;
-    }
-    @bottom-right-corner {
-      margin: 1cm;
-    }
-    @left-top {
-      margin: 1cm;
-    }
-    @left-middle {
-      margin: 1cm;
-    }
-    @left-bottom {
-      margin: 1cm;
-    }
-    @right-top {
-      margin: 1cm;
-    }
-    @right-middle {
-      content: "Page " counter(page);
-    }
-    @right-bottom {
-      margin: 1cm;
-    }
-  }
-}
-@media (-webkit-min-device-pixel-ratio: 2), (min--moz-device-pixel-ratio: 2), (-o-min-device-pixel-ratio: 2/1), (min-resolution: 2dppx), (min-resolution: 128dpcm) {
-  .b {
-    background: red;
-  }
-}
-body {
-  background: red;
-}
-@media (max-width: 500px) {
-  body {
-    background: green;
-  }
-}
-@media (max-width: 1000px) {
-  body {
-    background: red;
-    background: blue;
-  }
-}
-@media (max-width: 1000px) and (max-width: 500px) {
-  body {
-    background: green;
-  }
-}
-@media (max-width: 1200px) {
-  /* a comment */
-}
-@media (max-width: 1200px) and (max-width: 900px) {
-  body {
-    font-size: 11px;
-  }
-}
-@media (min-width: 480px) {
-  .nav-justified > li {
-    display: table-cell;
-  }
-}
-@media (min-width: 768px) and (min-width: 480px) {
-  .menu > li {
-    display: table-cell;
-  }
-}
-@media all and tv {
-  .all-and-tv-variables {
-    var: all-and-tv;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/merge.css b/test/Fixtures/lessjs (1.6)/css/merge.css
deleted file mode 100644
index 18539f1a..00000000
--- a/test/Fixtures/lessjs (1.6)/css/merge.css	
+++ /dev/null
@@ -1,26 +0,0 @@
-.test1 {
-  transform: rotate(90deg), skew(30deg), scale(2, 4);
-}
-.test2 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scaleX(45deg);
-}
-.test3 {
-  transform: scaleX(45deg);
-  background: url(data://img1.png);
-}
-.test4 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test5 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test6 {
-  transform: scale(2, 4);
-}
-.test-interleaved {
-  transform: t1, t2, t3;
-  background: b1, b2, b3;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-args.css b/test/Fixtures/lessjs (1.6)/css/mixins-args.css
deleted file mode 100644
index 2b6c5c96..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-args.css	
+++ /dev/null
@@ -1,113 +0,0 @@
-#hidden {
-  color: transparent;
-}
-#hidden1 {
-  color: transparent;
-}
-.two-args {
-  color: blue;
-  width: 10px;
-  height: 99%;
-  border: 2px dotted #000000;
-}
-.one-arg {
-  width: 15px;
-  height: 49%;
-}
-.no-parens {
-  width: 5px;
-  height: 49%;
-}
-.no-args {
-  width: 5px;
-  height: 49%;
-}
-.var-args {
-  width: 45;
-  height: 17%;
-}
-.multi-mix {
-  width: 10px;
-  height: 29%;
-  margin: 4;
-  padding: 5;
-}
-body {
-  padding: 30px;
-  color: #ff0000;
-}
-.scope-mix {
-  width: 8;
-}
-.content {
-  width: 600px;
-}
-.content .column {
-  margin: 600px;
-}
-#same-var-name {
-  radius: 5px;
-}
-#var-inside {
-  width: 10px;
-}
-.arguments {
-  border: 1px solid #000000;
-  width: 1px;
-}
-.arguments2 {
-  border: 0px;
-  width: 0px;
-}
-.arguments3 {
-  border: 0px;
-  width: 0px;
-}
-.arguments4 {
-  border: 0 1 2 3 4;
-  rest: 1 2 3 4;
-  width: 0;
-}
-.edge-case {
-  border: "{";
-  width: "{";
-}
-.slash-vs-math {
-  border-radius: 2px/5px;
-  border-radius: 5px/10px;
-  border-radius: 6px;
-}
-.comma-vs-semi-colon {
-  one: a;
-  two: b, c;
-  one: d, e;
-  two: f;
-  one: g;
-  one: h;
-  one: i;
-  one: j;
-  one: k;
-  two: l;
-  one: m, n;
-  one: o, p;
-  two: q;
-  one: r, s;
-  two: t;
-}
-#named-conflict {
-  four: a, 11, 12, 13;
-  four: a, 21, 22, 23;
-}
-.test-mixin-default-arg {
-  defaults: 1px 1px 1px;
-  defaults: 2px 2px 2px;
-}
-.selector {
-  margin: 2, 2, 2, 2;
-}
-.selector2 {
-  margin: 2, 2, 2, 2;
-}
-.selector3 {
-  margin: 4;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-closure.css b/test/Fixtures/lessjs (1.6)/css/mixins-closure.css
deleted file mode 100644
index b1021b6f..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-closure.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.class {
-  width: 99px;
-}
-.overwrite {
-  width: 99px;
-}
-.nested .class {
-  width: 5px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-guards-default-func.css b/test/Fixtures/lessjs (1.6)/css/mixins-guards-default-func.css
deleted file mode 100644
index e47f05cf..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-guards-default-func.css	
+++ /dev/null
@@ -1,129 +0,0 @@
-guard-default-basic-1-1 {
-  case: 1;
-}
-guard-default-basic-1-2 {
-  default: 2;
-}
-guard-default-basic-2-0 {
-  default: 0;
-}
-guard-default-basic-2-2 {
-  case: 2;
-}
-guard-default-basic-3-0 {
-  default: 0;
-}
-guard-default-basic-3-2 {
-  case: 2;
-}
-guard-default-basic-3-3 {
-  case: 3;
-}
-guard-default-definition-order-0 {
-  default: 0;
-}
-guard-default-definition-order-2 {
-  case: 2;
-}
-guard-default-definition-order-2 {
-  case: 3;
-}
-guard-default-out-of-guard-0 {
-  case-0: default();
-  case-1: 1;
-  default: 2;
-  case-2: default();
-}
-guard-default-out-of-guard-1 {
-  default: default();
-}
-guard-default-out-of-guard-2 {
-  default: default();
-}
-guard-default-expr-not-1 {
-  case: 1;
-  default: 1;
-}
-guard-default-expr-eq-true {
-  case: true;
-}
-guard-default-expr-eq-false {
-  case: false;
-  default: false;
-}
-guard-default-expr-or-1 {
-  case: 1;
-}
-guard-default-expr-or-2 {
-  case: 2;
-  default: 2;
-}
-guard-default-expr-or-3 {
-  default: 3;
-}
-guard-default-expr-and-1 {
-  case: 1;
-}
-guard-default-expr-and-2 {
-  case: 2;
-}
-guard-default-expr-and-3 {
-  default: 3;
-}
-guard-default-expr-always-1 {
-  case: 1;
-  default: 1;
-}
-guard-default-expr-always-2 {
-  default: 2;
-}
-guard-default-expr-never-1 {
-  case: 1;
-}
-guard-default-multi-1-0 {
-  case: 0;
-}
-guard-default-multi-1-1 {
-  default-1: 1;
-}
-guard-default-multi-2-1 {
-  default-1: no;
-}
-guard-default-multi-2-2 {
-  default-2: no;
-}
-guard-default-multi-2-3 {
-  default-3: 3;
-}
-guard-default-multi-3-blue {
-  case-2: #00008b;
-}
-guard-default-multi-3-green {
-  default-color: #008000;
-}
-guard-default-multi-3-foo {
-  case-1: I am 'foo';
-}
-guard-default-multi-3-baz {
-  default-string: I am 'baz';
-}
-guard-default-multi-4 {
-  always: 1;
-  always: 2;
-  case: 2;
-}
-guard-default-not-ambiguos-2 {
-  case: 1;
-  not-default: 2;
-}
-guard-default-not-ambiguos-3 {
-  case: 1;
-  not-default-1: 2;
-  not-default-2: 2;
-}
-guard-default-scopes-3 {
-  3: when default;
-}
-guard-default-scopes-1 {
-  1: no condition;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-guards.css b/test/Fixtures/lessjs (1.6)/css/mixins-guards.css
deleted file mode 100644
index 25e6f287..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-guards.css	
+++ /dev/null
@@ -1,82 +0,0 @@
-.light1 {
-  color: white;
-  margin: 1px;
-}
-.light2 {
-  color: black;
-  margin: 1px;
-}
-.max1 {
-  width: 6;
-}
-.max2 {
-  width: 8;
-}
-.glob1 {
-  margin: auto auto;
-}
-.ops1 {
-  height: gt-or-eq;
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-}
-.ops2 {
-  height: gt-or-eq;
-  height: not-eq;
-}
-.ops3 {
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-  height: not-eq;
-}
-.default1 {
-  content: default;
-}
-.test1 {
-  content: "true.";
-}
-.test2 {
-  content: "false.";
-}
-.test3 {
-  content: "false.";
-}
-.test4 {
-  content: "false.";
-}
-.test5 {
-  content: "false.";
-}
-.bool1 {
-  content: true and true;
-  content: true;
-  content: false, true;
-  content: false and true and true, true;
-  content: false, true and true;
-  content: false, false, true;
-  content: false, true and true and true, false;
-  content: not false;
-  content: not false and false, not false;
-}
-.equality-units {
-  test: pass;
-}
-.colorguardtest {
-  content: is #ff0000;
-  content: is not #0000ff its #ff0000;
-  content: is not #0000ff its #800080;
-}
-.stringguardtest {
-  content: is theme1;
-  content: is not theme2;
-  content: is theme1 no quotes;
-}
-#tryNumberPx {
-  catch: all;
-  declare: 4;
-  declare: 4px;
-}
-.call-lock-mixin .call-inner-lock-mixin {
-  a: 1;
-  x: 1;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-important.css b/test/Fixtures/lessjs (1.6)/css/mixins-important.css
deleted file mode 100644
index b100af7f..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-important.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.class {
-  border: 1;
-  boxer: 1;
-  border-width: 1;
-  border: 2 !important;
-  boxer: 2 !important;
-  border-width: 2 !important;
-  border: 3;
-  boxer: 3;
-  border-width: 3;
-  border: 4 !important;
-  boxer: 4 !important;
-  border-width: 4 !important;
-  border: 5;
-  boxer: 5;
-  border-width: 5;
-  border: 0 !important;
-  boxer: 0 !important;
-  border-width: 0 !important;
-  border: 9 !important;
-  border: 9;
-  boxer: 9;
-  border-width: 9;
-}
-.class .inner {
-  test: 1;
-}
-.class .inner {
-  test: 2 !important;
-}
-.class .inner {
-  test: 3;
-}
-.class .inner {
-  test: 4 !important;
-}
-.class .inner {
-  test: 5;
-}
-.class .inner {
-  test: 0 !important;
-}
-.class .inner {
-  test: 9;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-interpolated.css b/test/Fixtures/lessjs (1.6)/css/mixins-interpolated.css
deleted file mode 100644
index 637b5b68..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-interpolated.css	
+++ /dev/null
@@ -1,39 +0,0 @@
-.foo {
-  a: 1;
-}
-.foo {
-  a: 2;
-}
-#foo {
-  a: 3;
-}
-#foo {
-  a: 4;
-}
-mi-test-a {
-  a: 1;
-  a: 2;
-  a: 3;
-  a: 4;
-}
-.b .bb.foo-xxx .yyy-foo#foo .foo.bbb {
-  b: 1;
-}
-mi-test-b {
-  b: 1;
-}
-#foo-foo > .bar .baz {
-  c: c;
-}
-mi-test-c-1 > .bar .baz {
-  c: c;
-}
-mi-test-c-2 .baz {
-  c: c;
-}
-mi-test-c-3 {
-  c: c;
-}
-mi-test-d {
-  gender: "Male";
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-named-args.css b/test/Fixtures/lessjs (1.6)/css/mixins-named-args.css
deleted file mode 100644
index e460aa10..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-named-args.css	
+++ /dev/null
@@ -1,27 +0,0 @@
-.named-arg {
-  color: blue;
-  width: 5px;
-  height: 99%;
-  args: 1px 100%;
-  text-align: center;
-}
-.class {
-  width: 5px;
-  height: 19%;
-  args: 1px 20%;
-}
-.all-args-wrong-args {
-  width: 10px;
-  height: 9%;
-  args: 2px 10%;
-}
-.named-args2 {
-  width: 15px;
-  height: 49%;
-  color: #646464;
-}
-.named-args3 {
-  width: 5px;
-  height: 29%;
-  color: #123456;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-nested.css b/test/Fixtures/lessjs (1.6)/css/mixins-nested.css
deleted file mode 100644
index 6378c475..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-nested.css	
+++ /dev/null
@@ -1,14 +0,0 @@
-.class .inner {
-  height: 300;
-}
-.class .inner .innest {
-  width: 30;
-  border-width: 60;
-}
-.class2 .inner {
-  height: 600;
-}
-.class2 .inner .innest {
-  width: 60;
-  border-width: 120;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins-pattern.css b/test/Fixtures/lessjs (1.6)/css/mixins-pattern.css
deleted file mode 100644
index 8b828335..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins-pattern.css	
+++ /dev/null
@@ -1,47 +0,0 @@
-.zero {
-  variadic: true;
-  zero: 0;
-  one: 1;
-  two: 2;
-  three: 3;
-}
-.one {
-  variadic: true;
-  one: 1;
-  one-req: 1;
-  two: 2;
-  three: 3;
-}
-.two {
-  variadic: true;
-  two: 2;
-  three: 3;
-}
-.three {
-  variadic: true;
-  three-req: 3;
-  three: 3;
-}
-.left {
-  left: 1;
-}
-.right {
-  right: 1;
-}
-.border-right {
-  color: black;
-  border-right: 4px;
-}
-.border-left {
-  color: black;
-  border-left: 4px;
-}
-.only-right {
-  right: 33;
-}
-.only-left {
-  left: 33;
-}
-.left-right {
-  both: 330;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/mixins.css b/test/Fixtures/lessjs (1.6)/css/mixins.css
deleted file mode 100644
index 32097f97..00000000
--- a/test/Fixtures/lessjs (1.6)/css/mixins.css	
+++ /dev/null
@@ -1,141 +0,0 @@
-.mixin {
-  border: 1px solid black;
-}
-.mixout {
-  border-color: orange;
-}
-.borders {
-  border-style: dashed;
-}
-#namespace .borders {
-  border-style: dotted;
-}
-#namespace .biohazard {
-  content: "death";
-}
-#namespace .biohazard .man {
-  color: transparent;
-}
-#theme > .mixin {
-  background-color: grey;
-}
-#container {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-#header .milk {
-  color: white;
-  border: 1px solid black;
-  background-color: grey;
-}
-#header #cookie {
-  border-style: dashed;
-}
-#header #cookie .chips {
-  border-style: dotted;
-}
-#header #cookie .chips .calories {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-.secure-zone {
-  color: transparent;
-}
-.direct {
-  border-style: dotted;
-}
-.bo,
-.bar {
-  width: 100%;
-}
-.bo {
-  border: 1px;
-}
-.ar.bo.ca {
-  color: black;
-}
-.jo.ki {
-  background: none;
-}
-.amp.support {
-  color: orange;
-}
-.amp.support .higher {
-  top: 0px;
-}
-.amp.support.deeper {
-  height: auto;
-}
-.extended {
-  width: 100%;
-  border: 1px;
-  background: none;
-  color: orange;
-  top: 0px;
-  height: auto;
-}
-.extended .higher {
-  top: 0px;
-}
-.extended.deeper {
-  height: auto;
-}
-.do .re .mi .fa .sol .la .si {
-  color: cyan;
-}
-.mutli-selector-parents {
-  color: cyan;
-}
-.foo .bar {
-  width: 100%;
-}
-.underParents {
-  color: red;
-}
-.parent .underParents {
-  color: red;
-}
-* + h1 {
-  margin-top: 25px;
-}
-legend + h1 {
-  margin-top: 0;
-}
-h1 + * {
-  margin-top: 10px;
-}
-* + h2 {
-  margin-top: 20px;
-}
-legend + h2 {
-  margin-top: 0;
-}
-h2 + * {
-  margin-top: 8px;
-}
-* + h3 {
-  margin-top: 15px;
-}
-legend + h3 {
-  margin-top: 0;
-}
-h3 + * {
-  margin-top: 5px;
-}
-.error {
-  background-image: "/a.png";
-  background-position: center center;
-}
-.test-rec .recursion {
-  color: black;
-}
-.button {
-  padding-left: 44px;
-}
-.button.large {
-  padding-left: 40em;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/modifyVars/extended.css b/test/Fixtures/lessjs (1.6)/css/modifyVars/extended.css
deleted file mode 100644
index 32edb38f..00000000
--- a/test/Fixtures/lessjs (1.6)/css/modifyVars/extended.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-#header {
-  color: #333333;
-  border-left: 1px;
-  border-right: 2px;
-}
-#footer {
-  color: #114411;
-  border-color: #842210;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/no-output.css b/test/Fixtures/lessjs (1.6)/css/no-output.css
deleted file mode 100644
index e69de29b..00000000
diff --git a/test/Fixtures/lessjs (1.6)/css/operations.css b/test/Fixtures/lessjs (1.6)/css/operations.css
deleted file mode 100644
index fb9e0aff..00000000
--- a/test/Fixtures/lessjs (1.6)/css/operations.css	
+++ /dev/null
@@ -1,49 +0,0 @@
-#operations {
-  color: #111111;
-  height: 9px;
-  width: 3em;
-  substraction: 0;
-  division: 1;
-}
-#operations .spacing {
-  height: 9px;
-  width: 3em;
-}
-.with-variables {
-  height: 16em;
-  width: 24em;
-  size: 1cm;
-}
-.with-functions {
-  color: #646464;
-  color: #ff8080;
-  color: #c94a4a;
-}
-.negative {
-  height: 0px;
-  width: 4px;
-}
-.shorthands {
-  padding: -1px 2px 0 -4px;
-}
-.rem-dimensions {
-  font-size: 5.5rem;
-}
-.colors {
-  color: #123;
-  border-color: #334455;
-  background-color: #000000;
-}
-.colors .other {
-  color: #222222;
-  border-color: #222222;
-}
-.negations {
-  variable: -4px;
-  variable1: 0px;
-  variable2: 0px;
-  variable3: 8px;
-  variable4: 0px;
-  paren: -4px;
-  paren2: 16px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/parens.css b/test/Fixtures/lessjs (1.6)/css/parens.css
deleted file mode 100644
index dc09fdf5..00000000
--- a/test/Fixtures/lessjs (1.6)/css/parens.css	
+++ /dev/null
@@ -1,36 +0,0 @@
-.parens {
-  border: 2px solid #000000;
-  margin: 1px 3px 16 3;
-  width: 36;
-  padding: 2px 36px;
-}
-.more-parens {
-  padding: 8 4 4 4px;
-  width-all: 96;
-  width-first: 16 * 6;
-  width-keep: (4 * 4) * 6;
-  height-keep: (7 * 7) + (8 * 8);
-  height-all: 113;
-  height-parts: 49 + 64;
-  margin-keep: (4 * (5 + 5) / 2) - (4 * 2);
-  margin-parts: 20 - 8;
-  margin-all: 12;
-  border-radius-keep: 4px * (1 + 1) / 4 + 3px;
-  border-radius-parts: 8px / 7px;
-  border-radius-all: 5px;
-}
-.negative {
-  neg-var: -1;
-  neg-var-paren: -(1);
-}
-.nested-parens {
-  width: 2 * (4 * (2 + (1 + 6))) - 1;
-  height: ((2 + 3) * (2 + 3) / (9 - 4)) + 1;
-}
-.mixed-units {
-  margin: 2px 4em 1 5pc;
-  padding: 6px 1em 2px 2;
-}
-.test-false-negatives {
-  a: (;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/property-name-interp.css b/test/Fixtures/lessjs (1.6)/css/property-name-interp.css
deleted file mode 100644
index 2082b819..00000000
--- a/test/Fixtures/lessjs (1.6)/css/property-name-interp.css	
+++ /dev/null
@@ -1,20 +0,0 @@
-pi-test {
-  border: 0;
-  ufo-width: 50%;
-  *-z-border: 1px dashed blue;
-  -www-border-top: 2px;
-  radius-is-not-a-border: true;
-  border-top-left-radius: 2em;
-  border-top-red-radius-: 3pt;
-  global-local-mixer-property: strong;
-}
-pi-test-merge {
-  pre-property-ish: high, middle, low, base;
-  pre-property-ish+: nice try dude;
-}
-pi-indirect-vars {
-  auto: auto;
-}
-pi-complex-values {
-  3px rgba(255, 255, 0, 0.5), 3.141592653589793 /* foo */3px rgba(255, 255, 0, 0.5), 3.141592653589793 /* foo */: none;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/rulesets.css b/test/Fixtures/lessjs (1.6)/css/rulesets.css
deleted file mode 100644
index 408c76aa..00000000
--- a/test/Fixtures/lessjs (1.6)/css/rulesets.css	
+++ /dev/null
@@ -1,33 +0,0 @@
-#first > .one {
-  font-size: 2em;
-}
-#first > .one > #second .two > #deux {
-  width: 50%;
-}
-#first > .one > #second .two > #deux #third {
-  height: 100%;
-}
-#first > .one > #second .two > #deux #third:focus {
-  color: black;
-}
-#first > .one > #second .two > #deux #third:focus #fifth > #sixth .seventh #eighth + #ninth {
-  color: purple;
-}
-#first > .one > #second .two > #deux #fourth,
-#first > .one > #second .two > #deux #five,
-#first > .one > #second .two > #deux #six {
-  color: #110000;
-}
-#first > .one > #second .two > #deux #fourth .seven,
-#first > .one > #second .two > #deux #five .seven,
-#first > .one > #second .two > #deux #six .seven,
-#first > .one > #second .two > #deux #fourth .eight > #nine,
-#first > .one > #second .two > #deux #five .eight > #nine,
-#first > .one > #second .two > #deux #six .eight > #nine {
-  border: 1px solid black;
-}
-#first > .one > #second .two > #deux #fourth #ten,
-#first > .one > #second .two > #deux #five #ten,
-#first > .one > #second .two > #deux #six #ten {
-  color: red;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/scope.css b/test/Fixtures/lessjs (1.6)/css/scope.css
deleted file mode 100644
index baa05523..00000000
--- a/test/Fixtures/lessjs (1.6)/css/scope.css	
+++ /dev/null
@@ -1,35 +0,0 @@
-.tiny-scope {
-  color: #998899;
-}
-.scope1 {
-  color: #0000ff;
-  border-color: #000000;
-}
-.scope1 .scope2 {
-  color: #0000ff;
-}
-.scope1 .scope2 .scope3 {
-  color: #ff0000;
-  border-color: #000000;
-  background-color: #ffffff;
-}
-.scope {
-  scoped-val: #008000;
-}
-.heightIsSet {
-  height: 1024px;
-}
-.useHeightInMixinCall {
-  mixin-height: 1024px;
-}
-.imported {
-  exists: true;
-}
-.testImported {
-  exists: true;
-}
-#allAreUsedHere {
-  default: 'top level';
-  scope: 'top level';
-  sub-scope-only: 'inside';
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/selectors.css b/test/Fixtures/lessjs (1.6)/css/selectors.css
deleted file mode 100644
index ec855bec..00000000
--- a/test/Fixtures/lessjs (1.6)/css/selectors.css	
+++ /dev/null
@@ -1,153 +0,0 @@
-h1 a:hover,
-h2 a:hover,
-h3 a:hover,
-h1 p:hover,
-h2 p:hover,
-h3 p:hover {
-  color: red;
-}
-#all {
-  color: blue;
-}
-#the {
-  color: blue;
-}
-#same {
-  color: blue;
-}
-ul,
-li,
-div,
-q,
-blockquote,
-textarea {
-  margin: 0;
-}
-td {
-  margin: 0;
-  padding: 0;
-}
-td,
-input {
-  line-height: 1em;
-}
-a {
-  color: red;
-}
-a:hover {
-  color: blue;
-}
-div a {
-  color: green;
-}
-p a span {
-  color: yellow;
-}
-.foo .bar .qux,
-.foo .baz .qux {
-  display: block;
-}
-.qux .foo .bar,
-.qux .foo .baz {
-  display: inline;
-}
-.qux.foo .bar,
-.qux.foo .baz {
-  display: inline-block;
-}
-.qux .foo .bar .biz,
-.qux .foo .baz .biz {
-  display: none;
-}
-.a.b.c {
-  color: red;
-}
-.c .b.a {
-  color: red;
-}
-.foo .p.bar {
-  color: red;
-}
-.foo.p.bar {
-  color: red;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo,
-.foo + .bar,
-.bar + .foo,
-.bar + .bar {
-  background: amber;
-}
-.foo a > .foo a,
-.foo a > .bar a,
-.foo a > .foo b,
-.foo a > .bar b,
-.bar a > .foo a,
-.bar a > .bar a,
-.bar a > .foo b,
-.bar a > .bar b,
-.foo b > .foo a,
-.foo b > .bar a,
-.foo b > .foo b,
-.foo b > .bar b,
-.bar b > .foo a,
-.bar b > .bar a,
-.bar b > .foo b,
-.bar b > .bar b {
-  background: amber;
-}
-.other ::fnord {
-  color: #ff0000;
-}
-.other::fnord {
-  color: #ff0000;
-}
-.other ::bnord {
-  color: #ff0000;
-}
-.other::bnord {
-  color: #ff0000;
-}
-.blood {
-  color: red;
-}
-.bloodred {
-  color: green;
-}
-#blood.blood.red.black {
-  color: black;
-}
-:nth-child(3) {
-  selector: interpolated;
-}
-.test:nth-child(odd):not(:nth-child(3)) {
-  color: #ff0000;
-}
-[prop],
-[prop=10%],
-[prop="value3"],
-[prop*="val3"],
-[|prop~="val3"],
-[*|prop$="val3"],
-[ns|prop^="val3"],
-[3^="val3"],
-[3=3],
-[3] {
-  attributes: yes;
-}
-/*
-Large comment means chunk will be emitted after } which means chunk will begin with whitespace...
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-*/
-.blood {
-  color: red;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/static-urls/urls.css b/test/Fixtures/lessjs (1.6)/css/static-urls/urls.css
deleted file mode 100644
index ed174e87..00000000
--- a/test/Fixtures/lessjs (1.6)/css/static-urls/urls.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-@import "css/background.css";
-@import "folder (1)/import-test-d.css";
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium), url(folder\ \(1\)/fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-}
-#misc {
-  background-image: url(folder\ \(1\)/images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-}
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-.comma-delimited {
-  background: url(folder\ \(1\)/bg.jpg) no-repeat, url(folder\ \(1\)/bg.png) repeat-x top left, url(folder\ \(1\)/bg);
-}
-.values {
-  url: url('folder (1)/Trebuchet');
-}
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('assets/logo.png');
-}
-@font-face {
-  font-family: xecret;
-  src: url('assets/xecret.ttf');
-}
-#secret {
-  font-family: xecret, sans-serif;
-}
-#imported-relative-path {
-  background-image: url(../data/image.jpg);
-  border-image: url('../data/image.jpg');
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/strings.css b/test/Fixtures/lessjs (1.6)/css/strings.css
deleted file mode 100644
index cd6d6020..00000000
--- a/test/Fixtures/lessjs (1.6)/css/strings.css	
+++ /dev/null
@@ -1,43 +0,0 @@
-#strings {
-  background-image: url("http://son-of-a-banana.com");
-  quotes: "~" "~";
-  content: "#*%:&^,)!.(~*})";
-  empty: "";
-  brackets: "{" "}";
-  escapes: "\"hello\" \\world";
-  escapes2: "\"llo";
-}
-#comments {
-  content: "/* hello */ // not-so-secret";
-}
-#single-quote {
-  quotes: "'" "'";
-  content: '""#!&""';
-  empty: '';
-  semi-colon: ';';
-}
-#escaped {
-  filter: DX.Transform.MS.BS.filter(opacity=50);
-}
-#one-line {
-  image: url(http://tooks.com);
-}
-#crazy {
-  image: url(http://), "}", url("http://}");
-}
-#interpolation {
-  url: "http://lesscss.org/dev/image.jpg";
-  url2: "http://lesscss.org/image-256.jpg";
-  url3: "http://lesscss.org#445566";
-  url4: "http://lesscss.org/hello";
-  url5: "http://lesscss.org/54.4px";
-}
-.mix-mul-class {
-  color: #0000ff;
-  color: #ff0000;
-  color: #000000;
-  color: #ffa500;
-}
-.watermark {
-  family: Univers, Arial, Verdana, San-Serif;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/url-args/urls.css b/test/Fixtures/lessjs (1.6)/css/url-args/urls.css
deleted file mode 100644
index 0b4b13f3..00000000
--- a/test/Fixtures/lessjs (1.6)/css/url-args/urls.css	
+++ /dev/null
@@ -1,56 +0,0 @@
-@font-face {
-  src: url("/fonts/garamond-pro.ttf?424242");
-  src: local(Futura-Medium), url(fonts.svg?424242#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html?424242") no-repeat 0 4px;
-  background: url("img.jpg?424242") center / 100px;
-  background: #ffffff url(image.png?424242) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg?424242);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700&424242);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700&424242");
-}
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-.comma-delimited {
-  background: url(bg.jpg?424242) no-repeat, url(bg.png?424242) repeat-x top left, url(bg?424242);
-}
-.values {
-  url: url('Trebuchet?424242');
-}
-@font-face {
-  font-family: xecret;
-  src: url('../assets/xecret.ttf?424242');
-}
-#secret {
-  font-family: xecret, sans-serif;
-}
-#data-uri {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-guess {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-ascii {
-  uri-1: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-  uri-2: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-}
-#svg-functions {
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-}
-#data-uri-with-spaces {
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(' data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==');
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/urls.css b/test/Fixtures/lessjs (1.6)/css/urls.css
deleted file mode 100644
index cc7087d0..00000000
--- a/test/Fixtures/lessjs (1.6)/css/urls.css	
+++ /dev/null
@@ -1,71 +0,0 @@
-@import "css/background.css";
-@import "import/import-test-d.css";
-@import "file.css";
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium), url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-  background: url("img.jpg") center / 100px;
-  background: #ffffff url(image.png) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700");
-}
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-  url: url('Trebuchet');
-}
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('import/assets/logo.png');
-}
-@font-face {
-  font-family: xecret;
-  src: url('import/assets/xecret.ttf');
-}
-#secret {
-  font-family: xecret, sans-serif;
-}
-#imported-relative-path {
-  background-image: url(../data/image.jpg);
-  border-image: url('../data/image.jpg');
-}
-#relative-url-import {
-  background-image: url(../data/image.jpg);
-  border-image: url('../data/image.jpg');
-}
-#data-uri {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-guess {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-ascii {
-  uri-1: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-  uri-2: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-}
-#data-uri-toobig {
-  uri: url('../data/data-uri-fail.png');
-}
-#svg-functions {
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiA/PjxzdmcgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB2ZXJzaW9uPSIxLjEiIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiIHZpZXdCb3g9IjAgMCAxIDEiIHByZXNlcnZlQXNwZWN0UmF0aW89Im5vbmUiPjxsaW5lYXJHcmFkaWVudCBpZD0iZ3JhZGllbnQiIGdyYWRpZW50VW5pdHM9InVzZXJTcGFjZU9uVXNlIiB4MT0iMCUiIHkxPSIwJSIgeDI9IjAlIiB5Mj0iMTAwJSI+PHN0b3Agb2Zmc2V0PSIxJSIgc3RvcC1jb2xvcj0iI2M0YzRjNCIvPjxzdG9wIG9mZnNldD0iMyUiIHN0b3AtY29sb3I9IiNmZmE1MDAiLz48c3RvcCBvZmZzZXQ9IjUlIiBzdG9wLWNvbG9yPSIjMDA4MDAwIi8+PHN0b3Agb2Zmc2V0PSI5NSUiIHN0b3AtY29sb3I9IiNmZmZmZmYiLz48L2xpbmVhckdyYWRpZW50PjxyZWN0IHg9IjAiIHk9IjAiIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIGZpbGw9InVybCgjZ3JhZGllbnQpIiAvPjwvc3ZnPg==');
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/variables.css b/test/Fixtures/lessjs (1.6)/css/variables.css
deleted file mode 100644
index f8d8518b..00000000
--- a/test/Fixtures/lessjs (1.6)/css/variables.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.variables {
-  width: 14cm;
-}
-.variables {
-  height: 24px;
-  color: #888888;
-  font-family: "Trebuchet MS", Verdana, sans-serif;
-  quotes: "~" "~";
-}
-.redef {
-  zero: 0;
-}
-.redef .inition {
-  three: 3;
-}
-.values {
-  minus-one: -1;
-  font-family: 'Trebuchet', 'Trebuchet', 'Trebuchet';
-  color: #888888 !important;
-  multi: something 'A', B, C, 'Trebuchet';
-}
-.variable-names {
-  name: 'hello';
-}
-.alpha {
-  filter: alpha(opacity=42);
-}
-.testPollution {
-  a: 'no-pollution';
-}
-.units {
-  width: 1px;
-  same-unit-as-previously: 1px;
-  square-pixel-divided: 1px;
-  odd-unit: 2;
-  percentage: 500%;
-  pixels: 500px;
-  conversion-metric-a: 30mm;
-  conversion-metric-b: 3cm;
-  conversion-imperial: 3in;
-  custom-unit: 420octocats;
-  custom-unit-cancelling: 18dogs;
-  mix-units: 2px;
-  invalid-units: 1px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/css/whitespace.css b/test/Fixtures/lessjs (1.6)/css/whitespace.css
deleted file mode 100644
index 74c9b65e..00000000
--- a/test/Fixtures/lessjs (1.6)/css/whitespace.css	
+++ /dev/null
@@ -1,42 +0,0 @@
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white ;
-}
-.white,
-.space,
-.mania {
-  color: white;
-}
-.no-semi-column {
-  color: #ffffff;
-}
-.no-semi-column {
-  color: white;
-  white-space: pre;
-}
-.no-semi-column {
-  border: 2px solid #ffffff;
-}
-.newlines {
-  background: the,
-              great,
-              wall;
-  border: 2px
-          solid
-          black;
-}
-.sel .newline_ws .tab_ws {
-  color: white;
-  background-position: 45 -23;
-}
diff --git a/test/Fixtures/lessjs (1.6)/data/data-uri-fail.png b/test/Fixtures/lessjs (1.6)/data/data-uri-fail.png
deleted file mode 100644
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GIT binary patch
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diff --git a/test/Fixtures/lessjs (1.6)/data/image.jpg b/test/Fixtures/lessjs (1.6)/data/image.jpg
deleted file mode 100644
index 83f77790..00000000
--- a/test/Fixtures/lessjs (1.6)/data/image.jpg	
+++ /dev/null
@@ -1 +0,0 @@
-not actually a jpeg file
diff --git a/test/Fixtures/lessjs (1.6)/data/page.html b/test/Fixtures/lessjs (1.6)/data/page.html
deleted file mode 100644
index ccdfe565..00000000
--- a/test/Fixtures/lessjs (1.6)/data/page.html	
+++ /dev/null
@@ -1 +0,0 @@
-<h1>This page is 100% Awesome.</h1>
diff --git a/test/Fixtures/lessjs (1.6)/expected/charsets.css b/test/Fixtures/lessjs (1.6)/expected/charsets.css
deleted file mode 100644
index 9f44090c..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/charsets.css	
+++ /dev/null
@@ -1 +0,0 @@
-@charset "UTF-8";
diff --git a/test/Fixtures/lessjs (1.6)/expected/colors.css b/test/Fixtures/lessjs (1.6)/expected/colors.css
deleted file mode 100644
index 08a22abb..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/colors.css	
+++ /dev/null
@@ -1,87 +0,0 @@
-#yelow #short {
-  color: #fea;
-}
-#yelow #long {
-  color: #ffeeaa;
-}
-#yelow #rgba {
-  color: rgba(255, 238, 170, 0.1);
-}
-#yelow #argb {
-  color: #1affeeaa;
-}
-#blue #short {
-  color: #00f;
-}
-#blue #long {
-  color: #0000ff;
-}
-#blue #rgba {
-  color: rgba(0, 0, 255, 0.1);
-}
-#blue #argb {
-  color: #1a0000ff;
-}
-#alpha #hsla {
-  color: rgba(61, 45, 41, 0.6);
-}
-#overflow .a {
-  color: #000000;
-}
-#overflow .b {
-  color: #ffffff;
-}
-#overflow .c {
-  color: #ffffff;
-}
-#overflow .d {
-  color: #00ff00;
-}
-#overflow .e {
-  color: rgba(0, 31, 255, 0.42);
-}
-#grey {
-  color: #c8c8c8;
-}
-#333333 {
-  color: #333333;
-}
-#808080 {
-  color: #808080;
-}
-#00ff00 {
-  color: #00ff00;
-}
-.lightenblue {
-  color: #3333ff;
-}
-.darkenblue {
-  color: #0000cc;
-}
-.unknowncolors {
-  color: blue2;
-  border: 2px solid superred;
-}
-.transparent {
-  color: transparent;
-  background-color: rgba(0, 0, 0, 0);
-}
-#alpha #fromvar {
-  opacity: 0.7;
-}
-#alpha #short {
-  opacity: 1;
-}
-#alpha #long {
-  opacity: 1;
-}
-#alpha #rgba {
-  opacity: 0.2;
-}
-#alpha #hsl {
-  opacity: 1;
-}
-#percentage {
-  color: 255;
-  border-color: rgba(255, 0, 0, 0.5);
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/comments.css b/test/Fixtures/lessjs (1.6)/expected/comments.css
deleted file mode 100644
index b7670230..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/comments.css	
+++ /dev/null
@@ -1,69 +0,0 @@
-/******************\
-*                  *
-*  Comment Header  *
-*                  *
-\******************/
-/*
-
-    Comment
-
-*/
-/*
- * Comment Test
- *
- * - cloudhead (http://cloudhead.net)
- *
- */
-/* Colors
- * ------
- *   #EDF8FC (background blue)
- *   #166C89 (darkest blue)
- *
- * Text:
- *   #333 (standard text) // A comment within a comment!
- *   #1F9EC9 (standard link)
- *
- */
-/* @group Variables
-------------------- */
-#comments,
-.comments {
-  /**/
-  color: red;
-  /* A C-style comment */
-  /* A C-style comment */
-  background-color: orange;
-  font-size: 12px;
-  /* lost comment */
-  content: "content";
-  border: 1px solid black;
-  padding: 0;
-  margin: 2em;
-}
-/* commented out
-  #more-comments {
-    color: grey;
-  }
-*/
-.selector,
-.lots,
-.comments {
-  color: #808080, /* blue */ #ffa500;
-  -webkit-border-radius: 2px /* webkit only */;
-  -moz-border-radius: 8px /* moz only with operation */;
-}
-.test {
-  color: 1px;
-}
-#last {
-  color: blue;
-}
-/*  */
-/* { */
-/*  */
-/*  */
-/*  */
-#div {
-  color: #A33;
-}
-/* } */
diff --git a/test/Fixtures/lessjs (1.6)/expected/css-3.css b/test/Fixtures/lessjs (1.6)/expected/css-3.css
deleted file mode 100644
index 61f635c2..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/css-3.css	
+++ /dev/null
@@ -1,129 +0,0 @@
-.comma-delimited {
-  text-shadow: -1px -1px 1px #ff0000, 6px 5px 5px #ffff00;
-  -moz-box-shadow: 0pt 0pt 2px rgba(255, 255, 255, 0.4) inset, 0pt 4px 6px rgba(255, 255, 255, 0.4) inset;
-  -webkit-transform: rotate(0deg);
-}
-@font-face {
-  font-family: Headline;
-  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
-}
-.other {
-  -moz-transform: translate(0, 11em) rotate(-90deg);
-  transform: rotateX(45deg);
-}
-.item[data-cra_zy-attr1b-ut3=bold] {
-  font-weight: bold;
-}
-p:not([class*="lead"]) {
-  color: black;
-}
-input[type="text"].class#id[attr=32]:not(1) {
-  color: white;
-}
-div#id.class[a=1][b=2].class:not(1) {
-  color: white;
-}
-ul.comma > li:not(:only-child)::after {
-  color: white;
-}
-ol.comma > li:nth-last-child(2)::after {
-  color: white;
-}
-li:nth-child(4n+1),
-li:nth-child(-5n),
-li:nth-child(-n+2) {
-  color: white;
-}
-a[href^="http://"] {
-  color: black;
-}
-a[href$="http://"] {
-  color: black;
-}
-form[data-disabled] {
-  color: black;
-}
-p::before {
-  color: black;
-}
-#issue322 {
-  -webkit-animation: anim2 7s infinite ease-in-out;
-}
-@-webkit-keyframes frames {
-  0% {
-    border: 1px;
-  }
-  5.5% {
-    border: 2px;
-  }
-  100% {
-    border: 3px;
-  }
-}
-@keyframes fontbulger1 {
-  to {
-    font-size: 15px;
-  }
-  from,
-  to {
-    font-size: 12px;
-  }
-  0%,
-  100% {
-    font-size: 12px;
-  }
-}
-.units {
-  font: 1.2rem/2rem;
-  font: 8vw/9vw;
-  font: 10vh/12vh;
-  font: 12vm/15vm;
-  font: 12vmin/15vmin;
-  font: 1.2ch/1.5ch;
-}
-@supports ( box-shadow: 2px 2px 2px black ) or
-          ( -moz-box-shadow: 2px 2px 2px black ) {
-  .outline {
-    box-shadow: 2px 2px 2px black;
-    -moz-box-shadow: 2px 2px 2px black;
-  }
-}
-@-x-document url-prefix(""github.com"") {
-  h1 {
-    color: red;
-  }
-}
-@viewport {
-  font-size: 10px;
-}
-@namespace foo url(http://www.example.com);
-foo|h1 {
-  color: blue;
-}
-foo|* {
-  color: yellow;
-}
-|h1 {
-  color: red;
-}
-*|h1 {
-  color: green;
-}
-h1 {
-  color: green;
-}
-.upper-test {
-  UpperCaseProperties: allowed;
-}
-@host {
-  div {
-    display: block;
-  }
-}
-::distributed(input::placeholder) {
-  color: #b3b3b3;
-}
-.shadow ^ .dom,
-body ^^ .shadow {
-  display: done;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/css-escapes.css b/test/Fixtures/lessjs (1.6)/expected/css-escapes.css
deleted file mode 100644
index 4d343aa6..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/css-escapes.css	
+++ /dev/null
@@ -1,24 +0,0 @@
-.escape\|random\|char {
-  color: red;
-}
-.mixin\!tUp {
-  font-weight: bold;
-}
-.\34 04 {
-  background: red;
-}
-.\34 04 strong {
-  color: #ff00ff;
-  font-weight: bold;
-}
-.trailingTest\+ {
-  color: red;
-}
-/* This hideous test of hideousness checks for the selector "blockquote" with various permutations of hex escapes */
-\62\6c\6f \63 \6B \0071 \000075o\74 e {
-  color: silver;
-}
-[ng\:cloak],
-ng\:form {
-  display: none;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/css-guards.css b/test/Fixtures/lessjs (1.6)/expected/css-guards.css
deleted file mode 100644
index f4b8a108..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/css-guards.css	
+++ /dev/null
@@ -1,37 +0,0 @@
-.light {
-  color: green;
-}
-.see-the {
-  color: green;
-}
-.hide-the {
-  color: green;
-}
-.multiple-conditions-1 {
-  color: red;
-}
-.inheritance .test {
-  color: black;
-}
-.inheritance:hover {
-  color: pink;
-}
-.clsWithGuard {
-  dispaly: none;
-}
-.dont-split-me-up {
-  width: 1px;
-  color: red;
-  height: 1px;
-}
- + .dont-split-me-up {
-  sibling: true;
-}
-.scope-check {
-  sub-prop: 2px;
-  prop: 1px;
-}
-.scope-check-2 {
-  sub-prop: 2px;
-  prop: 1px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/css.css b/test/Fixtures/lessjs (1.6)/expected/css.css
deleted file mode 100644
index 24040ff3..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/css.css	
+++ /dev/null
@@ -1,95 +0,0 @@
-@charset "utf-8";
-div {
-  color: black;
-}
-div {
-  width: 99%;
-}
-* {
-  min-width: 45em;
-}
-h1,
-h2 > a > p,
-h3 {
-  color: none;
-}
-div.class {
-  color: blue;
-}
-div#id {
-  color: green;
-}
-.class#id {
-  color: purple;
-}
-.one.two.three {
-  color: grey;
-}
-@media print {
-  * {
-    font-size: 3em;
-  }
-}
-@media screen {
-  * {
-    font-size: 10px;
-  }
-}
-@font-face {
-  font-family: 'Garamond Pro';
-}
-a:hover,
-a:link {
-  color: #999;
-}
-p,
-p:first-child {
-  text-transform: none;
-}
-q:lang(no) {
-  quotes: none;
-}
-p + h1 {
-  font-size: 2.2em;
-}
-#shorthands {
-  border: 1px solid #000;
-  font: 12px/16px Arial;
-  font: 100%/16px Arial;
-  margin: 1px 0;
-  padding: 0 auto;
-}
-#more-shorthands {
-  margin: 0;
-  padding: 1px 0 2px 0;
-  font: normal small / 20px 'Trebuchet MS', Verdana, sans-serif;
-  font: 0/0 a;
-  border-radius: 0.5px;
-}
-.misc {
-  -moz-border-radius: 2px;
-  display: -moz-inline-stack;
-  width: .1em;
-  background-color: #009998;
-  background: -webkit-gradient(linear, left top, left bottom, from(#ff0000), to(#0000ff));
-  margin: ;
-  filter: alpha(opacity=100);
-  width: auto\9;
-}
-.misc .nested-multiple {
-  multiple-semi-colons: yes;
-}
-#important {
-  color: red !important;
-  width: 100% !important;
-  height: 20px !important;
-}
-@font-face {
-  font-family: font-a;
-}
-@font-face {
-  font-family: font-b;
-}
-.æøå {
-  margin: 0;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/empty.css b/test/Fixtures/lessjs (1.6)/expected/empty.css
deleted file mode 100644
index 8b137891..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/empty.css	
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/test/Fixtures/lessjs (1.6)/expected/extend-chaining.css b/test/Fixtures/lessjs (1.6)/expected/extend-chaining.css
deleted file mode 100644
index 820e134f..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extend-chaining.css	
+++ /dev/null
@@ -1,81 +0,0 @@
-.a,
-.b,
-.c {
-  color: black;
-}
-.f,
-.e,
-.d {
-  color: black;
-}
-.g.h,
-.i.j.h,
-.k.j.h {
-  color: black;
-}
-.i.j,
-.k.j {
-  color: white;
-}
-.l,
-.m,
-.n,
-.o,
-.p,
-.q,
-.r,
-.s,
-.t {
-  color: black;
-}
-.u,
-.v.u.v {
-  color: black;
-}
-.w,
-.v.w.v {
-  color: black;
-}
-.x,
-.y,
-.z {
-  color: x;
-}
-.y,
-.z,
-.x {
-  color: y;
-}
-.z,
-.x,
-.y {
-  color: z;
-}
-.va,
-.vb,
-.vc {
-  color: black;
-}
-.vb,
-.vc {
-  color: white;
-}
-@media tv {
-  .ma,
-  .mb,
-  .mc {
-    color: black;
-  }
-  .md,
-  .ma,
-  .mb,
-  .mc {
-    color: white;
-  }
-}
-@media tv and plasma {
-  .me,
-  .mf {
-    background: red;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/extend-clearfix.css b/test/Fixtures/lessjs (1.6)/expected/extend-clearfix.css
deleted file mode 100644
index 966892a2..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extend-clearfix.css	
+++ /dev/null
@@ -1,19 +0,0 @@
-.clearfix,
-.foo,
-.bar {
-  *zoom: 1;
-}
-.clearfix:after,
-.foo:after,
-.bar:after {
-  content: '';
-  display: block;
-  clear: both;
-  height: 0;
-}
-.foo {
-  color: red;
-}
-.bar {
-  color: blue;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/extend-exact.css b/test/Fixtures/lessjs (1.6)/expected/extend-exact.css
deleted file mode 100644
index beff4133..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extend-exact.css	
+++ /dev/null
@@ -1,37 +0,0 @@
-.replace.replace .replace,
-.c.replace + .replace .replace,
-.replace.replace .c,
-.c.replace + .replace .c,
-.rep_ace {
-  prop: copy-paste-replace;
-}
-.a .b .c {
-  prop: not_effected;
-}
-.a,
-.effected {
-  prop: is_effected;
-}
-.a .b {
-  prop: not_effected;
-}
-.a .b.c {
-  prop: not_effected;
-}
-.c .b .a,
-.a .b .a,
-.c .a .a,
-.a .a .a,
-.c .b .c,
-.a .b .c,
-.c .a .c,
-.a .a .c {
-  prop: not_effected;
-}
-.e.e,
-.dbl {
-  prop: extend-double;
-}
-.e.e:hover {
-  hover: not-extended;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/extend-media.css b/test/Fixtures/lessjs (1.6)/expected/extend-media.css
deleted file mode 100644
index 23bd7b85..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extend-media.css	
+++ /dev/null
@@ -1,24 +0,0 @@
-.ext1 .ext2,
-.all .ext2 {
-  background: black;
-}
-@media tv {
-  .ext1 .ext3,
-  .tv-lowres .ext3,
-  .all .ext3 {
-    color: white;
-  }
-  .tv-lowres {
-    background: blue;
-  }
-}
-@media tv and hires {
-  .ext1 .ext4,
-  .tv-hires .ext4,
-  .all .ext4 {
-    color: green;
-  }
-  .tv-hires {
-    background: red;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/extend-nest.css b/test/Fixtures/lessjs (1.6)/expected/extend-nest.css
deleted file mode 100644
index 2c3905d9..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extend-nest.css	
+++ /dev/null
@@ -1,57 +0,0 @@
-.sidebar,
-.sidebar2,
-.type1 .sidebar3,
-.type2.sidebar4 {
-  width: 300px;
-  background: red;
-}
-.sidebar .box,
-.sidebar2 .box,
-.type1 .sidebar3 .box,
-.type2.sidebar4 .box {
-  background: #FFF;
-  border: 1px solid #000;
-  margin: 10px 0;
-}
-.sidebar2 {
-  background: blue;
-}
-.type1 .sidebar3 {
-  background: green;
-}
-.type2.sidebar4 {
-  background: red;
-}
-.button,
-.submit {
-  color: black;
-}
-.button:hover,
-.submit:hover {
-  color: white;
-}
-.button2 :hover {
-  nested: white;
-}
-.button2 :hover {
-  notnested: black;
-}
-.amp-test-h,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-a.amp-test-d.amp-test-b.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-a.amp-test-e.amp-test-g,
-.amp-test-f.amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e + .amp-test-c .amp-test-b.amp-test-d.amp-test-b.amp-test-e.amp-test-g {
-  test: extended by masses of selectors;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/extend-selector.css b/test/Fixtures/lessjs (1.6)/expected/extend-selector.css
deleted file mode 100644
index da47254b..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extend-selector.css	
+++ /dev/null
@@ -1,80 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion,
-.badError.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error,
-.intrusion .badError {
-  display: none;
-}
-.badError {
-  border-width: 3px;
-}
-.foo .bar,
-.foo .baz,
-.ext1 .ext2 .bar,
-.ext1 .ext2 .baz,
-.ext3 .bar,
-.ext3 .baz,
-.ext4 .bar,
-.ext4 .baz {
-  display: none;
-}
-div.ext5,
-.ext6 > .ext5,
-div.ext7,
-.ext6 > .ext7 {
-  width: 100px;
-}
-.ext,
-.a .c,
-.b .c {
-  test: 1;
-}
-.a,
-.b {
-  test: 2;
-}
-.a .c,
-.b .c {
-  test: 3;
-}
-.a .c .d,
-.b .c .d {
-  test: 4;
-}
-.replace.replace .replace,
-.c.replace + .replace .replace,
-.replace.replace .c,
-.c.replace + .replace .c,
-.rep_ace.rep_ace .rep_ace,
-.c.rep_ace + .rep_ace .rep_ace,
-.rep_ace.rep_ace .c,
-.c.rep_ace + .rep_ace .c {
-  prop: copy-paste-replace;
-}
-.attributes [data="test"],
-.attributes .attributes .attribute-test {
-  extend: attributes;
-}
-.attributes [data],
-.attributes .attributes .attribute-test2 {
-  extend: attributes2;
-}
-.attributes [data="test3"],
-.attributes .attributes .attribute-test {
-  extend: attributes2;
-}
-.header .header-nav,
-.footer .footer-nav {
-  background: red;
-}
-.header .header-nav:before,
-.footer .footer-nav:before {
-  background: blue;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/extend.css b/test/Fixtures/lessjs (1.6)/expected/extend.css
deleted file mode 100644
index 2895641a..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extend.css	
+++ /dev/null
@@ -1,76 +0,0 @@
-.error,
-.badError {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion,
-.badError.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error,
-.intrusion .badError {
-  display: none;
-}
-.badError {
-  border-width: 3px;
-}
-.foo .bar,
-.foo .baz,
-.ext1 .ext2 .bar,
-.ext1 .ext2 .baz,
-.ext3 .bar,
-.ext3 .baz,
-.foo .ext3,
-.ext4 .bar,
-.ext4 .baz,
-.foo .ext4 {
-  display: none;
-}
-div.ext5,
-.ext6 > .ext5,
-div.ext7,
-.ext6 > .ext7 {
-  width: 100px;
-}
-.ext8.ext9,
-.fuu {
-  result: add-foo;
-}
-.ext8 .ext9,
-.ext8 + .ext9,
-.ext8 > .ext9,
-.buu,
-.zap,
-.zoo {
-  result: bar-matched;
-}
-.ext8.nomatch {
-  result: none;
-}
-.ext8 .ext9,
-.buu {
-  result: match-nested-bar;
-}
-.ext8.ext9,
-.fuu {
-  result: match-nested-foo;
-}
-.aa,
-.cc {
-  color: black;
-}
-.aa .dd,
-.aa .ee {
-  background: red;
-}
-.bb,
-.cc,
-.ee,
-.ff {
-  background: red;
-}
-.bb .bb,
-.ff .ff {
-  color: black;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/extract-and-length.css b/test/Fixtures/lessjs (1.6)/expected/extract-and-length.css
deleted file mode 100644
index f550e201..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/extract-and-length.css	
+++ /dev/null
@@ -1,133 +0,0 @@
-.multiunit {
-  length: 6;
-  extract: abc "abc" 1 1px 1% #112233;
-}
-.incorrect-index {
-  v1: extract(a b c, 5);
-  v2: extract(a, b, c, -2);
-}
-.scalar {
-  var-value: variable;
-  var-length: 1;
-  ill-index: extract(variable, 2);
-  name-value: name;
-  string-value: "string";
-  number-value: 12345678;
-  color-value: #0000ff;
-  rgba-value: rgba(80, 160, 240, 0.67);
-  empty-value: ;
-  name-length: 1;
-  string-length: 1;
-  number-length: 1;
-  color-length: 1;
-  rgba-length: 1;
-  empty-length: 1;
-}
-.mixin-arguments-1 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-4 {
-  length: 0;
-  extract: extract(, 2) | extract(, 1);
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: c | b | a;
-}
-.mixin-arguments-4 {
-  length: 3;
-  extract: c | b;
-}
-.mixin-arguments-2 {
-  length: 4;
-  extract: 3 | 2 | 1;
-}
-.mixin-arguments-3 {
-  length: 4;
-  extract: 3 | 2 | 1;
-}
-.mixin-arguments-4 {
-  length: 3;
-  extract: 3 | 2;
-}
-.md-space-comma {
-  length-1: 3;
-  extract-1: 1 2 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-space-comma-as-args-2 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-space-comma-as-args-3 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-space-comma-as-args-4 {
-  length: 2;
-  extract: "x" "y" "z" | 1 2 3;
-}
-.md-cat-space-comma {
-  length-1: 3;
-  extract-1: 1 2 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-cat-space-comma-as-args-2 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-cat-space-comma-as-args-3 {
-  length: 3;
-  extract: "x" "y" "z" | 1 2 3 | a b c;
-}
-.md-cat-space-comma-as-args-4 {
-  length: 2;
-  extract: "x" "y" "z" | 1 2 3;
-}
-.md-cat-comma-space {
-  length-1: 3;
-  extract-1: 1, 2, 3;
-  length-2: 3;
-  extract-2: 2;
-}
-.md-cat-comma-space-as-args-1 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-2 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-3 {
-  length: 3;
-  extract: "x", "y", "z" | 1, 2, 3 | a, b, c;
-}
-.md-cat-comma-space-as-args-4 {
-  length: 0;
-  extract: extract(, 2) | extract(, 1);
-}
-.md-3D {
-  length-1: 2;
-  extract-1: a b c d, 1 2 3 4;
-  length-2: 2;
-  extract-2: 5 6 7 8;
-  length-3: 4;
-  extract-3: 7;
-  length-4: 1;
-  extract-4: 8;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/functions.css b/test/Fixtures/lessjs (1.6)/expected/functions.css
deleted file mode 100644
index afa6448e..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/functions.css	
+++ /dev/null
@@ -1,141 +0,0 @@
-#functions {
-  color: _color("evil red");
-  width: increment(15);
-  height: undefined("self");
-  border-width: add(2, 3);
-  variable: increment(10);
-  background: linear-gradient(#000000, #ffffff);
-}
-#built-in {
-  escaped: -Some::weird(#thing, y);
-  lighten: #ffcccc;
-  darken: #330000;
-  saturate: #203c31;
-  desaturate: #29332f;
-  greyscale: #2e2e2e;
-  hsl-clamp: #ffffff;
-  spin-p: #bf6a40;
-  spin-n: #bf4055;
-  luma-white: 100%;
-  luma-black: 0%;
-  luma-black-alpha: 0%;
-  luma-red: 21%;
-  luma-green: 72%;
-  luma-blue: 7%;
-  luma-yellow: 93%;
-  luma-cyan: 79%;
-  luma-white-alpha: 50%;
-  contrast-filter: contrast(30%);
-  saturate-filter: saturate(5%);
-  contrast-white: #000000;
-  contrast-black: #ffffff;
-  contrast-red: #ffffff;
-  contrast-green: #000000;
-  contrast-blue: #ffffff;
-  contrast-yellow: #000000;
-  contrast-cyan: #000000;
-  contrast-light: #111111;
-  contrast-dark: #eeeeee;
-  contrast-wrongorder: #111111;
-  contrast-light-thresh: #111111;
-  contrast-dark-thresh: #eeeeee;
-  contrast-high-thresh: #eeeeee;
-  contrast-low-thresh: #111111;
-  contrast-light-thresh-per: #111111;
-  contrast-dark-thresh-per: #eeeeee;
-  contrast-high-thresh-per: #eeeeee;
-  contrast-low-thresh-per: #111111;
-  format: "rgb(32, 128, 64)";
-  format-string: "hello world";
-  format-multiple: "hello earth 2";
-  format-url-encode: "red is %23ff0000";
-  eformat: rgb(32, 128, 64);
-  unitless: 12;
-  unit: 14em;
-  hue: 98;
-  saturation: 12%;
-  lightness: 95%;
-  hsvhue: 98;
-  hsvsaturation: 12%;
-  hsvvalue: 95%;
-  red: 255;
-  green: 255;
-  blue: 255;
-  rounded: 11;
-  rounded-two: 10.67;
-  roundedpx: 3px;
-  roundedpx-three: 3.333px;
-  rounded-percentage: 10%;
-  ceil: 11px;
-  floor: 12px;
-  sqrt: 5px;
-  pi: 3.14159265;
-  mod: 2m;
-  abs: 4%;
-  tan: 0.90040415;
-  sin: 0.17364819;
-  cos: 0.84385396;
-  atan: 0.1rad;
-  atan: 34deg;
-  atan: 44.9999964deg;
-  pow: 64px;
-  pow: 64;
-  pow: 27;
-  min: 0;
-  min: min("junk", 5);
-  min: 3pt;
-  max: 3;
-  max: max(8%, 1cm);
-  percentage: 20%;
-  color: #ff0011;
-  tint: #898989;
-  tint-full: #ffffff;
-  tint-percent: #898989;
-  tint-negative: #656565;
-  shade: #686868;
-  shade-full: #000000;
-  shade-percent: #686868;
-  shade-negative: #868686;
-  fade-out: rgba(255, 0, 0, 0.95);
-  fade-in: rgba(255, 0, 0, 0.95);
-  hsv: #4d2926;
-  hsva: rgba(77, 40, 38, 0.2);
-  mix: #ff3300;
-  mix-0: #ffff00;
-  mix-100: #ff0000;
-  mix-weightless: #ff8000;
-  mixt: rgba(255, 0, 0, 0.5);
-}
-#built-in .is-a {
-  color: true;
-  color1: true;
-  color2: true;
-  color3: true;
-  keyword: true;
-  number: true;
-  string: true;
-  pixel: true;
-  percent: true;
-  em: true;
-  cat: true;
-}
-#alpha {
-  alpha: rgba(153, 94, 51, 0.6);
-  alpha2: 0.5;
-  alpha3: 0;
-}
-#blendmodes {
-  multiply: #ed0000;
-  screen: #f600f6;
-  overlay: #ed0000;
-  softlight: #fa0000;
-  hardlight: #0000ed;
-  difference: #f600f6;
-  exclusion: #f600f6;
-  average: #7b007b;
-  negation: #d73131;
-}
-#extract-and-length {
-  extract: 3 2 1 C B A;
-  length: 6;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/ie-filters.css b/test/Fixtures/lessjs (1.6)/expected/ie-filters.css
deleted file mode 100644
index 007aa536..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/ie-filters.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.nav {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=20);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0);
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#333333", endColorstr="#000000", GradientType=0);
-}
-.evalTest1 {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=30);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=5);
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/import-inline.css b/test/Fixtures/lessjs (1.6)/expected/import-inline.css
deleted file mode 100644
index f198d3c1..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/import-inline.css	
+++ /dev/null
@@ -1,5 +0,0 @@
-this isn't very valid CSS.
-@media (min-width: 600px) {
-  #css { color: yellow; }
-
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/import-interpolation.css b/test/Fixtures/lessjs (1.6)/expected/import-interpolation.css
deleted file mode 100644
index 16b7a150..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/import-interpolation.css	
+++ /dev/null
@@ -1,6 +0,0 @@
-body {
-  width: 100%;
-}
-.a {
-  var: test;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/import-once.css b/test/Fixtures/lessjs (1.6)/expected/import-once.css
deleted file mode 100644
index 2f86b3b3..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/import-once.css	
+++ /dev/null
@@ -1,15 +0,0 @@
-#import {
-  color: #ff0000;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
-body {
-  width: 100%;
-}
-.test-f {
-  height: 10px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/import-reference.css b/test/Fixtures/lessjs (1.6)/expected/import-reference.css
deleted file mode 100644
index d61df816..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/import-reference.css	
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
-  The media statement above is invalid (no selector)
-  We should ban invalid media queries with properties and no selector?
-*/
-.visible {
-  color: red;
-}
-.visible .c {
-  color: green;
-}
-.visible {
-  color: green;
-}
-.visible:hover {
-  color: green;
-}
-.only-with-visible + .visible,
-.visible + .only-with-visible,
-.visible + .visible {
-  color: green;
-}
-.only-with-visible + .visible .sub,
-.visible + .only-with-visible .sub,
-.visible + .visible .sub {
-  color: green;
-}
-.b {
-  color: red;
-  color: green;
-}
-.b .c {
-  color: green;
-}
-.b:hover {
-  color: green;
-}
-.b + .b {
-  color: green;
-}
-.b + .b .sub {
-  color: green;
-}
-.y {
-  pulled-in: yes;
-}
-/* comment pulled in */
-.visible {
-  extend: test;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/import.css b/test/Fixtures/lessjs (1.6)/expected/import.css
deleted file mode 100644
index a3749181..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/import.css	
+++ /dev/null
@@ -1,36 +0,0 @@
-@import url(http://fonts.googleapis.com/css?family=Open+Sans);
-@import url(/absolute/something.css) screen and (color) and (max-width: 600px);
-@import url("//ha.com/file.css") (min-width: 100px);
-#import-test {
-  height: 10px;
-  color: #ff0000;
-  width: 10px;
-  height: 30%;
-}
-@media screen and (max-width: 600px) {
-  body {
-    width: 100%;
-  }
-}
-#import {
-  color: #ff0000;
-}
-.mixin {
-  height: 10px;
-  color: #ff0000;
-}
-@media screen and (max-width: 601px) {
-  #css {
-    color: yellow;
-  }
-}
-@media screen and (max-width: 602px) {
-  body {
-    width: 100%;
-  }
-}
-@media screen and (max-width: 603px) {
-  #css {
-    color: yellow;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/javascript.css b/test/Fixtures/lessjs (1.6)/expected/javascript.css
deleted file mode 100644
index ba09e148..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/javascript.css	
+++ /dev/null
@@ -1,20 +0,0 @@
-.eval {
-  js: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  title: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  ternary: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  multiline: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.scope {
-  var: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  escaped: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.vars {
-  width: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.escape-interpol {
-  width: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
-.arrays {
-  ary: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-  ary1: /* Sorry, can not do JavaScript evaluation in PHP... :( */;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/lazy-eval.css b/test/Fixtures/lessjs (1.6)/expected/lazy-eval.css
deleted file mode 100644
index 1adfb8f3..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/lazy-eval.css	
+++ /dev/null
@@ -1,3 +0,0 @@
-.lazy-eval {
-  width: 100%;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/media.css b/test/Fixtures/lessjs (1.6)/expected/media.css
deleted file mode 100644
index 607f0e44..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/media.css	
+++ /dev/null
@@ -1,219 +0,0 @@
-@media print {
-  .class {
-    color: blue;
-  }
-  .class .sub {
-    width: 42;
-  }
-  .top,
-  header > h1 {
-    color: #444444;
-  }
-}
-@media screen {
-  body {
-    max-width: 480;
-  }
-}
-@media all and (device-aspect-ratio: 16 / 9) {
-  body {
-    max-width: 800px;
-  }
-}
-@media all and (orientation: portrait) {
-  aside {
-    float: none;
-  }
-}
-@media handheld and (min-width: 42), screen and (min-width: 20em) {
-  body {
-    max-width: 480px;
-  }
-}
-@media print {
-  body {
-    padding: 20px;
-  }
-  body header {
-    background-color: red;
-  }
-}
-@media print and (orientation: landscape) {
-  body {
-    margin-left: 20px;
-  }
-}
-@media screen {
-  .sidebar {
-    width: 300px;
-  }
-}
-@media screen and (orientation: landscape) {
-  .sidebar {
-    width: 500px;
-  }
-}
-@media a and b {
-  .first .second .third {
-    width: 300px;
-  }
-  .first .second .fourth {
-    width: 3;
-  }
-}
-@media a and b and c {
-  .first .second .third {
-    width: 500px;
-  }
-}
-@media a, b and c {
-  body {
-    width: 95%;
-  }
-}
-@media a and x, b and c and x, a and y, b and c and y {
-  body {
-    width: 100%;
-  }
-}
-.a {
-  background: black;
-}
-@media handheld {
-  .a {
-    background: white;
-  }
-}
-@media handheld and (max-width: 100px) {
-  .a {
-    background: red;
-  }
-}
-.b {
-  background: black;
-}
-@media handheld {
-  .b {
-    background: white;
-  }
-}
-@media handheld and (max-width: 200px) {
-  .b {
-    background: red;
-  }
-}
-@media only screen and (max-width: 200px) {
-  body {
-    width: 480px;
-  }
-}
-@media print {
-  @page :left {
-    margin: 0.5cm;
-  }
-  @page :right {
-    margin: 0.5cm;
-  }
-  @page Test:first {
-    margin: 1cm;
-  }
-  @page :first {
-    size: 8.5in 11in;
-    
-    @top-left {
-      margin: 1cm;
-    }
-    @top-left-corner {
-      margin: 1cm;
-    }
-    @top-center {
-      margin: 1cm;
-    }
-    @top-right {
-      margin: 1cm;
-    }
-    @top-right-corner {
-      margin: 1cm;
-    }
-    @bottom-left {
-      margin: 1cm;
-    }
-    @bottom-left-corner {
-      margin: 1cm;
-    }
-    @bottom-center {
-      margin: 1cm;
-    }
-    @bottom-right {
-      margin: 1cm;
-    }
-    @bottom-right-corner {
-      margin: 1cm;
-    }
-    @left-top {
-      margin: 1cm;
-    }
-    @left-middle {
-      margin: 1cm;
-    }
-    @left-bottom {
-      margin: 1cm;
-    }
-    @right-top {
-      margin: 1cm;
-    }
-    @right-middle {
-      content: "Page " counter(page);
-    }
-    @right-bottom {
-      margin: 1cm;
-    }
-  }
-}
-@media (-webkit-min-device-pixel-ratio: 2), (min--moz-device-pixel-ratio: 2), (-o-min-device-pixel-ratio: 2/1), (min-resolution: 2dppx), (min-resolution: 128dpcm) {
-  .b {
-    background: red;
-  }
-}
-body {
-  background: red;
-}
-@media (max-width: 500px) {
-  body {
-    background: green;
-  }
-}
-@media (max-width: 1000px) {
-  body {
-    background: red;
-    background: blue;
-  }
-}
-@media (max-width: 1000px) and (max-width: 500px) {
-  body {
-    background: green;
-  }
-}
-@media (max-width: 1200px) {
-  /* a comment */
-}
-@media (max-width: 1200px) and (max-width: 900px) {
-  body {
-    font-size: 11px;
-  }
-}
-@media (min-width: 480px) {
-  .nav-justified > li {
-    display: table-cell;
-  }
-}
-@media (min-width: 768px) and (min-width: 480px) {
-  .menu > li {
-    display: table-cell;
-  }
-}
-@media all and tv {
-  .all-and-tv-variables {
-    var: all-and-tv;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/merge.css b/test/Fixtures/lessjs (1.6)/expected/merge.css
deleted file mode 100644
index 18539f1a..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/merge.css	
+++ /dev/null
@@ -1,26 +0,0 @@
-.test1 {
-  transform: rotate(90deg), skew(30deg), scale(2, 4);
-}
-.test2 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scaleX(45deg);
-}
-.test3 {
-  transform: scaleX(45deg);
-  background: url(data://img1.png);
-}
-.test4 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test5 {
-  transform: rotate(90deg), skew(30deg);
-  transform: scale(2, 4) !important;
-}
-.test6 {
-  transform: scale(2, 4);
-}
-.test-interleaved {
-  transform: t1, t2, t3;
-  background: b1, b2, b3;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-args.css b/test/Fixtures/lessjs (1.6)/expected/mixins-args.css
deleted file mode 100644
index 724613ad..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-args.css	
+++ /dev/null
@@ -1,113 +0,0 @@
-#hidden {
-  color: transparent;
-}
-#hidden1 {
-  color: transparent;
-}
-.two-args {
-  color: blue;
-  width: 10px;
-  height: 99%;
-  border: 2px dotted #000000;
-}
-.one-arg {
-  width: 15px;
-  height: 49%;
-}
-.no-parens {
-  width: 5px;
-  height: 49%;
-}
-.no-args {
-  width: 5px;
-  height: 49%;
-}
-.var-args {
-  width: 45;
-  height: 17%;
-}
-.multi-mix {
-  width: 10px;
-  height: 29%;
-  margin: 4;
-  padding: 5;
-}
-body {
-  padding: 30px;
-  color: #ff0000;
-}
-.scope-mix {
-  width: 8;
-}
-.content {
-  width: 600px;
-}
-.content .column {
-  margin: 600px;
-}
-#same-var-name {
-  radius: 5px;
-}
-#var-inside {
-  width: 10px;
-}
-.arguments {
-  border: 1px solid #000000;
-  width: 1px;
-}
-.arguments2 {
-  border: 0px;
-  width: 0px;
-}
-.arguments3 {
-  border: 0px;
-  width: 0px;
-}
-.arguments4 {
-  border: 0 1 2 3 4;
-  rest: 1 2 3 4;
-  width: 0;
-}
-.edge-case {
-  border: "{";
-  width: "{";
-}
-.slash-vs-math {
-  border-radius: 0.4px;
-  border-radius: 0.5px;
-  border-radius: 6px;
-}
-.comma-vs-semi-colon {
-  one: a;
-  two: b, c;
-  one: d, e;
-  two: f;
-  one: g;
-  one: h;
-  one: i;
-  one: j;
-  one: k;
-  two: l;
-  one: m, n;
-  one: o, p;
-  two: q;
-  one: r, s;
-  two: t;
-}
-#named-conflict {
-  four: a, 11, 12, 13;
-  four: a, 21, 22, 23;
-}
-.test-mixin-default-arg {
-  defaults: 1px 1px 1px;
-  defaults: 2px 2px 2px;
-}
-.selector {
-  margin: 2, 2, 2, 2;
-}
-.selector2 {
-  margin: 2, 2, 2, 2;
-}
-.selector3 {
-  margin: 4;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-closure.css b/test/Fixtures/lessjs (1.6)/expected/mixins-closure.css
deleted file mode 100644
index b1021b6f..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-closure.css	
+++ /dev/null
@@ -1,9 +0,0 @@
-.class {
-  width: 99px;
-}
-.overwrite {
-  width: 99px;
-}
-.nested .class {
-  width: 5px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-guards-default-func.css b/test/Fixtures/lessjs (1.6)/expected/mixins-guards-default-func.css
deleted file mode 100644
index e47f05cf..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-guards-default-func.css	
+++ /dev/null
@@ -1,129 +0,0 @@
-guard-default-basic-1-1 {
-  case: 1;
-}
-guard-default-basic-1-2 {
-  default: 2;
-}
-guard-default-basic-2-0 {
-  default: 0;
-}
-guard-default-basic-2-2 {
-  case: 2;
-}
-guard-default-basic-3-0 {
-  default: 0;
-}
-guard-default-basic-3-2 {
-  case: 2;
-}
-guard-default-basic-3-3 {
-  case: 3;
-}
-guard-default-definition-order-0 {
-  default: 0;
-}
-guard-default-definition-order-2 {
-  case: 2;
-}
-guard-default-definition-order-2 {
-  case: 3;
-}
-guard-default-out-of-guard-0 {
-  case-0: default();
-  case-1: 1;
-  default: 2;
-  case-2: default();
-}
-guard-default-out-of-guard-1 {
-  default: default();
-}
-guard-default-out-of-guard-2 {
-  default: default();
-}
-guard-default-expr-not-1 {
-  case: 1;
-  default: 1;
-}
-guard-default-expr-eq-true {
-  case: true;
-}
-guard-default-expr-eq-false {
-  case: false;
-  default: false;
-}
-guard-default-expr-or-1 {
-  case: 1;
-}
-guard-default-expr-or-2 {
-  case: 2;
-  default: 2;
-}
-guard-default-expr-or-3 {
-  default: 3;
-}
-guard-default-expr-and-1 {
-  case: 1;
-}
-guard-default-expr-and-2 {
-  case: 2;
-}
-guard-default-expr-and-3 {
-  default: 3;
-}
-guard-default-expr-always-1 {
-  case: 1;
-  default: 1;
-}
-guard-default-expr-always-2 {
-  default: 2;
-}
-guard-default-expr-never-1 {
-  case: 1;
-}
-guard-default-multi-1-0 {
-  case: 0;
-}
-guard-default-multi-1-1 {
-  default-1: 1;
-}
-guard-default-multi-2-1 {
-  default-1: no;
-}
-guard-default-multi-2-2 {
-  default-2: no;
-}
-guard-default-multi-2-3 {
-  default-3: 3;
-}
-guard-default-multi-3-blue {
-  case-2: #00008b;
-}
-guard-default-multi-3-green {
-  default-color: #008000;
-}
-guard-default-multi-3-foo {
-  case-1: I am 'foo';
-}
-guard-default-multi-3-baz {
-  default-string: I am 'baz';
-}
-guard-default-multi-4 {
-  always: 1;
-  always: 2;
-  case: 2;
-}
-guard-default-not-ambiguos-2 {
-  case: 1;
-  not-default: 2;
-}
-guard-default-not-ambiguos-3 {
-  case: 1;
-  not-default-1: 2;
-  not-default-2: 2;
-}
-guard-default-scopes-3 {
-  3: when default;
-}
-guard-default-scopes-1 {
-  1: no condition;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-guards.css b/test/Fixtures/lessjs (1.6)/expected/mixins-guards.css
deleted file mode 100644
index 25e6f287..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-guards.css	
+++ /dev/null
@@ -1,82 +0,0 @@
-.light1 {
-  color: white;
-  margin: 1px;
-}
-.light2 {
-  color: black;
-  margin: 1px;
-}
-.max1 {
-  width: 6;
-}
-.max2 {
-  width: 8;
-}
-.glob1 {
-  margin: auto auto;
-}
-.ops1 {
-  height: gt-or-eq;
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-}
-.ops2 {
-  height: gt-or-eq;
-  height: not-eq;
-}
-.ops3 {
-  height: lt-or-eq;
-  height: lt-or-eq-alias;
-  height: not-eq;
-}
-.default1 {
-  content: default;
-}
-.test1 {
-  content: "true.";
-}
-.test2 {
-  content: "false.";
-}
-.test3 {
-  content: "false.";
-}
-.test4 {
-  content: "false.";
-}
-.test5 {
-  content: "false.";
-}
-.bool1 {
-  content: true and true;
-  content: true;
-  content: false, true;
-  content: false and true and true, true;
-  content: false, true and true;
-  content: false, false, true;
-  content: false, true and true and true, false;
-  content: not false;
-  content: not false and false, not false;
-}
-.equality-units {
-  test: pass;
-}
-.colorguardtest {
-  content: is #ff0000;
-  content: is not #0000ff its #ff0000;
-  content: is not #0000ff its #800080;
-}
-.stringguardtest {
-  content: is theme1;
-  content: is not theme2;
-  content: is theme1 no quotes;
-}
-#tryNumberPx {
-  catch: all;
-  declare: 4;
-  declare: 4px;
-}
-.call-lock-mixin .call-inner-lock-mixin {
-  a: 1;
-  x: 1;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-important.css b/test/Fixtures/lessjs (1.6)/expected/mixins-important.css
deleted file mode 100644
index b100af7f..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-important.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.class {
-  border: 1;
-  boxer: 1;
-  border-width: 1;
-  border: 2 !important;
-  boxer: 2 !important;
-  border-width: 2 !important;
-  border: 3;
-  boxer: 3;
-  border-width: 3;
-  border: 4 !important;
-  boxer: 4 !important;
-  border-width: 4 !important;
-  border: 5;
-  boxer: 5;
-  border-width: 5;
-  border: 0 !important;
-  boxer: 0 !important;
-  border-width: 0 !important;
-  border: 9 !important;
-  border: 9;
-  boxer: 9;
-  border-width: 9;
-}
-.class .inner {
-  test: 1;
-}
-.class .inner {
-  test: 2 !important;
-}
-.class .inner {
-  test: 3;
-}
-.class .inner {
-  test: 4 !important;
-}
-.class .inner {
-  test: 5;
-}
-.class .inner {
-  test: 0 !important;
-}
-.class .inner {
-  test: 9;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-interpolated.css b/test/Fixtures/lessjs (1.6)/expected/mixins-interpolated.css
deleted file mode 100644
index 637b5b68..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-interpolated.css	
+++ /dev/null
@@ -1,39 +0,0 @@
-.foo {
-  a: 1;
-}
-.foo {
-  a: 2;
-}
-#foo {
-  a: 3;
-}
-#foo {
-  a: 4;
-}
-mi-test-a {
-  a: 1;
-  a: 2;
-  a: 3;
-  a: 4;
-}
-.b .bb.foo-xxx .yyy-foo#foo .foo.bbb {
-  b: 1;
-}
-mi-test-b {
-  b: 1;
-}
-#foo-foo > .bar .baz {
-  c: c;
-}
-mi-test-c-1 > .bar .baz {
-  c: c;
-}
-mi-test-c-2 .baz {
-  c: c;
-}
-mi-test-c-3 {
-  c: c;
-}
-mi-test-d {
-  gender: "Male";
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-named-args.css b/test/Fixtures/lessjs (1.6)/expected/mixins-named-args.css
deleted file mode 100644
index e460aa10..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-named-args.css	
+++ /dev/null
@@ -1,27 +0,0 @@
-.named-arg {
-  color: blue;
-  width: 5px;
-  height: 99%;
-  args: 1px 100%;
-  text-align: center;
-}
-.class {
-  width: 5px;
-  height: 19%;
-  args: 1px 20%;
-}
-.all-args-wrong-args {
-  width: 10px;
-  height: 9%;
-  args: 2px 10%;
-}
-.named-args2 {
-  width: 15px;
-  height: 49%;
-  color: #646464;
-}
-.named-args3 {
-  width: 5px;
-  height: 29%;
-  color: #123456;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-nested.css b/test/Fixtures/lessjs (1.6)/expected/mixins-nested.css
deleted file mode 100644
index 6378c475..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-nested.css	
+++ /dev/null
@@ -1,14 +0,0 @@
-.class .inner {
-  height: 300;
-}
-.class .inner .innest {
-  width: 30;
-  border-width: 60;
-}
-.class2 .inner {
-  height: 600;
-}
-.class2 .inner .innest {
-  width: 60;
-  border-width: 120;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins-pattern.css b/test/Fixtures/lessjs (1.6)/expected/mixins-pattern.css
deleted file mode 100644
index 8b828335..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins-pattern.css	
+++ /dev/null
@@ -1,47 +0,0 @@
-.zero {
-  variadic: true;
-  zero: 0;
-  one: 1;
-  two: 2;
-  three: 3;
-}
-.one {
-  variadic: true;
-  one: 1;
-  one-req: 1;
-  two: 2;
-  three: 3;
-}
-.two {
-  variadic: true;
-  two: 2;
-  three: 3;
-}
-.three {
-  variadic: true;
-  three-req: 3;
-  three: 3;
-}
-.left {
-  left: 1;
-}
-.right {
-  right: 1;
-}
-.border-right {
-  color: black;
-  border-right: 4px;
-}
-.border-left {
-  color: black;
-  border-left: 4px;
-}
-.only-right {
-  right: 33;
-}
-.only-left {
-  left: 33;
-}
-.left-right {
-  both: 330;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/mixins.css b/test/Fixtures/lessjs (1.6)/expected/mixins.css
deleted file mode 100644
index 32097f97..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/mixins.css	
+++ /dev/null
@@ -1,141 +0,0 @@
-.mixin {
-  border: 1px solid black;
-}
-.mixout {
-  border-color: orange;
-}
-.borders {
-  border-style: dashed;
-}
-#namespace .borders {
-  border-style: dotted;
-}
-#namespace .biohazard {
-  content: "death";
-}
-#namespace .biohazard .man {
-  color: transparent;
-}
-#theme > .mixin {
-  background-color: grey;
-}
-#container {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-#header .milk {
-  color: white;
-  border: 1px solid black;
-  background-color: grey;
-}
-#header #cookie {
-  border-style: dashed;
-}
-#header #cookie .chips {
-  border-style: dotted;
-}
-#header #cookie .chips .calories {
-  color: black;
-  border: 1px solid black;
-  border-color: orange;
-  background-color: grey;
-}
-.secure-zone {
-  color: transparent;
-}
-.direct {
-  border-style: dotted;
-}
-.bo,
-.bar {
-  width: 100%;
-}
-.bo {
-  border: 1px;
-}
-.ar.bo.ca {
-  color: black;
-}
-.jo.ki {
-  background: none;
-}
-.amp.support {
-  color: orange;
-}
-.amp.support .higher {
-  top: 0px;
-}
-.amp.support.deeper {
-  height: auto;
-}
-.extended {
-  width: 100%;
-  border: 1px;
-  background: none;
-  color: orange;
-  top: 0px;
-  height: auto;
-}
-.extended .higher {
-  top: 0px;
-}
-.extended.deeper {
-  height: auto;
-}
-.do .re .mi .fa .sol .la .si {
-  color: cyan;
-}
-.mutli-selector-parents {
-  color: cyan;
-}
-.foo .bar {
-  width: 100%;
-}
-.underParents {
-  color: red;
-}
-.parent .underParents {
-  color: red;
-}
-* + h1 {
-  margin-top: 25px;
-}
-legend + h1 {
-  margin-top: 0;
-}
-h1 + * {
-  margin-top: 10px;
-}
-* + h2 {
-  margin-top: 20px;
-}
-legend + h2 {
-  margin-top: 0;
-}
-h2 + * {
-  margin-top: 8px;
-}
-* + h3 {
-  margin-top: 15px;
-}
-legend + h3 {
-  margin-top: 0;
-}
-h3 + * {
-  margin-top: 5px;
-}
-.error {
-  background-image: "/a.png";
-  background-position: center center;
-}
-.test-rec .recursion {
-  color: black;
-}
-.button {
-  padding-left: 44px;
-}
-.button.large {
-  padding-left: 40em;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/no-output.css b/test/Fixtures/lessjs (1.6)/expected/no-output.css
deleted file mode 100644
index 8b137891..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/no-output.css	
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/test/Fixtures/lessjs (1.6)/expected/operations.css b/test/Fixtures/lessjs (1.6)/expected/operations.css
deleted file mode 100644
index fb9e0aff..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/operations.css	
+++ /dev/null
@@ -1,49 +0,0 @@
-#operations {
-  color: #111111;
-  height: 9px;
-  width: 3em;
-  substraction: 0;
-  division: 1;
-}
-#operations .spacing {
-  height: 9px;
-  width: 3em;
-}
-.with-variables {
-  height: 16em;
-  width: 24em;
-  size: 1cm;
-}
-.with-functions {
-  color: #646464;
-  color: #ff8080;
-  color: #c94a4a;
-}
-.negative {
-  height: 0px;
-  width: 4px;
-}
-.shorthands {
-  padding: -1px 2px 0 -4px;
-}
-.rem-dimensions {
-  font-size: 5.5rem;
-}
-.colors {
-  color: #123;
-  border-color: #334455;
-  background-color: #000000;
-}
-.colors .other {
-  color: #222222;
-  border-color: #222222;
-}
-.negations {
-  variable: -4px;
-  variable1: 0px;
-  variable2: 0px;
-  variable3: 8px;
-  variable4: 0px;
-  paren: -4px;
-  paren2: 16px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/parens.css b/test/Fixtures/lessjs (1.6)/expected/parens.css
deleted file mode 100644
index 7321696b..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/parens.css	
+++ /dev/null
@@ -1,36 +0,0 @@
-.parens {
-  border: 2px solid #000000;
-  margin: 1px 3px 16 3;
-  width: 36;
-  padding: 2px 36px;
-}
-.more-parens {
-  padding: 8 4 4 4px;
-  width-all: 96;
-  width-first: 96;
-  width-keep: 96;
-  height-keep: 113;
-  height-all: 113;
-  height-parts: 113;
-  margin-keep: 12;
-  margin-parts: 12;
-  margin-all: 12;
-  border-radius-keep: 5px;
-  border-radius-parts: 1.14285714px;
-  border-radius-all: 5px;
-}
-.negative {
-  neg-var: -1;
-  neg-var-paren: -1;
-}
-.nested-parens {
-  width: 71;
-  height: 6;
-}
-.mixed-units {
-  margin: 2px 4em 1 5pc;
-  padding: 6px 1em 2px 2;
-}
-.test-false-negatives {
-  a: (;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/property-name-interp.css b/test/Fixtures/lessjs (1.6)/expected/property-name-interp.css
deleted file mode 100644
index ccb78557..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/property-name-interp.css	
+++ /dev/null
@@ -1,20 +0,0 @@
-pi-test {
-  border: 0;
-  ufo-width: 50%;
-  *-z-border: 1px dashed blue;
-  -www-border-top: 2px;
-  radius-is-not-a-border: true;
-  border-top-left-radius: 2em;
-  border-top-red-radius-: 3pt;
-  global-local-mixer-property: strong;
-}
-pi-test-merge {
-  pre-property-ish: high, middle, low, base;
-  pre-property-ish+: nice try dude;
-}
-pi-indirect-vars {
-  auto: auto;
-}
-pi-complex-values {
-  3px rgba(255, 255, 0, 0.5), 3.14159265 /* foo */3px rgba(255, 255, 0, 0.5), 3.14159265 /* foo */: none;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/rulesets.css b/test/Fixtures/lessjs (1.6)/expected/rulesets.css
deleted file mode 100644
index 408c76aa..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/rulesets.css	
+++ /dev/null
@@ -1,33 +0,0 @@
-#first > .one {
-  font-size: 2em;
-}
-#first > .one > #second .two > #deux {
-  width: 50%;
-}
-#first > .one > #second .two > #deux #third {
-  height: 100%;
-}
-#first > .one > #second .two > #deux #third:focus {
-  color: black;
-}
-#first > .one > #second .two > #deux #third:focus #fifth > #sixth .seventh #eighth + #ninth {
-  color: purple;
-}
-#first > .one > #second .two > #deux #fourth,
-#first > .one > #second .two > #deux #five,
-#first > .one > #second .two > #deux #six {
-  color: #110000;
-}
-#first > .one > #second .two > #deux #fourth .seven,
-#first > .one > #second .two > #deux #five .seven,
-#first > .one > #second .two > #deux #six .seven,
-#first > .one > #second .two > #deux #fourth .eight > #nine,
-#first > .one > #second .two > #deux #five .eight > #nine,
-#first > .one > #second .two > #deux #six .eight > #nine {
-  border: 1px solid black;
-}
-#first > .one > #second .two > #deux #fourth #ten,
-#first > .one > #second .two > #deux #five #ten,
-#first > .one > #second .two > #deux #six #ten {
-  color: red;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/scope.css b/test/Fixtures/lessjs (1.6)/expected/scope.css
deleted file mode 100644
index baa05523..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/scope.css	
+++ /dev/null
@@ -1,35 +0,0 @@
-.tiny-scope {
-  color: #998899;
-}
-.scope1 {
-  color: #0000ff;
-  border-color: #000000;
-}
-.scope1 .scope2 {
-  color: #0000ff;
-}
-.scope1 .scope2 .scope3 {
-  color: #ff0000;
-  border-color: #000000;
-  background-color: #ffffff;
-}
-.scope {
-  scoped-val: #008000;
-}
-.heightIsSet {
-  height: 1024px;
-}
-.useHeightInMixinCall {
-  mixin-height: 1024px;
-}
-.imported {
-  exists: true;
-}
-.testImported {
-  exists: true;
-}
-#allAreUsedHere {
-  default: 'top level';
-  scope: 'top level';
-  sub-scope-only: 'inside';
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/selectors.css b/test/Fixtures/lessjs (1.6)/expected/selectors.css
deleted file mode 100644
index 11909fe5..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/selectors.css	
+++ /dev/null
@@ -1,153 +0,0 @@
-h1 a:hover,
-h2 a:hover,
-h3 a:hover,
-h1 p:hover,
-h2 p:hover,
-h3 p:hover {
-  color: red;
-}
-#all {
-  color: blue;
-}
-#the {
-  color: blue;
-}
-#same {
-  color: blue;
-}
-ul,
-li,
-div,
-q,
-blockquote,
-textarea {
-  margin: 0;
-}
-td {
-  margin: 0;
-  padding: 0;
-}
-td,
-input {
-  line-height: 1em;
-}
-a {
-  color: red;
-}
-a:hover {
-  color: blue;
-}
-div a {
-  color: green;
-}
-p a span {
-  color: yellow;
-}
-.foo .bar .qux,
-.foo .baz .qux {
-  display: block;
-}
-.qux .foo .bar,
-.qux .foo .baz {
-  display: inline;
-}
-.qux.foo .bar,
-.qux.foo .baz {
-  display: inline-block;
-}
-.qux .foo .bar .biz,
-.qux .foo .baz .biz {
-  display: none;
-}
-.a.b.c {
-  color: red;
-}
-.c .b.a {
-  color: red;
-}
-.foo .p.bar {
-  color: red;
-}
-.foo.p.bar {
-  color: red;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo {
-  background: amber;
-}
-.foo + .foo,
-.foo + .bar,
-.bar + .foo,
-.bar + .bar {
-  background: amber;
-}
-.foo a > .foo a,
-.foo a > .bar a,
-.foo a > .foo b,
-.foo a > .bar b,
-.bar a > .foo a,
-.bar a > .bar a,
-.bar a > .foo b,
-.bar a > .bar b,
-.foo b > .foo a,
-.foo b > .bar a,
-.foo b > .foo b,
-.foo b > .bar b,
-.bar b > .foo a,
-.bar b > .bar a,
-.bar b > .foo b,
-.bar b > .bar b {
-  background: amber;
-}
-.other ::fnord {
-  color: red;
-}
-.other::fnord {
-  color: red;
-}
-.other ::bnord {
-  color: red;
-}
-.other::bnord {
-  color: red;
-}
-.blood {
-  color: red;
-}
-.bloodred {
-  color: green;
-}
-#blood.blood.red.black {
-  color: black;
-}
-:nth-child(3) {
-  selector: interpolated;
-}
-.test:nth-child(odd):not(:nth-child(3)) {
-  color: #ff0000;
-}
-[prop],
-[prop=10%],
-[prop="value3"],
-[prop*="val3"],
-[|prop~="val3"],
-[*|prop$="val3"],
-[ns|prop^="val3"],
-[3^="val3"],
-[3=3],
-[3] {
-  attributes: yes;
-}
-/*
-Large comment means chunk will be emitted after } which means chunk will begin with whitespace...
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-*/
-.blood {
-  color: red;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/strings.css b/test/Fixtures/lessjs (1.6)/expected/strings.css
deleted file mode 100644
index cd6d6020..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/strings.css	
+++ /dev/null
@@ -1,43 +0,0 @@
-#strings {
-  background-image: url("http://son-of-a-banana.com");
-  quotes: "~" "~";
-  content: "#*%:&^,)!.(~*})";
-  empty: "";
-  brackets: "{" "}";
-  escapes: "\"hello\" \\world";
-  escapes2: "\"llo";
-}
-#comments {
-  content: "/* hello */ // not-so-secret";
-}
-#single-quote {
-  quotes: "'" "'";
-  content: '""#!&""';
-  empty: '';
-  semi-colon: ';';
-}
-#escaped {
-  filter: DX.Transform.MS.BS.filter(opacity=50);
-}
-#one-line {
-  image: url(http://tooks.com);
-}
-#crazy {
-  image: url(http://), "}", url("http://}");
-}
-#interpolation {
-  url: "http://lesscss.org/dev/image.jpg";
-  url2: "http://lesscss.org/image-256.jpg";
-  url3: "http://lesscss.org#445566";
-  url4: "http://lesscss.org/hello";
-  url5: "http://lesscss.org/54.4px";
-}
-.mix-mul-class {
-  color: #0000ff;
-  color: #ff0000;
-  color: #000000;
-  color: #ffa500;
-}
-.watermark {
-  family: Univers, Arial, Verdana, San-Serif;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/urls.css b/test/Fixtures/lessjs (1.6)/expected/urls.css
deleted file mode 100644
index af5b0542..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/urls.css	
+++ /dev/null
@@ -1,71 +0,0 @@
-@import "css/background.css";
-@import "import/import-test-d.css";
-@import "file.css";
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium), url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-  background: url("img.jpg") center / 100px;
-  background: #ffffff url(image.png) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700");
-}
-#svg-data-uri {
-  background: rgba(0, 0, 0, 0) url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-  url: url('Trebuchet');
-}
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('import/assets/logo.png');
-}
-@font-face {
-  font-family: xecret;
-  src: url('import/assets/xecret.ttf');
-}
-#secret {
-  font-family: xecret, sans-serif;
-}
-#imported-relative-path {
-  background-image: url(../data/image.jpg);
-  border-image: url('../data/image.jpg');
-}
-#relative-url-import {
-  background-image: url(../data/image.jpg);
-  border-image: url('../data/image.jpg');
-}
-#data-uri {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-guess {
-  uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
-}
-#data-uri-ascii {
-  uri-1: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-  uri-2: url("data:text/html,%3Ch1%3EThis%20page%20is%20100%25%20Awesome.%3C%2Fh1%3E%0A");
-}
-#data-uri-toobig {
-  uri: url('../data/data-uri-fail.png');
-}
-#svg-functions {
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-  background-image: url('data:image/svg+xml;base64,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');
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/variables.css b/test/Fixtures/lessjs (1.6)/expected/variables.css
deleted file mode 100644
index 0eb73974..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/variables.css	
+++ /dev/null
@@ -1,45 +0,0 @@
-.variables {
-  width: 14cm;
-}
-.variables {
-  height: 24px;
-  color: #888888;
-  font-family: "Trebuchet MS", Verdana, sans-serif;
-  quotes: "~" "~";
-}
-.redef {
-  zero: 0;
-}
-.redef .inition {
-  three: 3;
-}
-.values {
-  minus-one: -1;
-  font-family: 'Trebuchet', 'Trebuchet', 'Trebuchet';
-  color: #888888 !important;
-  multi: something 'A', B, C, 'Trebuchet';
-}
-.variable-names {
-  name: 'hello';
-}
-.alpha {
-  filter: alpha(opacity=42);
-}
-.testPollution {
-  a: 'no-pollution';
-}
-.units {
-  width: 1px;
-  same-unit-as-previously: 1px;
-  square-pixel-divided: 1px;
-  odd-unit: 2;
-  percentage: 500%;
-  pixels: 500px;
-  conversion-metric-a: 30mm;
-  conversion-metric-b: 3cm;
-  conversion-imperial: 3.00000055in;
-  custom-unit: 420octocats;
-  custom-unit-cancelling: 18dogs;
-  mix-units: 2px;
-  invalid-units: 1px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/expected/whitespace.css b/test/Fixtures/lessjs (1.6)/expected/whitespace.css
deleted file mode 100644
index bafbd90b..00000000
--- a/test/Fixtures/lessjs (1.6)/expected/whitespace.css	
+++ /dev/null
@@ -1,42 +0,0 @@
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.whitespace {
-  color: white;
-}
-.white,
-.space,
-.mania {
-  color: white;
-}
-.no-semi-column {
-  color: white;
-}
-.no-semi-column {
-  color: white;
-  white-space: pre;
-}
-.no-semi-column {
-  border: 2px solid #ffffff;
-}
-.newlines {
-  background: the,
-              great,
-              wall;
-  border: 2px
-          solid
-          black;
-}
-.sel .newline_ws .tab_ws {
-  color: white;
-  background-position: 45 -23;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/charsets.less b/test/Fixtures/lessjs (1.6)/less/charsets.less
deleted file mode 100644
index 550d40e9..00000000
--- a/test/Fixtures/lessjs (1.6)/less/charsets.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-@charset "UTF-8";
-
-@import "import/import-charset-test";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/colors.less b/test/Fixtures/lessjs (1.6)/less/colors.less
deleted file mode 100644
index 7abda4e5..00000000
--- a/test/Fixtures/lessjs (1.6)/less/colors.less	
+++ /dev/null
@@ -1,98 +0,0 @@
-#yelow {
-  #short {
-    color: #fea;
-  }
-  #long {
-    color: #ffeeaa;
-  }
-  #rgba {
-    color: rgba(255, 238, 170, 0.1);
-  }
-  #argb {
-    color: argb(rgba(255, 238, 170, 0.1));
-  }
-}
-
-#blue {
-  #short {
-    color: #00f;
-  }
-  #long {
-    color: #0000ff;
-  }
-  #rgba {
-    color: rgba(0, 0, 255, 0.1);
-  }
-  #argb {
-    color: argb(rgba(0, 0, 255, 0.1));
-  }
-}
-
-#alpha #hsla {
-    color: hsla(11, 20%, 20%, 0.6);
-}
-
-#overflow {
-  .a { color: (#111111 - #444444); } // #000000
-  .b { color: (#eee + #fff); } // #ffffff
-  .c { color: (#aaa * 3); } // #ffffff
-  .d { color: (#00ee00 + #009900); } // #00ff00
-  .e { color: rgba(-99.9, 31.4159, 321, 0.42); }  
-}
-
-#grey {
-  color: rgb(200, 200, 200);
-}
-
-#333333 {
-  color: rgb(20%, 20%, 20%);
-}
-
-#808080 {
-  color: hsl(50, 0%, 50%);
-}
-
-#00ff00 {
-  color: hsl(120, 100%, 50%);
-}
-
-.lightenblue {
-    color: lighten(blue, 10%);
-}
-
-.darkenblue {
-    color: darken(blue, 10%);
-}
-
-.unknowncolors {
-    color: blue2;
-    border: 2px solid superred;
-}
-
-.transparent {
-    color: transparent;
-    background-color: rgba(0, 0, 0, 0);
-}
-#alpha {
-    @colorvar: rgba(150, 200, 150, 0.7);
-    #fromvar {
-        opacity: alpha(@colorvar);
-    }
-    #short {
-        opacity: alpha(#aaa);
-    }
-    #long {
-        opacity: alpha(#bababa);
-    }
-    #rgba {
-        opacity: alpha(rgba(50, 120, 95, 0.2));
-    }
-    #hsl {
-        opacity: alpha(hsl(120, 100%, 50%));
-    }
-}
-
-#percentage {
-  color: red(rgb(100%, 0, 0));
-  border-color: rgba(100%, 0, 0, 50%);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/comments.less b/test/Fixtures/lessjs (1.6)/less/comments.less
deleted file mode 100644
index 7859911e..00000000
--- a/test/Fixtures/lessjs (1.6)/less/comments.less	
+++ /dev/null
@@ -1,83 +0,0 @@
-/******************\
-*                  *
-*  Comment Header  *
-*                  *
-\******************/
-
-/*
-
-    Comment
-
-*/
-
-/*
- * Comment Test
- *
- * - cloudhead (http://cloudhead.net)
- *
- */
-
-////////////////
-@var: "content";
-////////////////
-
-/* Colors
- * ------
- *   #EDF8FC (background blue)
- *   #166C89 (darkest blue)
- *
- * Text:
- *   #333 (standard text) // A comment within a comment!
- *   #1F9EC9 (standard link)
- *
- */
-
-/* @group Variables
-------------------- */
-#comments /* boo *//* boo again*/,
-//.commented_out1
-//.commented_out2
-//.commented_out3
-.comments //end of comments1
-//end of comments2
-{
-  /**/ // An empty comment
-  color: red; /* A C-style comment */  /* A C-style comment */
-  background-color: orange; // A little comment
-  font-size: 12px;
-
-  /* lost comment */ content: @var;
-
-  border: 1px solid black;
-
-  // padding & margin //
-  padding: 0; // }{ '"
-  margin: 2em;
-} //
-
-/* commented out
-  #more-comments {
-    color: grey;
-  }
-*/
-
-.selector /* .with */, .lots, /* of */ .comments {
-  color: grey, /* blue */ orange;
-  -webkit-border-radius: 2px /* webkit only */;
-  -moz-border-radius: (2px * 4) /* moz only with operation */;
-}
-
-.mixin_def_with_colors(@a: white, // in
-       @b: 1px //put in @b - causes problems! --->
-	   ) // the
-	   when (@a = white) {
-	.test {
-	    color: @b;
-	}
-}
-.mixin_def_with_colors();
-
-#last { color: blue }
-//
-
-/*  *//* { *//*  *//*  *//*  */#div { color:#A33; }/* } */
diff --git a/test/Fixtures/lessjs (1.6)/less/compression/compression.less b/test/Fixtures/lessjs (1.6)/less/compression/compression.less
deleted file mode 100644
index c196336a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/compression/compression.less	
+++ /dev/null
@@ -1,36 +0,0 @@
-#colours {
-  color1: #fea;
-  color2: #ffeeaa;
-  color3: rgba(255, 238, 170, 0.1);
-  @color1: #fea;
-  string: "@{color1}";
-  /* comments are stripped */
-  // both types!
-  /*! but not this type
-      Note preserved whitespace
-  */
-}
-dimensions {
-  val: 0.1px;
-  val: 0em;
-  val: 4cm;
-  val: 0.2;
-  val: 5;
-  angles-must-have-unit: 0deg;
-  durations-must-have-unit: 0s;
-  length-doesnt-have-unit: 0px;
-  width: auto\9;
-}
-@page  {
-  marks: none;
-@top-left-corner {
-  vertical-align: top;
-}
-@top-left {
-  vertical-align: top;
-}
-}
-.shadow ^ .dom,
-body ^^ .shadow {
-  display: done;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/css-3.less b/test/Fixtures/lessjs (1.6)/less/css-3.less
deleted file mode 100644
index 06a5d2c5..00000000
--- a/test/Fixtures/lessjs (1.6)/less/css-3.less	
+++ /dev/null
@@ -1,129 +0,0 @@
-.comma-delimited {
-  text-shadow: -1px -1px 1px red, 6px 5px 5px yellow;
-  -moz-box-shadow: 0pt 0pt 2px rgba(255, 255, 255, 0.4) inset,
-    0pt 4px 6px rgba(255, 255, 255, 0.4) inset;
-  -webkit-transform: rotate(-0.0000000001deg);
-}
-@font-face {
-  font-family: Headline;
-  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
-}
-.other {
-  -moz-transform: translate(0, 11em) rotate(-90deg);
-  transform: rotateX(45deg);
-}
-.item[data-cra_zy-attr1b-ut3=bold] {
-  font-weight: bold;
-}
-p:not([class*="lead"]) {
-  color: black;
-}
-
-input[type="text"].class#id[attr=32]:not(1) {
-  color: white;
-}
-
-div#id.class[a=1][b=2].class:not(1) {
-  color: white;
-}
-
-ul.comma > li:not(:only-child)::after {
-  color: white;
-}
-
-ol.comma > li:nth-last-child(2)::after {
-  color: white;
-}
-
-li:nth-child(4n+1),
-li:nth-child(-5n),
-li:nth-child(-n+2) {
-  color: white;
-}
-
-a[href^="http://"] {
-  color: black;
-}
-
-a[href$="http://"] {
-  color: black;
-}
-
-form[data-disabled] {
-  color: black;
-}
-
-p::before {
-  color: black;
-}
-
-#issue322 {
-  -webkit-animation: anim2 7s infinite ease-in-out;
-}
-
-@-webkit-keyframes frames {
-  0% { border: 1px }
-  5.5% { border: 2px }
-  100% { border: 3px }
-}
-
-@keyframes fontbulger1 {
-  to {
-    font-size: 15px;
-  }
-  from,to {
-    font-size: 12px;
-  }
-  0%,100% {
-    font-size: 12px;
-  }
-}
-
-.units {
-  font: 1.2rem/2rem;
-  font: 8vw/9vw;
-  font: 10vh/12vh;
-  font: 12vm/15vm;
-  font: 12vmin/15vmin;
-  font: 1.2ch/1.5ch;
-}
-
-@supports ( box-shadow: 2px 2px 2px black ) or
-          ( -moz-box-shadow: 2px 2px 2px black ) {
-  .outline {
-    box-shadow: 2px 2px 2px black;
-    -moz-box-shadow: 2px 2px 2px black;
-  }
-}
-
-@-x-document url-prefix(""github.com"") {
-  h1 {
-    color: red;
-  }
-}
-
-@viewport {
-  font-size: 10px;
-}
-@namespace foo url(http://www.example.com);
-
-foo|h1 { color: blue; }
-foo|* { color: yellow; }
-|h1 { color: red; }
-*|h1 { color: green; }
-h1 { color: green; }
-.upper-test {
-  UpperCaseProperties: allowed;
-}
-@host {
-  div {
-    display: block;
-  }
-}
-::distributed(input::placeholder) {
-  color: #b3b3b3;
-}
-.shadow ^ .dom,
-body ^^ .shadow {
-  display: done;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/css-escapes.less b/test/Fixtures/lessjs (1.6)/less/css-escapes.less
deleted file mode 100644
index 6a4b2830..00000000
--- a/test/Fixtures/lessjs (1.6)/less/css-escapes.less	
+++ /dev/null
@@ -1,33 +0,0 @@
-@ugly: fuchsia;
-
-.escape\|random\|char {
-	color: red;
-}
-
-.mixin\!tUp {
-	font-weight: bold;
-}
-
-// class="404"
-.\34 04 {
-	background: red;
-	
-	strong {
-		color: @ugly;
-		.mixin\!tUp;
-	}
-}
-
-.trailingTest\+ {
-	color: red;
-}
-
-/* This hideous test of hideousness checks for the selector "blockquote" with various permutations of hex escapes */
-\62\6c\6f \63 \6B \0071 \000075o\74 e {
-	color: silver;
-}
-
-[ng\:cloak],
-ng\:form {
-  display: none;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/css-guards.less b/test/Fixtures/lessjs (1.6)/less/css-guards.less
deleted file mode 100644
index 6dd1cd68..00000000
--- a/test/Fixtures/lessjs (1.6)/less/css-guards.less	
+++ /dev/null
@@ -1,99 +0,0 @@
-
-.light when (lightness(@a) > 50%) {
-  color: green;
-}
-.dark when (lightness(@a) < 50%) {
-  color: orange;
-}
-@a: #ddd;
-
-.see-the {
-  @a: #444; // this mirrors what mixins do - they evaluate the guards at the point of definition
-  .light();
-  .dark();
-}
-
-.hide-the {
-  .light();
-  .dark();
-}
-
-.multiple-conditions-1 when (@b = 1), (@c = 2), (@d = 3) {
-  color: red;
-}
-
-.multiple-conditions-2 when (@b = 1), (@c = 2), (@d = 2) {
-  color: blue;
-}
-
-@b: 2;
-@c: 3;
-@d: 3;
-
-.inheritance when (@b = 2) {
-  .test {
-    color: black;
-  }
-  &:hover {
-    color: pink;
-  }
-  .hideme when (@b = 1) {
-    color: green;
-  }
-  & when (@b = 1) {
-    hideme: green;
-  }
-}
-
-.hideme when (@b = 1) {
-  .test {
-    color: black;
-  }
-  &:hover {
-    color: pink;
-  }
-  .hideme when (@b = 1) {
-    color: green;
-  }
-}
-
-& when (@b = 1) {
-  .hideme {
-    color: red;
-  }
-}
-
-.mixin-with-guard-inside(@colWidth) {
-  // selector with guard (applies also to & when() ...)
-  .clsWithGuard when (@colWidth <= 0) {
-    dispaly: none;
-  }
-}
-
-.mixin-with-guard-inside(0px);
-
-.dont-split-me-up {
-  width: 1px;
-  & when (@c = 3) {
-    color: red;
-  }
-  & when (@c = 3) {
-    height: 1px;
-  }
-  + & when (@c = 3) { // creates invalid css but tests that we don't fold it in
-    sibling: true;
-  }
-}
-
-.scope-check when (@c = 3) {
-  @k: 1px;
-  & when (@c = 3) {
-    @k: 2px;
-    sub-prop: @k;
-  }
-  prop: @k;
-}
-.scope-check-2 {
-  .scope-check();
-  @k:4px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/css.less b/test/Fixtures/lessjs (1.6)/less/css.less
deleted file mode 100644
index 766bdd4d..00000000
--- a/test/Fixtures/lessjs (1.6)/less/css.less	
+++ /dev/null
@@ -1,108 +0,0 @@
-@charset "utf-8";
-div { color: black; }
-div { width: 99%; }
-
-* {
-  min-width: 45em;
-}
-
-h1, h2 > a > p, h3 {
-  color: none;
-}
-
-div.class {
-  color: blue;
-}
-
-div#id {
-  color: green;
-}
-
-.class#id {
-  color: purple;
-}
-
-.one.two.three {
-  color: grey;
-}
-
-@media print {
-  * {
-    font-size: 3em;
-  }
-}
-
-@media screen {
-  * {
-    font-size: 10px;
-  }
-}
-
-@font-face {
-  font-family: 'Garamond Pro';
-}
-
-a:hover, a:link {
-  color: #999;
-}
-
-p, p:first-child {
-  text-transform: none;
-}
-
-q:lang(no) {
-  quotes: none;
-}
-
-p + h1 {
-  font-size: +2.2em;
-}
-
-#shorthands {
-  border: 1px solid #000;
-  font: 12px/16px Arial;
-  font: 100%/16px Arial;
-  margin: 1px 0;
-  padding: 0 auto;
-}
-
-#more-shorthands {
-  margin: 0;
-  padding: 1px 0 2px 0;
-  font: normal small/20px 'Trebuchet MS', Verdana, sans-serif;
-  font: 0/0 a;
-  border-radius: 5px / 10px;
-}
-
-.misc {
-  -moz-border-radius: 2px;
-  display: -moz-inline-stack;
-  width: .1em;
-  background-color: #009998;
-  background: -webkit-gradient(linear, left top, left bottom, from(red), to(blue));
-  margin: ;
-  .nested-multiple {
-	multiple-semi-colons: yes;;;;;;
-  };
-  filter: alpha(opacity=100);
-  width: auto\9;
-}
-
-#important {
-  color: red !important;
-  width: 100%!important;
-  height: 20px ! important;
-}
-
-.def-font(@name) {
-    @font-face {
-        font-family: @name
-    }
-}
-
-.def-font(font-a);
-.def-font(font-b);
-
-.æøå {
-  margin: 0;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/debug/import/test.less b/test/Fixtures/lessjs (1.6)/less/debug/import/test.less
deleted file mode 100644
index 795082f5..00000000
--- a/test/Fixtures/lessjs (1.6)/less/debug/import/test.less	
+++ /dev/null
@@ -1,25 +0,0 @@
-@charset "ISO-8859-1";
-
-.mixin_import1() {
-    @media all {
-        .tst {
-            color: black;
-            @media screen {
-                color: red;
-                .tst3 {
-                    color: white;
-                }
-            }
-        }
-    }
-}
-
-.mixin_import2() {
-    .tst2 {
-        color: white;
-    }
-}
-
-.tst3 {
-    color: grey;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/debug/linenumbers.less b/test/Fixtures/lessjs (1.6)/less/debug/linenumbers.less
deleted file mode 100644
index 3bcaed01..00000000
--- a/test/Fixtures/lessjs (1.6)/less/debug/linenumbers.less	
+++ /dev/null
@@ -1,33 +0,0 @@
-@charset "UTF-8";
-
-@import "import/test.less";
-
-.start() {
-  .test2 {
-      color: red;
-  }
-}
-
-.mix() {
-    color: black;
-}
-
-.test1 {
-  .mix();
-}
-
-.start();
-
-.mixin_import1();
-
-.mixin_import2();
-
-@debug: 1;
-& when (@debug = 1) {
-  .test {
-    color: red;
-    & when (@debug = 1) {
-      width: 2;
-    }
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/empty.less b/test/Fixtures/lessjs (1.6)/less/empty.less
deleted file mode 100644
index e69de29b..00000000
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units.less b/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units.less
deleted file mode 100644
index 9b708de9..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  error: (1px + 3em);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units.txt b/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units.txt
deleted file mode 100644
index 9ea45438..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Incompatible units. Change the units or use the unit function. Bad units: 'px' and 'em'. in {path}add-mixed-units.less on line 2, column 3:
-1 .a {
-2   error: (1px + 3em);
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units2.less b/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units2.less
deleted file mode 100644
index 26631160..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units2.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  error: ((1px * 2px) + (3em * 3px));
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units2.txt b/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units2.txt
deleted file mode 100644
index ca34304f..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/add-mixed-units2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Incompatible units. Change the units or use the unit function. Bad units: 'px*px' and 'em*px'. in {path}add-mixed-units2.less on line 2, column 3:
-1 .a {
-2   error: ((1px * 2px) + (3em * 3px));
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/bad-variable-declaration1.less b/test/Fixtures/lessjs (1.6)/less/errors/bad-variable-declaration1.less
deleted file mode 100644
index c2dc6ac0..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/bad-variable-declaration1.less	
+++ /dev/null
@@ -1 +0,0 @@
-@@demo: "hi";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/bad-variable-declaration1.txt b/test/Fixtures/lessjs (1.6)/less/errors/bad-variable-declaration1.txt
deleted file mode 100644
index 5ae9d4a4..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/bad-variable-declaration1.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: Unrecognised input in {path}bad-variable-declaration1.less on line 1, column 1:
-1 @@demo: "hi";
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/color-func-invalid-color.less b/test/Fixtures/lessjs (1.6)/less/errors/color-func-invalid-color.less
deleted file mode 100644
index 5a1edd01..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/color-func-invalid-color.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.test {
-  color: color("NOT A COLOR");
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/color-func-invalid-color.txt b/test/Fixtures/lessjs (1.6)/less/errors/color-func-invalid-color.txt
deleted file mode 100644
index 08990c30..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/color-func-invalid-color.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `color`: argument must be a color keyword or 3/6 digit hex e.g. #FFF in {path}color-func-invalid-color.less on line 2, column 10:
-1 .test {
-2   color: color("NOT A COLOR");
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/comment-in-selector.less b/test/Fixtures/lessjs (1.6)/less/errors/comment-in-selector.less
deleted file mode 100644
index a7d26396..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/comment-in-selector.less	
+++ /dev/null
@@ -1 +0,0 @@
-#gaga /* Comment */ span { color: red }
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/comment-in-selector.txt b/test/Fixtures/lessjs (1.6)/less/errors/comment-in-selector.txt
deleted file mode 100644
index e48f878c..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/comment-in-selector.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: Unrecognised input in {path}comment-in-selector.less on line 1, column 21:
-1 #gaga /* Comment */ span { color: red }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/css-guard-default-func.less b/test/Fixtures/lessjs (1.6)/less/errors/css-guard-default-func.less
deleted file mode 100644
index db6639e1..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/css-guard-default-func.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-
-selector when (default()) {
-    color: red;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/css-guard-default-func.txt b/test/Fixtures/lessjs (1.6)/less/errors/css-guard-default-func.txt
deleted file mode 100644
index ea670295..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/css-guard-default-func.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: error evaluating function `default`: it is currently only allowed in parametric mixin guards, in {path}css-guard-default-func.less on line 2, column 16:
-1 
-2 selector when (default()) {
-3     color: red;
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/divide-mixed-units.less b/test/Fixtures/lessjs (1.6)/less/errors/divide-mixed-units.less
deleted file mode 100644
index d228b7c4..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/divide-mixed-units.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  error: (1px / 3em);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/divide-mixed-units.txt b/test/Fixtures/lessjs (1.6)/less/errors/divide-mixed-units.txt
deleted file mode 100644
index c189d2aa..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/divide-mixed-units.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Multiple units in dimension. Correct the units or use the unit function. Bad unit: px/em in {path}divide-mixed-units.less on line 2, column 3:
-1 .a {
-2   error: (1px / 3em);
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/extend-no-selector.less b/test/Fixtures/lessjs (1.6)/less/errors/extend-no-selector.less
deleted file mode 100644
index 84689ef3..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/extend-no-selector.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-:extend(.a all) {
-  property: red;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/extend-no-selector.txt b/test/Fixtures/lessjs (1.6)/less/errors/extend-no-selector.txt
deleted file mode 100644
index bd2e3cd7..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/extend-no-selector.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-SyntaxError: Extend must be used to extend a selector, it cannot be used on its own in {path}extend-no-selector.less on line 1, column 17:
-1 :extend(.a all) {
-2   property: red;
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/extend-not-at-end.less b/test/Fixtures/lessjs (1.6)/less/errors/extend-not-at-end.less
deleted file mode 100644
index 90ee512c..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/extend-not-at-end.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a:extend(.b all).c {
-  property: red;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/extend-not-at-end.txt b/test/Fixtures/lessjs (1.6)/less/errors/extend-not-at-end.txt
deleted file mode 100644
index 32ebedfc..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/extend-not-at-end.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-SyntaxError: Extend can only be used at the end of selector in {path}extend-not-at-end.less on line 1, column 21:
-1 .a:extend(.b all).c {
-2   property: red;
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-missing.less b/test/Fixtures/lessjs (1.6)/less/errors/import-missing.less
deleted file mode 100644
index 5ce8e4d9..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-missing.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-.a {
-    color: green;
-	// tests line number for import reference is correct
-}
-
-@import "file-does-not-exist.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-missing.txt b/test/Fixtures/lessjs (1.6)/less/errors/import-missing.txt
deleted file mode 100644
index 488d154a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-missing.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-FileError: '{pathhref}file-does-not-exist.less' wasn't found{404status} in {path}import-missing.less on line 6, column 1:
-5 
-6 @import "file-does-not-exist.less";
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-no-semi.less b/test/Fixtures/lessjs (1.6)/less/errors/import-no-semi.less
deleted file mode 100644
index bf2c7f65..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-no-semi.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "this-statement-is-invalid.less"
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-no-semi.txt b/test/Fixtures/lessjs (1.6)/less/errors/import-no-semi.txt
deleted file mode 100644
index 8b3f795c..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-no-semi.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-ParseError: Unrecognised input in {path}import-no-semi.less on line 1, column 1:
-1 @import "this-statement-is-invalid.less"
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder1.less b/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder1.less
deleted file mode 100644
index 4280673b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder1.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "imports/import-subfolder1.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder1.txt b/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder1.txt
deleted file mode 100644
index 97629276..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder1.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-NameError: .mixin-not-defined is undefined in {path}mixin-not-defined.less on line 11, column 1:
-10 
-11 .mixin-not-defined();
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder2.less b/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder2.less
deleted file mode 100644
index a6b9b9ce..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder2.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "imports/import-subfolder2.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder2.txt b/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder2.txt
deleted file mode 100644
index b5b1a69b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/import-subfolder2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ParseError: missing opening `{` in {path}parse-error-curly-bracket.less on line 4, column 1:
-3   }
-4 }
-5 
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/imports/import-subfolder1.less b/test/Fixtures/lessjs (1.6)/less/errors/imports/import-subfolder1.less
deleted file mode 100644
index 24ec0532..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/imports/import-subfolder1.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "subfolder/mixin-not-defined.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/imports/import-subfolder2.less b/test/Fixtures/lessjs (1.6)/less/errors/imports/import-subfolder2.less
deleted file mode 100644
index 6058ad14..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/imports/import-subfolder2.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "subfolder/parse-error-curly-bracket.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/imports/import-test.less b/test/Fixtures/lessjs (1.6)/less/errors/imports/import-test.less
deleted file mode 100644
index a91ae054..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/imports/import-test.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-.someclass
-{
-    font-weight: bold;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/imports/subfolder/mixin-not-defined.less b/test/Fixtures/lessjs (1.6)/less/errors/imports/subfolder/mixin-not-defined.less
deleted file mode 100644
index 2bb2d091..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/imports/subfolder/mixin-not-defined.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "../../mixin-not-defined.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/imports/subfolder/parse-error-curly-bracket.less b/test/Fixtures/lessjs (1.6)/less/errors/imports/subfolder/parse-error-curly-bracket.less
deleted file mode 100644
index f37fa9d0..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/imports/subfolder/parse-error-curly-bracket.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "../../parse-error-curly-bracket.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/javascript-error.less b/test/Fixtures/lessjs (1.6)/less/errors/javascript-error.less
deleted file mode 100644
index 9cffb9ff..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/javascript-error.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.scope {
-    var: `this.foo.toJS()`;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/javascript-error.txt b/test/Fixtures/lessjs (1.6)/less/errors/javascript-error.txt
deleted file mode 100644
index 3c83a966..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/javascript-error.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: JavaScript evaluation error: 'TypeError: Cannot call method 'toJS' of undefined' in {path}javascript-error.less on line 2, column 27:
-1 .scope {
-2     var: `this.foo.toJS()`;
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/javascript-undefined-var.less b/test/Fixtures/lessjs (1.6)/less/errors/javascript-undefined-var.less
deleted file mode 100644
index 7cd580c4..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/javascript-undefined-var.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.scope {
-    @a: `@{b}`;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/javascript-undefined-var.txt b/test/Fixtures/lessjs (1.6)/less/errors/javascript-undefined-var.txt
deleted file mode 100644
index b363aff9..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/javascript-undefined-var.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-NameError: variable @b is undefined in {path}javascript-undefined-var.less on line 2, column 15:
-1 .scope {
-2     @a: `@{b}`;
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-1.less b/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-1.less
deleted file mode 100644
index 9b0e23af..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-1.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-.mixin(@a : 4, @b : 3, @c: 2) {
-    will: fail;
-}
-.mixin-test {
-    .mixin(@a: 5; @b: 6, @c: 7);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-1.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-1.txt
deleted file mode 100644
index a07f5e9d..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-1.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Cannot mix ; and , as delimiter types in {path}mixed-mixin-definition-args-1.less on line 5, column 30:
-4 .mixin-test {
-5     .mixin(@a: 5; @b: 6, @c: 7);
-6 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-2.less b/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-2.less
deleted file mode 100644
index c9709427..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-2.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-.mixin(@a : 4, @b : 3, @c: 2) {
-    will: fail;
-}
-.mixin-test {
-    .mixin(@a: 5, @b: 6; @c: 7);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-2.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-2.txt
deleted file mode 100644
index fa00183b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixed-mixin-definition-args-2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Cannot mix ; and , as delimiter types in {path}mixed-mixin-definition-args-2.less on line 5, column 26:
-4 .mixin-test {
-5     .mixin(@a: 5, @b: 6; @c: 7);
-6 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-defined.less b/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-defined.less
deleted file mode 100644
index e2dad5ce..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-defined.less	
+++ /dev/null
@@ -1,11 +0,0 @@
-
-.error-is-further-on() {
-}
-
-.pad-here-to-reproduce-error-in() {
-}
-
-.the-import-subfolder-test() {
-}
-
-.mixin-not-defined();
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-defined.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-defined.txt
deleted file mode 100644
index 97629276..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-defined.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-NameError: .mixin-not-defined is undefined in {path}mixin-not-defined.less on line 11, column 1:
-10 
-11 .mixin-not-defined();
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched.less b/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched.less
deleted file mode 100644
index be0d6b1a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@saxofon:trumpete;
-
-.mixin(saxofon) {
-}
-
-.mixin(@saxofon);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched.txt
deleted file mode 100644
index 57df9772..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-RuntimeError: No matching definition was found for `.mixin(trumpete)` in {path}mixin-not-matched.less on line 6, column 1:
-5 
-6 .mixin(@saxofon);
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched2.less b/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched2.less
deleted file mode 100644
index 14f44bf3..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched2.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@saxofon:trumpete;
-
-.mixin(@a, @b) {
-}
-
-.mixin(@a: @saxofon);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched2.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched2.txt
deleted file mode 100644
index dceedaf0..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixin-not-matched2.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-RuntimeError: No matching definition was found for `.mixin(@a:trumpete)` in {path}mixin-not-matched2.less on line 6, column 1:
-5 
-6 .mixin(@a: @saxofon);
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-1.less b/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-1.less
deleted file mode 100644
index dc90b86b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-1.less	
+++ /dev/null
@@ -1,9 +0,0 @@
-
-guard-default-func-conflict {
-    .m(@x, 1)                  {}
-    .m(@x, 2) when (default()) {}
-    .m(@x, 2) when (default()) {}
-
-    .m(1, 1);
-    .m(1, 2);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-1.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-1.txt
deleted file mode 100644
index d123c21c..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-1.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-RuntimeError: Ambiguous use of `default()` found when matching for `.m(1, 2)` in {path}mixins-guards-default-func-1.less on line 8, column 5:
-7     .m(1, 1);
-8     .m(1, 2);
-9 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-2.less b/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-2.less
deleted file mode 100644
index 079b5737..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-2.less	
+++ /dev/null
@@ -1,9 +0,0 @@
-
-guard-default-func-conflict {
-    .m(1)                                {}
-    .m(@x) when not(default())           {}
-    .m(@x) when (@x = 3) and (default()) {}
-
-    .m(2);
-    .m(3);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-2.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-2.txt
deleted file mode 100644
index 7f7d7cce..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-RuntimeError: Ambiguous use of `default()` found when matching for `.m(3)` in {path}mixins-guards-default-func-2.less on line 8, column 5:
-7     .m(2);
-8     .m(3);
-9 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-3.less b/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-3.less
deleted file mode 100644
index ec357fa1..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-3.less	
+++ /dev/null
@@ -1,9 +0,0 @@
-
-guard-default-func-conflict {
-    .m(1)                      {}
-    .m(@x) when not(default()) {}
-    .m(@x) when not(default()) {}
-
-    .m(1);
-    .m(2);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-3.txt b/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-3.txt
deleted file mode 100644
index 2a2728cc..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/mixins-guards-default-func-3.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-RuntimeError: Ambiguous use of `default()` found when matching for `.m(2)` in {path}mixins-guards-default-func-3.less on line 8, column 5:
-7     .m(1);
-8     .m(2);
-9 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors.less b/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors.less
deleted file mode 100644
index 4eabb60a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-@ie8: true;
-.a when (@ie8 = true),
-.b {
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors.txt b/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors.txt
deleted file mode 100644
index 3d23e26b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Guards are only currently allowed on a single selector. in {path}multiple-guards-on-css-selectors.less on line 3, column 1:
-2 .a when (@ie8 = true),
-3 .b {
-4 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors2.less b/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors2.less
deleted file mode 100644
index 4b1bc6ff..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors2.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-@ie8: true;
-.a,
-.b when (@ie8 = true) {
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors2.txt b/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors2.txt
deleted file mode 100644
index d0e5a52b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/multiple-guards-on-css-selectors2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Guards are only currently allowed on a single selector. in {path}multiple-guards-on-css-selectors2.less on line 3, column 23:
-2 .a,
-3 .b when (@ie8 = true) {
-4 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/multiply-mixed-units.less b/test/Fixtures/lessjs (1.6)/less/errors/multiply-mixed-units.less
deleted file mode 100644
index ff983a85..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/multiply-mixed-units.less	
+++ /dev/null
@@ -1,7 +0,0 @@
-/* Test */
-#blah {
-  // blah
-}
-.a {
-  error: (1px * 1em);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/multiply-mixed-units.txt b/test/Fixtures/lessjs (1.6)/less/errors/multiply-mixed-units.txt
deleted file mode 100644
index 9ed834f1..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/multiply-mixed-units.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: Multiple units in dimension. Correct the units or use the unit function. Bad unit: em*px in {path}multiply-mixed-units.less on line 6, column 3:
-5 .a {
-6   error: (1px * 1em);
-7 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-1.less b/test/Fixtures/lessjs (1.6)/less/errors/parens-error-1.less
deleted file mode 100644
index 7c8ec10e..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-1.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  something: (12 (13 + 5 -23) + 5);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-1.txt b/test/Fixtures/lessjs (1.6)/less/errors/parens-error-1.txt
deleted file mode 100644
index 6fc40ac0..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-1.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: expected ')' got '(' in {path}parens-error-1.less on line 2, column 18:
-1 .a {
-2   something: (12 (13 + 5 -23) + 5);
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-2.less b/test/Fixtures/lessjs (1.6)/less/errors/parens-error-2.less
deleted file mode 100644
index 4a392b8e..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-2.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  something: (12 * (13 + 5 -23));
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-2.txt b/test/Fixtures/lessjs (1.6)/less/errors/parens-error-2.txt
deleted file mode 100644
index cee5c52d..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: expected ')' got '-' in {path}parens-error-2.less on line 2, column 28:
-1 .a {
-2   something: (12 * (13 + 5 -23));
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-3.less b/test/Fixtures/lessjs (1.6)/less/errors/parens-error-3.less
deleted file mode 100644
index 9e6d5405..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-3.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  something: (12 + (13 + 10 -23));
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-3.txt b/test/Fixtures/lessjs (1.6)/less/errors/parens-error-3.txt
deleted file mode 100644
index 3280ef04..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parens-error-3.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: expected ')' got '-' in {path}parens-error-3.less on line 2, column 29:
-1 .a {
-2   something: (12 + (13 + 10 -23));
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-curly-bracket.less b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-curly-bracket.less
deleted file mode 100644
index f78ceb70..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-curly-bracket.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-body {
-    background-color: #fff;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-curly-bracket.txt b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-curly-bracket.txt
deleted file mode 100644
index b5b1a69b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-curly-bracket.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ParseError: missing opening `{` in {path}parse-error-curly-bracket.less on line 4, column 1:
-3   }
-4 }
-5 
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-extra-parens.less b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-extra-parens.less
deleted file mode 100644
index 46d023a9..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-extra-parens.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-@media (extra: bracket)) {
-  body {
-    background-color: #fff;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-extra-parens.txt b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-extra-parens.txt
deleted file mode 100644
index 5c1aaef2..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-extra-parens.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-ParseError: missing opening `(` in {path}parse-error-extra-parens.less on line 1, column 24:
-1 @media (extra: bracket)) {
-2   body {
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-bracket.less b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-bracket.less
deleted file mode 100644
index 144a6edf..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-bracket.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-body {
-  background-color: #fff;
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-bracket.txt b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-bracket.txt
deleted file mode 100644
index 7db2716e..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-bracket.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-ParseError: missing closing `}` in {path}parse-error-missing-bracket.less on line 1, column 6:
-1 body {
-2   background-color: #fff;
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-parens.less b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-parens.less
deleted file mode 100644
index 55d25791..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-parens.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-@media (missing: bracket {
-  body {
-    background-color: #fff;
-  }
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-parens.txt b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-parens.txt
deleted file mode 100644
index a7a67067..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-missing-parens.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-ParseError: missing closing `)` in {path}parse-error-missing-parens.less on line 1, column 8:
-1 @media (missing: bracket {
-2   body {
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-with-import.less b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-with-import.less
deleted file mode 100644
index 6be3de85..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-with-import.less	
+++ /dev/null
@@ -1,13 +0,0 @@
-@import 'import/import-test.less';
-
-body
-{
-    font-family: arial, sans-serif;
-}
-
-nonsense;
-
-.clickable
-{
-    cursor: pointer;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-with-import.txt b/test/Fixtures/lessjs (1.6)/less/errors/parse-error-with-import.txt
deleted file mode 100644
index 07732c92..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/parse-error-with-import.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ParseError: Unrecognised input in {path}parse-error-with-import.less on line 8, column 9:
-7 
-8 nonsense;
-9 
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-asterisk-only-name.less b/test/Fixtures/lessjs (1.6)/less/errors/property-asterisk-only-name.less
deleted file mode 100644
index c6a9990c..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-asterisk-only-name.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-a {
-    * : 1;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-asterisk-only-name.txt b/test/Fixtures/lessjs (1.6)/less/errors/property-asterisk-only-name.txt
deleted file mode 100644
index 6adc6c69..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-asterisk-only-name.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ParseError: Unrecognised input in {path}property-asterisk-only-name.less on line 2, column 5:
-1 a {
-2     * : 1;
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-ie5-hack.less b/test/Fixtures/lessjs (1.6)/less/errors/property-ie5-hack.less
deleted file mode 100644
index 51bf6e39..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-ie5-hack.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.test {
-  display/*/: block; /*sorry for IE5*/
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-ie5-hack.txt b/test/Fixtures/lessjs (1.6)/less/errors/property-ie5-hack.txt
deleted file mode 100644
index e42ef90e..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-ie5-hack.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ParseError: Unrecognised input in {path}property-ie5-hack.less on line 2, column 3:
-1 .test {
-2   display/*/: block; /*sorry for IE5*/
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root.less b/test/Fixtures/lessjs (1.6)/less/errors/property-in-root.less
deleted file mode 100644
index 8fed4be3..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-.a() {
-  prop:1;
-}
-.a();
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root.txt b/test/Fixtures/lessjs (1.6)/less/errors/property-in-root.txt
deleted file mode 100644
index 04b27766..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: properties must be inside selector blocks, they cannot be in the root. in {path}property-in-root.less on line 2, column 3:
-1 .a() {
-2   prop:1;
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root2.less b/test/Fixtures/lessjs (1.6)/less/errors/property-in-root2.less
deleted file mode 100644
index ce8656d1..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root2.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "property-in-root";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root2.txt b/test/Fixtures/lessjs (1.6)/less/errors/property-in-root2.txt
deleted file mode 100644
index 04b27766..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: properties must be inside selector blocks, they cannot be in the root. in {path}property-in-root.less on line 2, column 3:
-1 .a() {
-2   prop:1;
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root3.less b/test/Fixtures/lessjs (1.6)/less/errors/property-in-root3.less
deleted file mode 100644
index 056c2f72..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root3.less	
+++ /dev/null
@@ -1,4 +0,0 @@
-prop:1;
-.a {
-  prop:1;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root3.txt b/test/Fixtures/lessjs (1.6)/less/errors/property-in-root3.txt
deleted file mode 100644
index 68ef9454..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-in-root3.txt	
+++ /dev/null
@@ -1,3 +0,0 @@
-SyntaxError: properties must be inside selector blocks, they cannot be in the root. in {path}property-in-root3.less on line 1, column 1:
-1 prop:1;
-2 .a {
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-interp-not-defined.less b/test/Fixtures/lessjs (1.6)/less/errors/property-interp-not-defined.less
deleted file mode 100644
index 544fd5f9..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-interp-not-defined.less	
+++ /dev/null
@@ -1 +0,0 @@
-a {outline-@{color}: green}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/property-interp-not-defined.txt b/test/Fixtures/lessjs (1.6)/less/errors/property-interp-not-defined.txt
deleted file mode 100644
index 2537f9ea..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/property-interp-not-defined.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-NameError: variable @color is undefined in {path}property-interp-not-defined.less on line 1, column 12:
-1 a {outline-@{color}: green}
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/recursive-variable.less b/test/Fixtures/lessjs (1.6)/less/errors/recursive-variable.less
deleted file mode 100644
index c1ca75f1..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/recursive-variable.less	
+++ /dev/null
@@ -1 +0,0 @@
-@bodyColor: darken(@bodyColor, 30%);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/recursive-variable.txt b/test/Fixtures/lessjs (1.6)/less/errors/recursive-variable.txt
deleted file mode 100644
index eb616e7d..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/recursive-variable.txt	
+++ /dev/null
@@ -1,2 +0,0 @@
-NameError: Recursive variable definition for @bodyColor in {path}recursive-variable.less on line 1, column 20:
-1 @bodyColor: darken(@bodyColor, 30%);
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient1.less b/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient1.less
deleted file mode 100644
index c069ff72..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient1.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: svg-gradient(horizontal, black, white);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient1.txt b/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient1.txt
deleted file mode 100644
index ec662fe6..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient1.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `svg-gradient`: svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center' in {path}svg-gradient1.less on line 2, column 6:
-1 .a {
-2   a: svg-gradient(horizontal, black, white);
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient2.less b/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient2.less
deleted file mode 100644
index ff14ef11..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient2.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: svg-gradient(to bottom, black, orange, 45%, white);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient2.txt b/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient2.txt
deleted file mode 100644
index 7004115f..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient2.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `svg-gradient`: svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position] in {path}svg-gradient2.less on line 2, column 6:
-1 .a {
-2   a: svg-gradient(to bottom, black, orange, 45%, white);
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient3.less b/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient3.less
deleted file mode 100644
index 8f185246..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient3.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: svg-gradient(black, orange);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient3.txt b/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient3.txt
deleted file mode 100644
index eb0b483e..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/svg-gradient3.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `svg-gradient`: svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position] in {path}svg-gradient3.less on line 2, column 6:
-1 .a {
-2   a: svg-gradient(black, orange);
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/unit-function.less b/test/Fixtures/lessjs (1.6)/less/errors/unit-function.less
deleted file mode 100644
index 119e9818..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/unit-function.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  font-size: unit(80/16,rem);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/errors/unit-function.txt b/test/Fixtures/lessjs (1.6)/less/errors/unit-function.txt
deleted file mode 100644
index baf90f42..00000000
--- a/test/Fixtures/lessjs (1.6)/less/errors/unit-function.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-ArgumentError: error evaluating function `unit`: the first argument to unit must be a number. Have you forgotten parenthesis? in {path}unit-function.less on line 2, column 14:
-1 .a {
-2   font-size: unit(80/16,rem);
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/extend-chaining.less b/test/Fixtures/lessjs (1.6)/less/extend-chaining.less
deleted file mode 100644
index aad221ea..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extend-chaining.less	
+++ /dev/null
@@ -1,91 +0,0 @@
-//very simple chaining
-.a {
-  color: black;
-}
-.b:extend(.a) {}
-.c:extend(.b) {}
-
-//very simple chaining, ordering not important
-
-.d:extend(.e) {}
-.e:extend(.f) {}
-.f {
-  color: black;
-}
-
-//extend with all
-
-.g.h {
-  color: black;
-}
-.i.j:extend(.g all) {
-  color: white;
-}
-.k:extend(.i all) {}
-
-//extend multi-chaining
-
-.l {
-  color: black;
-}
-.m:extend(.l){}
-.n:extend(.m){}
-.o:extend(.n){}
-.p:extend(.o){}
-.q:extend(.p){}
-.r:extend(.q){}
-.s:extend(.r){}
-.t:extend(.s){}
-
-// self referencing is ignored
-
-.u {color: black;}
-.v.u.v:extend(.u all){}
-
-// circular reference because the new extend product will match the existing extend
-
-.w:extend(.w) {color: black;}
-.v.w.v:extend(.w all){}
-
-// classic circular references
-
-.x:extend(.z) {
-  color: x;
-}
-.y:extend(.x) {
-  color: y;
-}
-.z:extend(.y) {
-  color: z;
-}
-
-//very simple chaining, but with the extend inside the ruleset
-.va {
-  color: black;
-}
-.vb {
-  &:extend(.va);
-  color: white;
-}
-.vc {
-  &:extend(.vb);
-}
-
-// media queries - dont extend outside, do extend inside
-
-@media tv {
-  .ma:extend(.a,.b,.c,.d,.e,.f,.g,.h,.i,.j,.k,.l,.m,.n,.o,.p,.q,.r,.s,.t,.u,.v,.w,.x,.y,.z,.md) {
-    color: black;
-  }
-  .md {
-    color: white;
-  }
-  @media plasma {
-    .me, .mf {
-      &:extend(.mb,.md);
-      background: red;
-    }
-  }
-}
-.mb:extend(.ma) {};
-.mc:extend(.mb) {};
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/extend-clearfix.less b/test/Fixtures/lessjs (1.6)/less/extend-clearfix.less
deleted file mode 100644
index 82445dfa..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extend-clearfix.less	
+++ /dev/null
@@ -1,19 +0,0 @@
-.clearfix {
-  *zoom: 1;
-  &:after {
-    content: '';
-    display: block;
-    clear: both;
-    height: 0;
-  }
-}
-
-.foo {
-  &:extend(.clearfix all);
-  color: red;
-}
-
-.bar {
-  &:extend(.clearfix all);
-  color: blue;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/extend-exact.less b/test/Fixtures/lessjs (1.6)/less/extend-exact.less
deleted file mode 100644
index 41dc4130..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extend-exact.less	
+++ /dev/null
@@ -1,46 +0,0 @@
-.replace.replace,
-.c.replace + .replace {
-  .replace,
-  .c {
-    prop: copy-paste-replace;
-  }
-}
-.rep_ace:extend(.replace.replace .replace) {}
-
-.a .b .c {
-  prop: not_effected;
-}
-
-.a {
-  prop: is_effected;
-  .b {
-    prop: not_effected;
-  }
-  .b.c {
-    prop: not_effected;
-  }
-}
-
-.c, .a {
-  .b, .a {
-    .a, .c {
-      prop: not_effected;
-    }
-  }
-}
-
-.effected {
-  &:extend(.a);
-  &:extend(.b);
-  &:extend(.c);
-}
-
-.e {
-  && {
-    prop: extend-double;
-    &:hover {
-      hover: not-extended;
-    }
-  }
-}
-.dbl:extend(.e.e) {}
diff --git a/test/Fixtures/lessjs (1.6)/less/extend-media.less b/test/Fixtures/lessjs (1.6)/less/extend-media.less
deleted file mode 100644
index 1b22c3fa..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extend-media.less	
+++ /dev/null
@@ -1,24 +0,0 @@
-.ext1 .ext2 {
-  background: black;
-}
-
-@media tv {
-  .ext1 .ext3 {
-    color: white;
-  }
-  .tv-lowres :extend(.ext1 all) {
-    background: blue;
-  }
-  @media hires {
-    .ext1 .ext4 {
-      color: green;
-    }
-    .tv-hires :extend(.ext1 all) {
-      background: red;
-    }
-  }
-}
-
-.all:extend(.ext1 all) {
-
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/extend-nest.less b/test/Fixtures/lessjs (1.6)/less/extend-nest.less
deleted file mode 100644
index 9d4d27bb..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extend-nest.less	
+++ /dev/null
@@ -1,65 +0,0 @@
-.sidebar {
-  width: 300px;
-  background: red;
-
-  .box {
-    background: #FFF;
-    border: 1px solid #000;
-    margin: 10px 0;
-  }
-}
-
-.sidebar2 {
-  &:extend(.sidebar all);
-  background: blue;
-}
-
-.type1 {
-    .sidebar3 {
-      &:extend(.sidebar all);
-      background: green;
-    }
-}
-
-.type2 {
-  &.sidebar4 {
-    &:extend(.sidebar all);
-    background: red;
-  }
-}
-
-.button {
-  color: black;
-  &:hover {
-    color: white;
-  }
-}
-.submit {
-  &:extend(.button);
-  &:hover:extend(.button:hover) {}
-}
-
-.nomatch {
-  &:hover:extend(.button :hover) {}
-}
-
-.button2 {
-  :hover {
-    nested: white;
-  }
-}
-.button2 :hover {
-  notnested: black;
-}
-
-.nomatch :extend(.button2:hover) {}
-
-.amp-test-a,
-.amp-test-b {
-  .amp-test-c &.amp-test-d&.amp-test-e {
-    .amp-test-f&+&.amp-test-g:extend(.amp-test-h) {}
-  }
-}
-.amp-test-h {
-  test: extended by masses of selectors;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/extend-selector.less b/test/Fixtures/lessjs (1.6)/less/extend-selector.less
deleted file mode 100644
index c7588ee0..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extend-selector.less	
+++ /dev/null
@@ -1,99 +0,0 @@
-.error {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error {
-  display: none;
-}
-.badError:extend(.error all) {
-  border-width: 3px;
-}
-
-.foo .bar, .foo .baz {
-    display: none;
-}
-
-.ext1 .ext2
-    :extend(.foo all) {
-}
-
-.ext3:extend(.foo all),
-.ext4:extend(.foo all) {
-}
-
-div.ext5,
-.ext6 > .ext5 {
-    width: 100px;
-}
-
-.should-not-exist-in-output,
-.ext7:extend(.ext5 all) {
-}
-
-.ext {
-  test: 1;
-}
-// same as 
-// .a .c:extend(.ext all)
-// .b .c:extend(.ext all)
-// .a .c .d
-// .b .c .d
-.a, .b {
-  test: 2;
-  .c:extend(.ext all) {
-    test: 3;
-    .d {
-      test: 4;
-    }
-  }
-}
-
-.replace.replace,
-.c.replace + .replace {
-  .replace,
-  .c {
-    prop: copy-paste-replace;
-  }
-}
-.rep_ace:extend(.replace all) {}
-
-.attributes {
-  [data="test"] {
-    extend: attributes;
-  }
-  .attribute-test {
-    &:extend([data="test"] all);
-  }
-  [data] {
-    extend: attributes2;
-  }
-  .attribute-test2 {
-    &:extend([data] all); //you could argue it should match [data="test"]... not for now though...
-  }
-  @attr-data: "test3";
-  [data=@{attr-data}] {
-    extend: attributes2;
-  }
-  .attribute-test {
-    &:extend([data="test3"] all);
-  }
-}
-
-.header {
-  .header-nav {
-    background: red;
-    &:before {
-      background: blue;
-    }
-  }
-}
-
-.footer {
-  .footer-nav {
-    &:extend( .header .header-nav all );
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/extend.less b/test/Fixtures/lessjs (1.6)/less/extend.less
deleted file mode 100644
index 1db5d431..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extend.less	
+++ /dev/null
@@ -1,81 +0,0 @@
-.error {
-  border: 1px #f00;
-  background: #fdd;
-}
-.error.intrusion {
-  font-size: 1.3em;
-  font-weight: bold;
-}
-.intrusion .error {
-  display: none;
-}
-.badError {
-  &:extend(.error all);
-  border-width: 3px;
-}
-
-.foo .bar, .foo .baz {
-    display: none;
-}
-
-.ext1 .ext2 {
-    &:extend(.foo all);
-}
-
-.ext3,
-.ext4 {
-  &:extend(.foo all);
-  &:extend(.bar all);
-}
-
-div.ext5,
-.ext6 > .ext5 {
-    width: 100px;
-}
-
-.ext7 {
-    &:extend(.ext5 all);
-}
-
-.ext8.ext9 {
-  result: add-foo;
-}
-.ext8 .ext9,
-.ext8 + .ext9,
-.ext8 > .ext9 {
-  result: bar-matched;
-}
-.ext8.nomatch {
-  result: none;
-}
-.ext8 {
-  .ext9 {
-    result: match-nested-bar;
-  }
-}
-.ext8 {
-  &.ext9 {
-    result: match-nested-foo;
-  }
-}
-
-.fuu:extend(.ext8.ext9 all) {}
-.buu:extend(.ext8 .ext9 all) {}
-.zap:extend(.ext8 + .ext9 all) {}
-.zoo:extend(.ext8 > .ext9 all) {}
-
-.aa {
-  color: black;
-  .dd {
-    background: red;
-  }
-}
-.bb {
-  background: red;
-  .bb {
-    color: black;
-  }
-}
-.cc:extend(.aa,.bb) {}
-.ee:extend(.dd all,.bb) {}
-.ff:extend(.dd,.bb all) {}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/extract-and-length.less b/test/Fixtures/lessjs (1.6)/less/extract-and-length.less
deleted file mode 100644
index d81e118f..00000000
--- a/test/Fixtures/lessjs (1.6)/less/extract-and-length.less	
+++ /dev/null
@@ -1,133 +0,0 @@
-
-// simple array/list:
-
-.multiunit {
-  @v: abc "abc" 1 1px 1% #123;
-  length: length(@v);
-  extract: extract(@v, 1) extract(@v, 2) extract(@v, 3) extract(@v, 4) extract(@v, 5) extract(@v, 6);
-}
-
-.incorrect-index {
-    @v1: a  b  c;
-    @v2: a, b, c;
-    v1: extract(@v1,  5);
-    v2: extract(@v2, -2);
-}
-
-.scalar {
-    @var:          variable;
-    var-value:     extract(@var, 1);
-    var-length:    length(@var);
-    ill-index:     extract(@var, 2);
-
-    name-value:    extract(name, 1);
-    string-value:  extract("string", 1);
-    number-value:  extract(12345678, 1);
-    color-value:   extract(blue, 1);
-    rgba-value:    extract(rgba(80, 160, 240, 0.67), 1);
-    empty-value:   extract(~'', 1);
-    
-    name-length:   length(name);
-    string-length: length("string");
-    number-length: length(12345678);
-    color-length:  length(blue);
-    rgba-length:   length(rgba(80, 160, 240, 0.67));
-    empty-length:  length(~'');
-}
-
-.mixin-arguments {
-    .mixin-args(a b c d);
-    .mixin-args(a, b, c, d);
-    .mixin-args(1; 2; 3; 4);
-}
-
-.mixin-args(@value) {
-    &-1 {
-        length:  length(@value);
-        extract: extract(@value, 3) ~"|" extract(@value, 2) ~"|" extract(@value, 1);
-    }
-}
-
-.mixin-args(...) { 
-    &-2 {
-        length:  length(@arguments);
-        extract: extract(@arguments, 3) ~"|" extract(@arguments, 2) ~"|" extract(@arguments, 1);
-    }
-}
-
-.mixin-args(@values...) {
-    &-3 {
-        length:  length(@values);
-        extract: extract(@values, 3) ~"|" extract(@values, 2) ~"|" extract(@values, 1);
-    }
-}
-
-.mixin-args(@head, @tail...) {
-    &-4 {
-        length:  length(@tail);
-        extract: extract(@tail, 2) ~"|" extract(@tail, 1);
-    }
-}
-
-// "multidimensional" array/list
-
-.md-space-comma {
-    @v: a b c, 1 2 3, "x" "y" "z";
-    length-1:  length(@v);
-    extract-1: extract(@v, 2);
-    length-2:  length(extract(@v, 2));
-    extract-2: extract(extract(@v, 2), 2);
-
-    &-as-args {.mixin-args(a b c, 1 2 3, "x" "y" "z")}
-}
-
-.md-cat-space-comma {
-    @a: a b c;
-    @b: 1 2 3;
-    @c: "x" "y" "z";
-    @v: @a, @b, @c;
-    length-1:  length(@v);
-    extract-1: extract(@v, 2);
-    length-2:  length(extract(@v, 2));
-    extract-2: extract(extract(@v, 2), 2);
-    
-    &-as-args {.mixin-args(@a, @b, @c)}
-}
-
-.md-cat-comma-space {
-    @a: a, b, c;
-    @b: 1, 2, 3;
-    @c: "x", "y", "z";
-    @v: @a @b @c;
-    length-1:  length(@v);
-    extract-1: extract(@v, 2);
-    length-2:  length(extract(@v, 2));
-    extract-2: extract(extract(@v, 2), 2);
-
-    &-as-args {.mixin-args(@a @b @c)}
-}
-
-.md-3D {
-    @a: a b c d, 1 2 3 4;
-    @b: 5 6 7 8, e f g h;
-    .3D(@a, @b);
-    
-    .3D(...) {
-
-        @v1:       @arguments;
-        length-1:  length(@v1);
-        extract-1: extract(@v1, 1);
-        
-        @v2:       extract(@v1, 2);
-        length-2:  length(@v2);
-        extract-2: extract(@v2, 1);
-        
-        @v3:       extract(@v2, 1);
-        length-3:  length(@v3);
-        extract-3: extract(@v3, 3);
-
-        @v4:       extract(@v3, 4);
-        length-4:  length(@v4);
-        extract-4: extract(@v4, 1);
-    }
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/functions.less b/test/Fixtures/lessjs (1.6)/less/functions.less
deleted file mode 100644
index 170a915b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/functions.less	
+++ /dev/null
@@ -1,155 +0,0 @@
-#functions {
-  @var: 10;
-  @colors: #000, #fff;
-  color: _color("evil red"); // #660000
-  width: increment(15);
-  height: undefined("self");
-  border-width: add(2, 3);
-  variable: increment(@var);
-  background: linear-gradient(@colors);
-}
-
-#built-in {
-  @r: 32;
-  escaped: e("-Some::weird(#thing, y)");
-  lighten: lighten(#ff0000, 40%);
-  darken: darken(#ff0000, 40%);
-  saturate: saturate(#29332f, 20%);
-  desaturate: desaturate(#203c31, 20%);
-  greyscale: greyscale(#203c31);
-  hsl-clamp: hsl(380, 150%, 150%);
-  spin-p: spin(hsl(340, 50%, 50%), 40);
-  spin-n: spin(hsl(30, 50%, 50%), -40);
-  luma-white: luma(#fff);
-  luma-black: luma(#000);
-  luma-black-alpha: luma(rgba(0,0,0,0.5));
-  luma-red: luma(#ff0000);
-  luma-green: luma(#00ff00);
-  luma-blue: luma(#0000ff);
-  luma-yellow: luma(#ffff00);
-  luma-cyan: luma(#00ffff);
-  luma-white-alpha: luma(rgba(255,255,255,0.5));
-  contrast-filter: contrast(30%);
-  saturate-filter: saturate(5%);
-  contrast-white: contrast(#fff);
-  contrast-black: contrast(#000);
-  contrast-red: contrast(#ff0000);
-  contrast-green: contrast(#00ff00);
-  contrast-blue: contrast(#0000ff);
-  contrast-yellow: contrast(#ffff00);
-  contrast-cyan: contrast(#00ffff);
-  contrast-light: contrast(#fff, #111111, #eeeeee);
-  contrast-dark: contrast(#000, #111111, #eeeeee);
-  contrast-wrongorder: contrast(#fff, #eeeeee, #111111, 0.5);
-  contrast-light-thresh: contrast(#fff, #111111, #eeeeee, 0.5);
-  contrast-dark-thresh: contrast(#000, #111111, #eeeeee, 0.5);
-  contrast-high-thresh: contrast(#555, #111111, #eeeeee, 0.6);
-  contrast-low-thresh: contrast(#555, #111111, #eeeeee, 0.1);
-  contrast-light-thresh-per: contrast(#fff, #111111, #eeeeee, 50%);
-  contrast-dark-thresh-per: contrast(#000, #111111, #eeeeee, 50%);
-  contrast-high-thresh-per: contrast(#555, #111111, #eeeeee, 60%);
-  contrast-low-thresh-per: contrast(#555, #111111, #eeeeee, 10%);
-  format: %("rgb(%d, %d, %d)", @r, 128, 64);
-  format-string: %("hello %s", "world");
-  format-multiple: %("hello %s %d", "earth", 2);
-  format-url-encode: %('red is %A', #ff0000);
-  eformat: e(%("rgb(%d, %d, %d)", @r, 128, 64));
-  
-  unitless: unit(12px);
-  unit: unit((13px + 1px), em);
-
-  hue: hue(hsl(98, 12%, 95%));
-  saturation: saturation(hsl(98, 12%, 95%));
-  lightness: lightness(hsl(98, 12%, 95%));
-  hsvhue: hsvhue(hsv(98, 12%, 95%));
-  hsvsaturation: hsvsaturation(hsv(98, 12%, 95%));
-  hsvvalue: hsvvalue(hsv(98, 12%, 95%));
-  red: red(#f00);
-  green: green(#0f0);
-  blue: blue(#00f);
-  rounded: round((@r/3));
-  rounded-two: round((@r/3), 2);
-  roundedpx: round((10px / 3));
-  roundedpx-three: round((10px / 3), 3);
-  rounded-percentage: round(10.2%);
-  ceil: ceil(10.1px);
-  floor: floor(12.9px);
-  sqrt: sqrt(25px);
-  pi: pi();
-  mod: mod(13m, 11cm); // could take into account units, doesn't at the moment
-  abs: abs(-4%);
-  tan: tan(42deg);
-  sin: sin(10deg);
-  cos: cos(12);
-  atan: atan(tan(0.1rad));
-  atan: convert(acos(cos(34deg)), deg);
-  atan: convert(acos(cos(50grad)), deg);
-  pow: pow(8px, 2);
-  pow: pow(4, 3);
-  pow: pow(3, 3em);
-  min: min(0);
-  min: min("junk", 6, 5);
-  min: min(1pc, 3pt);
-  max: max(1, 3);
-  max: max(3%, 1cm, 8%, 2mm);
-  percentage: percentage((10px / 50));
-  color: color("#ff0011");
-  tint: tint(#777777, 13);
-  tint-full: tint(#777777, 100);
-  tint-percent: tint(#777777, 13%);
-  tint-negative: tint(#777777, -13%);
-  shade: shade(#777777, 13);
-  shade-full: shade(#777777, 100);
-  shade-percent: shade(#777777, 13%);
-  shade-negative: shade(#777777, -13%);
-
-  fade-out: fadeOut(red, 5%); // support fadeOut and fadeout
-  fade-in: fadein(fadeout(red, 10%), 5%);
-  
-  hsv: hsv(5, 50%, 30%);
-  hsva: hsva(3, 50%, 30%, 0.2);
-
-  mix: mix(#ff0000, #ffff00, 80);
-  mix-0: mix(#ff0000, #ffff00, 0);
-  mix-100: mix(#ff0000, #ffff00, 100);
-  mix-weightless: mix(#ff0000, #ffff00);
-  mixt: mix(#ff0000, transparent);
-
-  .is-a {
-    color: iscolor(#ddd);
-    color1: iscolor(red);
-    color2: iscolor(rgb(0, 0, 0));
-    color3: iscolor(transparent);
-    keyword: iskeyword(hello);
-    number: isnumber(32);
-    string: isstring("hello");
-    pixel: ispixel(32px);
-    percent: ispercentage(32%);
-    em: isem(32em);
-    cat: isunit(32cat, cat);
-  }
-}
-
-#alpha {
-  alpha: darken(hsla(25, 50%, 50%, 0.6), 10%);
-  alpha2: alpha(rgba(3, 4, 5, 0.5));
-  alpha3: alpha(transparent);
-}
-
-#blendmodes {
-  multiply: multiply(#f60000, #f60000);
-  screen: screen(#f60000, #0000f6);
-  overlay: overlay(#f60000, #0000f6);
-  softlight: softlight(#f60000, #ffffff);
-  hardlight: hardlight(#f60000, #0000f6);
-  difference: difference(#f60000, #0000f6);
-  exclusion: exclusion(#f60000, #0000f6);
-  average: average(#f60000, #0000f6);
-  negation: negation(#f60000, #313131);
-}
-
-#extract-and-length {
-  @anon: A B C 1 2 3;
-  extract: extract(@anon, 6) extract(@anon, 5) extract(@anon, 4) extract(@anon, 3) extract(@anon, 2) extract(@anon, 1);
-  length: length(@anon);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/globalVars/extended.json b/test/Fixtures/lessjs (1.6)/less/globalVars/extended.json
deleted file mode 100644
index 6bd2a484..00000000
--- a/test/Fixtures/lessjs (1.6)/less/globalVars/extended.json	
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "the-border": "1px",
-    "base-color": "#111",
-    "red": "#842210"
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/globalVars/extended.less b/test/Fixtures/lessjs (1.6)/less/globalVars/extended.less
deleted file mode 100644
index 7a3bf291..00000000
--- a/test/Fixtures/lessjs (1.6)/less/globalVars/extended.less	
+++ /dev/null
@@ -1,10 +0,0 @@
-#header {
-  color: (@base-color * 3);
-  border-left: @the-border;
-  border-right: (@the-border * 2);
-}
-#footer {
-  color: (@base-color + #003300);
-  border-color: @red;
-}
-@red: desaturate(red, 10%); // less file overrides passed in color <- note line comment on last line to check it is okay
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/globalVars/simple.json b/test/Fixtures/lessjs (1.6)/less/globalVars/simple.json
deleted file mode 100644
index 76a63c5a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/globalVars/simple.json	
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-	"my-color": "red"
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/globalVars/simple.less b/test/Fixtures/lessjs (1.6)/less/globalVars/simple.less
deleted file mode 100644
index c3c5e3b8..00000000
--- a/test/Fixtures/lessjs (1.6)/less/globalVars/simple.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.class {
-  color: @my-color;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/ie-filters.less b/test/Fixtures/lessjs (1.6)/less/ie-filters.less
deleted file mode 100644
index 3350b653..00000000
--- a/test/Fixtures/lessjs (1.6)/less/ie-filters.less	
+++ /dev/null
@@ -1,15 +0,0 @@
-@fat: 0;
-@cloudhead: "#000000";
-
-.nav {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity = 20);
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=@fat);
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#333333", endColorstr=@cloudhead, GradientType=@fat);
-}
-.evalTest(@arg) {
-  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=@arg);
-}
-.evalTest1 {
-  .evalTest(30);
-  .evalTest(5);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import-inline.less b/test/Fixtures/lessjs (1.6)/less/import-inline.less
deleted file mode 100644
index 95a11896..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import-inline.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-@import (inline) url("import/import-test-d.css") (min-width:600px);
-@import (inline, css) url("import/invalid-css.less");
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import-interpolation.less b/test/Fixtures/lessjs (1.6)/less/import-interpolation.less
deleted file mode 100644
index 21cfe086..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import-interpolation.less	
+++ /dev/null
@@ -1,8 +0,0 @@
-@my_theme: "test";
-
-@import "import/import-@{my_theme}-e.less";
-
-@import "import/import-@{in}@{terpolation}.less";
-
-@in: "in";
-@terpolation: "terpolation";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import-once.less b/test/Fixtures/lessjs (1.6)/less/import-once.less
deleted file mode 100644
index 0a4024a3..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import-once.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@import "import/import-once-test-c";
-@import "import/import-once-test-c";
-@import "import/import-once-test-c.less";
-@import "import/deeper/import-once-test-a";
-@import (multiple) "import/import-test-f.less";
-@import (multiple) "import/import-test-f.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import-reference.less b/test/Fixtures/lessjs (1.6)/less/import-reference.less
deleted file mode 100644
index cf9da168..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import-reference.less	
+++ /dev/null
@@ -1,18 +0,0 @@
-@import (reference) url("import-once.less");
-@import (reference) url("css-3.less");
-@import (reference) url("media.less");
-/*
-  The media statement above is invalid (no selector)
-  We should ban invalid media queries with properties and no selector?
-*/
-@import (reference) url("import/import-reference.less");
-
-.b {
-  .z();
-}
-
-.zz();
-
-.visible:extend(.z all) {
-  extend: test;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import.less b/test/Fixtures/lessjs (1.6)/less/import.less
deleted file mode 100644
index 01689408..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import.less	
+++ /dev/null
@@ -1,21 +0,0 @@
-@import url(http://fonts.googleapis.com/css?family=Open+Sans);
-
-@import url(/absolute/something.css) screen and (color) and (max-width: 600px);
-
-@var: 100px;
-@import url("//ha.com/file.css") (min-width:@var);
-
-#import-test {
-  .mixin;
-  width: 10px;
-  height: (@a + 10%);
-}
-@import "import/import-test-e" screen and (max-width: 600px);
-
-@import url("import/import-test-a.less");
-
-@import (less, multiple) "import/import-test-d.css" screen and (max-width: 601px);
-
-@import (multiple) "import/import-test-e" screen and (max-width: 602px);
-
-@import (less, multiple) url("import/import-test-d.css") screen and (max-width: 603px);
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/deeper/import-once-test-a.less b/test/Fixtures/lessjs (1.6)/less/import/deeper/import-once-test-a.less
deleted file mode 100644
index 8a747fc0..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/deeper/import-once-test-a.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "../import-once-test-c";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-and-relative-paths-test.less b/test/Fixtures/lessjs (1.6)/less/import/import-and-relative-paths-test.less
deleted file mode 100644
index d6256c6b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-and-relative-paths-test.less	
+++ /dev/null
@@ -1,17 +0,0 @@
-@import "../css/background.css";
-@import "import-test-d.css";
-
-@import "imports/logo";
-@import "imports/font";
-
-.unquoted-relative-path-bg() {
-    background-image: url(../../data/image.jpg);
-}
-.quoted-relative-path-border-image() {
-    border-image: url('../../data/image.jpg');
-}
-
-#imported-relative-path {
-    .unquoted-relative-path-bg;
-    .quoted-relative-path-border-image;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-charset-test.less b/test/Fixtures/lessjs (1.6)/less/import/import-charset-test.less
deleted file mode 100644
index 07a66e1a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-charset-test.less	
+++ /dev/null
@@ -1 +0,0 @@
-@charset "ISO-8859-1";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-interpolation.less b/test/Fixtures/lessjs (1.6)/less/import/import-interpolation.less
deleted file mode 100644
index aa49a702..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-interpolation.less	
+++ /dev/null
@@ -1 +0,0 @@
-@import "import-@{in}@{terpolation}2.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-interpolation2.less b/test/Fixtures/lessjs (1.6)/less/import/import-interpolation2.less
deleted file mode 100644
index 12bfb4e1..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-interpolation2.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-.a {
-  var: test;
-}
-
-@in: "redefined-does-nothing";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-once-test-c.less b/test/Fixtures/lessjs (1.6)/less/import/import-once-test-c.less
deleted file mode 100644
index 686747a8..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-once-test-c.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-
-@c: red;
-
-#import {
-  color: @c;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-reference.less b/test/Fixtures/lessjs (1.6)/less/import/import-reference.less
deleted file mode 100644
index 9eac45fc..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-reference.less	
+++ /dev/null
@@ -1,43 +0,0 @@
-.z {
-  color: red;
-  .c {
-    color: green;
-  }
-}
-.only-with-visible,
-.z {
-  color: green;
-  &:hover {
-    color: green;
-  }
-  & {
-    color: green;
-  }
-  & + & {
-    color: green;
-    .sub {
-      color: green;
-    }
-  }
-}
-
-& {
-  .hidden {
-    hidden: true;
-  }
-}
-
-@media tv {
-  .hidden {
-    hidden: true;
-  }
-}
-
-/* comment is not output */
-
-.zz {
-  .y {
-    pulled-in: yes;
-  }
-  /* comment pulled in */
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-test-a.less b/test/Fixtures/lessjs (1.6)/less/import/import-test-a.less
deleted file mode 100644
index b3b3b8fc..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-test-a.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-@import "import-test-b.less";
-@a: 20%;
-@import "urls.less";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-test-b.less b/test/Fixtures/lessjs (1.6)/less/import/import-test-b.less
deleted file mode 100644
index ce2d35a8..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-test-b.less	
+++ /dev/null
@@ -1,8 +0,0 @@
-@import "import-test-c";
-
-@b: 100%;
-
-.mixin {
-  height: 10px;
-  color: @c;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-test-c.less b/test/Fixtures/lessjs (1.6)/less/import/import-test-c.less
deleted file mode 100644
index 686747a8..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-test-c.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-
-@c: red;
-
-#import {
-  color: @c;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-test-d.css b/test/Fixtures/lessjs (1.6)/less/import/import-test-d.css
deleted file mode 100644
index 30575f01..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-test-d.css	
+++ /dev/null
@@ -1 +0,0 @@
-#css { color: yellow; }
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-test-e.less b/test/Fixtures/lessjs (1.6)/less/import/import-test-e.less
deleted file mode 100644
index 98b84b0a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-test-e.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-
-body { width: 100% }
diff --git a/test/Fixtures/lessjs (1.6)/less/import/import-test-f.less b/test/Fixtures/lessjs (1.6)/less/import/import-test-f.less
deleted file mode 100644
index fad630f9..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/import-test-f.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-@import "import-test-e";
-
-.test-f {
-  height: 10px;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/import/imports/font.less b/test/Fixtures/lessjs (1.6)/less/import/imports/font.less
deleted file mode 100644
index 5abb7e76..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/imports/font.less	
+++ /dev/null
@@ -1,8 +0,0 @@
-@font-face {
-	font-family: xecret;
-	src: url('../assets/xecret.ttf');
-}
-
-#secret {
-	font-family: xecret, sans-serif;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/import/imports/logo.less b/test/Fixtures/lessjs (1.6)/less/import/imports/logo.less
deleted file mode 100644
index 22893a23..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/imports/logo.less	
+++ /dev/null
@@ -1,5 +0,0 @@
-#logo {
-  width: 100px;
-  height: 100px;
-  background: url('../assets/logo.png');
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/import/invalid-css.less b/test/Fixtures/lessjs (1.6)/less/import/invalid-css.less
deleted file mode 100644
index ed585d63..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/invalid-css.less	
+++ /dev/null
@@ -1 +0,0 @@
-this isn't very valid CSS.
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/import/urls.less b/test/Fixtures/lessjs (1.6)/less/import/urls.less
deleted file mode 100644
index bb48f77a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/import/urls.less	
+++ /dev/null
@@ -1 +0,0 @@
-// empty file showing that it loads from the relative path first
diff --git a/test/Fixtures/lessjs (1.6)/less/javascript.less b/test/Fixtures/lessjs (1.6)/less/javascript.less
deleted file mode 100644
index b826a787..00000000
--- a/test/Fixtures/lessjs (1.6)/less/javascript.less	
+++ /dev/null
@@ -1,29 +0,0 @@
-.eval {
-    js: `42`;
-    js: `1 + 1`;
-    js: `"hello world"`;
-    js: `[1, 2, 3]`;
-    title: `typeof process.title`;
-    ternary: `(1 + 1 == 2 ? true : false)`;
-    multiline: `(function(){var x = 1 + 1;
-           return x})()`;
-}
-.scope {
-    @foo: 42;
-    var: `parseInt(this.foo.toJS())`;
-    escaped: ~`2 + 5 + 'px'`;
-}
-.vars {
-    @var: `4 + 4`;
-    width: @var;
-}
-.escape-interpol {
-    @world: "world";
-    width: ~`"hello" + " " + @{world}`;
-}
-.arrays {
-    @ary:  1, 2, 3;
-    @ary2: 1  2  3;
-    ary: `@{ary}.join(', ')`;
-    ary1: `@{ary2}.join(', ')`;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/lazy-eval.less b/test/Fixtures/lessjs (1.6)/less/lazy-eval.less
deleted file mode 100644
index 72b3fd46..00000000
--- a/test/Fixtures/lessjs (1.6)/less/lazy-eval.less	
+++ /dev/null
@@ -1,6 +0,0 @@
-@var: @a;
-@a: 100%;
-
-.lazy-eval {
-  width: @var;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/legacy/legacy.less b/test/Fixtures/lessjs (1.6)/less/legacy/legacy.less
deleted file mode 100644
index 92d00088..00000000
--- a/test/Fixtures/lessjs (1.6)/less/legacy/legacy.less	
+++ /dev/null
@@ -1,7 +0,0 @@
-@media (-o-min-device-pixel-ratio: 2/1) {
-  .test-math-and-units {
-    font: ignores 0/0 rules;
-    test-division: 4 / 2 + 5em;
-    simple: 1px + 1px;
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/media.less b/test/Fixtures/lessjs (1.6)/less/media.less
deleted file mode 100644
index 01a6a020..00000000
--- a/test/Fixtures/lessjs (1.6)/less/media.less	
+++ /dev/null
@@ -1,234 +0,0 @@
-
-// For now, variables can't be declared inside @media blocks.
-
-@var: 42;
-
-@media print {
-    .class {
-        color: blue;
-        .sub {
-            width: @var;
-        }
-    }
-    .top, header > h1 {
-        color: (#222 * 2);
-    }
-}
-
-@media screen {
-    @base: 8;
-    body { max-width: (@base * 60); }
-}
-
-@ratio_large: 16;
-@ratio_small: 9;
-
-@media all and (device-aspect-ratio: @ratio_large / @ratio_small) {
-   body { max-width: 800px; }
-}
-
-@media all and (orientation:portrait) {
-    aside { float: none; }
-}
-
-@media handheld and (min-width: @var), screen and (min-width: 20em) {
-    body {
-        max-width: 480px;
-    }
-}
-
-body {
-    @media print {
-        padding: 20px;
-
-        header {
-            background-color: red;
-        }
-
-        @media (orientation:landscape) {
-            margin-left: 20px;
-        }
-    }
-}
-
-@media screen {
-  .sidebar {
-    width: 300px;
-    @media (orientation: landscape) {
-      width: 500px;
-    }
-  }
-}
-
-@media a {
-  .first {
-    @media b {
-      .second {
-        .third {
-          width: 300px;
-          @media c {
-            width: 500px;
-          }
-        }
-        .fourth {
-          width: 3;
-        }
-      }
-    }
-  }
-}
-
-body {
-    @media a, b and c {
-        width: 95%;
-
-        @media x, y {
-            width: 100%;
-        }
-    }
-}
-
-.mediaMixin(@fallback: 200px) {
-    background: black;
-
-    @media handheld {
-        background: white;
-
-        @media (max-width: @fallback) {
-            background: red;
-        }
-    }
-}
-
-.a {
-  .mediaMixin(100px);
-}
-
-.b {
-  .mediaMixin();
-}
-@smartphone: ~"only screen and (max-width: 200px)";
-@media @smartphone {
-  body {
-    width: 480px;
-  }
-}
-
-@media print {
-  @page :left {
-    margin: 0.5cm;
-  }
-  @page :right {
-    margin: 0.5cm;
-  }
-  @page Test:first {
-    margin: 1cm;
-  }
-  @page :first {
-    size: 8.5in 11in;
-	@top-left {
-      margin: 1cm;
-    }
-    @top-left-corner {
-      margin: 1cm;
-    }
-    @top-center {
-      margin: 1cm;
-    }
-    @top-right {
-      margin: 1cm;
-    }
-    @top-right-corner {
-      margin: 1cm;
-    }
-    @bottom-left {
-      margin: 1cm;
-    }
-    @bottom-left-corner {
-      margin: 1cm;
-    }
-    @bottom-center {
-      margin: 1cm;
-    }
-    @bottom-right {
-      margin: 1cm;
-    }
-    @bottom-right-corner {
-      margin: 1cm;
-    }
-    @left-top {
-      margin: 1cm;
-    }
-    @left-middle {
-      margin: 1cm;
-    }
-    @left-bottom {
-      margin: 1cm;
-    }
-    @right-top {
-      margin: 1cm;
-    }
-    @right-middle {
-      content: "Page " counter(page);
-    }
-    @right-bottom {
-      margin: 1cm;
-    }
-  }
-}
-
-@media (-webkit-min-device-pixel-ratio: 2), (min--moz-device-pixel-ratio: 2), (-o-min-device-pixel-ratio: 2/1), (min-resolution: 2dppx), (min-resolution: 128dpcm) {
-  .b {
-    background: red;
-  }
-}
-
-.bg() {
-    background: red;
-
-    @media (max-width: 500px) {
-        background: green;
-    }
-}
-
-body {
-    .bg();
-}
-
-@bpMedium: 1000px;
-@media (max-width: @bpMedium) {
-    body {        
-        .bg();
-        background: blue;
-    }
-}
-
-@media (max-width: 1200px) {
-  /* a comment */
-
-  @media (max-width: 900px) {
-    body { font-size: 11px; }
-  }
-}
-
-.nav-justified {
-  @media (min-width: 480px) {
-    > li {
-      display: table-cell;
-    }
-  }
-}
-
-.menu
-{
-  @media (min-width: 768px) {
-    .nav-justified();
-  }
-}
-@all: ~"all";
-@tv: ~"tv";
-@media @all and @tv {
-  .all-and-tv-variables {
-    var: all-and-tv;
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/merge.less b/test/Fixtures/lessjs (1.6)/less/merge.less
deleted file mode 100644
index f7070d63..00000000
--- a/test/Fixtures/lessjs (1.6)/less/merge.less	
+++ /dev/null
@@ -1,59 +0,0 @@
-.first-transform() {
-  transform+: rotate(90deg), skew(30deg);
-}
-.second-transform() {
-  transform+: scale(2,4);
-}
-.third-transform() {
-  transform: scaleX(45deg);
-}
-.fourth-transform() {
-  transform+: scaleX(45deg);
-}
-.fifth-transform() {
-  transform+: scale(2,4) !important;
-}
-.first-background() {
-  background+: url(data://img1.png);
-}
-.second-background() {
-  background+: url(data://img2.png);
-}
-
-.test1 {
-  // Can merge values
-  .first-transform();
-  .second-transform();
-}
-.test2 {
-  // Wont merge values without +: merge directive, for backwards compatibility with css
-  .first-transform();
-  .third-transform();
-}
-.test3 {
-  // Wont merge values from two sources with different properties
-  .fourth-transform();
-  .first-background();
-}
-.test4 {
-  // Wont merge values from sources that merked as !important, for backwards compatibility with css
-  .first-transform();
-  .fifth-transform();
-}
-.test5 {
-  // Wont merge values from mixins that merked as !important, for backwards compatibility with css 
-  .first-transform();
-  .second-transform() !important;
-}
-.test6 {
-  // Ignores !merge if no peers found
-  .second-transform();
-}
-
-.test-interleaved {
-    transform+:  t1;
-    background+: b1;
-    transform+:  t2;
-    background+: b2, b3;
-    transform+:  t3;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-args.less b/test/Fixtures/lessjs (1.6)/less/mixins-args.less
deleted file mode 100644
index 8cdc67df..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-args.less	
+++ /dev/null
@@ -1,215 +0,0 @@
-.mixin (@a: 1px, @b: 50%) {
-  width: (@a * 5);
-  height: (@b - 1%);
-}
-
-.mixina (@style, @width, @color: black) {
-    border: @width @style @color;
-}
-
-.mixiny
-(@a: 0, @b: 0) {
-  margin: @a;
-  padding: @b;
-}
-
-.hidden() {
-  color: transparent; // asd
-}
-
-#hidden {
-  .hidden;
-}
-
-#hidden1 {
-  .hidden();
-}
-
-.two-args {
-  color: blue;
-  .mixin(2px, 100%);
-  .mixina(dotted, 2px);
-}
-
-.one-arg {
-  .mixin(3px);
-}
-
-.no-parens {
-  .mixin;
-}
-
-.no-args {
-  .mixin();
-}
-
-.var-args {
-  @var: 9;
-  .mixin(@var, (@var * 2));
-}
-
-.multi-mix {
-  .mixin(2px, 30%);
-  .mixiny(4, 5);
-}
-
-.maxa(@arg1: 10, @arg2: #f00) {
-  padding: (@arg1 * 2px);
-  color: @arg2;
-}
-
-body {
-  .maxa(15);
-}
-
-@glob: 5;
-.global-mixin(@a:2) {
-  width: (@glob + @a);
-}
-
-.scope-mix {
-  .global-mixin(3);
-}
-
-.nested-ruleset (@width: 200px) {
-    width: @width;
-    .column { margin: @width; }
-}
-.content {
-    .nested-ruleset(600px);
-}
-
-//
-
-.same-var-name2(@radius) {
-  radius: @radius;
-}
-.same-var-name(@radius) {
-  .same-var-name2(@radius);
-}
-#same-var-name {
-  .same-var-name(5px);
-}
-
-//
-
-.var-inside () {
-    @var: 10px;
-    width: @var;
-}
-#var-inside { .var-inside; }
-
-.mixin-arguments (@width: 0px, ...) {
-    border: @arguments;
-    width: @width;
-}
-
-.arguments {
-    .mixin-arguments(1px, solid, black);
-}
-.arguments2 {
-    .mixin-arguments();
-}
-.arguments3 {
-    .mixin-arguments;
-}
-
-.mixin-arguments2 (@width, @rest...) {
-    border: @arguments;
-    rest: @rest;
-    width: @width;
-}
-.arguments4 {
-    .mixin-arguments2(0, 1, 2, 3, 4);
-}
-
-// Edge cases
-
-.edge-case {
-    .mixin-arguments("{");
-}
-
-// Division vs. Literal Slash
-.border-radius(@r: 2px/5px) {
-  border-radius: @r;
-}
-.slash-vs-math {
-  .border-radius();
-  .border-radius(5px/10px);
-  .border-radius((3px * 2));
-}
-// semi-colon vs comma for delimiting
-
-.mixin-takes-one(@a) {
-    one: @a;
-}
-
-.mixin-takes-two(@a; @b) {
-    one: @a;
-    two: @b;
-}
-
-.comma-vs-semi-colon {
-    .mixin-takes-two(@a : a; @b : b, c);
-    .mixin-takes-two(@a : d, e; @b : f);
-    .mixin-takes-one(@a: g);
-    .mixin-takes-one(@a : h;);
-    .mixin-takes-one(i);
-    .mixin-takes-one(j;);
-    .mixin-takes-two(k, l);
-    .mixin-takes-one(m, n;);
-    .mixin-takes-two(o, p; q);
-    .mixin-takes-two(r, s; t;);
-}
-
-.mixin-conflict(@a:defA, @b:defB, @c:defC) {
-  three: @a, @b, @c;
-}
-
-.mixin-conflict(@a:defA, @b:defB, @c:defC, @d:defD) {
-  four: @a, @b, @c, @d;
-}
-
-#named-conflict {
-  .mixin-conflict(11, 12, 13, @a:a);
-  .mixin-conflict(@a:a, 21, 22, 23);
-}
-@a: 3px;
-.mixin-default-arg(@a: 1px, @b: @a, @c: @b) {
-  defaults: 1px 1px 1px;
-  defaults: 2px 2px 2px;
-}
-
-.test-mixin-default-arg {
-  .mixin-default-arg();
-  .mixin-default-arg(2px);
-}
-
-.mixin-comma-default1(@color; @padding; @margin: 2, 2, 2, 2) {
-  margin: @margin;
-}
-.selector {
-  .mixin-comma-default1(#33acfe; 4);
-}
-.mixin-comma-default2(@margin: 2, 2, 2, 2;) {
-  margin: @margin;
-}
-.selector2 {
-  .mixin-comma-default2();
-}
-.mixin-comma-default3(@margin: 2, 2, 2, 2) {
-  margin: @margin;
-}
-.selector3 {
-  .mixin-comma-default3(4,2,2,2);
-}
-
-.test-calling-one-arg-mixin(@a) {
-}
-
-.test-calling-one-arg-mixin(@a, @b, @rest...) {
-}
-
-div {
-  .test-calling-one-arg-mixin(1);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-closure.less b/test/Fixtures/lessjs (1.6)/less/mixins-closure.less
deleted file mode 100644
index 01251d2a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-closure.less	
+++ /dev/null
@@ -1,26 +0,0 @@
-.scope {
-    @var: 99px;
-    .mixin () {
-        width: @var;
-    }
-}
-
-.class {
-    .scope > .mixin;
-}
-
-.overwrite {
-    @var: 0px;
-    .scope > .mixin;
-}
-
-.nested {
-    @var: 5px;
-    .mixin () {
-        width: @var;    
-    }
-    .class {
-        @var: 10px;    
-       .mixin; 
-    }    
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-guards-default-func.less b/test/Fixtures/lessjs (1.6)/less/mixins-guards-default-func.less
deleted file mode 100644
index eada9381..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-guards-default-func.less	
+++ /dev/null
@@ -1,195 +0,0 @@
-
-// basics:
-
-guard-default-basic-1 {
-    .m(1)                   {case:     1}
-    .m(@x) when (default()) {default: @x}
-
-    &-1 {.m(1)}
-    &-2 {.m(2)}
-}
-
-guard-default-basic-2 {
-    .m(1)                   {case:     1}
-    .m(2)                   {case:     2}
-    .m(3)                   {case:     3}
-    .m(@x) when (default()) {default: @x}
-
-    &-0 {.m(0)}
-    &-2 {.m(2)}
-}
-
-guard-default-basic-3 {
-    .m(@x) when (@x = 1)    {case:     1}
-    .m(2)                   {case:     2}
-    .m(@x) when (@x = 3)    {case:     3}
-    .m(@x) when (default()) {default: @x}
-
-    &-0 {.m(0)}
-    &-2 {.m(2)}
-    &-3 {.m(3)}
-}
-
-guard-default-definition-order {
-    .m(@x) when (default()) {default: @x}
-    .m(@x) when (@x = 1)    {case:     1}
-    .m(2)                   {case:     2}
-    .m(@x) when (@x = 3)    {case:     3}
-
-    &-0 {.m(0)}
-    &-2 {.m(2)}
-    &-2 {.m(3)}
-}
-
-// out of guard:
-
-guard-default-out-of-guard {
-    .m(1)                              {case-1:   1}
-    .m(@x: default()) when (default()) {default: @x}
-    
-    &-0 {
-        case-0: default();
-        .m(1);
-        .m(2);
-        case-2: default();
-    }
-    &-1 {.m(default())}
-    &-2 {.m()}
-}
-
-// expressions:
-
-guard-default-expr-not {
-    .m(1)                      {case:     1}
-    .m(@x) when not(default()) {default: @x}
-
-    &-1 {.m(1)}
-    &-2 {.m(2)}
-}
-
-guard-default-expr-eq {
-    .m(@x) when (@x = true)      {case:    @x}
-    .m(@x) when (@x = false)     {case:    @x}
-    .m(@x) when (@x = default()) {default: @x}
-
-    &-true  {.m(true)}
-    &-false {.m(false)}
-}
-
-guard-default-expr-or {
-    .m(1)                             {case:     1}
-    .m(2)                             {case:     2}
-    .m(@x) when (default()), (@x = 2) {default: @x}
-
-    &-1 {.m(1)}
-    &-2 {.m(2)}
-    &-3 {.m(3)}
-}
-
-guard-default-expr-and {
-    .m(1)                                {case:     1}
-    .m(2)                                {case:     2}
-    .m(@x) when (default()) and (@x = 3) {default: @x}
-
-    &-1 {.m(1)}
-    &-2 {.m(2)}
-    &-3 {.m(3)}
-    &-4 {.m(4)}
-}
-
-guard-default-expr-always {
-    .m(1)                                   {case:     1}
-    .m(@x) when (default()), not(default()) {default: @x} // always match
-
-    &-1 {.m(1)}
-    &-2 {.m(2)}
-}
-
-guard-default-expr-never {
-    .m(1)                                      {case:     1}
-    .m(@x) when (default()) and not(default()) {default: @x} // never match
-
-    &-1 {.m(1)}
-    &-2 {.m(2)}
-}
-
-
-// not conflicting multiple default() uses:
-
-guard-default-multi-1 {
-    .m(0)                   {case:       0}
-    .m(@x) when (default()) {default-1: @x}
-    .m(2)  when (default()) {default-2: @x}
-
-    &-0 {.m(0)}
-    &-1 {.m(1)}
-}
-
-guard-default-multi-2 {
-    .m(1, @x)   when (default()) {default-1: @x}
-    .m(2, @x)   when (default()) {default-2: @x}
-    .m(@x, yes) when (default()) {default-3: @x}
-
-    &-1 {.m(1, no)}
-    &-2 {.m(2, no)}
-    &-3 {.m(3, yes)}
-}
-
-guard-default-multi-3 {
-    .m(red)                                    {case-1: darkred}
-    .m(blue)                                   {case-2: darkblue}
-    .m(@x) when (iscolor(@x)) and (default())  {default-color: @x}
-    .m('foo')                                  {case-1: I am 'foo'}
-    .m('bar')                                  {case-2: I am 'bar'}
-    .m(@x) when (isstring(@x)) and (default()) {default-string: I am @x}
-
-    &-blue  {.m(blue)}
-    &-green {.m(green)}
-    &-foo   {.m('foo')}
-    &-baz   {.m('baz')}
-}
-
-guard-default-multi-4 {
-    .m(@x) when (default()), not(default())    {always: @x}
-    .m(@x) when (default()) and not(default()) {never:  @x}
-    .m(2)                                      {case:    2}
-    
-    .m(1);
-    .m(2);
-}
-
-guard-default-not-ambiguos-2 {
-    .m(@x)                     {case:         1}
-    .m(@x) when (default())    {default:     @x}
-    .m(@x) when not(default()) {not-default: @x}
-
-    .m(2);
-}
-
-guard-default-not-ambiguos-3 {
-    .m(@x)                     {case:           1}
-    .m(@x) when not(default()) {not-default-1: @x}
-    .m(@x) when not(default()) {not-default-2: @x}
-
-    .m(2);
-}
-
-// default & scope
-
-guard-default-scopes {
-    .s1() {.m(@v)                  {1: no condition}}
-    .s2() {.m(@v) when (@v)        {2: when true}}
-    .s3() {.m(@v) when (default()) {3: when default}}
-
-    &-3 {
-        .s2();
-        .s3();
-        .m(false);
-    }
-    
-    &-1 {
-        .s1();
-        .s3();
-        .m(false);
-    }
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-guards.less b/test/Fixtures/lessjs (1.6)/less/mixins-guards.less
deleted file mode 100644
index 4d0774df..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-guards.less	
+++ /dev/null
@@ -1,153 +0,0 @@
-
-// Stacking, functions..
-
-.light (@a) when (lightness(@a) > 50%) {
-  color: white;
-}
-.light (@a) when (lightness(@a) < 50%) {
-  color: black;
-}
-.light (@a) {
-  margin: 1px;
-}
-
-.light1 { .light(#ddd) }
-.light2 { .light(#444) }
-
-// Arguments against each other
-
-.max (@a, @b) when (@a > @b) {
-  width: @a;
-}
-.max (@a, @b) when (@a < @b) {
-  width: @b;
-}
-
-.max1 { .max(3, 6) }
-.max2 { .max(8, 1) }
-
-// Globals inside guards
-
-@g: auto;
-
-.glob (@a) when (@a = @g) {
-  margin: @a @g;
-}
-.glob1 { .glob(auto) }
-
-// Other operators
-
-.ops (@a) when (@a >= 0) {
-  height: gt-or-eq;
-}
-.ops (@a) when (@a =< 0) {
-  height: lt-or-eq;
-}
-.ops (@a) when (@a <= 0) {
-  height: lt-or-eq-alias;
-}
-.ops (@a) when not(@a = 0) {
-  height: not-eq;
-}
-.ops1 { .ops(0) }
-.ops2 { .ops(1) }
-.ops3 { .ops(-1) }
-
-// Scope and default values
-
-@a: auto;
-
-.default (@a: inherit) when (@a = inherit) {
-  content: default;
-}
-.default1 { .default }
-
-// true & false keywords
-.test (@a) when (@a) {
-    content: "true.";
-}
-.test (@a) when not (@a) {
-    content: "false.";
-}
-
-.test1 { .test(true) }
-.test2 { .test(false) }
-.test3 { .test(1) }
-.test4 { .test(boo) }
-.test5 { .test("true") }
-
-// Boolean expressions
-
-.bool () when (true) and (false)                             { content: true and false } // FALSE
-.bool () when (true) and (true)                              { content: true and true } // TRUE
-.bool () when (true)                                         { content: true } // TRUE
-.bool () when (false) and (false)                            { content: true } // FALSE
-.bool () when (false), (true)                                { content: false, true } // TRUE
-.bool () when (false) and (true) and (true),  (true)         { content: false and true and true, true } // TRUE
-.bool () when (true)  and (true) and (false), (false)        { content: true and true and false, false } // FALSE
-.bool () when (false), (true) and (true)                     { content: false, true and true } // TRUE
-.bool () when (false), (false), (true)                       { content: false, false, true } // TRUE
-.bool () when (false), (false) and (true), (false)           { content: false, false and true, false } // FALSE
-.bool () when (false), (true) and (true) and (true), (false) { content: false, true and true and true, false } // TRUE
-.bool () when not (false)                                    { content: not false }
-.bool () when not (true) and not (false)                     { content: not true and not false }
-.bool () when not (true) and not (true)                      { content: not true and not true }
-.bool () when not (false) and (false), not (false)           { content: not false and false, not false }
-
-.bool1 { .bool }
-
-.equality-unit-test(@num) when (@num = 1%) {
-  test: fail;
-}
-.equality-unit-test(@num) when (@num = 2) {
-  test: pass;
-}
-.equality-units {
-  .equality-unit-test(1px);
-  .equality-unit-test(2px);
-}
-
-.colorguard(@col) when (@col = red)							{ content: is @col; }
-.colorguard(@col) when not (blue = @col)					{ content: is not blue its @col; }
-.colorguard(@col)											{}
-.colorguardtest {
-    .colorguard(red);
-	.colorguard(blue);
-	.colorguard(purple);
-}
-
-.stringguard(@str) when (@str = "theme1")					{ content: is theme1; }
-.stringguard(@str) when not ("theme2" = @str)				{ content: is not theme2; }
-.stringguard(@str) when (~"theme1" = @str)					{ content: is theme1 no quotes; }
-.stringguard(@str)											{}
-.stringguardtest {
-    .stringguard("theme1");
-	.stringguard("theme2");
-	.stringguard(theme1);
-}
-
-.mixin(...) {
-  catch:all;
-}
-.mixin(@var) when (@var=4) {
-  declare: 4;
-}
-.mixin(@var) when (@var=4px) {
-  declare: 4px;
-}
-#tryNumberPx {
-  .mixin(4px);
-}
-
-.lock-mixin(@a) {
- .inner-locked-mixin(@x: @a) when (@a = 1) {
-    a: @a;
-    x: @x;
-  }
-}
-.call-lock-mixin {
-  .lock-mixin(1);
-  .call-inner-lock-mixin {
-    .inner-locked-mixin();
-  }
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-important.less b/test/Fixtures/lessjs (1.6)/less/mixins-important.less
deleted file mode 100644
index c8cc1d5c..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-important.less	
+++ /dev/null
@@ -1,25 +0,0 @@
-.submixin(@a) {
-  border-width: @a;
-}
-.mixin (9) {
-  border: 9 !important;  
-}
-.mixin (@a: 0) {
-  border: @a;
-  boxer: @a;
-  .inner {
-    test: @a;
-  }
-  // comment
-  .submixin(@a);
-}
-
-.class {
-  .mixin(1);
-  .mixin(2) !important;
-  .mixin(3);
-  .mixin(4) !important;
-  .mixin(5);
-  .mixin !important;
-  .mixin(9);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-interpolated.less b/test/Fixtures/lessjs (1.6)/less/mixins-interpolated.less
deleted file mode 100644
index 2e75e980..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-interpolated.less	
+++ /dev/null
@@ -1,69 +0,0 @@
-
-@a1: foo;
-@a2: ~".foo";
-@a4: ~"#foo";
-
-.@{a1} {
-    a: 1;
-}
-
-@{a2} {
-    a: 2;
-}
-
-#@{a1} {
-    a: 3;
-}
-
-@{a4} {
-    a: 4;
-}
-
-mi-test-a {
-    .foo;
-    #foo;
-}
-
-.b .bb {
-    &.@{a1}-xxx .yyy-@{a1}@{a4} {
-        & @{a2}.bbb {
-            b: 1;
-        }
-    }
-}
-
-mi-test-b {
-    .b.bb.foo-xxx.yyy-foo#foo.foo.bbb;
-}
-
-@c1: @a1;
-@c2: bar;
-@c3: baz;
-
-#@{c1}-foo {
-    > .@{c2} {
-        .@{c3} {
-            c: c;
-        }
-    }
-}
-
-mi-test-c {
-    &-1 {#foo-foo;}
-    &-2 {#foo-foo > .bar;}
-    &-3 {#foo-foo > .bar.baz;}
-}
-
-.Person(@name, @gender_) {
-    .@{name} {
-        @gender: @gender_;
-        .sayGender() {
-            gender: @gender;
-        }
-    }
-}
-
-mi-test-d {
-    .Person(person, "Male");
-    .person.sayGender();
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-named-args.less b/test/Fixtures/lessjs (1.6)/less/mixins-named-args.less
deleted file mode 100644
index d79e0f47..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-named-args.less	
+++ /dev/null
@@ -1,36 +0,0 @@
-.mixin (@a: 1px, @b: 50%) {
-  width: (@a * 5);
-  height: (@b - 1%);
-  args: @arguments;
-}
-.mixin (@a: 1px, @b: 50%) when (@b > 75%){
-  text-align: center;
-}
- 
-.named-arg {
-  color: blue;
-  .mixin(@b: 100%);
-}
- 
-.class {
-  @var: 20%;
-  .mixin(@b: @var);
-}
-
-.all-args-wrong-args {
-  .mixin(@b: 10%, @a: 2px);
-}
-
-.mixin2 (@a: 1px, @b: 50%, @c: 50) {
-  width: (@a * 5);
-  height: (@b - 1%);
-  color: (#000000 + @c);
-}
-
-.named-args2 {
-  .mixin2(3px, @c: 100);
-}
-
-.named-args3 {
-  .mixin2(@b: 30%, @c: #123456);
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-nested.less b/test/Fixtures/lessjs (1.6)/less/mixins-nested.less
deleted file mode 100644
index 43443de2..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-nested.less	
+++ /dev/null
@@ -1,22 +0,0 @@
-.mix-inner (@var) {
-  border-width: @var;
-}
-
-.mix (@a: 10) {
-  .inner {
-    height: (@a * 10);
-
-    .innest {
-      width: @a;  
-      .mix-inner((@a * 2));
-    }  
-  }
-}
-
-.class {
-  .mix(30);
-}
-
-.class2 {
-  .mix(60);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins-pattern.less b/test/Fixtures/lessjs (1.6)/less/mixins-pattern.less
deleted file mode 100644
index f6a12ece..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins-pattern.less	
+++ /dev/null
@@ -1,99 +0,0 @@
-.mixin (...) {
-  variadic: true;
-}
-.mixin () {
-    zero: 0;
-}
-.mixin (@a: 1px) {
-    one: 1;
-}
-.mixin (@a) {
-    one-req: 1;
-}
-.mixin (@a: 1px, @b: 2px) {
-    two: 2;
-}
-
-.mixin (@a, @b, @c) {
-    three-req: 3;
-}
-
-.mixin (@a: 1px, @b: 2px, @c: 3px) {
-    three: 3;
-}
-
-.zero {
-    .mixin();
-}
-
-.one {
-    .mixin(1);
-}
-
-.two {
-    .mixin(1, 2);
-}
-
-.three {
-    .mixin(1, 2, 3);
-}
-
-//
-
-.mixout ('left') {
-    left: 1;
-}
-
-.mixout ('right') {
-    right: 1;
-}
-
-.left {
-    .mixout('left');
-}
-.right {
-    .mixout('right');
-}
-
-//
-
-.border (@side, @width) {
-    color: black;
-    .border-side(@side, @width);
-}
-.border-side (left, @w) {
-    border-left: @w;
-}
-.border-side (right, @w) {
-    border-right: @w;
-}
-
-.border-right {
-    .border(right, 4px);
-}
-.border-left {
-    .border(left, 4px);
-}
-
-//
-
-
-.border-radius (@r) {
-    both: (@r * 10);
-}
-.border-radius (@r, left) {
-    left: @r;
-}
-.border-radius (@r, right) {
-    right: @r;
-}
-
-.only-right {
-    .border-radius(33, right);
-}
-.only-left {
-    .border-radius(33, left);
-}
-.left-right {
-    .border-radius(33);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/mixins.less b/test/Fixtures/lessjs (1.6)/less/mixins.less
deleted file mode 100644
index be9e2bbd..00000000
--- a/test/Fixtures/lessjs (1.6)/less/mixins.less	
+++ /dev/null
@@ -1,141 +0,0 @@
-.mixin { border: 1px solid black; }
-.mixout { border-color: orange; }
-.borders { border-style: dashed; }
-
-#namespace {
-  .borders {
-    border-style: dotted;
-  }
-  .biohazard {
-    content: "death";
-    .man {
-      color: transparent;
-    }
-  }
-}
-#theme {
-  > .mixin {
-    background-color: grey;
-  }
-}
-#container {
-  color: black;
-  .mixin;
-  .mixout;
-  #theme > .mixin;
-}
-
-#header {
-  .milk {
-    color: white;
-    .mixin;
-    #theme > .mixin;
-  }
-  #cookie {
-    .chips {
-      #namespace .borders;
-      .calories {
-        #container;
-      }
-    }
-    .borders;
-  }
-}
-.secure-zone { #namespace .biohazard .man; }
-.direct {
-  #namespace > .borders;
-}
-
-.bo, .bar {
-    width: 100%;
-}
-.bo {
-    border: 1px;
-}
-.ar.bo.ca {
-    color: black;
-}
-.jo.ki {
-    background: none;
-}
-.amp {
-    &.support {
-        color: orange;
-        .higher {
-            top: 0px;
-        }
-        &.deeper {
-            height: auto;
-        }
-    }
-}
-.extended {
-    .bo;
-    .jo.ki;
-    .amp.support;
-    .amp.support.higher;
-    .amp.support.deeper;
-}
-.do .re .mi .fa {
-    .sol .la {
-        .si {
-            color: cyan;
-        }
-    }
-}
-.mutli-selector-parents {
-    .do.re.mi.fa.sol.la.si;
-}
-.foo .bar {
-  .bar;
-}
-.has_parents() {
-  & .underParents {
-    color: red;
-  }
-}
-.has_parents();
-.parent {
-  .has_parents();
-}
-.margin_between(@above, @below) {
-     * + & { margin-top: @above; }
-     legend + & { margin-top: 0; }
-     & + * { margin-top: @below; }
-}
-h1 { .margin_between(25px, 10px); }
-h2 { .margin_between(20px, 8px); }
-h3 { .margin_between(15px, 5px); }
-
-.mixin_def(@url, @position){
-    background-image: @url;
-    background-position: @position;
-}
-.error{
-  @s: "/";
-  .mixin_def( "@{s}a.png", center center);
-}
-.recursion() {
-  color: black;
-}
-.test-rec {
-  .recursion {
-    .recursion();
-  }
-}
-.paddingFloat(@padding) { padding-left: @padding; }
-
-.button { 
-    .paddingFloat(((10px + 12) * 2));
-
-    &.large { .paddingFloat(((10em * 2) * 2)); }
-}
-.clearfix() {
-  // ...
-}
-.clearfix {
-  .clearfix();
-}
-.foo {
-  .clearfix();
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/modifyVars/extended.json b/test/Fixtures/lessjs (1.6)/less/modifyVars/extended.json
deleted file mode 100644
index 6bd2a484..00000000
--- a/test/Fixtures/lessjs (1.6)/less/modifyVars/extended.json	
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "the-border": "1px",
-    "base-color": "#111",
-    "red": "#842210"
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/modifyVars/extended.less b/test/Fixtures/lessjs (1.6)/less/modifyVars/extended.less
deleted file mode 100644
index 0badc671..00000000
--- a/test/Fixtures/lessjs (1.6)/less/modifyVars/extended.less	
+++ /dev/null
@@ -1,11 +0,0 @@
-#header {
-  color: (@base-color * 3);
-  border-left: @the-border;
-  border-right: (@the-border * 2);
-}
-#footer {
-  color: (@base-color + #003300);
-  border-color: @red;
-}
-@red: blue; // var is overridden by the modifyVars
-//@base-color: green;
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/no-js-errors/no-js-errors.less b/test/Fixtures/lessjs (1.6)/less/no-js-errors/no-js-errors.less
deleted file mode 100644
index 15ef8a45..00000000
--- a/test/Fixtures/lessjs (1.6)/less/no-js-errors/no-js-errors.less	
+++ /dev/null
@@ -1,3 +0,0 @@
-.a {
-  a: `1 + 1`;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/no-js-errors/no-js-errors.txt b/test/Fixtures/lessjs (1.6)/less/no-js-errors/no-js-errors.txt
deleted file mode 100644
index d81dd2bd..00000000
--- a/test/Fixtures/lessjs (1.6)/less/no-js-errors/no-js-errors.txt	
+++ /dev/null
@@ -1,4 +0,0 @@
-SyntaxError: You are using JavaScript, which has been disabled. in {path}no-js-errors.less on line 2, column 6:
-1 .a {
-2   a: `1 + 1`;
-3 }
diff --git a/test/Fixtures/lessjs (1.6)/less/no-output.less b/test/Fixtures/lessjs (1.6)/less/no-output.less
deleted file mode 100644
index b4e6a499..00000000
--- a/test/Fixtures/lessjs (1.6)/less/no-output.less	
+++ /dev/null
@@ -1,2 +0,0 @@
-.mixin() {
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/operations.less b/test/Fixtures/lessjs (1.6)/less/operations.less
deleted file mode 100644
index 3e483c8b..00000000
--- a/test/Fixtures/lessjs (1.6)/less/operations.less	
+++ /dev/null
@@ -1,62 +0,0 @@
-#operations {
-  color: (#110000 + #000011 + #001100); // #111111
-  height: (10px / 2px + 6px - 1px * 2); // 9px
-  width: (2 * 4 - 5em); // 3em
-  .spacing {
-    height: (10px / 2px+6px-1px*2);
-    width: (2  * 4-5em);
-  }
-  substraction: (20 - 10 - 5 - 5); // 0
-  division: (20 / 5 / 4); // 1
-}
-
-@x: 4;
-@y: 12em;
-
-.with-variables {
-  height: (@x + @y); // 16em
-  width: (12 + @y); // 24em
-  size: (5cm - @x); // 1cm
-}
-
-.with-functions {
-  color: (rgb(200, 200, 200) / 2);
-  color: (2 * hsl(0, 50%, 50%));
-  color: (rgb(10, 10, 10) + hsl(0, 50%, 50%));
-}
-
-@z: -2;
-
-.negative {
-  height: (2px + @z); // 0px
-  width: (2px - @z); // 4px
-}
-
-.shorthands {
-  padding: -1px 2px 0 -4px; //
-}
-
-.rem-dimensions {
-  font-size: (20rem / 5 + 1.5rem); // 5.5rem
-}
-
-.colors {
-  color: #123; // #112233
-  border-color: (#234 + #111111); // #334455
-  background-color: (#222222 - #fff); // #000000
-  .other {
-    color: (2 * #111); // #222222
-    border-color: (#333333 / 3 + #111); // #222222
-  }
-}
-
-.negations {
-    @var: 4px;
-    variable: (-@var); // 4
-    variable1: (-@var + @var); // 0
-    variable2: (@var + -@var); // 0
-    variable3: (@var - -@var); // 8
-    variable4: (-@var - -@var); // 0
-    paren: (-(@var)); // -4px
-    paren2: (-(2 + 2) * -@var); // 16
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/parens.less b/test/Fixtures/lessjs (1.6)/less/parens.less
deleted file mode 100644
index eeef3448..00000000
--- a/test/Fixtures/lessjs (1.6)/less/parens.less	
+++ /dev/null
@@ -1,45 +0,0 @@
-.parens {
-  @var: 1px;
-  border: (@var * 2) solid black;
-  margin: (@var * 1) (@var + 2) (4 * 4) 3;
-  width: (6 * 6);
-  padding: 2px (6 * 6px);
-}
-
-.more-parens {
-  @var: (2 * 2);
-  padding: (2 * @var) 4 4 (@var * 1px);
-  width-all: ((@var * @var) * 6);
-  width-first: ((@var * @var)) * 6;
-  width-keep: (@var * @var) * 6;
-  height-keep: (7 * 7) + (8 * 8);
-  height-all: ((7 * 7) + (8 * 8));
-  height-parts: ((7 * 7)) + ((8 * 8));
-  margin-keep: (4 * (5 + 5) / 2) - (@var * 2);
-  margin-parts: ((4 * (5 + 5) / 2)) - ((@var * 2));
-  margin-all: ((4 * (5 + 5) / 2) + (-(@var * 2)));
-  border-radius-keep: 4px * (1 + 1) / @var + 3px;
-  border-radius-parts: ((4px * (1 + 1))) / ((@var + 3px));
-  border-radius-all: (4px * (1 + 1) / @var + 3px);
-  //margin: (6 * 6)px;
-}
-
-.negative {
-  @var: 1;
-  neg-var: -@var; // -1 ?
-  neg-var-paren: -(@var); // -(1) ?
-}
-
-.nested-parens {
-  width: 2 * (4 * (2 + (1 + 6))) - 1;
-  height: ((2 + 3) * (2 + 3) / (9 - 4)) + 1;
-}
-
-.mixed-units {
-  margin: 2px 4em 1 5pc;
-  padding: (2px + 4px) 1em 2px 2;
-}
-
-.test-false-negatives {
-  a: ~"(";
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/property-name-interp.less b/test/Fixtures/lessjs (1.6)/less/property-name-interp.less
deleted file mode 100644
index 9886e65f..00000000
--- a/test/Fixtures/lessjs (1.6)/less/property-name-interp.less	
+++ /dev/null
@@ -1,53 +0,0 @@
-
-pi-test {
-    @prefix: ufo-;
-    @a:    border;
-    @bb:      top;
-    @c_c:    left;
-    @d-d4: radius;
-    @-:         -;
-    
-    @{a}: 0;
-    @{prefix}width: 50%;
-    *-z-@{a} :1px dashed blue;
-    -www-@{a}-@{bb}: 2px;
-    @{d-d4}-is-not-a-@{a}:true;
-    @{a}-@{bb}-@{c_c}-@{d-d4}       : 2em;
-    @{a}@{-}@{bb}@{-}red@{-}@{d-d4}-: 3pt;
-
-    .mixin(mixer);
-    .merge(ish, base);
-}
-
-@global: global;
-
-.mixin(@arg) {
-    @local: local;
-    @{global}-@{local}-@{arg}-property: strong;
-}
-
-.merge(@p, @v) {
-    &-merge {
-        @prefix: pre;
-        @suffix: ish;
-        @{prefix}-property-ish+       :high;
-        pre-property-@{suffix}    +: middle;
-        @{prefix}-property-@{suffix}+:  low;
-        @{prefix}-property-@{p}   +  :   @v;
-    
-        @subterfuge: ~'+';
-        pre-property-ish@{subterfuge}: nice try dude;
-    }
-}
-
-pi-indirect-vars {
-    @{p}: @p;
-    @p: @@a;
-    @a: b;
-    @b: auto;
-}
-
-pi-complex-values {
-    @{p}@{p}: none;
-    @p: (1 + 2px) fadeout(#ff0, 50%), pi() /* foo */;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/rulesets.less b/test/Fixtures/lessjs (1.6)/less/rulesets.less
deleted file mode 100644
index e81192db..00000000
--- a/test/Fixtures/lessjs (1.6)/less/rulesets.less	
+++ /dev/null
@@ -1,30 +0,0 @@
-#first > .one {
-  > #second .two > #deux {
-    width: 50%;
-    #third {
-      &:focus {
-        color: black;
-        #fifth {
-          > #sixth {
-            .seventh #eighth {
-              + #ninth {
-                color: purple;
-              }
-            }
-          }
-        }
-      }
-      height: 100%;
-    }
-    #fourth, #five, #six {
-      color: #110000;
-      .seven, .eight > #nine {
-        border: 1px solid black;
-      }
-      #ten {
-        color: red;
-      }
-    }
-  }
-  font-size: 2em;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/scope.less b/test/Fixtures/lessjs (1.6)/less/scope.less
deleted file mode 100644
index 36d37061..00000000
--- a/test/Fixtures/lessjs (1.6)/less/scope.less	
+++ /dev/null
@@ -1,79 +0,0 @@
-@x: red;
-@x: blue;
-@z: transparent;
-@mix: none;
-
-.mixin {
-  @mix: #989;
-}
-@mix: blue;
-.tiny-scope {
-  color: @mix; // #989
-  .mixin;
-}
-
-.scope1 {
-  @y: orange;
-  @z: black;
-  color: @x; // blue
-  border-color: @z; // black
-  .hidden {
-    @x: #131313;
-  }
-  .scope2 {
-    @y: red;
-    color: @x; // blue
-    .scope3 {
-      @local: white;
-      color: @y; // red
-      border-color: @z; // black
-      background-color: @local; // white
-    }
-  }
-}
-
-#namespace {
-  .scoped_mixin() {
-    @local-will-be-made-global: green;
-    .scope {
-      scoped-val: @local-will-be-made-global;
-	}
-  }
-}
-
-#namespace > .scoped_mixin();
-
-.setHeight(@h) { @height: 1024px; }
-.useHeightInMixinCall(@h) { .useHeightInMixinCall { mixin-height: @h; } }
-@mainHeight: 50%;
-.setHeight(@mainHeight);
-.heightIsSet { height: @height; }
-.useHeightInMixinCall(@height);
-
-.importRuleset() {
-  .imported {
-    exists: true;
-  }
-}
-.importRuleset();
-.testImported {
-  .imported;
-}
-
-@parameterDefault: 'top level';
-@anotherVariable: 'top level';
-//mixin uses top-level variables
-.mixinNoParam(@parameter: @parameterDefault) when (@parameter = 'top level') {
-  default: @parameter;
-  scope: @anotherVariable;
-  sub-scope-only: @subScopeOnly;
-}
-
-#allAreUsedHere {
-  //redefine top-level variables in different scope
-  @parameterDefault: 'inside';
-  @anotherVariable: 'inside';
-  @subScopeOnly: 'inside';
-  //use the mixin
-  .mixinNoParam();
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/selectors.less b/test/Fixtures/lessjs (1.6)/less/selectors.less
deleted file mode 100644
index 8b30546f..00000000
--- a/test/Fixtures/lessjs (1.6)/less/selectors.less	
+++ /dev/null
@@ -1,156 +0,0 @@
-h1, h2, h3 {
-  a, p {
-    &:hover {
-      color: red;
-    }
-  }
-}
-
-#all { color: blue; }
-#the { color: blue; }
-#same { color: blue; }
-
-ul, li, div, q, blockquote, textarea {
-  margin: 0;
-}
-
-td {
-  margin: 0;
-  padding: 0;
-}
-
-td, input {
-  line-height: 1em;
-}
-
-a {
-  color: red;
-
-  &:hover { color: blue; }
-
-  div & { color: green; }
-
-  p & span { color: yellow; }
-}
-
-.foo {
-  .bar, .baz {
-    & .qux {
-      display: block;
-    }
-    .qux & {
-      display: inline;
-    }
-	.qux& {
-	  display: inline-block;
-	}
-    .qux & .biz {
-      display: none;
-    }
-  }
-}
-
-.b {
- &.c {
-  .a& {
-   color: red;
-  }
- }
-}
-
-.b {
- .c & {
-  &.a {
-   color: red;
-  }
- }
-}
-
-.p {
-  .foo &.bar {
-    color: red;
-  }
-}
-
-.p {
-  .foo&.bar {
-    color: red;
-  }
-}
-
-.foo {
-  .foo + & {
-    background: amber;
-  }
-  & + & {
-    background: amber;
-  }
-}
-
-.foo, .bar {
-  & + & {
-    background: amber;
-  }
-}
-
-.foo, .bar {
-  a, b {
-    & > & {
-      background: amber;
-    }
-  }
-}
-
-.other ::fnord { color: red }
-.other::fnord { color: red }
-.other {
-  ::bnord {color: red }
-  &::bnord {color: red }
-}
-// selector interpolation
-@theme: blood;
-@selector: ~".@{theme}";
-@{selector} {
-  color:red;
-}
-@{selector}red {
-  color: green;
-}
-.red {
-  #@{theme}.@{theme}&.black {
-    color:black;
-  }
-}
-@num: 3;
-:nth-child(@{num}) {
-	selector: interpolated;
-}
-.test {
-  &:nth-child(odd):not(:nth-child(3)) {
-    color: #ff0000;
-  }
-}
-[prop],
-[prop=10%],
-[prop="value@{num}"],
-[prop*="val@{num}"],
-[|prop~="val@{num}"],
-[*|prop$="val@{num}"],
-[ns|prop^="val@{num}"],
-[@{num}^="val@{num}"],
-[@{num}=@{num}],
-[@{num}] {
-  attributes: yes;
-}
-
-/*
-Large comment means chunk will be emitted after } which means chunk will begin with whitespace...
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank blank
-*/
-@{selector} {
-  color: red;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/sourcemaps/basic.json b/test/Fixtures/lessjs (1.6)/less/sourcemaps/basic.json
deleted file mode 100644
index 76a63c5a..00000000
--- a/test/Fixtures/lessjs (1.6)/less/sourcemaps/basic.json	
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-	"my-color": "red"
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/sourcemaps/basic.less b/test/Fixtures/lessjs (1.6)/less/sourcemaps/basic.less
deleted file mode 100644
index 4ee8b4f6..00000000
--- a/test/Fixtures/lessjs (1.6)/less/sourcemaps/basic.less	
+++ /dev/null
@@ -1,27 +0,0 @@
-@var: black;
-
-.a() {
-  color: red;
-}
-
-.b {
-  color: green;
-  .a();
-  color: blue;
-  background: @var;
-}
-
-.a, .b {
-  background: green;
-  .c, .d {
-    background: gray;
-    & + & {
-      color: red;
-    }
-  }
-}
-
-.extend:extend(.a all) {
-  color: pink;
-}
-@import (inline) "imported.css";
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/sourcemaps/imported.css b/test/Fixtures/lessjs (1.6)/less/sourcemaps/imported.css
deleted file mode 100644
index 2ee35f06..00000000
--- a/test/Fixtures/lessjs (1.6)/less/sourcemaps/imported.css	
+++ /dev/null
@@ -1,7 +0,0 @@
-/*comments*/
-.unused-css {
-    color: white;
-}
-.imported {
-    color: black;
-}
\ No newline at end of file
diff --git a/test/Fixtures/lessjs (1.6)/less/static-urls/urls.less b/test/Fixtures/lessjs (1.6)/less/static-urls/urls.less
deleted file mode 100644
index b0c7de09..00000000
--- a/test/Fixtures/lessjs (1.6)/less/static-urls/urls.less	
+++ /dev/null
@@ -1,33 +0,0 @@
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium),
-       url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-}
-
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-    @a: 'Trebuchet';
-    url: url(@a);
-}
-
-@import "../import/import-and-relative-paths-test";
diff --git a/test/Fixtures/lessjs (1.6)/less/strings.less b/test/Fixtures/lessjs (1.6)/less/strings.less
deleted file mode 100644
index c43e368d..00000000
--- a/test/Fixtures/lessjs (1.6)/less/strings.less	
+++ /dev/null
@@ -1,57 +0,0 @@
-#strings {
-  background-image: url("http://son-of-a-banana.com");
-  quotes: "~" "~";
-  content: "#*%:&^,)!.(~*})";
-  empty: "";
-  brackets: "{" "}";
-  escapes: "\"hello\" \\world";
-  escapes2: "\"llo";
-}
-#comments {
-  content: "/* hello */ // not-so-secret";
-}
-#single-quote {
-  quotes: "'" "'";
-  content: '""#!&""';
-  empty: '';
-  semi-colon: ';';
-}
-#escaped {
-  filter: ~"DX.Transform.MS.BS.filter(opacity=50)";
-}
-#one-line { image: url(http://tooks.com) }
-#crazy { image: url(http://), "}", url("http://}") }
-#interpolation {
-  @var: '/dev';
-  url: "http://lesscss.org@{var}/image.jpg";
-
-  @var2: 256;
-  url2: "http://lesscss.org/image-@{var2}.jpg";
-
-  @var3: #456;
-  url3: "http://lesscss.org@{var3}";
-
-  @var4: hello;
-  url4: "http://lesscss.org/@{var4}";
-
-  @var5: 54.4px;
-  url5: "http://lesscss.org/@{var5}";
-}
-
-// multiple calls with string interpolation
-
-.mix-mul (@a: green) {
-    color: ~"@{a}";
-}
-.mix-mul-class {
-    .mix-mul(blue);
-    .mix-mul(red);
-    .mix-mul(black);
-    .mix-mul(orange);
-}
-
-@test: Arial, Verdana, San-Serif;
-.watermark {
-  @family: ~"Univers, @{test}";
-  family: @family;
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/url-args/urls.less b/test/Fixtures/lessjs (1.6)/less/url-args/urls.less
deleted file mode 100644
index 2f1bd872..00000000
--- a/test/Fixtures/lessjs (1.6)/less/url-args/urls.less	
+++ /dev/null
@@ -1,63 +0,0 @@
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium),
-       url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-  background: url("img.jpg") center / 100px;
-  background: #fff url(image.png) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700");
-}
-
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-    @a: 'Trebuchet';
-    url: url(@a);
-}
-
-@import "../import/imports/font";
-
-#data-uri {
-  uri: data-uri('image/jpeg;base64', '../../data/image.jpg');
-}
-
-#data-uri-guess {
-  uri: data-uri('../../data/image.jpg');
-}
-
-#data-uri-ascii {
-  uri-1: data-uri('text/html', '../../data/page.html');
-  uri-2: data-uri('../../data/page.html');
-}
-
-#svg-functions {
-  background-image: svg-gradient(to bottom, black, white);
-  background-image: svg-gradient(to bottom, black, orange 3%, white);
-  @green_5: green 5%;
-  @orange_percentage: 3%;
-  @orange_color: orange;
-  background-image: svg-gradient(to bottom, (mix(black, white) + #444) 1%, @orange_color @orange_percentage, ((@green_5)), white 95%);
-}
-
-#data-uri-with-spaces {
-  background-image: url( data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url( ' data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==');
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/urls.less b/test/Fixtures/lessjs (1.6)/less/urls.less
deleted file mode 100644
index ca1602e2..00000000
--- a/test/Fixtures/lessjs (1.6)/less/urls.less	
+++ /dev/null
@@ -1,72 +0,0 @@
-@font-face {
-  src: url("/fonts/garamond-pro.ttf");
-  src: local(Futura-Medium),
-       url(fonts.svg#MyGeometricModern) format("svg");
-}
-#shorthands {
-  background: url("http://www.lesscss.org/spec.html") no-repeat 0 4px;
-  background: url("img.jpg") center / 100px;
-  background: #fff url(image.png) center / 1px 100px repeat-x scroll content-box padding-box;
-}
-#misc {
-  background-image: url(images/image.jpg);
-}
-#data-uri {
-  background: url(data:image/png;charset=utf-8;base64,
-    kiVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAABlBMVEUAAAD/
-    k//+l2Z/dAAAAM0lEQVR4nGP4/5/h/1+G/58ZDrAz3D/McH8yw83NDDeNGe4U
-    kg9C9zwz3gVLMDA/A6P9/AFGGFyjOXZtQAAAAAElFTkSuQmCC);
-  background-image: url(data:image/x-png,f9difSSFIIGFIFJD1f982FSDKAA9==);
-  background-image: url(http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700);
-  background-image: url("http://fonts.googleapis.com/css?family=\"Rokkitt\":\(400\),700");
-}
-
-#svg-data-uri {
-  background: transparent url('data:image/svg+xml, <svg version="1.1"><g></g></svg>');
-}
-
-.comma-delimited {
-  background: url(bg.jpg) no-repeat, url(bg.png) repeat-x top left, url(bg);
-}
-.values {
-    @a: 'Trebuchet';
-    url: url(@a);
-}
-
-@import "import/import-and-relative-paths-test";
-
-#relative-url-import {
-    .unquoted-relative-path-bg;
-    .quoted-relative-path-border-image;
-}
-
-#data-uri {
-  uri: data-uri('image/jpeg;base64', '../data/image.jpg');
-}
-
-#data-uri-guess {
-  uri: data-uri('../data/image.jpg');
-}
-
-#data-uri-ascii {
-  uri-1: data-uri('text/html', '../data/page.html');
-  uri-2: data-uri('../data/page.html');
-}
-
-#data-uri-toobig {
-  uri: data-uri('../data/data-uri-fail.png');
-}
-.add_an_import(@file_to_import) {
-@import "@{file_to_import}";
-}
-
-.add_an_import("file.css");
-
-#svg-functions {
-  background-image: svg-gradient(to bottom, black, white);
-  background-image: svg-gradient(to bottom, black, orange 3%, white);
-  @green_5: green 5%;
-  @orange_percentage: 3%;
-  @orange_color: orange;
-  background-image: svg-gradient(to bottom, (mix(black, white) + #444) 1%, @orange_color @orange_percentage, ((@green_5)), white 95%);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/variables.less b/test/Fixtures/lessjs (1.6)/less/variables.less
deleted file mode 100644
index e896f404..00000000
--- a/test/Fixtures/lessjs (1.6)/less/variables.less	
+++ /dev/null
@@ -1,83 +0,0 @@
-@a: 2;
-@x: (@a * @a);
-@y: (@x + 1);
-@z: (@x * 2 + @y);
-@var: -1;
-
-.variables {
-  width: (@z + 1cm); // 14cm
-}
-
-@b: @a * 10;
-@c: #888;
-
-@fonts: "Trebuchet MS", Verdana, sans-serif;
-@f: @fonts;
-
-@quotes: "~" "~";
-@q: @quotes;
-@onePixel: 1px;
-
-.variables {
-  height: (@b + @x + 0px); // 24px
-  color: @c;
-  font-family: @f;
-  quotes: @q;
-}
-
-.redef {
-    @var: 0;
-	.inition {
-		@var: 4;
-		@var: 2;
-		three: @var;
-		@var: 3;
-	}
-	zero: @var;
-}
-
-.values {
-	minus-one: @var;
-    @a: 'Trebuchet';
-    @multi: 'A', B, C;
-    font-family: @a, @a, @a;
-    color: @c !important;
-    multi: something @multi, @a;
-}
-
-.variable-names {
-    @var: 'hello';
-    @name: 'var';
-    name: @@name;
-}
-
-.alpha {
-    @var: 42;
-    filter: alpha(opacity=@var);
-}
-
-.polluteMixin() {
-    @a: 'pollution';
-}
-.testPollution {
-    @a: 'no-pollution';
-    a: @a;
-	.polluteMixin();
-	a: @a;
-}
-
-.units {
-  width: @onePixel;
-  same-unit-as-previously: (@onePixel / @onePixel);
-  square-pixel-divided: (@onePixel * @onePixel / @onePixel);
-  odd-unit: unit((@onePixel * 4em / 2cm));
-  percentage: (10 * 50%);
-  pixels: (50px * 10);
-  conversion-metric-a: (20mm + 1cm);
-  conversion-metric-b: (1cm + 20mm);
-  conversion-imperial: (1in + 72pt + 6pc);
-  custom-unit: (42octocats * 10);
-  custom-unit-cancelling: (8cats * 9dogs / 4cats);
-  mix-units: (1px + 1em);
-  invalid-units: (1px * 1px);
-}
diff --git a/test/Fixtures/lessjs (1.6)/less/whitespace.less b/test/Fixtures/lessjs (1.6)/less/whitespace.less
deleted file mode 100644
index ab4804da..00000000
--- a/test/Fixtures/lessjs (1.6)/less/whitespace.less	
+++ /dev/null
@@ -1,44 +0,0 @@
-
-
-.whitespace
-  { color: white; }  
-  
-.whitespace
-{
-  color: white;
-}
-  .whitespace
-{ color: white; }
-
-.whitespace{color:white;}  
-.whitespace { color : white ; }
-
-.white,
-.space,
-.mania
-{ color: white; }
-
-.no-semi-column { color: white }
-.no-semi-column {
-  color: white;
-  white-space: pre
-}
-.no-semi-column {border: 2px solid white}
-.newlines {
-  background: the,
-              great,
-              wall;
-  border: 2px
-          solid
-          black;
-}
-.empty {
-  
-}
-.sel
-.newline_ws	.tab_ws	{
-color:
-white;
-background-position: 45
--23;
-}
diff --git a/test/assets/less-1.6.3.js b/test/assets/less-1.6.3.js
deleted file mode 100644
index 1e3082bc..00000000
--- a/test/assets/less-1.6.3.js
+++ /dev/null
@@ -1,7640 +0,0 @@
-/*!
- * LESS - Leaner CSS v1.6.3
- * http://lesscss.org
- *
- * Copyright (c) 2009-2014, Alexis Sellier <self@cloudhead.net>
- * Licensed under the Apache v2 License.
- *
- */
-
- /** * @license Apache v2
- */
-
-
-
-(function (window, undefined) {//
-// Stub out `require` in the browser
-//
-function require(arg) {
-    return window.less[arg.split('/')[1]];
-};
-
-
-if (typeof(window.less) === 'undefined' || typeof(window.less.nodeType) !== 'undefined') { window.less = {}; }
-less = window.less;
-tree = window.less.tree = {};
-less.mode = 'browser';
-
-var less, tree;
-
-// Node.js does not have a header file added which defines less
-if (less === undefined) {
-    less = exports;
-    tree = require('./tree');
-    less.mode = 'node';
-}
-//
-// less.js - parser
-//
-//    A relatively straight-forward predictive parser.
-//    There is no tokenization/lexing stage, the input is parsed
-//    in one sweep.
-//
-//    To make the parser fast enough to run in the browser, several
-//    optimization had to be made:
-//
-//    - Matching and slicing on a huge input is often cause of slowdowns.
-//      The solution is to chunkify the input into smaller strings.
-//      The chunks are stored in the `chunks` var,
-//      `j` holds the current chunk index, and `currentPos` holds
-//      the index of the current chunk in relation to `input`.
-//      This gives us an almost 4x speed-up.
-//
-//    - In many cases, we don't need to match individual tokens;
-//      for example, if a value doesn't hold any variables, operations
-//      or dynamic references, the parser can effectively 'skip' it,
-//      treating it as a literal.
-//      An example would be '1px solid #000' - which evaluates to itself,
-//      we don't need to know what the individual components are.
-//      The drawback, of course is that you don't get the benefits of
-//      syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
-//      and a smaller speed-up in the code-gen.
-//
-//
-//    Token matching is done with the `$` function, which either takes
-//    a terminal string or regexp, or a non-terminal function to call.
-//    It also takes care of moving all the indices forwards.
-//
-//
-less.Parser = function Parser(env) {
-    var input,       // LeSS input string
-        i,           // current index in `input`
-        j,           // current chunk
-        temp,        // temporarily holds a chunk's state, for backtracking
-        memo,        // temporarily holds `i`, when backtracking
-        furthest,    // furthest index the parser has gone to
-        chunks,      // chunkified input
-        current,     // current chunk
-        currentPos,  // index of current chunk, in `input`
-        parser,
-        parsers,
-        rootFilename = env && env.filename;
-
-    // Top parser on an import tree must be sure there is one "env"
-    // which will then be passed around by reference.
-    if (!(env instanceof tree.parseEnv)) {
-        env = new tree.parseEnv(env);
-    }
-
-    var imports = this.imports = {
-        paths: env.paths || [],  // Search paths, when importing
-        queue: [],               // Files which haven't been imported yet
-        files: env.files,        // Holds the imported parse trees
-        contents: env.contents,  // Holds the imported file contents
-        contentsIgnoredChars: env.contentsIgnoredChars, // lines inserted, not in the original less
-        mime:  env.mime,         // MIME type of .less files
-        error: null,             // Error in parsing/evaluating an import
-        push: function (path, currentFileInfo, importOptions, callback) {
-            var parserImports = this;
-            this.queue.push(path);
-
-            var fileParsedFunc = function (e, root, fullPath) {
-                parserImports.queue.splice(parserImports.queue.indexOf(path), 1); // Remove the path from the queue
-
-                var importedPreviously = fullPath in parserImports.files || fullPath === rootFilename;
-
-                parserImports.files[fullPath] = root;                        // Store the root
-
-                if (e && !parserImports.error) { parserImports.error = e; }
-
-                callback(e, root, importedPreviously, fullPath);
-            };
-
-            if (less.Parser.importer) {
-                less.Parser.importer(path, currentFileInfo, fileParsedFunc, env);
-            } else {
-                less.Parser.fileLoader(path, currentFileInfo, function(e, contents, fullPath, newFileInfo) {
-                    if (e) {fileParsedFunc(e); return;}
-
-                    var newEnv = new tree.parseEnv(env);
-
-                    newEnv.currentFileInfo = newFileInfo;
-                    newEnv.processImports = false;
-                    newEnv.contents[fullPath] = contents;
-
-                    if (currentFileInfo.reference || importOptions.reference) {
-                        newFileInfo.reference = true;
-                    }
-
-                    if (importOptions.inline) {
-                        fileParsedFunc(null, contents, fullPath);
-                    } else {
-                        new(less.Parser)(newEnv).parse(contents, function (e, root) {
-                            fileParsedFunc(e, root, fullPath);
-                        });
-                    }
-                }, env);
-            }
-        }
-    };
-
-    function save()    { temp = current; memo = currentPos = i; }
-    function restore() { current = temp; currentPos = i = memo; }
-
-    function sync() {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-    }
-    function isWhitespace(str, pos) {
-        var code = str.charCodeAt(pos | 0);
-        return (code <= 32) && (code === 32 || code === 10 || code === 9);
-    }
-    //
-    // Parse from a token, regexp or string, and move forward if match
-    //
-    function $(tok) {
-        var tokType = typeof tok,
-            match, length;
-
-        // Either match a single character in the input,
-        // or match a regexp in the current chunk (`current`).
-        //
-        if (tokType === "string") {
-            if (input.charAt(i) !== tok) {
-                return null;
-            }
-            skipWhitespace(1);
-            return tok;
-        }
-
-        // regexp
-        sync ();
-        if (! (match = tok.exec(current))) {
-            return null;
-        }
-
-        length = match[0].length;
-
-        // The match is confirmed, add the match length to `i`,
-        // and consume any extra white-space characters (' ' || '\n')
-        // which come after that. The reason for this is that LeSS's
-        // grammar is mostly white-space insensitive.
-        //
-        skipWhitespace(length);
-
-        if(typeof(match) === 'string') {
-            return match;
-        } else {
-            return match.length === 1 ? match[0] : match;
-        }
-    }
-
-    // Specialization of $(tok)
-    function $re(tok) {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-        var m = tok.exec(current);
-        if (!m) {
-            return null;
-        }
-
-        skipWhitespace(m[0].length);
-        if(typeof m === "string") {
-            return m;
-        }
-
-        return m.length === 1 ? m[0] : m;
-    }
-
-    var _$re = $re;
-
-    // Specialization of $(tok)
-    function $char(tok) {
-        if (input.charAt(i) !== tok) {
-            return null;
-        }
-        skipWhitespace(1);
-        return tok;
-    }
-
-    function skipWhitespace(length) {
-        var oldi = i, oldj = j,
-            curr = i - currentPos,
-            endIndex = i + current.length - curr,
-            mem = (i += length),
-            inp = input,
-            c;
-
-        for (; i < endIndex; i++) {
-            c = inp.charCodeAt(i);
-            if (c > 32) {
-                break;
-            }
-
-            if ((c !== 32) && (c !== 10) && (c !== 9) && (c !== 13)) {
-                break;
-            }
-         }
-
-        current = current.slice(length + i - mem + curr);
-        currentPos = i;
-
-        if (!current.length && (j < chunks.length - 1)) {
-            current = chunks[++j];
-            skipWhitespace(0); // skip space at the beginning of a chunk
-            return true; // things changed
-        }
-
-        return oldi !== i || oldj !== j;
-    }
-
-    function expect(arg, msg) {
-        // some older browsers return typeof 'function' for RegExp
-        var result = (Object.prototype.toString.call(arg) === '[object Function]') ? arg.call(parsers) : $(arg);
-        if (result) {
-            return result;
-        }
-        error(msg || (typeof(arg) === 'string' ? "expected '" + arg + "' got '" + input.charAt(i) + "'"
-                                               : "unexpected token"));
-    }
-
-    // Specialization of expect()
-    function expectChar(arg, msg) {
-        if (input.charAt(i) === arg) {
-            skipWhitespace(1);
-            return arg;
-        }
-        error(msg || "expected '" + arg + "' got '" + input.charAt(i) + "'");
-    }
-
-    function error(msg, type) {
-        var e = new Error(msg);
-        e.index = i;
-        e.type = type || 'Syntax';
-        throw e;
-    }
-
-    // Same as $(), but don't change the state of the parser,
-    // just return the match.
-    function peek(tok) {
-        if (typeof(tok) === 'string') {
-            return input.charAt(i) === tok;
-        } else {
-            return tok.test(current);
-        }
-    }
-
-    // Specialization of peek()
-    function peekChar(tok) {
-        return input.charAt(i) === tok;
-    }
-
-
-    function getInput(e, env) {
-        if (e.filename && env.currentFileInfo.filename && (e.filename !== env.currentFileInfo.filename)) {
-            return parser.imports.contents[e.filename];
-        } else {
-            return input;
-        }
-    }
-
-    function getLocation(index, inputStream) {
-        var n = index + 1,
-            line = null,
-            column = -1;
-
-        while (--n >= 0 && inputStream.charAt(n) !== '\n') {
-            column++;
-        }
-
-        if (typeof index === 'number') {
-            line = (inputStream.slice(0, index).match(/\n/g) || "").length;
-        }
-
-        return {
-            line: line,
-            column: column
-        };
-    }
-
-    function getDebugInfo(index, inputStream, env) {
-        var filename = env.currentFileInfo.filename;
-        if(less.mode !== 'browser' && less.mode !== 'rhino') {
-            filename = require('path').resolve(filename);
-        }
-
-        return {
-            lineNumber: getLocation(index, inputStream).line + 1,
-            fileName: filename
-        };
-    }
-
-    function LessError(e, env) {
-        var input = getInput(e, env),
-            loc = getLocation(e.index, input),
-            line = loc.line,
-            col  = loc.column,
-            callLine = e.call && getLocation(e.call, input).line,
-            lines = input.split('\n');
-
-        this.type = e.type || 'Syntax';
-        this.message = e.message;
-        this.filename = e.filename || env.currentFileInfo.filename;
-        this.index = e.index;
-        this.line = typeof(line) === 'number' ? line + 1 : null;
-        this.callLine = callLine + 1;
-        this.callExtract = lines[callLine];
-        this.stack = e.stack;
-        this.column = col;
-        this.extract = [
-            lines[line - 1],
-            lines[line],
-            lines[line + 1]
-        ];
-    }
-
-    LessError.prototype = new Error();
-    LessError.prototype.constructor = LessError;
-
-    this.env = env = env || {};
-
-    // The optimization level dictates the thoroughness of the parser,
-    // the lower the number, the less nodes it will create in the tree.
-    // This could matter for debugging, or if you want to access
-    // the individual nodes in the tree.
-    this.optimization = ('optimization' in this.env) ? this.env.optimization : 1;
-
-    //
-    // The Parser
-    //
-    parser = {
-
-        imports: imports,
-        //
-        // Parse an input string into an abstract syntax tree,
-        // @param str A string containing 'less' markup
-        // @param callback call `callback` when done.
-        // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply
-        //
-        parse: function (str, callback, additionalData) {
-            var root, line, lines, error = null, globalVars, modifyVars, preText = "";
-
-            i = j = currentPos = furthest = 0;
-
-            globalVars = (additionalData && additionalData.globalVars) ? less.Parser.serializeVars(additionalData.globalVars) + '\n' : '';
-            modifyVars = (additionalData && additionalData.modifyVars) ? '\n' + less.Parser.serializeVars(additionalData.modifyVars) : '';
-
-            if (globalVars || (additionalData && additionalData.banner)) {
-                preText = ((additionalData && additionalData.banner) ? additionalData.banner : "") + globalVars;
-                parser.imports.contentsIgnoredChars[env.currentFileInfo.filename] = preText.length;
-            }
-
-            str = str.replace(/\r\n/g, '\n');
-            // Remove potential UTF Byte Order Mark
-            input = str = preText + str.replace(/^\uFEFF/, '') + modifyVars;
-            parser.imports.contents[env.currentFileInfo.filename] = str;
-
-            // Split the input into chunks.
-            chunks = (function (input) {
-                var len = input.length, level = 0, parenLevel = 0,
-                    lastOpening, lastOpeningParen, lastMultiComment, lastMultiCommentEndBrace,
-                    chunks = [], emitFrom = 0,
-                    parserCurrentIndex, currentChunkStartIndex, cc, cc2, matched;
-
-                function fail(msg, index) {
-                    error = new(LessError)({
-                        index: index || parserCurrentIndex,
-                        type: 'Parse',
-                        message: msg,
-                        filename: env.currentFileInfo.filename
-                    }, env);
-                }
-
-                function emitChunk(force) {
-                    var len = parserCurrentIndex - emitFrom;
-                    if (((len < 512) && !force) || !len) {
-                        return;
-                    }
-                    chunks.push(input.slice(emitFrom, parserCurrentIndex + 1));
-                    emitFrom = parserCurrentIndex + 1;
-                }
-
-                for (parserCurrentIndex = 0; parserCurrentIndex < len; parserCurrentIndex++) {
-                    cc = input.charCodeAt(parserCurrentIndex);
-                    if (((cc >= 97) && (cc <= 122)) || (cc < 34)) {
-                        // a-z or whitespace
-                        continue;
-                    }
-
-                    switch (cc) {
-                        case 40:                        // (
-                            parenLevel++;
-                            lastOpeningParen = parserCurrentIndex;
-                            continue;
-                        case 41:                        // )
-                            if (--parenLevel < 0) {
-                                return fail("missing opening `(`");
-                            }
-                            continue;
-                        case 59:                        // ;
-                            if (!parenLevel) { emitChunk(); }
-                            continue;
-                        case 123:                       // {
-                            level++;
-                            lastOpening = parserCurrentIndex;
-                            continue;
-                        case 125:                       // }
-                            if (--level < 0) {
-                                return fail("missing opening `{`");
-                            }
-                            if (!level) { emitChunk(); }
-                            continue;
-                        case 92:                        // \
-                            if (parserCurrentIndex < len - 1) { parserCurrentIndex++; continue; }
-                            return fail("unescaped `\\`");
-                        case 34:
-                        case 39:
-                        case 96:                        // ", ' and `
-                            matched = 0;
-                            currentChunkStartIndex = parserCurrentIndex;
-                            for (parserCurrentIndex = parserCurrentIndex + 1; parserCurrentIndex < len; parserCurrentIndex++) {
-                                cc2 = input.charCodeAt(parserCurrentIndex);
-                                if (cc2 > 96) { continue; }
-                                if (cc2 == cc) { matched = 1; break; }
-                                if (cc2 == 92) {        // \
-                                    if (parserCurrentIndex == len - 1) {
-                                        return fail("unescaped `\\`");
-                                    }
-                                    parserCurrentIndex++;
-                                }
-                            }
-                            if (matched) { continue; }
-                            return fail("unmatched `" + String.fromCharCode(cc) + "`", currentChunkStartIndex);
-                        case 47:                        // /, check for comment
-                            if (parenLevel || (parserCurrentIndex == len - 1)) { continue; }
-                            cc2 = input.charCodeAt(parserCurrentIndex + 1);
-                            if (cc2 == 47) {
-                                // //, find lnfeed
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if ((cc2 <= 13) && ((cc2 == 10) || (cc2 == 13))) { break; }
-                                }
-                            } else if (cc2 == 42) {
-                                // /*, find */
-                                lastMultiComment = currentChunkStartIndex = parserCurrentIndex;
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len - 1; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if (cc2 == 125) { lastMultiCommentEndBrace = parserCurrentIndex; }
-                                    if (cc2 != 42) { continue; }
-                                    if (input.charCodeAt(parserCurrentIndex + 1) == 47) { break; }
-                                }
-                                if (parserCurrentIndex == len - 1) {
-                                    return fail("missing closing `*/`", currentChunkStartIndex);
-                                }
-                                parserCurrentIndex++;
-                            }
-                            continue;
-                        case 42:                       // *, check for unmatched */
-                            if ((parserCurrentIndex < len - 1) && (input.charCodeAt(parserCurrentIndex + 1) == 47)) {
-                                return fail("unmatched `/*`");
-                            }
-                            continue;
-                    }
-                }
-
-                if (level !== 0) {
-                    if ((lastMultiComment > lastOpening) && (lastMultiCommentEndBrace > lastMultiComment)) {
-                        return fail("missing closing `}` or `*/`", lastOpening);
-                    } else {
-                        return fail("missing closing `}`", lastOpening);
-                    }
-                } else if (parenLevel !== 0) {
-                    return fail("missing closing `)`", lastOpeningParen);
-                }
-
-                emitChunk(true);
-                return chunks;
-            })(str);
-
-            if (error) {
-                return callback(new(LessError)(error, env));
-            }
-
-            current = chunks[0];
-
-            // Start with the primary rule.
-            // The whole syntax tree is held under a Ruleset node,
-            // with the `root` property set to true, so no `{}` are
-            // output. The callback is called when the input is parsed.
-            try {
-                root = new(tree.Ruleset)(null, this.parsers.primary());
-                root.root = true;
-                root.firstRoot = true;
-            } catch (e) {
-                return callback(new(LessError)(e, env));
-            }
-
-            root.toCSS = (function (evaluate) {
-                return function (options, variables) {
-                    options = options || {};
-                    var evaldRoot,
-                        css,
-                        evalEnv = new tree.evalEnv(options);
-
-                    //
-                    // Allows setting variables with a hash, so:
-                    //
-                    //   `{ color: new(tree.Color)('#f01') }` will become:
-                    //
-                    //   new(tree.Rule)('@color',
-                    //     new(tree.Value)([
-                    //       new(tree.Expression)([
-                    //         new(tree.Color)('#f01')
-                    //       ])
-                    //     ])
-                    //   )
-                    //
-                    if (typeof(variables) === 'object' && !Array.isArray(variables)) {
-                        variables = Object.keys(variables).map(function (k) {
-                            var value = variables[k];
-
-                            if (! (value instanceof tree.Value)) {
-                                if (! (value instanceof tree.Expression)) {
-                                    value = new(tree.Expression)([value]);
-                                }
-                                value = new(tree.Value)([value]);
-                            }
-                            return new(tree.Rule)('@' + k, value, false, null, 0);
-                        });
-                        evalEnv.frames = [new(tree.Ruleset)(null, variables)];
-                    }
-
-                    try {
-                        var preEvalVisitors = [],
-                            visitors = [
-                                new(tree.joinSelectorVisitor)(),
-                                new(tree.processExtendsVisitor)(),
-                                new(tree.toCSSVisitor)({compress: Boolean(options.compress)})
-                            ], i, root = this;
-
-                        if (options.plugins) {
-                            for(i =0; i < options.plugins.length; i++) {
-                                if (options.plugins[i].isPreEvalVisitor) {
-                                    preEvalVisitors.push(options.plugins[i]);
-                                } else {
-                                    if (options.plugins[i].isPreVisitor) {
-                                        visitors.splice(0, 0, options.plugins[i]);
-                                    } else {
-                                        visitors.push(options.plugins[i]);
-                                    }
-                                }
-                            }
-                        }
-
-                        for(i = 0; i < preEvalVisitors.length; i++) {
-                            preEvalVisitors[i].run(root);
-                        }
-
-                        evaldRoot = evaluate.call(root, evalEnv);
-
-                        for(i = 0; i < visitors.length; i++) {
-                            visitors[i].run(evaldRoot);
-                        }
-
-                        if (options.sourceMap) {
-                            evaldRoot = new tree.sourceMapOutput(
-                                {
-                                    contentsIgnoredCharsMap: parser.imports.contentsIgnoredChars,
-                                    writeSourceMap: options.writeSourceMap,
-                                    rootNode: evaldRoot,
-                                    contentsMap: parser.imports.contents,
-                                    sourceMapFilename: options.sourceMapFilename,
-                                    sourceMapURL: options.sourceMapURL,
-                                    outputFilename: options.sourceMapOutputFilename,
-                                    sourceMapBasepath: options.sourceMapBasepath,
-                                    sourceMapRootpath: options.sourceMapRootpath,
-                                    outputSourceFiles: options.outputSourceFiles,
-                                    sourceMapGenerator: options.sourceMapGenerator
-                                });
-                        }
-
-                        css = evaldRoot.toCSS({
-                                compress: Boolean(options.compress),
-                                dumpLineNumbers: env.dumpLineNumbers,
-                                strictUnits: Boolean(options.strictUnits),
-                                numPrecision: 8});
-                    } catch (e) {
-                        throw new(LessError)(e, env);
-                    }
-
-                    if (options.cleancss && less.mode === 'node') {
-                        var CleanCSS = require('clean-css'),
-                            cleancssOptions = options.cleancssOptions || {};
-
-                        if (cleancssOptions.keepSpecialComments === undefined) {
-                            cleancssOptions.keepSpecialComments = "*";
-                        }
-                        cleancssOptions.processImport = false;
-                        cleancssOptions.noRebase = true;
-                        if (cleancssOptions.noAdvanced === undefined) {
-                            cleancssOptions.noAdvanced = true;
-                        }
-
-                        return new CleanCSS(cleancssOptions).minify(css);
-                    } else if (options.compress) {
-                        return css.replace(/(^(\s)+)|((\s)+$)/g, "");
-                    } else {
-                        return css;
-                    }
-                };
-            })(root.eval);
-
-            // If `i` is smaller than the `input.length - 1`,
-            // it means the parser wasn't able to parse the whole
-            // string, so we've got a parsing error.
-            //
-            // We try to extract a \n delimited string,
-            // showing the line where the parse error occured.
-            // We split it up into two parts (the part which parsed,
-            // and the part which didn't), so we can color them differently.
-            if (i < input.length - 1) {
-                i = furthest;
-                var loc = getLocation(i, input);
-                lines = input.split('\n');
-                line = loc.line + 1;
-
-                error = {
-                    type: "Parse",
-                    message: "Unrecognised input",
-                    index: i,
-                    filename: env.currentFileInfo.filename,
-                    line: line,
-                    column: loc.column,
-                    extract: [
-                        lines[line - 2],
-                        lines[line - 1],
-                        lines[line]
-                    ]
-                };
-            }
-
-            var finish = function (e) {
-                e = error || e || parser.imports.error;
-
-                if (e) {
-                    if (!(e instanceof LessError)) {
-                        e = new(LessError)(e, env);
-                    }
-
-                    return callback(e);
-                }
-                else {
-                    return callback(null, root);
-                }
-            };
-
-            if (env.processImports !== false) {
-                new tree.importVisitor(this.imports, finish)
-                    .run(root);
-            } else {
-                return finish();
-            }
-        },
-
-        //
-        // Here in, the parsing rules/functions
-        //
-        // The basic structure of the syntax tree generated is as follows:
-        //
-        //   Ruleset ->  Rule -> Value -> Expression -> Entity
-        //
-        // Here's some LESS code:
-        //
-        //    .class {
-        //      color: #fff;
-        //      border: 1px solid #000;
-        //      width: @w + 4px;
-        //      > .child {...}
-        //    }
-        //
-        // And here's what the parse tree might look like:
-        //
-        //     Ruleset (Selector '.class', [
-        //         Rule ("color",  Value ([Expression [Color #fff]]))
-        //         Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
-        //         Rule ("width",  Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
-        //         Ruleset (Selector [Element '>', '.child'], [...])
-        //     ])
-        //
-        //  In general, most rules will try to parse a token with the `$()` function, and if the return
-        //  value is truly, will return a new node, of the relevant type. Sometimes, we need to check
-        //  first, before parsing, that's when we use `peek()`.
-        //
-        parsers: parsers = {
-            //
-            // The `primary` rule is the *entry* and *exit* point of the parser.
-            // The rules here can appear at any level of the parse tree.
-            //
-            // The recursive nature of the grammar is an interplay between the `block`
-            // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
-            // as represented by this simplified grammar:
-            //
-            //     primary  →  (ruleset | rule)+
-            //     ruleset  →  selector+ block
-            //     block    →  '{' primary '}'
-            //
-            // Only at one point is the primary rule not called from the
-            // block rule: at the root level.
-            //
-            primary: function () {
-                var mixin = this.mixin, $re = _$re, root = [], node;
-
-                while (current)
-                {
-                    node = this.extendRule() || mixin.definition() || this.rule() || this.ruleset() ||
-                        mixin.call() || this.comment() || this.directive();
-                    if (node) {
-                        root.push(node);
-                    } else {
-                        if (!($re(/^[\s\n]+/) || $re(/^;+/))) {
-                            break;
-                        }
-                    }
-                }
-
-                return root;
-            },
-
-            // We create a Comment node for CSS comments `/* */`,
-            // but keep the LeSS comments `//` silent, by just skipping
-            // over them.
-            comment: function () {
-                var comment;
-
-                if (input.charAt(i) !== '/') { return; }
-
-                if (input.charAt(i + 1) === '/') {
-                    return new(tree.Comment)($re(/^\/\/.*/), true, i, env.currentFileInfo);
-                }
-                comment = $re(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/);
-                if (comment) {
-                    return new(tree.Comment)(comment, false, i, env.currentFileInfo);
-                }
-            },
-
-            comments: function () {
-                var comment, comments = [];
-
-                while(true) {
-                    comment = this.comment();
-                    if (!comment) {
-                        break;
-                    }
-                    comments.push(comment);
-                }
-
-                return comments;
-            },
-
-            //
-            // Entities are tokens which can be found inside an Expression
-            //
-            entities: {
-                //
-                // A string, which supports escaping " and '
-                //
-                //     "milky way" 'he\'s the one!'
-                //
-                quoted: function () {
-                    var str, j = i, e, index = i;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '"' && input.charAt(j) !== "'") { return; }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/);
-                    if (str) {
-                        return new(tree.Quoted)(str[0], str[1] || str[2], e, index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A catch-all word, such as:
-                //
-                //     black border-collapse
-                //
-                keyword: function () {
-                    var k;
-
-                    k = $re(/^[_A-Za-z-][_A-Za-z0-9-]*/);
-                    if (k) {
-                        var color = tree.Color.fromKeyword(k);
-                        if (color) {
-                            return color;
-                        }
-                        return new(tree.Keyword)(k);
-                    }
-                },
-
-                //
-                // A function call
-                //
-                //     rgb(255, 0, 255)
-                //
-                // We also try to catch IE's `alpha()`, but let the `alpha` parser
-                // deal with the details.
-                //
-                // The arguments are parsed with the `entities.arguments` parser.
-                //
-                call: function () {
-                    var name, nameLC, args, alpha_ret, index = i;
-
-                    name = /^([\w-]+|%|progid:[\w\.]+)\(/.exec(current);
-                    if (!name) { return; }
-
-                    name = name[1];
-                    nameLC = name.toLowerCase();
-                    if (nameLC === 'url') {
-                        return null;
-                    }
-
-                    i += name.length;
-
-                    if (nameLC === 'alpha') {
-                        alpha_ret = parsers.alpha();
-                        if(typeof alpha_ret !== 'undefined') {
-                            return alpha_ret;
-                        }
-                    }
-
-                    $char('('); // Parse the '(' and consume whitespace.
-
-                    args = this.arguments();
-
-                    if (! $char(')')) {
-                        return;
-                    }
-
-                    if (name) { return new(tree.Call)(name, args, index, env.currentFileInfo); }
-                },
-                arguments: function () {
-                    var args = [], arg;
-
-                    while (true) {
-                        arg = this.assignment() || parsers.expression();
-                        if (!arg) {
-                            break;
-                        }
-                        args.push(arg);
-                        if (! $char(',')) {
-                            break;
-                        }
-                    }
-                    return args;
-                },
-                literal: function () {
-                    return this.dimension() ||
-                           this.color() ||
-                           this.quoted() ||
-                           this.unicodeDescriptor();
-                },
-
-                // Assignments are argument entities for calls.
-                // They are present in ie filter properties as shown below.
-                //
-                //     filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
-                //
-
-                assignment: function () {
-                    var key, value;
-                    key = $re(/^\w+(?=\s?=)/i);
-                    if (!key) {
-                        return;
-                    }
-                    if (!$char('=')) {
-                        return;
-                    }
-                    value = parsers.entity();
-                    if (value) {
-                        return new(tree.Assignment)(key, value);
-                    }
-                },
-
-                //
-                // Parse url() tokens
-                //
-                // We use a specific rule for urls, because they don't really behave like
-                // standard function calls. The difference is that the argument doesn't have
-                // to be enclosed within a string, so it can't be parsed as an Expression.
-                //
-                url: function () {
-                    var value;
-
-                    if (input.charAt(i) !== 'u' || !$re(/^url\(/)) {
-                        return;
-                    }
-
-                    value = this.quoted() || this.variable() ||
-                            $re(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) || "";
-
-                    expectChar(')');
-
-                    return new(tree.URL)((value.value != null || value instanceof tree.Variable)
-                                        ? value : new(tree.Anonymous)(value), env.currentFileInfo);
-                },
-
-                //
-                // A Variable entity, such as `@fink`, in
-                //
-                //     width: @fink + 2px
-                //
-                // We use a different parser for variable definitions,
-                // see `parsers.variable`.
-                //
-                variable: function () {
-                    var name, index = i;
-
-                    if (input.charAt(i) === '@' && (name = $re(/^@@?[\w-]+/))) {
-                        return new(tree.Variable)(name, index, env.currentFileInfo);
-                    }
-                },
-
-                // A variable entity useing the protective {} e.g. @{var}
-                variableCurly: function () {
-                    var curly, index = i;
-
-                    if (input.charAt(i) === '@' && (curly = $re(/^@\{([\w-]+)\}/))) {
-                        return new(tree.Variable)("@" + curly[1], index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A Hexadecimal color
-                //
-                //     #4F3C2F
-                //
-                // `rgb` and `hsl` colors are parsed through the `entities.call` parser.
-                //
-                color: function () {
-                    var rgb;
-
-                    if (input.charAt(i) === '#' && (rgb = $re(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/))) {
-                        return new(tree.Color)(rgb[1]);
-                    }
-                },
-
-                //
-                // A Dimension, that is, a number and a unit
-                //
-                //     0.5em 95%
-                //
-                dimension: function () {
-                    var value, c = input.charCodeAt(i);
-                    //Is the first char of the dimension 0-9, '.', '+' or '-'
-                    if ((c > 57 || c < 43) || c === 47 || c == 44) {
-                        return;
-                    }
-
-                    value = $re(/^([+-]?\d*\.?\d+)(%|[a-z]+)?/);
-                    if (value) {
-                        return new(tree.Dimension)(value[1], value[2]);
-                    }
-                },
-
-                //
-                // A unicode descriptor, as is used in unicode-range
-                //
-                // U+0??  or U+00A1-00A9
-                //
-                unicodeDescriptor: function () {
-                    var ud;
-
-                    ud = $re(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/);
-                    if (ud) {
-                        return new(tree.UnicodeDescriptor)(ud[0]);
-                    }
-                },
-
-                //
-                // JavaScript code to be evaluated
-                //
-                //     `window.location.href`
-                //
-                javascript: function () {
-                    var str, j = i, e;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '`') { return; }
-                    if (env.javascriptEnabled !== undefined && !env.javascriptEnabled) {
-                        error("You are using JavaScript, which has been disabled.");
-                    }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^`([^`]*)`/);
-                    if (str) {
-                        return new(tree.JavaScript)(str[1], i, e);
-                    }
-                }
-            },
-
-            //
-            // The variable part of a variable definition. Used in the `rule` parser
-            //
-            //     @fink:
-            //
-            variable: function () {
-                var name;
-
-                if (input.charAt(i) === '@' && (name = $re(/^(@[\w-]+)\s*:/))) { return name[1]; }
-            },
-
-            //
-            // extend syntax - used to extend selectors
-            //
-            extend: function(isRule) {
-                var elements, e, index = i, option, extendList, extend;
-
-                if (!(isRule ? $re(/^&:extend\(/) : $re(/^:extend\(/))) { return; }
-
-                do {
-                    option = null;
-                    elements = null;
-                    while (! (option = $re(/^(all)(?=\s*(\)|,))/))) {
-                        e = this.element();
-                        if (!e) { break; }
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                    }
-
-                    option = option && option[1];
-
-                    extend = new(tree.Extend)(new(tree.Selector)(elements), option, index);
-                    if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-
-                } while($char(","));
-
-                expect(/^\)/);
-
-                if (isRule) {
-                    expect(/^;/);
-                }
-
-                return extendList;
-            },
-
-            //
-            // extendRule - used in a rule to extend all the parent selectors
-            //
-            extendRule: function() {
-                return this.extend(true);
-            },
-
-            //
-            // Mixins
-            //
-            mixin: {
-                //
-                // A Mixin call, with an optional argument list
-                //
-                //     #mixins > .square(#fff);
-                //     .rounded(4px, black);
-                //     .button;
-                //
-                // The `while` loop is there because mixins can be
-                // namespaced, but we only support the child and descendant
-                // selector for now.
-                //
-                call: function () {
-                    var s = input.charAt(i), important = false, index = i, elemIndex,
-                        elements, elem, e, c, args;
-
-                    if (s !== '.' && s !== '#') { return; }
-
-                    save(); // stop us absorbing part of an invalid selector
-
-                    while (true) {
-                        elemIndex = i;
-                        e = $re(/^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/);
-                        if (!e) {
-                            break;
-                        }
-                        elem = new(tree.Element)(c, e, elemIndex, env.currentFileInfo);
-                        if (elements) { elements.push(elem); } else { elements = [ elem ]; }
-                        c = $char('>');
-                    }
-
-                    if (elements) {
-                        if ($char('(')) {
-                            args = this.args(true).args;
-                            expectChar(')');
-                        }
-
-                        if (parsers.important()) {
-                            important = true;
-                        }
-
-                        if (parsers.end()) {
-                            return new(tree.mixin.Call)(elements, args, index, env.currentFileInfo, important);
-                        }
-                    }
-
-                    restore();
-                },
-                args: function (isCall) {
-                    var parsers = parser.parsers, entities = parsers.entities,
-                        returner = { args:null, variadic: false },
-                        expressions = [], argsSemiColon = [], argsComma = [],
-                        isSemiColonSeperated, expressionContainsNamed, name, nameLoop, value, arg;
-
-                    while (true) {
-                        if (isCall) {
-                            arg = parsers.expression();
-                        } else {
-                            parsers.comments();
-                            if (input.charAt(i) === '.' && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ variadic: true });
-                                break;
-                            }
-                            arg = entities.variable() || entities.literal() || entities.keyword();
-                        }
-
-                        if (!arg) {
-                            break;
-                        }
-
-                        nameLoop = null;
-                        if (arg.throwAwayComments) {
-                            arg.throwAwayComments();
-                        }
-                        value = arg;
-                        var val = null;
-
-                        if (isCall) {
-                            // Variable
-                            if (arg.value.length == 1) {
-                                val = arg.value[0];
-                            }
-                        } else {
-                            val = arg;
-                        }
-
-                        if (val && val instanceof tree.Variable) {
-                            if ($char(':')) {
-                                if (expressions.length > 0) {
-                                    if (isSemiColonSeperated) {
-                                        error("Cannot mix ; and , as delimiter types");
-                                    }
-                                    expressionContainsNamed = true;
-                                }
-                                value = expect(parsers.expression);
-                                nameLoop = (name = val.name);
-                            } else if (!isCall && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ name: arg.name, variadic: true });
-                                break;
-                            } else if (!isCall) {
-                                name = nameLoop = val.name;
-                                value = null;
-                            }
-                        }
-
-                        if (value) {
-                            expressions.push(value);
-                        }
-
-                        argsComma.push({ name:nameLoop, value:value });
-
-                        if ($char(',')) {
-                            continue;
-                        }
-
-                        if ($char(';') || isSemiColonSeperated) {
-
-                            if (expressionContainsNamed) {
-                                error("Cannot mix ; and , as delimiter types");
-                            }
-
-                            isSemiColonSeperated = true;
-
-                            if (expressions.length > 1) {
-                                value = new(tree.Value)(expressions);
-                            }
-                            argsSemiColon.push({ name:name, value:value });
-
-                            name = null;
-                            expressions = [];
-                            expressionContainsNamed = false;
-                        }
-                    }
-
-                    returner.args = isSemiColonSeperated ? argsSemiColon : argsComma;
-                    return returner;
-                },
-                //
-                // A Mixin definition, with a list of parameters
-                //
-                //     .rounded (@radius: 2px, @color) {
-                //        ...
-                //     }
-                //
-                // Until we have a finer grained state-machine, we have to
-                // do a look-ahead, to make sure we don't have a mixin call.
-                // See the `rule` function for more information.
-                //
-                // We start by matching `.rounded (`, and then proceed on to
-                // the argument list, which has optional default values.
-                // We store the parameters in `params`, with a `value` key,
-                // if there is a value, such as in the case of `@radius`.
-                //
-                // Once we've got our params list, and a closing `)`, we parse
-                // the `{...}` block.
-                //
-                definition: function () {
-                    var name, params = [], match, ruleset, cond, variadic = false;
-                    if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
-                        peek(/^[^{]*\}/)) {
-                        return;
-                    }
-
-                    save();
-
-                    match = $re(/^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/);
-                    if (match) {
-                        name = match[1];
-
-                        var argInfo = this.args(false);
-                        params = argInfo.args;
-                        variadic = argInfo.variadic;
-
-                        // .mixincall("@{a}");
-                        // looks a bit like a mixin definition.. so we have to be nice and restore
-                        if (!$char(')')) {
-                            furthest = i;
-                            restore();
-                        }
-
-                        parsers.comments();
-
-                        if ($re(/^when/)) { // Guard
-                            cond = expect(parsers.conditions, 'expected condition');
-                        }
-
-                        ruleset = parsers.block();
-
-                        if (ruleset) {
-                            return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);
-                        } else {
-                            restore();
-                        }
-                    }
-                }
-            },
-
-            //
-            // Entities are the smallest recognized token,
-            // and can be found inside a rule's value.
-            //
-            entity: function () {
-                var entities = this.entities;
-
-                return entities.literal() || entities.variable() || entities.url() ||
-                       entities.call()    || entities.keyword()  || entities.javascript() ||
-                       this.comment();
-            },
-
-            //
-            // A Rule terminator. Note that we use `peek()` to check for '}',
-            // because the `block` rule will be expecting it, but we still need to make sure
-            // it's there, if ';' was ommitted.
-            //
-            end: function () {
-                return $char(';') || peekChar('}');
-            },
-
-            //
-            // IE's alpha function
-            //
-            //     alpha(opacity=88)
-            //
-            alpha: function () {
-                var value;
-
-                if (! $re(/^\(opacity=/i)) { return; }
-                value = $re(/^\d+/) || this.entities.variable();
-                if (value) {
-                    expectChar(')');
-                    return new(tree.Alpha)(value);
-                }
-            },
-
-            //
-            // A Selector Element
-            //
-            //     div
-            //     + h1
-            //     #socks
-            //     input[type="text"]
-            //
-            // Elements are the building blocks for Selectors,
-            // they are made out of a `Combinator` (see combinator rule),
-            // and an element name, such as a tag a class, or `*`.
-            //
-            element: function () {
-                var e, c, v, index = i;
-
-                c = this.combinator();
-
-                e = $re(/^(?:\d+\.\d+|\d+)%/) || $re(/^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||
-                    $char('*') || $char('&') || this.attribute() || $re(/^\([^()@]+\)/) || $re(/^[\.#](?=@)/) ||
-                    this.entities.variableCurly();
-
-                if (! e) {
-                    if ($char('(')) {
-                        if ((v = this.selector()) && $char(')')) {
-                            e = new(tree.Paren)(v);
-                        }
-                    }
-                }
-
-                if (e) { return new(tree.Element)(c, e, index, env.currentFileInfo); }
-            },
-
-            //
-            // Combinators combine elements together, in a Selector.
-            //
-            // Because our parser isn't white-space sensitive, special care
-            // has to be taken, when parsing the descendant combinator, ` `,
-            // as it's an empty space. We have to check the previous character
-            // in the input, to see if it's a ` ` character. More info on how
-            // we deal with this in *combinator.js*.
-            //
-            combinator: function () {
-                var c = input.charAt(i);
-
-                if (c === '>' || c === '+' || c === '~' || c === '|' || c === '^') {
-                    i++;
-                    if (input.charAt(i) === '^') {
-                        c = '^^';
-                        i++;
-                    }
-                    while (isWhitespace(input, i)) { i++; }
-                    return new(tree.Combinator)(c);
-                } else if (isWhitespace(input, i - 1)) {
-                    return new(tree.Combinator)(" ");
-                } else {
-                    return new(tree.Combinator)(null);
-                }
-            },
-            //
-            // A CSS selector (see selector below)
-            // with less extensions e.g. the ability to extend and guard
-            //
-            lessSelector: function () {
-                return this.selector(true);
-            },
-            //
-            // A CSS Selector
-            //
-            //     .class > div + h1
-            //     li a:hover
-            //
-            // Selectors are made out of one or more Elements, see above.
-            //
-            selector: function (isLess) {
-                var index = i, $re = _$re, elements, extendList, c, e, extend, when, condition;
-
-                while ((isLess && (extend = this.extend())) || (isLess && (when = $re(/^when/))) || (e = this.element())) {
-                    if (when) {
-                        condition = expect(this.conditions, 'expected condition');
-                    } else if (condition) {
-                        error("CSS guard can only be used at the end of selector");
-                    } else if (extend) {
-                        if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-                    } else {
-                        if (extendList) { error("Extend can only be used at the end of selector"); }
-                        c = input.charAt(i);
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                        e = null;
-                    }
-                    if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') {
-                        break;
-                    }
-                }
-
-                if (elements) { return new(tree.Selector)(elements, extendList, condition, index, env.currentFileInfo); }
-                if (extendList) { error("Extend must be used to extend a selector, it cannot be used on its own"); }
-            },
-            attribute: function () {
-                if (! $char('[')) { return; }
-
-                var entities = this.entities,
-                    key, val, op;
-
-                if (!(key = entities.variableCurly())) {
-                    key = expect(/^(?:[_A-Za-z0-9-\*]*\|)?(?:[_A-Za-z0-9-]|\\.)+/);
-                }
-
-                op = $re(/^[|~*$^]?=/);
-                if (op) {
-                    val = entities.quoted() || $re(/^[0-9]+%/) || $re(/^[\w-]+/) || entities.variableCurly();
-                }
-
-                expectChar(']');
-
-                return new(tree.Attribute)(key, op, val);
-            },
-
-            //
-            // The `block` rule is used by `ruleset` and `mixin.definition`.
-            // It's a wrapper around the `primary` rule, with added `{}`.
-            //
-            block: function () {
-                var content;
-                if ($char('{') && (content = this.primary()) && $char('}')) {
-                    return content;
-                }
-            },
-
-            //
-            // div, .class, body > p {...}
-            //
-            ruleset: function () {
-                var selectors, s, rules, debugInfo;
-
-                save();
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                while (true) {
-                    s = this.lessSelector();
-                    if (!s) {
-                        break;
-                    }
-                    if (selectors) { selectors.push(s); } else { selectors = [ s ]; }
-                    this.comments();
-                    if (s.condition && selectors.length > 1) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    if (! $char(',')) { break; }
-                    if (s.condition) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    this.comments();
-                }
-
-                if (selectors && (rules = this.block())) {
-                    var ruleset = new(tree.Ruleset)(selectors, rules, env.strictImports);
-                    if (env.dumpLineNumbers) {
-                        ruleset.debugInfo = debugInfo;
-                    }
-                    return ruleset;
-                } else {
-                    // Backtrack
-                    furthest = i;
-                    restore();
-                }
-            },
-            rule: function (tryAnonymous) {
-                var name, value, c = input.charAt(i), important, merge = false;
-                save();
-
-                if (c === '.' || c === '#' || c === '&') { return; }
-
-                name = this.variable() || this.ruleProperty();
-                if (name) {
-                    // prefer to try to parse first if its a variable or we are compressing
-                    // but always fallback on the other one
-                    value = !tryAnonymous && (env.compress || (name.charAt && (name.charAt(0) === '@'))) ?
-                        (this.value() || this.anonymousValue()) :
-                        (this.anonymousValue() || this.value());
-
-                    important = this.important();
-
-                    // a name returned by this.ruleProperty() is always an array of the form:
-                    // [string-1, ..., string-n, ""] or [string-1, ..., string-n, "+"]
-                    // where each item is a tree.Keyword or tree.Variable
-                    merge = name.pop && (name.pop().value === "+");
-
-                    if (value && this.end()) {
-                        return new (tree.Rule)(name, value, important, merge, memo, env.currentFileInfo);
-                    } else {
-                        furthest = i;
-                        restore();
-                        if (value && !tryAnonymous) {
-                            return this.rule(true);
-                        }
-                    }
-                }
-            },
-            anonymousValue: function () {
-                var match;
-                match = /^([^@+\/'"*`(;{}-]*);/.exec(current);
-                if (match) {
-                    i += match[0].length - 1;
-                    return new(tree.Anonymous)(match[1]);
-                }
-            },
-
-            //
-            // An @import directive
-            //
-            //     @import "lib";
-            //
-            // Depending on our environemnt, importing is done differently:
-            // In the browser, it's an XHR request, in Node, it would be a
-            // file-system operation. The function used for importing is
-            // stored in `import`, which we pass to the Import constructor.
-            //
-            "import": function () {
-                var path, features, index = i;
-
-                save();
-
-                var dir = $re(/^@import?\s+/);
-
-                var options = (dir ? this.importOptions() : null) || {};
-
-                if (dir && (path = this.entities.quoted() || this.entities.url())) {
-                    features = this.mediaFeatures();
-                    if ($char(';')) {
-                        features = features && new(tree.Value)(features);
-                        return new(tree.Import)(path, features, options, index, env.currentFileInfo);
-                    }
-                }
-
-                restore();
-            },
-
-            importOptions: function() {
-                var o, options = {}, optionName, value;
-
-                // list of options, surrounded by parens
-                if (! $char('(')) { return null; }
-                do {
-                    o = this.importOption();
-                    if (o) {
-                        optionName = o;
-                        value = true;
-                        switch(optionName) {
-                            case "css":
-                                optionName = "less";
-                                value = false;
-                            break;
-                            case "once":
-                                optionName = "multiple";
-                                value = false;
-                            break;
-                        }
-                        options[optionName] = value;
-                        if (! $char(',')) { break; }
-                    }
-                } while (o);
-                expectChar(')');
-                return options;
-            },
-
-            importOption: function() {
-                var opt = $re(/^(less|css|multiple|once|inline|reference)/);
-                if (opt) {
-                    return opt[1];
-                }
-            },
-
-            mediaFeature: function () {
-                var entities = this.entities, nodes = [], e, p;
-                do {
-                    e = entities.keyword() || entities.variable();
-                    if (e) {
-                        nodes.push(e);
-                    } else if ($char('(')) {
-                        p = this.property();
-                        e = this.value();
-                        if ($char(')')) {
-                            if (p && e) {
-                                nodes.push(new(tree.Paren)(new(tree.Rule)(p, e, null, null, i, env.currentFileInfo, true)));
-                            } else if (e) {
-                                nodes.push(new(tree.Paren)(e));
-                            } else {
-                                return null;
-                            }
-                        } else { return null; }
-                    }
-                } while (e);
-
-                if (nodes.length > 0) {
-                    return new(tree.Expression)(nodes);
-                }
-            },
-
-            mediaFeatures: function () {
-                var entities = this.entities, features = [], e;
-                do {
-                    e = this.mediaFeature();
-                    if (e) {
-                        features.push(e);
-                        if (! $char(',')) { break; }
-                    } else {
-                        e = entities.variable();
-                        if (e) {
-                            features.push(e);
-                            if (! $char(',')) { break; }
-                        }
-                    }
-                } while (e);
-
-                return features.length > 0 ? features : null;
-            },
-
-            media: function () {
-                var features, rules, media, debugInfo;
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                if ($re(/^@media/)) {
-                    features = this.mediaFeatures();
-
-                    rules = this.block();
-                    if (rules) {
-                        media = new(tree.Media)(rules, features, i, env.currentFileInfo);
-                        if (env.dumpLineNumbers) {
-                            media.debugInfo = debugInfo;
-                        }
-                        return media;
-                    }
-                }
-            },
-
-            //
-            // A CSS Directive
-            //
-            //     @charset "utf-8";
-            //
-            directive: function () {
-                var index = i, name, value, rules, nonVendorSpecificName,
-                    hasBlock, hasIdentifier, hasExpression, identifier;
-
-                if (input.charAt(i) !== '@') { return; }
-
-                value = this['import']() || this.media();
-                if (value) {
-                    return value;
-                }
-
-                save();
-
-                name = $re(/^@[a-z-]+/);
-
-                if (!name) { return; }
-
-                nonVendorSpecificName = name;
-                if (name.charAt(1) == '-' && name.indexOf('-', 2) > 0) {
-                    nonVendorSpecificName = "@" + name.slice(name.indexOf('-', 2) + 1);
-                }
-
-                switch(nonVendorSpecificName) {
-                    case "@font-face":
-                        hasBlock = true;
-                        break;
-                    case "@viewport":
-                    case "@top-left":
-                    case "@top-left-corner":
-                    case "@top-center":
-                    case "@top-right":
-                    case "@top-right-corner":
-                    case "@bottom-left":
-                    case "@bottom-left-corner":
-                    case "@bottom-center":
-                    case "@bottom-right":
-                    case "@bottom-right-corner":
-                    case "@left-top":
-                    case "@left-middle":
-                    case "@left-bottom":
-                    case "@right-top":
-                    case "@right-middle":
-                    case "@right-bottom":
-                        hasBlock = true;
-                        break;
-                    case "@host":
-                    case "@page":
-                    case "@document":
-                    case "@supports":
-                    case "@keyframes":
-                        hasBlock = true;
-                        hasIdentifier = true;
-                        break;
-                    case "@namespace":
-                        hasExpression = true;
-                        break;
-                }
-
-                if (hasIdentifier) {
-                    identifier = ($re(/^[^{]+/) || '').trim();
-                    if (identifier) {
-                        name += " " + identifier;
-                    }
-                }
-
-                if (hasBlock) {
-                    rules = this.block();
-                    if (rules) {
-                        return new(tree.Directive)(name, rules, index, env.currentFileInfo);
-                    }
-                } else {
-                    value = hasExpression ? this.expression() : this.entity();
-                    if (value && $char(';')) {
-                        var directive = new(tree.Directive)(name, value, index, env.currentFileInfo);
-                        if (env.dumpLineNumbers) {
-                            directive.debugInfo = getDebugInfo(i, input, env);
-                        }
-                        return directive;
-                    }
-                }
-
-                restore();
-            },
-
-            //
-            // A Value is a comma-delimited list of Expressions
-            //
-            //     font-family: Baskerville, Georgia, serif;
-            //
-            // In a Rule, a Value represents everything after the `:`,
-            // and before the `;`.
-            //
-            value: function () {
-                var e, expressions = [];
-
-                do {
-                    e = this.expression();
-                    if (e) {
-                        expressions.push(e);
-                        if (! $char(',')) { break; }
-                    }
-                } while(e);
-
-                if (expressions.length > 0) {
-                    return new(tree.Value)(expressions);
-                }
-            },
-            important: function () {
-                if (input.charAt(i) === '!') {
-                    return $re(/^! *important/);
-                }
-            },
-            sub: function () {
-                var a, e;
-
-                if ($char('(')) {
-                    a = this.addition();
-                    if (a) {
-                        e = new(tree.Expression)([a]);
-                        expectChar(')');
-                        e.parens = true;
-                        return e;
-                    }
-                }
-            },
-            multiplication: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.operand();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        if (peek(/^\/[*\/]/)) {
-                            break;
-                        }
-                        op = $char('/') || $char('*');
-
-                        if (!op) { break; }
-
-                        a = this.operand();
-
-                        if (!a) { break; }
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            addition: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.multiplication();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        op = $re(/^[-+]\s+/) || (!isSpaced && ($char('+') || $char('-')));
-                        if (!op) {
-                            break;
-                        }
-                        a = this.multiplication();
-                        if (!a) {
-                            break;
-                        }
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            conditions: function () {
-                var a, b, index = i, condition;
-
-                a = this.condition();
-                if (a) {
-                    while (true) {
-                        if (!peek(/^,\s*(not\s*)?\(/) || !$char(',')) {
-                            break;
-                        }
-                        b = this.condition();
-                        if (!b) {
-                            break;
-                        }
-                        condition = new(tree.Condition)('or', condition || a, b, index);
-                    }
-                    return condition || a;
-                }
-            },
-            condition: function () {
-                var entities = this.entities, index = i, negate = false,
-                    a, b, c, op;
-
-                if ($re(/^not/)) { negate = true; }
-                expectChar('(');
-                a = this.addition() || entities.keyword() || entities.quoted();
-                if (a) {
-                    op = $re(/^(?:>=|<=|=<|[<=>])/);
-                    if (op) {
-                        b = this.addition() || entities.keyword() || entities.quoted();
-                        if (b) {
-                            c = new(tree.Condition)(op, a, b, index, negate);
-                        } else {
-                            error('expected expression');
-                        }
-                    } else {
-                        c = new(tree.Condition)('=', a, new(tree.Keyword)('true'), index, negate);
-                    }
-                    expectChar(')');
-                    return $re(/^and/) ? new(tree.Condition)('and', c, this.condition()) : c;
-                }
-            },
-
-            //
-            // An operand is anything that can be part of an operation,
-            // such as a Color, or a Variable
-            //
-            operand: function () {
-                var entities = this.entities,
-                    p = input.charAt(i + 1), negate;
-
-                if (input.charAt(i) === '-' && (p === '@' || p === '(')) { negate = $char('-'); }
-                var o = this.sub() || entities.dimension() ||
-                        entities.color() || entities.variable() ||
-                        entities.call();
-
-                if (negate) {
-                    o.parensInOp = true;
-                    o = new(tree.Negative)(o);
-                }
-
-                return o;
-            },
-
-            //
-            // Expressions either represent mathematical operations,
-            // or white-space delimited Entities.
-            //
-            //     1px solid black
-            //     @var * 2
-            //
-            expression: function () {
-                var entities = [], e, delim;
-
-                do {
-                    e = this.addition() || this.entity();
-                    if (e) {
-                        entities.push(e);
-                        // operations do not allow keyword "/" dimension (e.g. small/20px) so we support that here
-                        if (!peek(/^\/[\/*]/)) {
-                            delim = $char('/');
-                            if (delim) {
-                                entities.push(new(tree.Anonymous)(delim));
-                            }
-                        }
-                    }
-                } while (e);
-                if (entities.length > 0) {
-                    return new(tree.Expression)(entities);
-                }
-            },
-            property: function () {
-                var name = $re(/^(\*?-?[_a-zA-Z0-9-]+)\s*:/);
-                if (name) {
-                    return name[1];
-                }
-            },
-            ruleProperty: function () {
-                var c = current, name = [], index = [], length = 0, s, k;
-
-                function match(re) {
-                    var a = re.exec(c);
-                    if (a) {
-                        index.push(i + length);
-                        length += a[0].length;
-                        c = c.slice(a[1].length);
-                        return name.push(a[1]);
-                    }
-                }
-
-                match(/^(\*?)/);
-                while (match(/^((?:[\w-]+)|(?:@\{[\w-]+\}))/)); // !
-                if ((name.length > 1) && match(/^\s*(\+?)\s*:/)) {
-                    // at last, we have the complete match now. move forward,
-                    // convert name particles to tree objects and return:
-                    skipWhitespace(length);
-                    if (name[0] === '') {
-                        name.shift();
-                        index.shift();
-                    }
-                    for (k = 0; k < name.length; k++) {
-                        s = name[k];
-                        name[k] = (s.charAt(0) !== '@')
-                            ? new(tree.Keyword)(s)
-                            : new(tree.Variable)('@' + s.slice(2, -1),
-                                index[k], env.currentFileInfo);
-                    }
-                    return name;
-                }
-            }
-        }
-    };
-    return parser;
-};
-less.Parser.serializeVars = function(vars) {
-    var s = '';
-
-    for (var name in vars) {
-        if (Object.hasOwnProperty.call(vars, name)) {
-            var value = vars[name];
-            s += ((name[0] === '@') ? '' : '@') + name +': '+ value +
-                    ((('' + value).slice(-1) === ';') ? '' : ';');
-        }
-    }
-
-    return s;
-};
-
-(function (tree) {
-
-tree.functions = {
-    rgb: function (r, g, b) {
-        return this.rgba(r, g, b, 1.0);
-    },
-    rgba: function (r, g, b, a) {
-        var rgb = [r, g, b].map(function (c) { return scaled(c, 255); });
-        a = number(a);
-        return new(tree.Color)(rgb, a);
-    },
-    hsl: function (h, s, l) {
-        return this.hsla(h, s, l, 1.0);
-    },
-    hsla: function (h, s, l, a) {
-        function hue(h) {
-            h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
-            if      (h * 6 < 1) { return m1 + (m2 - m1) * h * 6; }
-            else if (h * 2 < 1) { return m2; }
-            else if (h * 3 < 2) { return m1 + (m2 - m1) * (2/3 - h) * 6; }
-            else                { return m1; }
-        }
-
-        h = (number(h) % 360) / 360;
-        s = clamp(number(s)); l = clamp(number(l)); a = clamp(number(a));
-
-        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
-        var m1 = l * 2 - m2;
-
-        return this.rgba(hue(h + 1/3) * 255,
-                         hue(h)       * 255,
-                         hue(h - 1/3) * 255,
-                         a);
-    },
-
-    hsv: function(h, s, v) {
-        return this.hsva(h, s, v, 1.0);
-    },
-
-    hsva: function(h, s, v, a) {
-        h = ((number(h) % 360) / 360) * 360;
-        s = number(s); v = number(v); a = number(a);
-
-        var i, f;
-        i = Math.floor((h / 60) % 6);
-        f = (h / 60) - i;
-
-        var vs = [v,
-                  v * (1 - s),
-                  v * (1 - f * s),
-                  v * (1 - (1 - f) * s)];
-        var perm = [[0, 3, 1],
-                    [2, 0, 1],
-                    [1, 0, 3],
-                    [1, 2, 0],
-                    [3, 1, 0],
-                    [0, 1, 2]];
-
-        return this.rgba(vs[perm[i][0]] * 255,
-                         vs[perm[i][1]] * 255,
-                         vs[perm[i][2]] * 255,
-                         a);
-    },
-
-    hue: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().h));
-    },
-    saturation: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().s * 100), '%');
-    },
-    lightness: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().l * 100), '%');
-    },
-    hsvhue: function(color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().h));
-    },
-    hsvsaturation: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().s * 100), '%');
-    },
-    hsvvalue: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().v * 100), '%');
-    },
-    red: function (color) {
-        return new(tree.Dimension)(color.rgb[0]);
-    },
-    green: function (color) {
-        return new(tree.Dimension)(color.rgb[1]);
-    },
-    blue: function (color) {
-        return new(tree.Dimension)(color.rgb[2]);
-    },
-    alpha: function (color) {
-        return new(tree.Dimension)(color.toHSL().a);
-    },
-    luma: function (color) {
-        return new(tree.Dimension)(Math.round(color.luma() * color.alpha * 100), '%');
-    },
-    saturate: function (color, amount) {
-        // filter: saturate(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        var hsl = color.toHSL();
-
-        hsl.s += amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    desaturate: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.s -= amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    lighten: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l += amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    darken: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l -= amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    fadein: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a += amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fadeout: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a -= amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fade: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a = amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    spin: function (color, amount) {
-        var hsl = color.toHSL();
-        var hue = (hsl.h + amount.value) % 360;
-
-        hsl.h = hue < 0 ? 360 + hue : hue;
-
-        return hsla(hsl);
-    },
-    //
-    // Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
-    // http://sass-lang.com
-    //
-    mix: function (color1, color2, weight) {
-        if (!weight) {
-            weight = new(tree.Dimension)(50);
-        }
-        var p = weight.value / 100.0;
-        var w = p * 2 - 1;
-        var a = color1.toHSL().a - color2.toHSL().a;
-
-        var w1 = (((w * a == -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
-        var w2 = 1 - w1;
-
-        var rgb = [color1.rgb[0] * w1 + color2.rgb[0] * w2,
-                   color1.rgb[1] * w1 + color2.rgb[1] * w2,
-                   color1.rgb[2] * w1 + color2.rgb[2] * w2];
-
-        var alpha = color1.alpha * p + color2.alpha * (1 - p);
-
-        return new(tree.Color)(rgb, alpha);
-    },
-    greyscale: function (color) {
-        return this.desaturate(color, new(tree.Dimension)(100));
-    },
-    contrast: function (color, dark, light, threshold) {
-        // filter: contrast(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        if (typeof light === 'undefined') {
-            light = this.rgba(255, 255, 255, 1.0);
-        }
-        if (typeof dark === 'undefined') {
-            dark = this.rgba(0, 0, 0, 1.0);
-        }
-        //Figure out which is actually light and dark!
-        if (dark.luma() > light.luma()) {
-            var t = light;
-            light = dark;
-            dark = t;
-        }
-        if (typeof threshold === 'undefined') {
-            threshold = 0.43;
-        } else {
-            threshold = number(threshold);
-        }
-        if (color.luma() < threshold) {
-            return light;
-        } else {
-            return dark;
-        }
-    },
-    e: function (str) {
-        return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str);
-    },
-    escape: function (str) {
-        return new(tree.Anonymous)(encodeURI(str.value).replace(/=/g, "%3D").replace(/:/g, "%3A").replace(/#/g, "%23").replace(/;/g, "%3B").replace(/\(/g, "%28").replace(/\)/g, "%29"));
-    },
-    '%': function (quoted /* arg, arg, ...*/) {
-        var args = Array.prototype.slice.call(arguments, 1),
-            str = quoted.value;
-
-        for (var i = 0; i < args.length; i++) {
-            /*jshint loopfunc:true */
-            str = str.replace(/%[sda]/i, function(token) {
-                var value = token.match(/s/i) ? args[i].value : args[i].toCSS();
-                return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
-            });
-        }
-        str = str.replace(/%%/g, '%');
-        return new(tree.Quoted)('"' + str + '"', str);
-    },
-    unit: function (val, unit) {
-        if(!(val instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "the first argument to unit must be a number" + (val instanceof tree.Operation ? ". Have you forgotten parenthesis?" : "") };
-        }
-        return new(tree.Dimension)(val.value, unit ? unit.toCSS() : "");
-    },
-    convert: function (val, unit) {
-        return val.convertTo(unit.value);
-    },
-    round: function (n, f) {
-        var fraction = typeof(f) === "undefined" ? 0 : f.value;
-        return _math(function(num) { return num.toFixed(fraction); }, null, n);
-    },
-    pi: function () {
-        return new(tree.Dimension)(Math.PI);
-    },
-    mod: function(a, b) {
-        return new(tree.Dimension)(a.value % b.value, a.unit);
-    },
-    pow: function(x, y) {
-        if (typeof x === "number" && typeof y === "number") {
-            x = new(tree.Dimension)(x);
-            y = new(tree.Dimension)(y);
-        } else if (!(x instanceof tree.Dimension) || !(y instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "arguments must be numbers" };
-        }
-
-        return new(tree.Dimension)(Math.pow(x.value, y.value), x.unit);
-    },
-    _minmax: function (isMin, args) {
-        args = Array.prototype.slice.call(args);
-        switch(args.length) {
-        case 0: throw { type: "Argument", message: "one or more arguments required" };
-        case 1: return args[0];
-        }
-        var i, j, current, currentUnified, referenceUnified, unit,
-            order  = [], // elems only contains original argument values.
-            values = {}; // key is the unit.toString() for unified tree.Dimension values,
-                         // value is the index into the order array.
-        for (i = 0; i < args.length; i++) {
-            current = args[i];
-            if (!(current instanceof tree.Dimension)) {
-                order.push(current);
-                continue;
-            }
-            currentUnified = current.unify();
-            unit = currentUnified.unit.toString();
-            j = values[unit];
-            if (j === undefined) {
-                values[unit] = order.length;
-                order.push(current);
-                continue;
-            }
-            referenceUnified = order[j].unify();
-            if ( isMin && currentUnified.value < referenceUnified.value ||
-                !isMin && currentUnified.value > referenceUnified.value) {
-                order[j] = current;
-            }
-        }
-        if (order.length == 1) {
-            return order[0];
-        }
-        args = order.map(function (a) { return a.toCSS(this.env); })
-                    .join(this.env.compress ? "," : ", ");
-        return new(tree.Anonymous)((isMin ? "min" : "max") + "(" + args + ")");
-    },
-    min: function () {
-        return this._minmax(true, arguments);
-    },
-    max: function () {
-        return this._minmax(false, arguments);
-    },
-    argb: function (color) {
-        return new(tree.Anonymous)(color.toARGB());
-    },
-    percentage: function (n) {
-        return new(tree.Dimension)(n.value * 100, '%');
-    },
-    color: function (n) {
-        if (n instanceof tree.Quoted) {
-            var colorCandidate = n.value,
-                returnColor;
-            returnColor = tree.Color.fromKeyword(colorCandidate);
-            if (returnColor) {
-                return returnColor;
-            }
-            if (/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/.test(colorCandidate)) {
-                return new(tree.Color)(colorCandidate.slice(1));
-            }
-            throw { type: "Argument", message: "argument must be a color keyword or 3/6 digit hex e.g. #FFF" };
-        } else {
-            throw { type: "Argument", message: "argument must be a string" };
-        }
-    },
-    iscolor: function (n) {
-        return this._isa(n, tree.Color);
-    },
-    isnumber: function (n) {
-        return this._isa(n, tree.Dimension);
-    },
-    isstring: function (n) {
-        return this._isa(n, tree.Quoted);
-    },
-    iskeyword: function (n) {
-        return this._isa(n, tree.Keyword);
-    },
-    isurl: function (n) {
-        return this._isa(n, tree.URL);
-    },
-    ispixel: function (n) {
-        return this.isunit(n, 'px');
-    },
-    ispercentage: function (n) {
-        return this.isunit(n, '%');
-    },
-    isem: function (n) {
-        return this.isunit(n, 'em');
-    },
-    isunit: function (n, unit) {
-        return (n instanceof tree.Dimension) && n.unit.is(unit.value || unit) ? tree.True : tree.False;
-    },
-    _isa: function (n, Type) {
-        return (n instanceof Type) ? tree.True : tree.False;
-    },
-    tint: function(color, amount) {
-        return this.mix(this.rgb(255,255,255), color, amount);
-    },
-    shade: function(color, amount) {
-        return this.mix(this.rgb(0, 0, 0), color, amount);
-    },
-    extract: function(values, index) {
-        index = index.value - 1; // (1-based index)
-        // handle non-array values as an array of length 1
-        // return 'undefined' if index is invalid
-        return Array.isArray(values.value)
-            ? values.value[index] : Array(values)[index];
-    },
-    length: function(values) {
-        var n = Array.isArray(values.value) ? values.value.length : 1;
-        return new tree.Dimension(n);
-    },
-
-    "data-uri": function(mimetypeNode, filePathNode) {
-
-        if (typeof window !== 'undefined') {
-            return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-        }
-
-        var mimetype = mimetypeNode.value;
-        var filePath = (filePathNode && filePathNode.value);
-
-        var fs = require('fs'),
-            path = require('path'),
-            useBase64 = false;
-
-        if (arguments.length < 2) {
-            filePath = mimetype;
-        }
-
-        if (this.env.isPathRelative(filePath)) {
-            if (this.currentFileInfo.relativeUrls) {
-                filePath = path.join(this.currentFileInfo.currentDirectory, filePath);
-            } else {
-                filePath = path.join(this.currentFileInfo.entryPath, filePath);
-            }
-        }
-
-        // detect the mimetype if not given
-        if (arguments.length < 2) {
-            var mime;
-            try {
-                mime = require('mime');
-            } catch (ex) {
-                mime = tree._mime;
-            }
-
-            mimetype = mime.lookup(filePath);
-
-            // use base 64 unless it's an ASCII or UTF-8 format
-            var charset = mime.charsets.lookup(mimetype);
-            useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
-            if (useBase64) { mimetype += ';base64'; }
-        }
-        else {
-            useBase64 = /;base64$/.test(mimetype);
-        }
-
-        var buf = fs.readFileSync(filePath);
-
-        // IE8 cannot handle a data-uri larger than 32KB. If this is exceeded
-        // and the --ieCompat flag is enabled, return a normal url() instead.
-        var DATA_URI_MAX_KB = 32,
-            fileSizeInKB = parseInt((buf.length / 1024), 10);
-        if (fileSizeInKB >= DATA_URI_MAX_KB) {
-
-            if (this.env.ieCompat !== false) {
-                if (!this.env.silent) {
-                    console.warn("Skipped data-uri embedding of %s because its size (%dKB) exceeds IE8-safe %dKB!", filePath, fileSizeInKB, DATA_URI_MAX_KB);
-                }
-
-                return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-            }
-        }
-
-        buf = useBase64 ? buf.toString('base64')
-                        : encodeURIComponent(buf);
-
-        var uri = "\"data:" + mimetype + ',' + buf + "\"";
-        return new(tree.URL)(new(tree.Anonymous)(uri));
-    },
-
-    "svg-gradient": function(direction) {
-
-        function throwArgumentDescriptor() {
-            throw { type: "Argument", message: "svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position]" };
-        }
-
-        if (arguments.length < 3) {
-            throwArgumentDescriptor();
-        }
-        var stops = Array.prototype.slice.call(arguments, 1),
-            gradientDirectionSvg,
-            gradientType = "linear",
-            rectangleDimension = 'x="0" y="0" width="1" height="1"',
-            useBase64 = true,
-            renderEnv = {compress: false},
-            returner,
-            directionValue = direction.toCSS(renderEnv),
-            i, color, position, positionValue, alpha;
-
-        switch (directionValue) {
-            case "to bottom":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
-                break;
-            case "to right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
-                break;
-            case "to bottom right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
-                break;
-            case "to top right":
-                gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
-                break;
-            case "ellipse":
-            case "ellipse at center":
-                gradientType = "radial";
-                gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
-                rectangleDimension = 'x="-50" y="-50" width="101" height="101"';
-                break;
-            default:
-                throw { type: "Argument", message: "svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" };
-        }
-        returner = '<?xml version="1.0" ?>' +
-            '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' +
-            '<' + gradientType + 'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' + gradientDirectionSvg + '>';
-
-        for (i = 0; i < stops.length; i+= 1) {
-            if (stops[i].value) {
-                color = stops[i].value[0];
-                position = stops[i].value[1];
-            } else {
-                color = stops[i];
-                position = undefined;
-            }
-
-            if (!(color instanceof tree.Color) || (!((i === 0 || i+1 === stops.length) && position === undefined) && !(position instanceof tree.Dimension))) {
-                throwArgumentDescriptor();
-            }
-            positionValue = position ? position.toCSS(renderEnv) : i === 0 ? "0%" : "100%";
-            alpha = color.alpha;
-            returner += '<stop offset="' + positionValue + '" stop-color="' + color.toRGB() + '"' + (alpha < 1 ? ' stop-opacity="' + alpha + '"' : '') + '/>';
-        }
-        returner += '</' + gradientType + 'Gradient>' +
-                    '<rect ' + rectangleDimension + ' fill="url(#gradient)" /></svg>';
-
-        if (useBase64) {
-            try {
-                returner = require('./encoder').encodeBase64(returner); // TODO browser implementation
-            } catch(e) {
-                useBase64 = false;
-            }
-        }
-
-        returner = "'data:image/svg+xml" + (useBase64 ? ";base64" : "") + "," + returner + "'";
-        return new(tree.URL)(new(tree.Anonymous)(returner));
-    }
-};
-
-// these static methods are used as a fallback when the optional 'mime' dependency is missing
-tree._mime = {
-    // this map is intentionally incomplete
-    // if you want more, install 'mime' dep
-    _types: {
-        '.htm' : 'text/html',
-        '.html': 'text/html',
-        '.gif' : 'image/gif',
-        '.jpg' : 'image/jpeg',
-        '.jpeg': 'image/jpeg',
-        '.png' : 'image/png'
-    },
-    lookup: function (filepath) {
-        var ext = require('path').extname(filepath),
-            type = tree._mime._types[ext];
-        if (type === undefined) {
-            throw new Error('Optional dependency "mime" is required for ' + ext);
-        }
-        return type;
-    },
-    charsets: {
-        lookup: function (type) {
-            // assumes all text types are UTF-8
-            return type && (/^text\//).test(type) ? 'UTF-8' : '';
-        }
-    }
-};
-
-// Math
-
-var mathFunctions = {
- // name,  unit
-    ceil:  null,
-    floor: null,
-    sqrt:  null,
-    abs:   null,
-    tan:   "",
-    sin:   "",
-    cos:   "",
-    atan:  "rad",
-    asin:  "rad",
-    acos:  "rad"
-};
-
-function _math(fn, unit, n) {
-    if (!(n instanceof tree.Dimension)) {
-        throw { type: "Argument", message: "argument must be a number" };
-    }
-    if (unit == null) {
-        unit = n.unit;
-    } else {
-        n = n.unify();
-    }
-    return new(tree.Dimension)(fn(parseFloat(n.value)), unit);
-}
-
-// ~ End of Math
-
-// Color Blending
-// ref: http://www.w3.org/TR/compositing-1
-
-function colorBlend(mode, color1, color2) {
-    var ab = color1.alpha, cb, // backdrop
-        as = color2.alpha, cs, // source
-        ar, cr, r = [];        // result
-
-    ar = as + ab * (1 - as);
-    for (var i = 0; i < 3; i++) {
-        cb = color1.rgb[i] / 255;
-        cs = color2.rgb[i] / 255;
-        cr = mode(cb, cs);
-        if (ar) {
-            cr = (as * cs + ab * (cb
-                - as * (cb + cs - cr))) / ar;
-        }
-        r[i] = cr * 255;
-    }
-
-    return new(tree.Color)(r, ar);
-}
-
-var colorBlendMode = {
-    multiply: function(cb, cs) {
-        return cb * cs;
-    },
-    screen: function(cb, cs) {
-        return cb + cs - cb * cs;
-    },
-    overlay: function(cb, cs) {
-        cb *= 2;
-        return (cb <= 1)
-            ? colorBlendMode.multiply(cb, cs)
-            : colorBlendMode.screen(cb - 1, cs);
-    },
-    softlight: function(cb, cs) {
-        var d = 1, e = cb;
-        if (cs > 0.5) {
-            e = 1;
-            d = (cb > 0.25) ? Math.sqrt(cb)
-                : ((16 * cb - 12) * cb + 4) * cb;
-        }
-        return cb - (1 - 2 * cs) * e * (d - cb);
-    },
-    hardlight: function(cb, cs) {
-        return colorBlendMode.overlay(cs, cb);
-    },
-    difference: function(cb, cs) {
-        return Math.abs(cb - cs);
-    },
-    exclusion: function(cb, cs) {
-        return cb + cs - 2 * cb * cs;
-    },
-
-    // non-w3c functions:
-    average: function(cb, cs) {
-        return (cb + cs) / 2;
-    },
-    negation: function(cb, cs) {
-        return 1 - Math.abs(cb + cs - 1);
-    }
-};
-
-// ~ End of Color Blending
-
-tree.defaultFunc = {
-    eval: function () {
-        var v = this.value_, e = this.error_;
-        if (e) {
-            throw e;
-        }
-        if (v != null) {
-            return v ? tree.True : tree.False;
-        }
-    },
-    value: function (v) {
-        this.value_ = v;
-    },
-    error: function (e) {
-        this.error_ = e;
-    },
-    reset: function () {
-        this.value_ = this.error_ = null;
-    }
-};
-
-function initFunctions() {
-    var f, tf = tree.functions;
-
-    // math
-    for (f in mathFunctions) {
-        if (mathFunctions.hasOwnProperty(f)) {
-            tf[f] = _math.bind(null, Math[f], mathFunctions[f]);
-        }
-    }
-
-    // color blending
-    for (f in colorBlendMode) {
-        if (colorBlendMode.hasOwnProperty(f)) {
-            tf[f] = colorBlend.bind(null, colorBlendMode[f]);
-        }
-    }
-
-    // default
-    f = tree.defaultFunc;
-    tf["default"] = f.eval.bind(f);
-
-} initFunctions();
-
-function hsla(color) {
-    return tree.functions.hsla(color.h, color.s, color.l, color.a);
-}
-
-function scaled(n, size) {
-    if (n instanceof tree.Dimension && n.unit.is('%')) {
-        return parseFloat(n.value * size / 100);
-    } else {
-        return number(n);
-    }
-}
-
-function number(n) {
-    if (n instanceof tree.Dimension) {
-        return parseFloat(n.unit.is('%') ? n.value / 100 : n.value);
-    } else if (typeof(n) === 'number') {
-        return n;
-    } else {
-        throw {
-            error: "RuntimeError",
-            message: "color functions take numbers as parameters"
-        };
-    }
-}
-
-function clamp(val) {
-    return Math.min(1, Math.max(0, val));
-}
-
-tree.fround = function(env, value) {
-    var p;
-    if (env && (env.numPrecision != null)) {
-        p = Math.pow(10, env.numPrecision);
-        return Math.round(value * p) / p;
-    } else {
-        return value;
-    }
-};
-
-tree.functionCall = function(env, currentFileInfo) {
-    this.env = env;
-    this.currentFileInfo = currentFileInfo;
-};
-
-tree.functionCall.prototype = tree.functions;
-
-})(require('./tree'));
-
-(function (tree) {
-    tree.colors = {
-        'aliceblue':'#f0f8ff',
-        'antiquewhite':'#faebd7',
-        'aqua':'#00ffff',
-        'aquamarine':'#7fffd4',
-        'azure':'#f0ffff',
-        'beige':'#f5f5dc',
-        'bisque':'#ffe4c4',
-        'black':'#000000',
-        'blanchedalmond':'#ffebcd',
-        'blue':'#0000ff',
-        'blueviolet':'#8a2be2',
-        'brown':'#a52a2a',
-        'burlywood':'#deb887',
-        'cadetblue':'#5f9ea0',
-        'chartreuse':'#7fff00',
-        'chocolate':'#d2691e',
-        'coral':'#ff7f50',
-        'cornflowerblue':'#6495ed',
-        'cornsilk':'#fff8dc',
-        'crimson':'#dc143c',
-        'cyan':'#00ffff',
-        'darkblue':'#00008b',
-        'darkcyan':'#008b8b',
-        'darkgoldenrod':'#b8860b',
-        'darkgray':'#a9a9a9',
-        'darkgrey':'#a9a9a9',
-        'darkgreen':'#006400',
-        'darkkhaki':'#bdb76b',
-        'darkmagenta':'#8b008b',
-        'darkolivegreen':'#556b2f',
-        'darkorange':'#ff8c00',
-        'darkorchid':'#9932cc',
-        'darkred':'#8b0000',
-        'darksalmon':'#e9967a',
-        'darkseagreen':'#8fbc8f',
-        'darkslateblue':'#483d8b',
-        'darkslategray':'#2f4f4f',
-        'darkslategrey':'#2f4f4f',
-        'darkturquoise':'#00ced1',
-        'darkviolet':'#9400d3',
-        'deeppink':'#ff1493',
-        'deepskyblue':'#00bfff',
-        'dimgray':'#696969',
-        'dimgrey':'#696969',
-        'dodgerblue':'#1e90ff',
-        'firebrick':'#b22222',
-        'floralwhite':'#fffaf0',
-        'forestgreen':'#228b22',
-        'fuchsia':'#ff00ff',
-        'gainsboro':'#dcdcdc',
-        'ghostwhite':'#f8f8ff',
-        'gold':'#ffd700',
-        'goldenrod':'#daa520',
-        'gray':'#808080',
-        'grey':'#808080',
-        'green':'#008000',
-        'greenyellow':'#adff2f',
-        'honeydew':'#f0fff0',
-        'hotpink':'#ff69b4',
-        'indianred':'#cd5c5c',
-        'indigo':'#4b0082',
-        'ivory':'#fffff0',
-        'khaki':'#f0e68c',
-        'lavender':'#e6e6fa',
-        'lavenderblush':'#fff0f5',
-        'lawngreen':'#7cfc00',
-        'lemonchiffon':'#fffacd',
-        'lightblue':'#add8e6',
-        'lightcoral':'#f08080',
-        'lightcyan':'#e0ffff',
-        'lightgoldenrodyellow':'#fafad2',
-        'lightgray':'#d3d3d3',
-        'lightgrey':'#d3d3d3',
-        'lightgreen':'#90ee90',
-        'lightpink':'#ffb6c1',
-        'lightsalmon':'#ffa07a',
-        'lightseagreen':'#20b2aa',
-        'lightskyblue':'#87cefa',
-        'lightslategray':'#778899',
-        'lightslategrey':'#778899',
-        'lightsteelblue':'#b0c4de',
-        'lightyellow':'#ffffe0',
-        'lime':'#00ff00',
-        'limegreen':'#32cd32',
-        'linen':'#faf0e6',
-        'magenta':'#ff00ff',
-        'maroon':'#800000',
-        'mediumaquamarine':'#66cdaa',
-        'mediumblue':'#0000cd',
-        'mediumorchid':'#ba55d3',
-        'mediumpurple':'#9370d8',
-        'mediumseagreen':'#3cb371',
-        'mediumslateblue':'#7b68ee',
-        'mediumspringgreen':'#00fa9a',
-        'mediumturquoise':'#48d1cc',
-        'mediumvioletred':'#c71585',
-        'midnightblue':'#191970',
-        'mintcream':'#f5fffa',
-        'mistyrose':'#ffe4e1',
-        'moccasin':'#ffe4b5',
-        'navajowhite':'#ffdead',
-        'navy':'#000080',
-        'oldlace':'#fdf5e6',
-        'olive':'#808000',
-        'olivedrab':'#6b8e23',
-        'orange':'#ffa500',
-        'orangered':'#ff4500',
-        'orchid':'#da70d6',
-        'palegoldenrod':'#eee8aa',
-        'palegreen':'#98fb98',
-        'paleturquoise':'#afeeee',
-        'palevioletred':'#d87093',
-        'papayawhip':'#ffefd5',
-        'peachpuff':'#ffdab9',
-        'peru':'#cd853f',
-        'pink':'#ffc0cb',
-        'plum':'#dda0dd',
-        'powderblue':'#b0e0e6',
-        'purple':'#800080',
-        'red':'#ff0000',
-        'rosybrown':'#bc8f8f',
-        'royalblue':'#4169e1',
-        'saddlebrown':'#8b4513',
-        'salmon':'#fa8072',
-        'sandybrown':'#f4a460',
-        'seagreen':'#2e8b57',
-        'seashell':'#fff5ee',
-        'sienna':'#a0522d',
-        'silver':'#c0c0c0',
-        'skyblue':'#87ceeb',
-        'slateblue':'#6a5acd',
-        'slategray':'#708090',
-        'slategrey':'#708090',
-        'snow':'#fffafa',
-        'springgreen':'#00ff7f',
-        'steelblue':'#4682b4',
-        'tan':'#d2b48c',
-        'teal':'#008080',
-        'thistle':'#d8bfd8',
-        'tomato':'#ff6347',
-        'turquoise':'#40e0d0',
-        'violet':'#ee82ee',
-        'wheat':'#f5deb3',
-        'white':'#ffffff',
-        'whitesmoke':'#f5f5f5',
-        'yellow':'#ffff00',
-        'yellowgreen':'#9acd32'
-    };
-})(require('./tree'));
-
-(function (tree) {
-
-tree.debugInfo = function(env, ctx, lineSeperator) {
-    var result="";
-    if (env.dumpLineNumbers && !env.compress) {
-        switch(env.dumpLineNumbers) {
-            case 'comments':
-                result = tree.debugInfo.asComment(ctx);
-                break;
-            case 'mediaquery':
-                result = tree.debugInfo.asMediaQuery(ctx);
-                break;
-            case 'all':
-                result = tree.debugInfo.asComment(ctx) + (lineSeperator || "") + tree.debugInfo.asMediaQuery(ctx);
-                break;
-        }
-    }
-    return result;
-};
-
-tree.debugInfo.asComment = function(ctx) {
-    return '/* line ' + ctx.debugInfo.lineNumber + ', ' + ctx.debugInfo.fileName + ' */\n';
-};
-
-tree.debugInfo.asMediaQuery = function(ctx) {
-    return '@media -sass-debug-info{filename{font-family:' +
-        ('file://' + ctx.debugInfo.fileName).replace(/([.:\/\\])/g, function (a) {
-            if (a == '\\') {
-                a = '\/';
-            }
-            return '\\' + a;
-        }) +
-        '}line{font-family:\\00003' + ctx.debugInfo.lineNumber + '}}\n';
-};
-
-tree.find = function (obj, fun) {
-    for (var i = 0, r; i < obj.length; i++) {
-        r = fun.call(obj, obj[i]);
-        if (r) { return r; }
-    }
-    return null;
-};
-
-tree.jsify = function (obj) {
-    if (Array.isArray(obj.value) && (obj.value.length > 1)) {
-        return '[' + obj.value.map(function (v) { return v.toCSS(false); }).join(', ') + ']';
-    } else {
-        return obj.toCSS(false);
-    }
-};
-
-tree.toCSS = function (env) {
-    var strs = [];
-    this.genCSS(env, {
-        add: function(chunk, fileInfo, index) {
-            strs.push(chunk);
-        },
-        isEmpty: function () {
-            return strs.length === 0;
-        }
-    });
-    return strs.join('');
-};
-
-tree.outputRuleset = function (env, output, rules) {
-    var ruleCnt = rules.length, i;
-    env.tabLevel = (env.tabLevel | 0) + 1;
-
-    // Compressed
-    if (env.compress) {
-        output.add('{');
-        for (i = 0; i < ruleCnt; i++) {
-            rules[i].genCSS(env, output);
-        }
-        output.add('}');
-        env.tabLevel--;
-        return;
-    }
-
-    // Non-compressed
-    var tabSetStr = '\n' + Array(env.tabLevel).join("  "), tabRuleStr = tabSetStr + "  ";
-    if (!ruleCnt) {
-        output.add(" {" + tabSetStr + '}');
-    } else {
-        output.add(" {" + tabRuleStr);
-        rules[0].genCSS(env, output);
-        for (i = 1; i < ruleCnt; i++) {
-            output.add(tabRuleStr);
-            rules[i].genCSS(env, output);
-        }
-        output.add(tabSetStr + '}');
-    }
-
-    env.tabLevel--;
-};
-
-})(require('./tree'));
-
-(function (tree) {
-
-tree.Alpha = function (val) {
-    this.value = val;
-};
-tree.Alpha.prototype = {
-    type: "Alpha",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) { return new tree.Alpha(this.value.eval(env)); }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add("alpha(opacity=");
-
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-
-        output.add(")");
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Anonymous = function (string, index, currentFileInfo, mapLines) {
-    this.value = string.value || string;
-    this.index = index;
-    this.mapLines = mapLines;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Anonymous.prototype = {
-    type: "Anonymous",
-    eval: function () {
-        return new tree.Anonymous(this.value, this.index, this.currentFileInfo, this.mapLines);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left = this.toCSS(),
-            right = x.toCSS();
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    },
-    genCSS: function (env, output) {
-        output.add(this.value, this.currentFileInfo, this.index, this.mapLines);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Assignment = function (key, val) {
-    this.key = key;
-    this.value = val;
-};
-tree.Assignment.prototype = {
-    type: "Assignment",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) {
-            return new(tree.Assignment)(this.key, this.value.eval(env));
-        }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add(this.key + '=');
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A function call node.
-//
-tree.Call = function (name, args, index, currentFileInfo) {
-    this.name = name;
-    this.args = args;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Call.prototype = {
-    type: "Call",
-    accept: function (visitor) {
-        if (this.args) {
-            this.args = visitor.visitArray(this.args);
-        }
-    },
-    //
-    // When evaluating a function call,
-    // we either find the function in `tree.functions` [1],
-    // in which case we call it, passing the  evaluated arguments,
-    // if this returns null or we cannot find the function, we
-    // simply print it out as it appeared originally [2].
-    //
-    // The *functions.js* file contains the built-in functions.
-    //
-    // The reason why we evaluate the arguments, is in the case where
-    // we try to pass a variable to a function, like: `saturate(@color)`.
-    // The function should receive the value, not the variable.
-    //
-    eval: function (env) {
-        var args = this.args.map(function (a) { return a.eval(env); }),
-            nameLC = this.name.toLowerCase(),
-            result, func;
-
-        if (nameLC in tree.functions) { // 1.
-            try {
-                func = new tree.functionCall(env, this.currentFileInfo);
-                result = func[nameLC].apply(func, args);
-                if (result != null) {
-                    return result;
-                }
-            } catch (e) {
-                throw { type: e.type || "Runtime",
-                        message: "error evaluating function `" + this.name + "`" +
-                                 (e.message ? ': ' + e.message : ''),
-                        index: this.index, filename: this.currentFileInfo.filename };
-            }
-        }
-
-        return new tree.Call(this.name, args, this.index, this.currentFileInfo);
-    },
-
-    genCSS: function (env, output) {
-        output.add(this.name + "(", this.currentFileInfo, this.index);
-
-        for(var i = 0; i < this.args.length; i++) {
-            this.args[i].genCSS(env, output);
-            if (i + 1 < this.args.length) {
-                output.add(", ");
-            }
-        }
-
-        output.add(")");
-    },
-
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// RGB Colors - #ff0014, #eee
-//
-tree.Color = function (rgb, a) {
-    //
-    // The end goal here, is to parse the arguments
-    // into an integer triplet, such as `128, 255, 0`
-    //
-    // This facilitates operations and conversions.
-    //
-    if (Array.isArray(rgb)) {
-        this.rgb = rgb;
-    } else if (rgb.length == 6) {
-        this.rgb = rgb.match(/.{2}/g).map(function (c) {
-            return parseInt(c, 16);
-        });
-    } else {
-        this.rgb = rgb.split('').map(function (c) {
-            return parseInt(c + c, 16);
-        });
-    }
-    this.alpha = typeof(a) === 'number' ? a : 1;
-};
-
-var transparentKeyword = "transparent";
-
-tree.Color.prototype = {
-    type: "Color",
-    eval: function () { return this; },
-    luma: function () { return (0.2126 * this.rgb[0] / 255) + (0.7152 * this.rgb[1] / 255) + (0.0722 * this.rgb[2] / 255); },
-
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env, doNotCompress) {
-        var compress = env && env.compress && !doNotCompress,
-            alpha = tree.fround(env, this.alpha);
-
-        // If we have some transparency, the only way to represent it
-        // is via `rgba`. Otherwise, we use the hex representation,
-        // which has better compatibility with older browsers.
-        // Values are capped between `0` and `255`, rounded and zero-padded.
-        if (alpha < 1) {
-            if (alpha === 0 && this.isTransparentKeyword) {
-                return transparentKeyword;
-            }
-            return "rgba(" + this.rgb.map(function (c) {
-                return clamp(Math.round(c), 255);
-            }).concat(clamp(alpha, 1))
-                .join(',' + (compress ? '' : ' ')) + ")";
-        } else {
-            var color = this.toRGB();
-
-            if (compress) {
-                var splitcolor = color.split('');
-
-                // Convert color to short format
-                if (splitcolor[1] === splitcolor[2] && splitcolor[3] === splitcolor[4] && splitcolor[5] === splitcolor[6]) {
-                    color = '#' + splitcolor[1] + splitcolor[3] + splitcolor[5];
-                }
-            }
-
-            return color;
-        }
-    },
-
-    //
-    // Operations have to be done per-channel, if not,
-    // channels will spill onto each other. Once we have
-    // our result, in the form of an integer triplet,
-    // we create a new Color node to hold the result.
-    //
-    operate: function (env, op, other) {
-        var rgb = [];
-        var alpha = this.alpha * (1 - other.alpha) + other.alpha;
-        for (var c = 0; c < 3; c++) {
-            rgb[c] = tree.operate(env, op, this.rgb[c], other.rgb[c]);
-        }
-        return new(tree.Color)(rgb, alpha);
-    },
-
-    toRGB: function () {
-        return toHex(this.rgb);
-    },
-
-    toHSL: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, l = (max + min) / 2, d = max - min;
-
-        if (max === min) {
-            h = s = 0;
-        } else {
-            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
-
-            switch (max) {
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2;               break;
-                case b: h = (r - g) / d + 4;               break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, l: l, a: a };
-    },
-    //Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
-    toHSV: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, v = max;
-
-        var d = max - min;
-        if (max === 0) {
-            s = 0;
-        } else {
-            s = d / max;
-        }
-
-        if (max === min) {
-            h = 0;
-        } else {
-            switch(max){
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2; break;
-                case b: h = (r - g) / d + 4; break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, v: v, a: a };
-    },
-    toARGB: function () {
-        return toHex([this.alpha * 255].concat(this.rgb));
-    },
-    compare: function (x) {
-        if (!x.rgb) {
-            return -1;
-        }
-
-        return (x.rgb[0] === this.rgb[0] &&
-            x.rgb[1] === this.rgb[1] &&
-            x.rgb[2] === this.rgb[2] &&
-            x.alpha === this.alpha) ? 0 : -1;
-    }
-};
-
-tree.Color.fromKeyword = function(keyword) {
-    keyword = keyword.toLowerCase();
-
-    if (tree.colors.hasOwnProperty(keyword)) {
-        // detect named color
-        return new(tree.Color)(tree.colors[keyword].slice(1));
-    }
-    if (keyword === transparentKeyword) {
-        var transparent = new(tree.Color)([0, 0, 0], 0);
-        transparent.isTransparentKeyword = true;
-        return transparent;
-    }
-};
-
-function toHex(v) {
-    return '#' + v.map(function (c) {
-        c = clamp(Math.round(c), 255);
-        return (c < 16 ? '0' : '') + c.toString(16);
-    }).join('');
-}
-
-function clamp(v, max) {
-    return Math.min(Math.max(v, 0), max);
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Comment = function (value, silent, index, currentFileInfo) {
-    this.value = value;
-    this.silent = !!silent;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Comment.prototype = {
-    type: "Comment",
-    genCSS: function (env, output) {
-        if (this.debugInfo) {
-            output.add(tree.debugInfo(env, this), this.currentFileInfo, this.index);
-        }
-        output.add(this.value.trim()); //TODO shouldn't need to trim, we shouldn't grab the \n
-    },
-    toCSS: tree.toCSS,
-    isSilent: function(env) {
-        var isReference = (this.currentFileInfo && this.currentFileInfo.reference && !this.isReferenced),
-            isCompressed = env.compress && !this.value.match(/^\/\*!/);
-        return this.silent || isReference || isCompressed;
-    },
-    eval: function () { return this; },
-    markReferenced: function () {
-        this.isReferenced = true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Condition = function (op, l, r, i, negate) {
-    this.op = op.trim();
-    this.lvalue = l;
-    this.rvalue = r;
-    this.index = i;
-    this.negate = negate;
-};
-tree.Condition.prototype = {
-    type: "Condition",
-    accept: function (visitor) {
-        this.lvalue = visitor.visit(this.lvalue);
-        this.rvalue = visitor.visit(this.rvalue);
-    },
-    eval: function (env) {
-        var a = this.lvalue.eval(env),
-            b = this.rvalue.eval(env);
-
-        var i = this.index, result;
-
-        result = (function (op) {
-            switch (op) {
-                case 'and':
-                    return a && b;
-                case 'or':
-                    return a || b;
-                default:
-                    if (a.compare) {
-                        result = a.compare(b);
-                    } else if (b.compare) {
-                        result = b.compare(a);
-                    } else {
-                        throw { type: "Type",
-                                message: "Unable to perform comparison",
-                                index: i };
-                    }
-                    switch (result) {
-                        case -1: return op === '<' || op === '=<' || op === '<=';
-                        case  0: return op === '=' || op === '>=' || op === '=<' || op === '<=';
-                        case  1: return op === '>' || op === '>=';
-                    }
-            }
-        })(this.op);
-        return this.negate ? !result : result;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A number with a unit
-//
-tree.Dimension = function (value, unit) {
-    this.value = parseFloat(value);
-    this.unit = (unit && unit instanceof tree.Unit) ? unit :
-      new(tree.Unit)(unit ? [unit] : undefined);
-};
-
-tree.Dimension.prototype = {
-    type: "Dimension",
-    accept: function (visitor) {
-        this.unit = visitor.visit(this.unit);
-    },
-    eval: function (env) {
-        return this;
-    },
-    toColor: function () {
-        return new(tree.Color)([this.value, this.value, this.value]);
-    },
-    genCSS: function (env, output) {
-        if ((env && env.strictUnits) && !this.unit.isSingular()) {
-            throw new Error("Multiple units in dimension. Correct the units or use the unit function. Bad unit: "+this.unit.toString());
-        }
-
-        var value = tree.fround(env, this.value),
-            strValue = String(value);
-
-        if (value !== 0 && value < 0.000001 && value > -0.000001) {
-            // would be output 1e-6 etc.
-            strValue = value.toFixed(20).replace(/0+$/, "");
-        }
-
-        if (env && env.compress) {
-            // Zero values doesn't need a unit
-            if (value === 0 && this.unit.isLength()) {
-                output.add(strValue);
-                return;
-            }
-
-            // Float values doesn't need a leading zero
-            if (value > 0 && value < 1) {
-                strValue = (strValue).substr(1);
-            }
-        }
-
-        output.add(strValue);
-        this.unit.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-
-    // In an operation between two Dimensions,
-    // we default to the first Dimension's unit,
-    // so `1px + 2` will yield `3px`.
-    operate: function (env, op, other) {
-        /*jshint noempty:false */
-        var value = tree.operate(env, op, this.value, other.value),
-            unit = this.unit.clone();
-
-        if (op === '+' || op === '-') {
-            if (unit.numerator.length === 0 && unit.denominator.length === 0) {
-                unit.numerator = other.unit.numerator.slice(0);
-                unit.denominator = other.unit.denominator.slice(0);
-            } else if (other.unit.numerator.length === 0 && unit.denominator.length === 0) {
-                // do nothing
-            } else {
-                other = other.convertTo(this.unit.usedUnits());
-
-                if(env.strictUnits && other.unit.toString() !== unit.toString()) {
-                  throw new Error("Incompatible units. Change the units or use the unit function. Bad units: '" + unit.toString() +
-                    "' and '" + other.unit.toString() + "'.");
-                }
-
-                value = tree.operate(env, op, this.value, other.value);
-            }
-        } else if (op === '*') {
-            unit.numerator = unit.numerator.concat(other.unit.numerator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.denominator).sort();
-            unit.cancel();
-        } else if (op === '/') {
-            unit.numerator = unit.numerator.concat(other.unit.denominator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.numerator).sort();
-            unit.cancel();
-        }
-        return new(tree.Dimension)(value, unit);
-    },
-
-    compare: function (other) {
-        if (other instanceof tree.Dimension) {
-            var a = this.unify(), b = other.unify(),
-                aValue = a.value, bValue = b.value;
-
-            if (bValue > aValue) {
-                return -1;
-            } else if (bValue < aValue) {
-                return 1;
-            } else {
-                if (!b.unit.isEmpty() && a.unit.compare(b.unit) !== 0) {
-                    return -1;
-                }
-                return 0;
-            }
-        } else {
-            return -1;
-        }
-    },
-
-    unify: function () {
-        return this.convertTo({ length: 'm', duration: 's', angle: 'rad' });
-    },
-
-    convertTo: function (conversions) {
-        var value = this.value, unit = this.unit.clone(),
-            i, groupName, group, targetUnit, derivedConversions = {}, applyUnit;
-
-        if (typeof conversions === 'string') {
-            for(i in tree.UnitConversions) {
-                if (tree.UnitConversions[i].hasOwnProperty(conversions)) {
-                    derivedConversions = {};
-                    derivedConversions[i] = conversions;
-                }
-            }
-            conversions = derivedConversions;
-        }
-        applyUnit = function (atomicUnit, denominator) {
-          /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit)) {
-                if (denominator) {
-                    value = value / (group[atomicUnit] / group[targetUnit]);
-                } else {
-                    value = value * (group[atomicUnit] / group[targetUnit]);
-                }
-
-                return targetUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (groupName in conversions) {
-            if (conversions.hasOwnProperty(groupName)) {
-                targetUnit = conversions[groupName];
-                group = tree.UnitConversions[groupName];
-
-                unit.map(applyUnit);
-            }
-        }
-
-        unit.cancel();
-
-        return new(tree.Dimension)(value, unit);
-    }
-};
-
-// http://www.w3.org/TR/css3-values/#absolute-lengths
-tree.UnitConversions = {
-    length: {
-         'm': 1,
-        'cm': 0.01,
-        'mm': 0.001,
-        'in': 0.0254,
-        'pt': 0.0254 / 72,
-        'pc': 0.0254 / 72 * 12
-    },
-    duration: {
-        's': 1,
-        'ms': 0.001
-    },
-    angle: {
-        'rad': 1/(2*Math.PI),
-        'deg': 1/360,
-        'grad': 1/400,
-        'turn': 1
-    }
-};
-
-tree.Unit = function (numerator, denominator, backupUnit) {
-    this.numerator = numerator ? numerator.slice(0).sort() : [];
-    this.denominator = denominator ? denominator.slice(0).sort() : [];
-    this.backupUnit = backupUnit;
-};
-
-tree.Unit.prototype = {
-    type: "Unit",
-    clone: function () {
-        return new tree.Unit(this.numerator.slice(0), this.denominator.slice(0), this.backupUnit);
-    },
-    genCSS: function (env, output) {
-        if (this.numerator.length >= 1) {
-            output.add(this.numerator[0]);
-        } else
-        if (this.denominator.length >= 1) {
-            output.add(this.denominator[0]);
-        } else
-        if ((!env || !env.strictUnits) && this.backupUnit) {
-            output.add(this.backupUnit);
-        }
-    },
-    toCSS: tree.toCSS,
-
-    toString: function () {
-      var i, returnStr = this.numerator.join("*");
-      for (i = 0; i < this.denominator.length; i++) {
-          returnStr += "/" + this.denominator[i];
-      }
-      return returnStr;
-    },
-
-    compare: function (other) {
-        return this.is(other.toString()) ? 0 : -1;
-    },
-
-    is: function (unitString) {
-        return this.toString() === unitString;
-    },
-
-    isLength: function () {
-        return Boolean(this.toCSS().match(/px|em|%|in|cm|mm|pc|pt|ex/));
-    },
-
-    isEmpty: function () {
-        return this.numerator.length === 0 && this.denominator.length === 0;
-    },
-
-    isSingular: function() {
-        return this.numerator.length <= 1 && this.denominator.length === 0;
-    },
-
-    map: function(callback) {
-        var i;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            this.numerator[i] = callback(this.numerator[i], false);
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            this.denominator[i] = callback(this.denominator[i], true);
-        }
-    },
-
-    usedUnits: function() {
-        var group, result = {}, mapUnit;
-
-        mapUnit = function (atomicUnit) {
-        /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit) && !result[groupName]) {
-                result[groupName] = atomicUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (var groupName in tree.UnitConversions) {
-            if (tree.UnitConversions.hasOwnProperty(groupName)) {
-                group = tree.UnitConversions[groupName];
-
-                this.map(mapUnit);
-            }
-        }
-
-        return result;
-    },
-
-    cancel: function () {
-        var counter = {}, atomicUnit, i, backup;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            atomicUnit = this.numerator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) + 1;
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            atomicUnit = this.denominator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) - 1;
-        }
-
-        this.numerator = [];
-        this.denominator = [];
-
-        for (atomicUnit in counter) {
-            if (counter.hasOwnProperty(atomicUnit)) {
-                var count = counter[atomicUnit];
-
-                if (count > 0) {
-                    for (i = 0; i < count; i++) {
-                        this.numerator.push(atomicUnit);
-                    }
-                } else if (count < 0) {
-                    for (i = 0; i < -count; i++) {
-                        this.denominator.push(atomicUnit);
-                    }
-                }
-            }
-        }
-
-        if (this.numerator.length === 0 && this.denominator.length === 0 && backup) {
-            this.backupUnit = backup;
-        }
-
-        this.numerator.sort();
-        this.denominator.sort();
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Directive = function (name, value, index, currentFileInfo) {
-    this.name = name;
-
-    if (Array.isArray(value)) {
-        this.rules = [new(tree.Ruleset)(null, value)];
-        this.rules[0].allowImports = true;
-    } else {
-        this.value = value;
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-
-};
-tree.Directive.prototype = {
-    type: "Directive",
-    accept: function (visitor) {
-        if (this.rules) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-        if (this.value) {
-            this.value = visitor.visit(this.value);
-        }
-    },
-    genCSS: function (env, output) {
-        output.add(this.name, this.currentFileInfo, this.index);
-        if (this.rules) {
-            tree.outputRuleset(env, output, this.rules);
-        } else {
-            output.add(' ');
-            this.value.genCSS(env, output);
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var evaldDirective = this;
-        if (this.rules) {
-            env.frames.unshift(this);
-            evaldDirective = new(tree.Directive)(this.name, null, this.index, this.currentFileInfo);
-            evaldDirective.rules = [this.rules[0].eval(env)];
-            evaldDirective.rules[0].root = true;
-            env.frames.shift();
-        }
-        return evaldDirective;
-    },
-    variable: function (name) { return tree.Ruleset.prototype.variable.call(this.rules[0], name); },
-    find: function () { return tree.Ruleset.prototype.find.apply(this.rules[0], arguments); },
-    rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.rules[0]); },
-    markReferenced: function () {
-        var i, rules;
-        this.isReferenced = true;
-        if (this.rules) {
-            rules = this.rules[0].rules;
-            for (i = 0; i < rules.length; i++) {
-                if (rules[i].markReferenced) {
-                    rules[i].markReferenced();
-                }
-            }
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Element = function (combinator, value, index, currentFileInfo) {
-    this.combinator = combinator instanceof tree.Combinator ?
-                      combinator : new(tree.Combinator)(combinator);
-
-    if (typeof(value) === 'string') {
-        this.value = value.trim();
-    } else if (value) {
-        this.value = value;
-    } else {
-        this.value = "";
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Element.prototype = {
-    type: "Element",
-    accept: function (visitor) {
-        var value = this.value;
-        this.combinator = visitor.visit(this.combinator);
-        if (typeof value === "object") {
-            this.value = visitor.visit(value);
-        }
-    },
-    eval: function (env) {
-        return new(tree.Element)(this.combinator,
-                                 this.value.eval ? this.value.eval(env) : this.value,
-                                 this.index,
-                                 this.currentFileInfo);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env), this.currentFileInfo, this.index);
-    },
-    toCSS: function (env) {
-        var value = (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        if (value === '' && this.combinator.value.charAt(0) === '&') {
-            return '';
-        } else {
-            return this.combinator.toCSS(env || {}) + value;
-        }
-    }
-};
-
-tree.Attribute = function (key, op, value) {
-    this.key = key;
-    this.op = op;
-    this.value = value;
-};
-tree.Attribute.prototype = {
-    type: "Attribute",
-    eval: function (env) {
-        return new(tree.Attribute)(this.key.eval ? this.key.eval(env) : this.key,
-            this.op, (this.value && this.value.eval) ? this.value.eval(env) : this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env) {
-        var value = this.key.toCSS ? this.key.toCSS(env) : this.key;
-
-        if (this.op) {
-            value += this.op;
-            value += (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        }
-
-        return '[' + value + ']';
-    }
-};
-
-tree.Combinator = function (value) {
-    if (value === ' ') {
-        this.value = ' ';
-    } else {
-        this.value = value ? value.trim() : "";
-    }
-};
-tree.Combinator.prototype = {
-    type: "Combinator",
-    _outputMap: {
-        ''  : '',
-        ' ' : ' ',
-        ':' : ' :',
-        '+' : ' + ',
-        '~' : ' ~ ',
-        '>' : ' > ',
-        '|' : '|',
-        '^' : ' ^ ',
-        '^^' : ' ^^ '
-    },
-    _outputMapCompressed: {
-        ''  : '',
-        ' ' : ' ',
-        ':' : ' :',
-        '+' : '+',
-        '~' : '~',
-        '>' : '>',
-        '|' : '|',
-        '^' : '^',
-        '^^' : '^^'
-    },
-    genCSS: function (env, output) {
-        output.add((env.compress ? this._outputMapCompressed : this._outputMap)[this.value]);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Expression = function (value) { this.value = value; };
-tree.Expression.prototype = {
-    type: "Expression",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        var returnValue,
-            inParenthesis = this.parens && !this.parensInOp,
-            doubleParen = false;
-        if (inParenthesis) {
-            env.inParenthesis();
-        }
-        if (this.value.length > 1) {
-            returnValue = new(tree.Expression)(this.value.map(function (e) {
-                return e.eval(env);
-            }));
-        } else if (this.value.length === 1) {
-            if (this.value[0].parens && !this.value[0].parensInOp) {
-                doubleParen = true;
-            }
-            returnValue = this.value[0].eval(env);
-        } else {
-            returnValue = this;
-        }
-        if (inParenthesis) {
-            env.outOfParenthesis();
-        }
-        if (this.parens && this.parensInOp && !(env.isMathOn()) && !doubleParen) {
-            returnValue = new(tree.Paren)(returnValue);
-        }
-        return returnValue;
-    },
-    genCSS: function (env, output) {
-        for(var i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i + 1 < this.value.length) {
-                output.add(" ");
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    throwAwayComments: function () {
-        this.value = this.value.filter(function(v) {
-            return !(v instanceof tree.Comment);
-        });
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Extend = function Extend(selector, option, index) {
-    this.selector = selector;
-    this.option = option;
-    this.index = index;
-    this.object_id = tree.Extend.next_id++;
-    this.parent_ids = [this.object_id];
-
-    switch(option) {
-        case "all":
-            this.allowBefore = true;
-            this.allowAfter = true;
-        break;
-        default:
-            this.allowBefore = false;
-            this.allowAfter = false;
-        break;
-    }
-};
-tree.Extend.next_id = 0;
-
-tree.Extend.prototype = {
-    type: "Extend",
-    accept: function (visitor) {
-        this.selector = visitor.visit(this.selector);
-    },
-    eval: function (env) {
-        return new(tree.Extend)(this.selector.eval(env), this.option, this.index);
-    },
-    clone: function (env) {
-        return new(tree.Extend)(this.selector, this.option, this.index);
-    },
-    findSelfSelectors: function (selectors) {
-        var selfElements = [],
-            i,
-            selectorElements;
-
-        for(i = 0; i < selectors.length; i++) {
-            selectorElements = selectors[i].elements;
-            // duplicate the logic in genCSS function inside the selector node.
-            // future TODO - move both logics into the selector joiner visitor
-            if (i > 0 && selectorElements.length && selectorElements[0].combinator.value === "") {
-                selectorElements[0].combinator.value = ' ';
-            }
-            selfElements = selfElements.concat(selectors[i].elements);
-        }
-
-        this.selfSelectors = [{ elements: selfElements }];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// CSS @import node
-//
-// The general strategy here is that we don't want to wait
-// for the parsing to be completed, before we start importing
-// the file. That's because in the context of a browser,
-// most of the time will be spent waiting for the server to respond.
-//
-// On creation, we push the import path to our import queue, though
-// `import,push`, we also pass it a callback, which it'll call once
-// the file has been fetched, and parsed.
-//
-tree.Import = function (path, features, options, index, currentFileInfo) {
-    this.options = options;
-    this.index = index;
-    this.path = path;
-    this.features = features;
-    this.currentFileInfo = currentFileInfo;
-
-    if (this.options.less !== undefined || this.options.inline) {
-        this.css = !this.options.less || this.options.inline;
-    } else {
-        var pathValue = this.getPath();
-        if (pathValue && /css([\?;].*)?$/.test(pathValue)) {
-            this.css = true;
-        }
-    }
-};
-
-//
-// The actual import node doesn't return anything, when converted to CSS.
-// The reason is that it's used at the evaluation stage, so that the rules
-// it imports can be treated like any other rules.
-//
-// In `eval`, we make sure all Import nodes get evaluated, recursively, so
-// we end up with a flat structure, which can easily be imported in the parent
-// ruleset.
-//
-tree.Import.prototype = {
-    type: "Import",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        this.path = visitor.visit(this.path);
-        if (!this.options.inline && this.root) {
-            this.root = visitor.visit(this.root);
-        }
-    },
-    genCSS: function (env, output) {
-        if (this.css) {
-            output.add("@import ", this.currentFileInfo, this.index);
-            this.path.genCSS(env, output);
-            if (this.features) {
-                output.add(" ");
-                this.features.genCSS(env, output);
-            }
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    getPath: function () {
-        if (this.path instanceof tree.Quoted) {
-            var path = this.path.value;
-            return (this.css !== undefined || /(\.[a-z]*$)|([\?;].*)$/.test(path)) ? path : path + '.less';
-        } else if (this.path instanceof tree.URL) {
-            return this.path.value.value;
-        }
-        return null;
-    },
-    evalForImport: function (env) {
-        return new(tree.Import)(this.path.eval(env), this.features, this.options, this.index, this.currentFileInfo);
-    },
-    evalPath: function (env) {
-        var path = this.path.eval(env);
-        var rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-
-        if (!(path instanceof tree.URL)) {
-            if (rootpath) {
-                var pathValue = path.value;
-                // Add the base path if the import is relative
-                if (pathValue && env.isPathRelative(pathValue)) {
-                    path.value = rootpath +pathValue;
-                }
-            }
-            path.value = env.normalizePath(path.value);
-        }
-
-        return path;
-    },
-    eval: function (env) {
-        var ruleset, features = this.features && this.features.eval(env);
-
-        if (this.skip) { return []; }
-
-        if (this.options.inline) {
-            //todo needs to reference css file not import
-            var contents = new(tree.Anonymous)(this.root, 0, {filename: this.importedFilename}, true);
-            return this.features ? new(tree.Media)([contents], this.features.value) : [contents];
-        } else if (this.css) {
-            var newImport = new(tree.Import)(this.evalPath(env), features, this.options, this.index);
-            if (!newImport.css && this.error) {
-                throw this.error;
-            }
-            return newImport;
-        } else {
-            ruleset = new(tree.Ruleset)(null, this.root.rules.slice(0));
-
-            ruleset.evalImports(env);
-
-            return this.features ? new(tree.Media)(ruleset.rules, this.features.value) : ruleset.rules;
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.JavaScript = function (string, index, escaped) {
-    this.escaped = escaped;
-    this.expression = string;
-    this.index = index;
-};
-tree.JavaScript.prototype = {
-    type: "JavaScript",
-    eval: function (env) {
-        var result,
-            that = this,
-            context = {};
-
-        var expression = this.expression.replace(/@\{([\w-]+)\}/g, function (_, name) {
-            return tree.jsify(new(tree.Variable)('@' + name, that.index).eval(env));
-        });
-
-        try {
-            expression = new(Function)('return (' + expression + ')');
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: " + e.message + " from `" + expression + "`" ,
-                    index: this.index };
-        }
-
-        var variables = env.frames[0].variables();
-        for (var k in variables) {
-            if (variables.hasOwnProperty(k)) {
-                /*jshint loopfunc:true */
-                context[k.slice(1)] = {
-                    value: variables[k].value,
-                    toJS: function () {
-                        return this.value.eval(env).toCSS();
-                    }
-                };
-            }
-        }
-
-        try {
-            result = expression.call(context);
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: '" + e.name + ': ' + e.message.replace(/["]/g, "'") + "'" ,
-                    index: this.index };
-        }
-        if (typeof(result) === 'number') {
-            return new(tree.Dimension)(result);
-        } else if (typeof(result) === 'string') {
-            return new(tree.Quoted)('"' + result + '"', result, this.escaped, this.index);
-        } else if (Array.isArray(result)) {
-            return new(tree.Anonymous)(result.join(', '));
-        } else {
-            return new(tree.Anonymous)(result);
-        }
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Keyword = function (value) { this.value = value; };
-tree.Keyword.prototype = {
-    type: "Keyword",
-    eval: function () { return this; },
-    genCSS: function (env, output) {
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    compare: function (other) {
-        if (other instanceof tree.Keyword) {
-            return other.value === this.value ? 0 : 1;
-        } else {
-            return -1;
-        }
-    }
-};
-
-tree.True = new(tree.Keyword)('true');
-tree.False = new(tree.Keyword)('false');
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Media = function (value, features, index, currentFileInfo) {
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-
-    var selectors = this.emptySelectors();
-
-    this.features = new(tree.Value)(features);
-    this.rules = [new(tree.Ruleset)(selectors, value)];
-    this.rules[0].allowImports = true;
-};
-tree.Media.prototype = {
-    type: "Media",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        if (this.rules) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    genCSS: function (env, output) {
-        output.add('@media ', this.currentFileInfo, this.index);
-        this.features.genCSS(env, output);
-        tree.outputRuleset(env, output, this.rules);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (!env.mediaBlocks) {
-            env.mediaBlocks = [];
-            env.mediaPath = [];
-        }
-
-        var media = new(tree.Media)(null, [], this.index, this.currentFileInfo);
-        if(this.debugInfo) {
-            this.rules[0].debugInfo = this.debugInfo;
-            media.debugInfo = this.debugInfo;
-        }
-        var strictMathBypass = false;
-        if (!env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            media.features = this.features.eval(env);
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-
-        env.mediaPath.push(media);
-        env.mediaBlocks.push(media);
-
-        env.frames.unshift(this.rules[0]);
-        media.rules = [this.rules[0].eval(env)];
-        env.frames.shift();
-
-        env.mediaPath.pop();
-
-        return env.mediaPath.length === 0 ? media.evalTop(env) :
-                    media.evalNested(env);
-    },
-    variable: function (name) { return tree.Ruleset.prototype.variable.call(this.rules[0], name); },
-    find: function () { return tree.Ruleset.prototype.find.apply(this.rules[0], arguments); },
-    rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.rules[0]); },
-    emptySelectors: function() {
-        var el = new(tree.Element)('', '&', this.index, this.currentFileInfo),
-            sels = [new(tree.Selector)([el], null, null, this.index, this.currentFileInfo)];
-        sels[0].mediaEmpty = true;
-        return sels;
-    },
-    markReferenced: function () {
-        var i, rules = this.rules[0].rules;
-        this.isReferenced = true;
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i].markReferenced) {
-                rules[i].markReferenced();
-            }
-        }
-    },
-
-    evalTop: function (env) {
-        var result = this;
-
-        // Render all dependent Media blocks.
-        if (env.mediaBlocks.length > 1) {
-            var selectors = this.emptySelectors();
-            result = new(tree.Ruleset)(selectors, env.mediaBlocks);
-            result.multiMedia = true;
-        }
-
-        delete env.mediaBlocks;
-        delete env.mediaPath;
-
-        return result;
-    },
-    evalNested: function (env) {
-        var i, value,
-            path = env.mediaPath.concat([this]);
-
-        // Extract the media-query conditions separated with `,` (OR).
-        for (i = 0; i < path.length; i++) {
-            value = path[i].features instanceof tree.Value ?
-                        path[i].features.value : path[i].features;
-            path[i] = Array.isArray(value) ? value : [value];
-        }
-
-        // Trace all permutations to generate the resulting media-query.
-        //
-        // (a, b and c) with nested (d, e) ->
-        //    a and d
-        //    a and e
-        //    b and c and d
-        //    b and c and e
-        this.features = new(tree.Value)(this.permute(path).map(function (path) {
-            path = path.map(function (fragment) {
-                return fragment.toCSS ? fragment : new(tree.Anonymous)(fragment);
-            });
-
-            for(i = path.length - 1; i > 0; i--) {
-                path.splice(i, 0, new(tree.Anonymous)("and"));
-            }
-
-            return new(tree.Expression)(path);
-        }));
-
-        // Fake a tree-node that doesn't output anything.
-        return new(tree.Ruleset)([], []);
-    },
-    permute: function (arr) {
-      if (arr.length === 0) {
-          return [];
-      } else if (arr.length === 1) {
-          return arr[0];
-      } else {
-          var result = [];
-          var rest = this.permute(arr.slice(1));
-          for (var i = 0; i < rest.length; i++) {
-              for (var j = 0; j < arr[0].length; j++) {
-                  result.push([arr[0][j]].concat(rest[i]));
-              }
-          }
-          return result;
-      }
-    },
-    bubbleSelectors: function (selectors) {
-      this.rules = [new(tree.Ruleset)(selectors.slice(0), [this.rules[0]])];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.mixin = {};
-tree.mixin.Call = function (elements, args, index, currentFileInfo, important) {
-    this.selector = new(tree.Selector)(elements);
-    this.arguments = (args && args.length) ? args : null;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.important = important;
-};
-tree.mixin.Call.prototype = {
-    type: "MixinCall",
-    accept: function (visitor) {
-        if (this.selector) {
-            this.selector = visitor.visit(this.selector);
-        }
-        if (this.arguments) {
-            this.arguments = visitor.visitArray(this.arguments);
-        }
-    },
-    eval: function (env) {
-        var mixins, mixin, args, rules = [], match = false, i, m, f, isRecursive, isOneFound, rule,
-            candidates = [], candidate, conditionResult = [], defaultFunc = tree.defaultFunc,
-            defaultResult, defNone = 0, defTrue = 1, defFalse = 2, count;
-
-        args = this.arguments && this.arguments.map(function (a) {
-            return { name: a.name, value: a.value.eval(env) };
-        });
-
-        for (i = 0; i < env.frames.length; i++) {
-            if ((mixins = env.frames[i].find(this.selector)).length > 0) {
-                isOneFound = true;
-
-                // To make `default()` function independent of definition order we have two "subpasses" here.
-                // At first we evaluate each guard *twice* (with `default() == true` and `default() == false`),
-                // and build candidate list with corresponding flags. Then, when we know all possible matches,
-                // we make a final decision.
-
-                for (m = 0; m < mixins.length; m++) {
-                    mixin = mixins[m];
-                    isRecursive = false;
-                    for(f = 0; f < env.frames.length; f++) {
-                        if ((!(mixin instanceof tree.mixin.Definition)) && mixin === (env.frames[f].originalRuleset || env.frames[f])) {
-                            isRecursive = true;
-                            break;
-                        }
-                    }
-                    if (isRecursive) {
-                        continue;
-                    }
-
-                    if (mixin.matchArgs(args, env)) {
-                        candidate = {mixin: mixin, group: defNone};
-
-                        if (mixin.matchCondition) {
-                            for (f = 0; f < 2; f++) {
-                                defaultFunc.value(f);
-                                conditionResult[f] = mixin.matchCondition(args, env);
-                            }
-                            if (conditionResult[0] || conditionResult[1]) {
-                                if (conditionResult[0] != conditionResult[1]) {
-                                    candidate.group = conditionResult[1] ?
-                                        defTrue : defFalse;
-                                }
-
-                                candidates.push(candidate);
-                            }
-                        }
-                        else {
-                            candidates.push(candidate);
-                        }
-
-                        match = true;
-                    }
-                }
-
-                defaultFunc.reset();
-
-                count = [0, 0, 0];
-                for (m = 0; m < candidates.length; m++) {
-                    count[candidates[m].group]++;
-                }
-
-                if (count[defNone] > 0) {
-                    defaultResult = defFalse;
-                } else {
-                    defaultResult = defTrue;
-                    if ((count[defTrue] + count[defFalse]) > 1) {
-                        throw { type: 'Runtime',
-                            message: 'Ambiguous use of `default()` found when matching for `'
-                                + this.format(args) + '`',
-                            index: this.index, filename: this.currentFileInfo.filename };
-                    }
-                }
-
-                for (m = 0; m < candidates.length; m++) {
-                    candidate = candidates[m].group;
-                    if ((candidate === defNone) || (candidate === defaultResult)) {
-                        try {
-                            mixin = candidates[m].mixin;
-                            if (!(mixin instanceof tree.mixin.Definition)) {
-                                mixin = new tree.mixin.Definition("", [], mixin.rules, null, false);
-                                mixin.originalRuleset = mixins[m].originalRuleset || mixins[m];
-                            }
-                            Array.prototype.push.apply(
-                                  rules, mixin.eval(env, args, this.important).rules);
-                        } catch (e) {
-                            throw { message: e.message, index: this.index, filename: this.currentFileInfo.filename, stack: e.stack };
-                        }
-                    }
-                }
-
-                if (match) {
-                    if (!this.currentFileInfo || !this.currentFileInfo.reference) {
-                        for (i = 0; i < rules.length; i++) {
-                            rule = rules[i];
-                            if (rule.markReferenced) {
-                                rule.markReferenced();
-                            }
-                        }
-                    }
-                    return rules;
-                }
-            }
-        }
-        if (isOneFound) {
-            throw { type:    'Runtime',
-                    message: 'No matching definition was found for `' + this.format(args) + '`',
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        } else {
-            throw { type:    'Name',
-                    message: this.selector.toCSS().trim() + " is undefined",
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        }
-    },
-    format: function (args) {
-        return this.selector.toCSS().trim() + '(' +
-            (args ? args.map(function (a) {
-                var argValue = "";
-                if (a.name) {
-                    argValue += a.name + ":";
-                }
-                if (a.value.toCSS) {
-                    argValue += a.value.toCSS();
-                } else {
-                    argValue += "???";
-                }
-                return argValue;
-            }).join(', ') : "") + ")";
-    }
-};
-
-tree.mixin.Definition = function (name, params, rules, condition, variadic) {
-    this.name = name;
-    this.selectors = [new(tree.Selector)([new(tree.Element)(null, name, this.index, this.currentFileInfo)])];
-    this.params = params;
-    this.condition = condition;
-    this.variadic = variadic;
-    this.arity = params.length;
-    this.rules = rules;
-    this._lookups = {};
-    this.required = params.reduce(function (count, p) {
-        if (!p.name || (p.name && !p.value)) { return count + 1; }
-        else                                 { return count; }
-    }, 0);
-    this.parent = tree.Ruleset.prototype;
-    this.frames = [];
-};
-tree.mixin.Definition.prototype = {
-    type: "MixinDefinition",
-    accept: function (visitor) {
-        if (this.params && this.params.length) {
-            this.params = visitor.visitArray(this.params);
-        }
-        this.rules = visitor.visitArray(this.rules);
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    variable:  function (name) { return this.parent.variable.call(this, name); },
-    variables: function ()     { return this.parent.variables.call(this); },
-    find:      function ()     { return this.parent.find.apply(this, arguments); },
-    rulesets:  function ()     { return this.parent.rulesets.apply(this); },
-
-    evalParams: function (env, mixinEnv, args, evaldArguments) {
-        /*jshint boss:true */
-        var frame = new(tree.Ruleset)(null, null),
-            varargs, arg,
-            params = this.params.slice(0),
-            i, j, val, name, isNamedFound, argIndex;
-
-        mixinEnv = new tree.evalEnv(mixinEnv, [frame].concat(mixinEnv.frames));
-
-        if (args) {
-            args = args.slice(0);
-
-            for(i = 0; i < args.length; i++) {
-                arg = args[i];
-                if (name = (arg && arg.name)) {
-                    isNamedFound = false;
-                    for(j = 0; j < params.length; j++) {
-                        if (!evaldArguments[j] && name === params[j].name) {
-                            evaldArguments[j] = arg.value.eval(env);
-                            frame.prependRule(new(tree.Rule)(name, arg.value.eval(env)));
-                            isNamedFound = true;
-                            break;
-                        }
-                    }
-                    if (isNamedFound) {
-                        args.splice(i, 1);
-                        i--;
-                        continue;
-                    } else {
-                        throw { type: 'Runtime', message: "Named argument for " + this.name +
-                            ' ' + args[i].name + ' not found' };
-                    }
-                }
-            }
-        }
-        argIndex = 0;
-        for (i = 0; i < params.length; i++) {
-            if (evaldArguments[i]) { continue; }
-
-            arg = args && args[argIndex];
-
-            if (name = params[i].name) {
-                if (params[i].variadic && args) {
-                    varargs = [];
-                    for (j = argIndex; j < args.length; j++) {
-                        varargs.push(args[j].value.eval(env));
-                    }
-                    frame.prependRule(new(tree.Rule)(name, new(tree.Expression)(varargs).eval(env)));
-                } else {
-                    val = arg && arg.value;
-                    if (val) {
-                        val = val.eval(env);
-                    } else if (params[i].value) {
-                        val = params[i].value.eval(mixinEnv);
-                        frame.resetCache();
-                    } else {
-                        throw { type: 'Runtime', message: "wrong number of arguments for " + this.name +
-                            ' (' + args.length + ' for ' + this.arity + ')' };
-                    }
-
-                    frame.prependRule(new(tree.Rule)(name, val));
-                    evaldArguments[i] = val;
-                }
-            }
-
-            if (params[i].variadic && args) {
-                for (j = argIndex; j < args.length; j++) {
-                    evaldArguments[j] = args[j].value.eval(env);
-                }
-            }
-            argIndex++;
-        }
-
-        return frame;
-    },
-    eval: function (env, args, important) {
-        var _arguments = [],
-            mixinFrames = this.frames.concat(env.frames),
-            frame = this.evalParams(env, new(tree.evalEnv)(env, mixinFrames), args, _arguments),
-            rules, ruleset;
-
-        frame.prependRule(new(tree.Rule)('@arguments', new(tree.Expression)(_arguments).eval(env)));
-
-        rules = this.rules.slice(0);
-
-        ruleset = new(tree.Ruleset)(null, rules);
-        ruleset.originalRuleset = this;
-        ruleset = ruleset.eval(new(tree.evalEnv)(env, [this, frame].concat(mixinFrames)));
-        if (important) {
-            ruleset = this.parent.makeImportant.apply(ruleset);
-        }
-        return ruleset;
-    },
-    matchCondition: function (args, env) {
-        if (this.condition && !this.condition.eval(
-            new(tree.evalEnv)(env,
-                [this.evalParams(env, new(tree.evalEnv)(env, this.frames.concat(env.frames)), args, [])] // the parameter variables
-                    .concat(this.frames) // the parent namespace/mixin frames
-                    .concat(env.frames)))) { // the current environment frames
-            return false;
-        }
-        return true;
-    },
-    matchArgs: function (args, env) {
-        var argsLength = (args && args.length) || 0, len;
-
-        if (! this.variadic) {
-            if (argsLength < this.required)                               { return false; }
-            if (argsLength > this.params.length)                          { return false; }
-        } else {
-            if (argsLength < (this.required - 1))                         { return false; }
-        }
-
-        len = Math.min(argsLength, this.arity);
-
-        for (var i = 0; i < len; i++) {
-            if (!this.params[i].name && !this.params[i].variadic) {
-                if (args[i].value.eval(env).toCSS() != this.params[i].value.eval(env).toCSS()) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Negative = function (node) {
-    this.value = node;
-};
-tree.Negative.prototype = {
-    type: "Negative",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('-');
-        this.value.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (env.isMathOn()) {
-            return (new(tree.Operation)('*', [new(tree.Dimension)(-1), this.value])).eval(env);
-        }
-        return new(tree.Negative)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Operation = function (op, operands, isSpaced) {
-    this.op = op.trim();
-    this.operands = operands;
-    this.isSpaced = isSpaced;
-};
-tree.Operation.prototype = {
-    type: "Operation",
-    accept: function (visitor) {
-        this.operands = visitor.visit(this.operands);
-    },
-    eval: function (env) {
-        var a = this.operands[0].eval(env),
-            b = this.operands[1].eval(env);
-
-        if (env.isMathOn()) {
-            if (a instanceof tree.Dimension && b instanceof tree.Color) {
-                a = a.toColor();
-            }
-            if (b instanceof tree.Dimension && a instanceof tree.Color) {
-                b = b.toColor();
-            }
-            if (!a.operate) {
-                throw { type: "Operation",
-                        message: "Operation on an invalid type" };
-            }
-
-            return a.operate(env, this.op, b);
-        } else {
-            return new(tree.Operation)(this.op, [a, b], this.isSpaced);
-        }
-    },
-    genCSS: function (env, output) {
-        this.operands[0].genCSS(env, output);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        output.add(this.op);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        this.operands[1].genCSS(env, output);
-    },
-    toCSS: tree.toCSS
-};
-
-tree.operate = function (env, op, a, b) {
-    switch (op) {
-        case '+': return a + b;
-        case '-': return a - b;
-        case '*': return a * b;
-        case '/': return a / b;
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Paren = function (node) {
-    this.value = node;
-};
-tree.Paren.prototype = {
-    type: "Paren",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('(');
-        this.value.genCSS(env, output);
-        output.add(')');
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        return new(tree.Paren)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Quoted = function (str, content, escaped, index, currentFileInfo) {
-    this.escaped = escaped;
-    this.value = content || '';
-    this.quote = str.charAt(0);
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Quoted.prototype = {
-    type: "Quoted",
-    genCSS: function (env, output) {
-        if (!this.escaped) {
-            output.add(this.quote, this.currentFileInfo, this.index);
-        }
-        output.add(this.value);
-        if (!this.escaped) {
-            output.add(this.quote);
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var that = this;
-        var value = this.value.replace(/`([^`]+)`/g, function (_, exp) {
-            return new(tree.JavaScript)(exp, that.index, true).eval(env).value;
-        }).replace(/@\{([\w-]+)\}/g, function (_, name) {
-            var v = new(tree.Variable)('@' + name, that.index, that.currentFileInfo).eval(env, true);
-            return (v instanceof tree.Quoted) ? v.value : v.toCSS();
-        });
-        return new(tree.Quoted)(this.quote + value + this.quote, value, this.escaped, this.index, this.currentFileInfo);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left = this.toCSS(),
-            right = x.toCSS();
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Rule = function (name, value, important, merge, index, currentFileInfo, inline) {
-    this.name = name;
-    this.value = (value instanceof tree.Value) ? value : new(tree.Value)([value]);
-    this.important = important ? ' ' + important.trim() : '';
-    this.merge = merge;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.inline = inline || false;
-    this.variable = name.charAt && (name.charAt(0) === '@');
-};
-
-tree.Rule.prototype = {
-    type: "Rule",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.name + (env.compress ? ':' : ': '), this.currentFileInfo, this.index);
-        try {
-            this.value.genCSS(env, output);
-        }
-        catch(e) {
-            e.index = this.index;
-            e.filename = this.currentFileInfo.filename;
-            throw e;
-        }
-        output.add(this.important + ((this.inline || (env.lastRule && env.compress)) ? "" : ";"), this.currentFileInfo, this.index);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var strictMathBypass = false, name = this.name;
-        if (typeof name !== "string") {
-            // expand 'primitive' name directly to get
-            // things faster (~10% for benchmark.less):
-            name = (name.length === 1)
-                && (name[0] instanceof tree.Keyword)
-                    ? name[0].value : evalName(env, name);
-        }
-        if (name === "font" && !env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            return new(tree.Rule)(name,
-                              this.value.eval(env),
-                              this.important,
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline);
-        }
-        catch(e) {
-            e.index = e.index || this.index;
-            throw e;
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-    },
-    makeImportant: function () {
-        return new(tree.Rule)(this.name,
-                              this.value,
-                              "!important",
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline);
-    }
-};
-
-function evalName(env, name) {
-    var value = "", i, n = name.length,
-        output = {add: function (s) {value += s;}};
-    for (i = 0; i < n; i++) {
-        name[i].eval(env).genCSS(env, output);
-    }
-    return value;
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Ruleset = function (selectors, rules, strictImports) {
-    this.selectors = selectors;
-    this.rules = rules;
-    this._lookups = {};
-    this.strictImports = strictImports;
-};
-tree.Ruleset.prototype = {
-    type: "Ruleset",
-    accept: function (visitor) {
-        if (this.paths) {
-            visitor.visitArray(this.paths, true);
-        } else if (this.selectors) {
-            this.selectors = visitor.visitArray(this.selectors);
-        }
-        if (this.rules && this.rules.length) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    eval: function (env) {
-        var thisSelectors = this.selectors, selectors,
-            selCnt, i, defaultFunc = tree.defaultFunc;
-        if (thisSelectors && (selCnt = thisSelectors.length)) {
-            selectors = [];
-            defaultFunc.error({
-                type: "Syntax",
-                message: "it is currently only allowed in parametric mixin guards,"
-            });
-            for (i = 0; i < selCnt; i++) {
-                selectors.push(thisSelectors[i].eval(env));
-            }
-            defaultFunc.reset();
-        }
-
-        var rules = this.rules ? this.rules.slice(0) : null,
-            ruleset = new(tree.Ruleset)(selectors, rules, this.strictImports),
-            rule, subRule;
-
-        ruleset.originalRuleset = this;
-        ruleset.root = this.root;
-        ruleset.firstRoot = this.firstRoot;
-        ruleset.allowImports = this.allowImports;
-
-        if(this.debugInfo) {
-            ruleset.debugInfo = this.debugInfo;
-        }
-
-        // push the current ruleset to the frames stack
-        var envFrames = env.frames;
-        envFrames.unshift(ruleset);
-
-        // currrent selectors
-        var envSelectors = env.selectors;
-        if (!envSelectors) {
-            env.selectors = envSelectors = [];
-        }
-        envSelectors.unshift(this.selectors);
-
-        // Evaluate imports
-        if (ruleset.root || ruleset.allowImports || !ruleset.strictImports) {
-            ruleset.evalImports(env);
-        }
-
-        // Store the frames around mixin definitions,
-        // so they can be evaluated like closures when the time comes.
-        var rsRules = ruleset.rules, rsRuleCnt = rsRules ? rsRules.length : 0;
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Definition) {
-                rsRules[i].frames = envFrames.slice(0);
-            }
-        }
-
-        var mediaBlockCount = (env.mediaBlocks && env.mediaBlocks.length) || 0;
-
-        // Evaluate mixin calls.
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Call) {
-                /*jshint loopfunc:true */
-                rules = rsRules[i].eval(env).filter(function(r) {
-                    if ((r instanceof tree.Rule) && r.variable) {
-                        // do not pollute the scope if the variable is
-                        // already there. consider returning false here
-                        // but we need a way to "return" variable from mixins
-                        return !(ruleset.variable(r.name));
-                    }
-                    return true;
-                });
-                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
-                rsRuleCnt += rules.length - 1;
-                i += rules.length-1;
-                ruleset.resetCache();
-            }
-        }
-
-        // Evaluate everything else
-        for (i = 0; i < rsRules.length; i++) {
-            rule = rsRules[i];
-            if (! (rule instanceof tree.mixin.Definition)) {
-                rsRules[i] = rule = rule.eval ? rule.eval(env) : rule;
-                // for rulesets, check if it is a css guard and can be removed
-                if (rule instanceof tree.Ruleset && rule.selectors && rule.selectors.length === 1) {
-                    // check if it can be folded in (e.g. & where)
-                    if (rule.selectors[0].isJustParentSelector()) {
-                        rsRules.splice(i--, 1);
-                        // cannot call if there is no selector, so we can just continue
-                        if (!rule.selectors[0].evaldCondition) {
-                            continue;
-                        }
-                        for(var j = 0; j < rule.rules.length; j++) {
-                            subRule = rule.rules[j];
-                            if (!(subRule instanceof tree.Rule) || !subRule.variable) {
-                                rsRules.splice(++i, 0, subRule);
-                            }
-                        }
-                    }
-                }
-            }
-        }
-
-        // Pop the stack
-        envFrames.shift();
-        envSelectors.shift();
-
-        if (env.mediaBlocks) {
-            for (i = mediaBlockCount; i < env.mediaBlocks.length; i++) {
-                env.mediaBlocks[i].bubbleSelectors(selectors);
-            }
-        }
-
-        return ruleset;
-    },
-    evalImports: function(env) {
-        var rules = this.rules, i, importRules;
-        if (!rules) { return; }
-
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i] instanceof tree.Import) {
-                importRules = rules[i].eval(env);
-                if (importRules && importRules.length) {
-                    rules.splice.apply(rules, [i, 1].concat(importRules));
-                    i+= importRules.length-1;
-                } else {
-                    rules.splice(i, 1, importRules);
-                }
-                this.resetCache();
-            }
-        }
-    },
-    makeImportant: function() {
-        return new tree.Ruleset(this.selectors, this.rules.map(function (r) {
-                    if (r.makeImportant) {
-                        return r.makeImportant();
-                    } else {
-                        return r;
-                    }
-                }), this.strictImports);
-    },
-    matchArgs: function (args) {
-        return !args || args.length === 0;
-    },
-    // lets you call a css selector with a guard
-    matchCondition: function (args, env) {
-        var lastSelector = this.selectors[this.selectors.length-1];
-        if (!lastSelector.evaldCondition) {
-            return false;
-        }
-        if (lastSelector.condition &&
-            !lastSelector.condition.eval(
-                new(tree.evalEnv)(env,
-                    env.frames))) {
-            return false;
-        }
-        return true;
-    },
-    resetCache: function () {
-        this._rulesets = null;
-        this._variables = null;
-        this._lookups = {};
-    },
-    variables: function () {
-        if (!this._variables) {
-            this._variables = !this.rules ? {} : this.rules.reduce(function (hash, r) {
-                if (r instanceof tree.Rule && r.variable === true) {
-                    hash[r.name] = r;
-                }
-                return hash;
-            }, {});
-        }
-        return this._variables;
-    },
-    variable: function (name) {
-        return this.variables()[name];
-    },
-    rulesets: function () {
-        if (!this.rules) { return null; }
-
-        var _Ruleset = tree.Ruleset, _MixinDefinition = tree.mixin.Definition,
-            filtRules = [], rules = this.rules, cnt = rules.length,
-            i, rule;
-
-        for (i = 0; i < cnt; i++) {
-            rule = rules[i];
-            if ((rule instanceof _Ruleset) || (rule instanceof _MixinDefinition)) {
-                filtRules.push(rule);
-            }
-        }
-
-        return filtRules;
-    },
-    prependRule: function (rule) {
-        var rules = this.rules;
-        if (rules) { rules.unshift(rule); } else { this.rules = [ rule ]; }
-    },
-    find: function (selector, self) {
-        self = self || this;
-        var rules = [], match,
-            key = selector.toCSS();
-
-        if (key in this._lookups) { return this._lookups[key]; }
-
-        this.rulesets().forEach(function (rule) {
-            if (rule !== self) {
-                for (var j = 0; j < rule.selectors.length; j++) {
-                    match = selector.match(rule.selectors[j]);
-                    if (match) {
-                        if (selector.elements.length > match) {
-                            Array.prototype.push.apply(rules, rule.find(
-                                new(tree.Selector)(selector.elements.slice(match)), self));
-                        } else {
-                            rules.push(rule);
-                        }
-                        break;
-                    }
-                }
-            }
-        });
-        this._lookups[key] = rules;
-        return rules;
-    },
-    genCSS: function (env, output) {
-        var i, j,
-            ruleNodes = [],
-            rulesetNodes = [],
-            rulesetNodeCnt,
-            debugInfo,     // Line number debugging
-            rule,
-            path;
-
-        env.tabLevel = (env.tabLevel || 0);
-
-        if (!this.root) {
-            env.tabLevel++;
-        }
-
-        var tabRuleStr = env.compress ? '' : Array(env.tabLevel + 1).join("  "),
-            tabSetStr = env.compress ? '' : Array(env.tabLevel).join("  "),
-            sep;
-
-        for (i = 0; i < this.rules.length; i++) {
-            rule = this.rules[i];
-            if (rule.rules || (rule instanceof tree.Media) || rule instanceof tree.Directive || (this.root && rule instanceof tree.Comment)) {
-                rulesetNodes.push(rule);
-            } else {
-                ruleNodes.push(rule);
-            }
-        }
-
-        // If this is the root node, we don't render
-        // a selector, or {}.
-        if (!this.root) {
-            debugInfo = tree.debugInfo(env, this, tabSetStr);
-
-            if (debugInfo) {
-                output.add(debugInfo);
-                output.add(tabSetStr);
-            }
-
-            var paths = this.paths, pathCnt = paths.length,
-                pathSubCnt;
-
-            sep = env.compress ? ',' : (',\n' + tabSetStr);
-
-            for (i = 0; i < pathCnt; i++) {
-                path = paths[i];
-                if (!(pathSubCnt = path.length)) { continue; }
-                if (i > 0) { output.add(sep); }
-
-                env.firstSelector = true;
-                path[0].genCSS(env, output);
-
-                env.firstSelector = false;
-                for (j = 1; j < pathSubCnt; j++) {
-                    path[j].genCSS(env, output);
-                }
-            }
-
-            output.add((env.compress ? '{' : ' {\n') + tabRuleStr);
-        }
-
-        // Compile rules and rulesets
-        for (i = 0; i < ruleNodes.length; i++) {
-            rule = ruleNodes[i];
-
-            // @page{ directive ends up with root elements inside it, a mix of rules and rulesets
-            // In this instance we do not know whether it is the last property
-            if (i + 1 === ruleNodes.length && (!this.root || rulesetNodes.length === 0 || this.firstRoot)) {
-                env.lastRule = true;
-            }
-
-            if (rule.genCSS) {
-                rule.genCSS(env, output);
-            } else if (rule.value) {
-                output.add(rule.value.toString());
-            }
-
-            if (!env.lastRule) {
-                output.add(env.compress ? '' : ('\n' + tabRuleStr));
-            } else {
-                env.lastRule = false;
-            }
-        }
-
-        if (!this.root) {
-            output.add((env.compress ? '}' : '\n' + tabSetStr + '}'));
-            env.tabLevel--;
-        }
-
-        sep = (env.compress ? "" : "\n") + (this.root ? tabRuleStr : tabSetStr);
-        rulesetNodeCnt = rulesetNodes.length;
-        if (rulesetNodeCnt) {
-            if (ruleNodes.length && sep) { output.add(sep); }
-            rulesetNodes[0].genCSS(env, output);
-            for (i = 1; i < rulesetNodeCnt; i++) {
-                if (sep) { output.add(sep); }
-                rulesetNodes[i].genCSS(env, output);
-            }
-        }
-
-        if (!output.isEmpty() && !env.compress && this.firstRoot) {
-            output.add('\n');
-        }
-    },
-
-    toCSS: tree.toCSS,
-
-    markReferenced: function () {
-        for (var s = 0; s < this.selectors.length; s++) {
-            this.selectors[s].markReferenced();
-        }
-    },
-
-    joinSelectors: function (paths, context, selectors) {
-        for (var s = 0; s < selectors.length; s++) {
-            this.joinSelector(paths, context, selectors[s]);
-        }
-    },
-
-    joinSelector: function (paths, context, selector) {
-
-        var i, j, k,
-            hasParentSelector, newSelectors, el, sel, parentSel,
-            newSelectorPath, afterParentJoin, newJoinedSelector,
-            newJoinedSelectorEmpty, lastSelector, currentElements,
-            selectorsMultiplied;
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            if (el.value === '&') {
-                hasParentSelector = true;
-            }
-        }
-
-        if (!hasParentSelector) {
-            if (context.length > 0) {
-                for (i = 0; i < context.length; i++) {
-                    paths.push(context[i].concat(selector));
-                }
-            }
-            else {
-                paths.push([selector]);
-            }
-            return;
-        }
-
-        // The paths are [[Selector]]
-        // The first list is a list of comma seperated selectors
-        // The inner list is a list of inheritance seperated selectors
-        // e.g.
-        // .a, .b {
-        //   .c {
-        //   }
-        // }
-        // == [[.a] [.c]] [[.b] [.c]]
-        //
-
-        // the elements from the current selector so far
-        currentElements = [];
-        // the current list of new selectors to add to the path.
-        // We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
-        // by the parents
-        newSelectors = [[]];
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            // non parent reference elements just get added
-            if (el.value !== "&") {
-                currentElements.push(el);
-            } else {
-                // the new list of selectors to add
-                selectorsMultiplied = [];
-
-                // merge the current list of non parent selector elements
-                // on to the current list of selectors to add
-                if (currentElements.length > 0) {
-                    this.mergeElementsOnToSelectors(currentElements, newSelectors);
-                }
-
-                // loop through our current selectors
-                for (j = 0; j < newSelectors.length; j++) {
-                    sel = newSelectors[j];
-                    // if we don't have any parent paths, the & might be in a mixin so that it can be used
-                    // whether there are parents or not
-                    if (context.length === 0) {
-                        // the combinator used on el should now be applied to the next element instead so that
-                        // it is not lost
-                        if (sel.length > 0) {
-                            sel[0].elements = sel[0].elements.slice(0);
-                            sel[0].elements.push(new(tree.Element)(el.combinator, '', el.index, el.currentFileInfo));
-                        }
-                        selectorsMultiplied.push(sel);
-                    }
-                    else {
-                        // and the parent selectors
-                        for (k = 0; k < context.length; k++) {
-                            parentSel = context[k];
-                            // We need to put the current selectors
-                            // then join the last selector's elements on to the parents selectors
-
-                            // our new selector path
-                            newSelectorPath = [];
-                            // selectors from the parent after the join
-                            afterParentJoin = [];
-                            newJoinedSelectorEmpty = true;
-
-                            //construct the joined selector - if & is the first thing this will be empty,
-                            // if not newJoinedSelector will be the last set of elements in the selector
-                            if (sel.length > 0) {
-                                newSelectorPath = sel.slice(0);
-                                lastSelector = newSelectorPath.pop();
-                                newJoinedSelector = selector.createDerived(lastSelector.elements.slice(0));
-                                newJoinedSelectorEmpty = false;
-                            }
-                            else {
-                                newJoinedSelector = selector.createDerived([]);
-                            }
-
-                            //put together the parent selectors after the join
-                            if (parentSel.length > 1) {
-                                afterParentJoin = afterParentJoin.concat(parentSel.slice(1));
-                            }
-
-                            if (parentSel.length > 0) {
-                                newJoinedSelectorEmpty = false;
-
-                                // join the elements so far with the first part of the parent
-                                newJoinedSelector.elements.push(new(tree.Element)(el.combinator, parentSel[0].elements[0].value, el.index, el.currentFileInfo));
-                                newJoinedSelector.elements = newJoinedSelector.elements.concat(parentSel[0].elements.slice(1));
-                            }
-
-                            if (!newJoinedSelectorEmpty) {
-                                // now add the joined selector
-                                newSelectorPath.push(newJoinedSelector);
-                            }
-
-                            // and the rest of the parent
-                            newSelectorPath = newSelectorPath.concat(afterParentJoin);
-
-                            // add that to our new set of selectors
-                            selectorsMultiplied.push(newSelectorPath);
-                        }
-                    }
-                }
-
-                // our new selectors has been multiplied, so reset the state
-                newSelectors = selectorsMultiplied;
-                currentElements = [];
-            }
-        }
-
-        // if we have any elements left over (e.g. .a& .b == .b)
-        // add them on to all the current selectors
-        if (currentElements.length > 0) {
-            this.mergeElementsOnToSelectors(currentElements, newSelectors);
-        }
-
-        for (i = 0; i < newSelectors.length; i++) {
-            if (newSelectors[i].length > 0) {
-                paths.push(newSelectors[i]);
-            }
-        }
-    },
-
-    mergeElementsOnToSelectors: function(elements, selectors) {
-        var i, sel;
-
-        if (selectors.length === 0) {
-            selectors.push([ new(tree.Selector)(elements) ]);
-            return;
-        }
-
-        for (i = 0; i < selectors.length; i++) {
-            sel = selectors[i];
-
-            // if the previous thing in sel is a parent this needs to join on to it
-            if (sel.length > 0) {
-                sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));
-            }
-            else {
-                sel.push(new(tree.Selector)(elements));
-            }
-        }
-    }
-};
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Selector = function (elements, extendList, condition, index, currentFileInfo, isReferenced) {
-    this.elements = elements;
-    this.extendList = extendList;
-    this.condition = condition;
-    this.currentFileInfo = currentFileInfo || {};
-    this.isReferenced = isReferenced;
-    if (!condition) {
-        this.evaldCondition = true;
-    }
-};
-tree.Selector.prototype = {
-    type: "Selector",
-    accept: function (visitor) {
-        if (this.elements) {
-            this.elements = visitor.visitArray(this.elements);
-        }
-        if (this.extendList) {
-            this.extendList = visitor.visitArray(this.extendList);
-        }
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    createDerived: function(elements, extendList, evaldCondition) {
-        evaldCondition = (evaldCondition != null) ? evaldCondition : this.evaldCondition;
-        var newSelector = new(tree.Selector)(elements, extendList || this.extendList, null, this.index, this.currentFileInfo, this.isReferenced);
-        newSelector.evaldCondition = evaldCondition;
-        newSelector.mediaEmpty = this.mediaEmpty;
-        return newSelector;
-    },
-    match: function (other) {
-        var elements = this.elements,
-            len = elements.length,
-            olen, i;
-
-        other.CacheElements();
-
-        olen = other._elements.length;
-        if (olen === 0 || len < olen) {
-            return 0;
-        } else {
-            for (i = 0; i < olen; i++) {
-                if (elements[i].value !== other._elements[i]) {
-                    return 0;
-                }
-            }
-        }
-
-        return olen; // return number of matched elements
-    },
-    CacheElements: function(){
-        var css = '', len, v, i;
-
-        if( !this._elements ){
-
-            len = this.elements.length;
-            for(i = 0; i < len; i++){
-
-                v = this.elements[i];
-                css += v.combinator.value;
-
-                if( !v.value.value ){
-                    css += v.value;
-                    continue;
-                }
-
-                if( typeof v.value.value !== "string" ){
-                    css = '';
-                    break;
-                }
-                css += v.value.value;
-            }
-
-            this._elements = css.match(/[,&#\.\w-]([\w-]|(\\.))*/g);
-
-            if (this._elements) {
-                if (this._elements[0] === "&") {
-                    this._elements.shift();
-                }
-
-            } else {
-                this._elements = [];
-            }
-
-        }
-    },
-    isJustParentSelector: function() {
-        return !this.mediaEmpty &&
-            this.elements.length === 1 &&
-            this.elements[0].value === '&' &&
-            (this.elements[0].combinator.value === ' ' || this.elements[0].combinator.value === '');
-    },
-    eval: function (env) {
-        var evaldCondition = this.condition && this.condition.eval(env),
-            elements = this.elements, extendList = this.extendList;
-
-        elements = elements && elements.map(function (e) { return e.eval(env); });
-        extendList = extendList && extendList.map(function(extend) { return extend.eval(env); });
-
-        return this.createDerived(elements, extendList, evaldCondition);
-    },
-    genCSS: function (env, output) {
-        var i, element;
-        if ((!env || !env.firstSelector) && this.elements[0].combinator.value === "") {
-            output.add(' ', this.currentFileInfo, this.index);
-        }
-        if (!this._css) {
-            //TODO caching? speed comparison?
-            for(i = 0; i < this.elements.length; i++) {
-                element = this.elements[i];
-                element.genCSS(env, output);
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    markReferenced: function () {
-        this.isReferenced = true;
-    },
-    getIsReferenced: function() {
-        return !this.currentFileInfo.reference || this.isReferenced;
-    },
-    getIsOutput: function() {
-        return this.evaldCondition;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.UnicodeDescriptor = function (value) {
-    this.value = value;
-};
-tree.UnicodeDescriptor.prototype = {
-    type: "UnicodeDescriptor",
-    genCSS: function (env, output) {
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    eval: function () { return this; }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.URL = function (val, currentFileInfo, isEvald) {
-    this.value = val;
-    this.currentFileInfo = currentFileInfo;
-    this.isEvald = isEvald;
-};
-tree.URL.prototype = {
-    type: "Url",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add("url(");
-        this.value.genCSS(env, output);
-        output.add(")");
-    },
-    toCSS: tree.toCSS,
-    eval: function (ctx) {
-        var val = this.value.eval(ctx),
-            rootpath;
-
-        if (!this.isEvald) {
-            // Add the base path if the URL is relative
-            rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-            if (rootpath && typeof val.value === "string" && ctx.isPathRelative(val.value)) {
-                if (!val.quote) {
-                    rootpath = rootpath.replace(/[\(\)'"\s]/g, function(match) { return "\\"+match; });
-                }
-                val.value = rootpath + val.value;
-            }
-
-            val.value = ctx.normalizePath(val.value);
-
-            // Add url args if enabled
-            if (ctx.urlArgs) {
-                if (!val.value.match(/^\s*data:/)) {
-                    var delimiter = val.value.indexOf('?') === -1 ? '?' : '&';
-                    var urlArgs = delimiter + ctx.urlArgs;
-                    if (val.value.indexOf('#') !== -1) {
-                        val.value = val.value.replace('#', urlArgs + '#');
-                    } else {
-                        val.value += urlArgs;
-                    }
-                }
-            }
-        }
-
-        return new(tree.URL)(val, this.currentFileInfo, true);
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Value = function (value) {
-    this.value = value;
-};
-tree.Value.prototype = {
-    type: "Value",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        if (this.value.length === 1) {
-            return this.value[0].eval(env);
-        } else {
-            return new(tree.Value)(this.value.map(function (v) {
-                return v.eval(env);
-            }));
-        }
-    },
-    genCSS: function (env, output) {
-        var i;
-        for(i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i+1 < this.value.length) {
-                output.add((env && env.compress) ? ',' : ', ');
-            }
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Variable = function (name, index, currentFileInfo) {
-    this.name = name;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo || {};
-};
-tree.Variable.prototype = {
-    type: "Variable",
-    eval: function (env) {
-        var variable, name = this.name;
-
-        if (name.indexOf('@@') === 0) {
-            name = '@' + new(tree.Variable)(name.slice(1)).eval(env).value;
-        }
-
-        if (this.evaluating) {
-            throw { type: 'Name',
-                    message: "Recursive variable definition for " + name,
-                    filename: this.currentFileInfo.file,
-                    index: this.index };
-        }
-
-        this.evaluating = true;
-
-        variable = tree.find(env.frames, function (frame) {
-            var v = frame.variable(name);
-            if (v) {
-                return v.value.eval(env);
-            }
-        });
-        if (variable) {
-            this.evaluating = false;
-            return variable;
-        } else {
-            throw { type: 'Name',
-                    message: "variable " + name + " is undefined",
-                    filename: this.currentFileInfo.filename,
-                    index: this.index };
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-    var parseCopyProperties = [
-        'paths',            // option - unmodified - paths to search for imports on
-        'optimization',     // option - optimization level (for the chunker)
-        'files',            // list of files that have been imported, used for import-once
-        'contents',         // map - filename to contents of all the files
-        'contentsIgnoredChars', // map - filename to lines at the begining of each file to ignore
-        'relativeUrls',     // option - whether to adjust URL's to be relative
-        'rootpath',         // option - rootpath to append to URL's
-        'strictImports',    // option -
-        'insecure',         // option - whether to allow imports from insecure ssl hosts
-        'dumpLineNumbers',  // option - whether to dump line numbers
-        'compress',         // option - whether to compress
-        'processImports',   // option - whether to process imports. if false then imports will not be imported
-        'syncImport',       // option - whether to import synchronously
-        'javascriptEnabled',// option - whether JavaScript is enabled. if undefined, defaults to true
-        'mime',             // browser only - mime type for sheet import
-        'useFileCache',     // browser only - whether to use the per file session cache
-        'currentFileInfo'   // information about the current file - for error reporting and importing and making urls relative etc.
-    ];
-
-    //currentFileInfo = {
-    //  'relativeUrls' - option - whether to adjust URL's to be relative
-    //  'filename' - full resolved filename of current file
-    //  'rootpath' - path to append to normal URLs for this node
-    //  'currentDirectory' - path to the current file, absolute
-    //  'rootFilename' - filename of the base file
-    //  'entryPath' - absolute path to the entry file
-    //  'reference' - whether the file should not be output and only output parts that are referenced
-
-    tree.parseEnv = function(options) {
-        copyFromOriginal(options, this, parseCopyProperties);
-
-        if (!this.contents) { this.contents = {}; }
-        if (!this.contentsIgnoredChars) { this.contentsIgnoredChars = {}; }
-        if (!this.files) { this.files = {}; }
-
-        if (!this.currentFileInfo) {
-            var filename = (options && options.filename) || "input";
-            var entryPath = filename.replace(/[^\/\\]*$/, "");
-            if (options) {
-                options.filename = null;
-            }
-            this.currentFileInfo = {
-                filename: filename,
-                relativeUrls: this.relativeUrls,
-                rootpath: (options && options.rootpath) || "",
-                currentDirectory: entryPath,
-                entryPath: entryPath,
-                rootFilename: filename
-            };
-        }
-    };
-
-    var evalCopyProperties = [
-        'silent',         // whether to swallow errors and warnings
-        'verbose',        // whether to log more activity
-        'compress',       // whether to compress
-        'yuicompress',    // whether to compress with the outside tool yui compressor
-        'ieCompat',       // whether to enforce IE compatibility (IE8 data-uri)
-        'strictMath',     // whether math has to be within parenthesis
-        'strictUnits',    // whether units need to evaluate correctly
-        'cleancss',       // whether to compress with clean-css
-        'sourceMap',      // whether to output a source map
-        'importMultiple', // whether we are currently importing multiple copies
-        'urlArgs'         // whether to add args into url tokens
-        ];
-
-    tree.evalEnv = function(options, frames) {
-        copyFromOriginal(options, this, evalCopyProperties);
-
-        this.frames = frames || [];
-    };
-
-    tree.evalEnv.prototype.inParenthesis = function () {
-        if (!this.parensStack) {
-            this.parensStack = [];
-        }
-        this.parensStack.push(true);
-    };
-
-    tree.evalEnv.prototype.outOfParenthesis = function () {
-        this.parensStack.pop();
-    };
-
-    tree.evalEnv.prototype.isMathOn = function () {
-        return this.strictMath ? (this.parensStack && this.parensStack.length) : true;
-    };
-
-    tree.evalEnv.prototype.isPathRelative = function (path) {
-        return !/^(?:[a-z-]+:|\/)/.test(path);
-    };
-
-    tree.evalEnv.prototype.normalizePath = function( path ) {
-        var
-          segments = path.split("/").reverse(),
-          segment;
-
-        path = [];
-        while (segments.length !== 0 ) {
-            segment = segments.pop();
-            switch( segment ) {
-                case ".":
-                    break;
-                case "..":
-                    if ((path.length === 0) || (path[path.length - 1] === "..")) {
-                        path.push( segment );
-                    } else {
-                        path.pop();
-                    }
-                    break;
-                default:
-                    path.push( segment );
-                    break;
-            }
-        }
-
-        return path.join("/");
-    };
-
-    //todo - do the same for the toCSS env
-    //tree.toCSSEnv = function (options) {
-    //};
-
-    var copyFromOriginal = function(original, destination, propertiesToCopy) {
-        if (!original) { return; }
-
-        for(var i = 0; i < propertiesToCopy.length; i++) {
-            if (original.hasOwnProperty(propertiesToCopy[i])) {
-                destination[propertiesToCopy[i]] = original[propertiesToCopy[i]];
-            }
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    var _visitArgs = { visitDeeper: true },
-        _hasIndexed = false;
-
-    function _noop(node) {
-        return node;
-    }
-
-    function indexNodeTypes(parent, ticker) {
-        // add .typeIndex to tree node types for lookup table
-        var key, child;
-        for (key in parent) {
-            if (parent.hasOwnProperty(key)) {
-                child = parent[key];
-                switch (typeof child) {
-                    case "function":
-                        // ignore bound functions directly on tree which do not have a prototype
-                        // or aren't nodes
-                        if (child.prototype && child.prototype.type) {
-                            child.prototype.typeIndex = ticker++;
-                        }
-                        break;
-                    case "object":
-                        ticker = indexNodeTypes(child, ticker);
-                        break;
-                }
-            }
-        }
-        return ticker;
-    }
-
-    tree.visitor = function(implementation) {
-        this._implementation = implementation;
-        this._visitFnCache = [];
-
-        if (!_hasIndexed) {
-            indexNodeTypes(tree, 1);
-            _hasIndexed = true;
-        }
-    };
-
-    tree.visitor.prototype = {
-        visit: function(node) {
-            if (!node) {
-                return node;
-            }
-
-            var nodeTypeIndex = node.typeIndex;
-            if (!nodeTypeIndex) {
-                return node;
-            }
-
-            var visitFnCache = this._visitFnCache,
-                impl = this._implementation,
-                aryIndx = nodeTypeIndex << 1,
-                outAryIndex = aryIndx | 1,
-                func = visitFnCache[aryIndx],
-                funcOut = visitFnCache[outAryIndex],
-                visitArgs = _visitArgs,
-                fnName;
-
-            visitArgs.visitDeeper = true;
-
-            if (!func) {
-                fnName = "visit" + node.type;
-                func = impl[fnName] || _noop;
-                funcOut = impl[fnName + "Out"] || _noop;
-                visitFnCache[aryIndx] = func;
-                visitFnCache[outAryIndex] = funcOut;
-            }
-
-            if (func !== _noop) {
-                var newNode = func.call(impl, node, visitArgs);
-                if (impl.isReplacing) {
-                    node = newNode;
-                }
-            }
-
-            if (visitArgs.visitDeeper && node && node.accept) {
-                node.accept(this);
-            }
-
-            if (funcOut != _noop) {
-                funcOut.call(impl, node);
-            }
-
-            return node;
-        },
-        visitArray: function(nodes, nonReplacing) {
-            if (!nodes) {
-                return nodes;
-            }
-
-            var cnt = nodes.length, i;
-
-            // Non-replacing
-            if (nonReplacing || !this._implementation.isReplacing) {
-                for (i = 0; i < cnt; i++) {
-                    this.visit(nodes[i]);
-                }
-                return nodes;
-            }
-
-            // Replacing
-            var out = [];
-            for (i = 0; i < cnt; i++) {
-                var evald = this.visit(nodes[i]);
-                if (!evald.splice) {
-                    out.push(evald);
-                } else if (evald.length) {
-                    this.flatten(evald, out);
-                }
-            }
-            return out;
-        },
-        flatten: function(arr, out) {
-            if (!out) {
-                out = [];
-            }
-
-            var cnt, i, item,
-                nestedCnt, j, nestedItem;
-
-            for (i = 0, cnt = arr.length; i < cnt; i++) {
-                item = arr[i];
-                if (!item.splice) {
-                    out.push(item);
-                    continue;
-                }
-
-                for (j = 0, nestedCnt = item.length; j < nestedCnt; j++) {
-                    nestedItem = item[j];
-                    if (!nestedItem.splice) {
-                        out.push(nestedItem);
-                    } else if (nestedItem.length) {
-                        this.flatten(nestedItem, out);
-                    }
-                }
-            }
-
-            return out;
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.importVisitor = function(importer, finish, evalEnv) {
-        this._visitor = new tree.visitor(this);
-        this._importer = importer;
-        this._finish = finish;
-        this.env = evalEnv || new tree.evalEnv();
-        this.importCount = 0;
-    };
-
-    tree.importVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            var error;
-            try {
-                // process the contents
-                this._visitor.visit(root);
-            }
-            catch(e) {
-                error = e;
-            }
-
-            this.isFinished = true;
-
-            if (this.importCount === 0) {
-                this._finish(error);
-            }
-        },
-        visitImport: function (importNode, visitArgs) {
-            var importVisitor = this,
-                evaldImportNode,
-                inlineCSS = importNode.options.inline;
-
-            if (!importNode.css || inlineCSS) {
-
-                try {
-                    evaldImportNode = importNode.evalForImport(this.env);
-                } catch(e){
-                    if (!e.filename) { e.index = importNode.index; e.filename = importNode.currentFileInfo.filename; }
-                    // attempt to eval properly and treat as css
-                    importNode.css = true;
-                    // if that fails, this error will be thrown
-                    importNode.error = e;
-                }
-
-                if (evaldImportNode && (!evaldImportNode.css || inlineCSS)) {
-                    importNode = evaldImportNode;
-                    this.importCount++;
-                    var env = new tree.evalEnv(this.env, this.env.frames.slice(0));
-
-                    if (importNode.options.multiple) {
-                        env.importMultiple = true;
-                    }
-
-                    this._importer.push(importNode.getPath(), importNode.currentFileInfo, importNode.options, function (e, root, imported, fullPath) {
-                        if (e && !e.filename) { e.index = importNode.index; e.filename = importNode.currentFileInfo.filename; }
-
-                        if (imported && !env.importMultiple) { importNode.skip = imported; }
-
-                        var subFinish = function(e) {
-                            importVisitor.importCount--;
-
-                            if (importVisitor.importCount === 0 && importVisitor.isFinished) {
-                                importVisitor._finish(e);
-                            }
-                        };
-
-                        if (root) {
-                            importNode.root = root;
-                            importNode.importedFilename = fullPath;
-                            if (!inlineCSS && !importNode.skip) {
-                                new(tree.importVisitor)(importVisitor._importer, subFinish, env)
-                                    .run(root);
-                                return;
-                            }
-                        }
-
-                        subFinish();
-                    });
-                }
-            }
-            visitArgs.visitDeeper = false;
-            return importNode;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-            return ruleNode;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            this.env.frames.unshift(directiveNode);
-            return directiveNode;
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.env.frames.shift();
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            this.env.frames.unshift(mixinDefinitionNode);
-            return mixinDefinitionNode;
-        },
-        visitMixinDefinitionOut: function (mixinDefinitionNode) {
-            this.env.frames.shift();
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            this.env.frames.unshift(rulesetNode);
-            return rulesetNode;
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.env.frames.shift();
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            this.env.frames.unshift(mediaNode.ruleset);
-            return mediaNode;
-        },
-        visitMediaOut: function (mediaNode) {
-            this.env.frames.shift();
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.joinSelectorVisitor = function() {
-        this.contexts = [[]];
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.joinSelectorVisitor.prototype = {
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1],
-                paths = [], selectors;
-
-            this.contexts.push(paths);
-
-            if (! rulesetNode.root) {
-                selectors = rulesetNode.selectors;
-                if (selectors) {
-                    selectors = selectors.filter(function(selector) { return selector.getIsOutput(); });
-                    rulesetNode.selectors = selectors.length ? selectors : (selectors = null);
-                    if (selectors) { rulesetNode.joinSelectors(paths, context, selectors); }
-                }
-                if (!selectors) { rulesetNode.rules = null; }
-                rulesetNode.paths = paths;
-            }
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.contexts.length = this.contexts.length - 1;
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1];
-            mediaNode.rules[0].root = (context.length === 0 || context[0].multiMedia);
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.toCSSVisitor = function(env) {
-        this._visitor = new tree.visitor(this);
-        this._env = env;
-    };
-
-    tree.toCSSVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-
-        visitRule: function (ruleNode, visitArgs) {
-            if (ruleNode.variable) {
-                return [];
-            }
-            return ruleNode;
-        },
-
-        visitMixinDefinition: function (mixinNode, visitArgs) {
-            // mixin definitions do not get eval'd - this means they keep state
-            // so we have to clear that state here so it isn't used if toCSS is called twice
-            mixinNode.frames = [];
-            return [];
-        },
-
-        visitExtend: function (extendNode, visitArgs) {
-            return [];
-        },
-
-        visitComment: function (commentNode, visitArgs) {
-            if (commentNode.isSilent(this._env)) {
-                return [];
-            }
-            return commentNode;
-        },
-
-        visitMedia: function(mediaNode, visitArgs) {
-            mediaNode.accept(this._visitor);
-            visitArgs.visitDeeper = false;
-
-            if (!mediaNode.rules.length) {
-                return [];
-            }
-            return mediaNode;
-        },
-
-        visitDirective: function(directiveNode, visitArgs) {
-            if (directiveNode.currentFileInfo.reference && !directiveNode.isReferenced) {
-                return [];
-            }
-            if (directiveNode.name === "@charset") {
-                // Only output the debug info together with subsequent @charset definitions
-                // a comment (or @media statement) before the actual @charset directive would
-                // be considered illegal css as it has to be on the first line
-                if (this.charset) {
-                    if (directiveNode.debugInfo) {
-                        var comment = new tree.Comment("/* " + directiveNode.toCSS(this._env).replace(/\n/g, "")+" */\n");
-                        comment.debugInfo = directiveNode.debugInfo;
-                        return this._visitor.visit(comment);
-                    }
-                    return [];
-                }
-                this.charset = true;
-            }
-            return directiveNode;
-        },
-
-        checkPropertiesInRoot: function(rules) {
-            var ruleNode;
-            for(var i = 0; i < rules.length; i++) {
-                ruleNode = rules[i];
-                if (ruleNode instanceof tree.Rule && !ruleNode.variable) {
-                    throw { message: "properties must be inside selector blocks, they cannot be in the root.",
-                        index: ruleNode.index, filename: ruleNode.currentFileInfo ? ruleNode.currentFileInfo.filename : null};
-                }
-            }
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var rule, rulesets = [];
-            if (rulesetNode.firstRoot) {
-                this.checkPropertiesInRoot(rulesetNode.rules);
-            }
-            if (! rulesetNode.root) {
-                if (rulesetNode.paths) {
-                    rulesetNode.paths = rulesetNode.paths
-                        .filter(function(p) {
-                            var i;
-                            if (p[0].elements[0].combinator.value === ' ') {
-                                p[0].elements[0].combinator = new(tree.Combinator)('');
-                            }
-                            for(i = 0; i < p.length; i++) {
-                                if (p[i].getIsReferenced() && p[i].getIsOutput()) {
-                                    return true;
-                                }
-                            }
-                            return false;
-                        });
-                }
-
-                // Compile rules and rulesets
-                var nodeRules = rulesetNode.rules, nodeRuleCnt = nodeRules ? nodeRules.length : 0;
-                for (var i = 0; i < nodeRuleCnt; ) {
-                    rule = nodeRules[i];
-                    if (rule && rule.rules) {
-                        // visit because we are moving them out from being a child
-                        rulesets.push(this._visitor.visit(rule));
-                        nodeRules.splice(i, 1);
-                        nodeRuleCnt--;
-                        continue;
-                    }
-                    i++;
-                }
-                // accept the visitor to remove rules and refactor itself
-                // then we can decide now whether we want it or not
-                if (nodeRuleCnt > 0) {
-                    rulesetNode.accept(this._visitor);
-                } else {
-                    rulesetNode.rules = null;
-                }
-                visitArgs.visitDeeper = false;
-
-                nodeRules = rulesetNode.rules;
-                if (nodeRules) {
-                    this._mergeRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-                if (nodeRules) {
-                    this._removeDuplicateRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-
-                // now decide whether we keep the ruleset
-                if (nodeRules && nodeRules.length > 0 && rulesetNode.paths.length > 0) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            } else {
-                rulesetNode.accept(this._visitor);
-                visitArgs.visitDeeper = false;
-                if (rulesetNode.firstRoot || (rulesetNode.rules && rulesetNode.rules.length > 0)) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            }
-            if (rulesets.length === 1) {
-                return rulesets[0];
-            }
-            return rulesets;
-        },
-
-        _removeDuplicateRules: function(rules) {
-            if (!rules) { return; }
-
-            // remove duplicates
-            var ruleCache = {},
-                ruleList, rule, i;
-
-            for(i = rules.length - 1; i >= 0 ; i--) {
-                rule = rules[i];
-                if (rule instanceof tree.Rule) {
-                    if (!ruleCache[rule.name]) {
-                        ruleCache[rule.name] = rule;
-                    } else {
-                        ruleList = ruleCache[rule.name];
-                        if (ruleList instanceof tree.Rule) {
-                            ruleList = ruleCache[rule.name] = [ruleCache[rule.name].toCSS(this._env)];
-                        }
-                        var ruleCSS = rule.toCSS(this._env);
-                        if (ruleList.indexOf(ruleCSS) !== -1) {
-                            rules.splice(i, 1);
-                        } else {
-                            ruleList.push(ruleCSS);
-                        }
-                    }
-                }
-            }
-        },
-
-        _mergeRules: function (rules) {
-            if (!rules) { return; }
-
-            var groups = {},
-                parts,
-                rule,
-                key;
-
-            for (var i = 0; i < rules.length; i++) {
-                rule = rules[i];
-
-                if ((rule instanceof tree.Rule) && rule.merge) {
-                    key = [rule.name,
-                        rule.important ? "!" : ""].join(",");
-
-                    if (!groups[key]) {
-                        groups[key] = [];
-                    } else {
-                        rules.splice(i--, 1);
-                    }
-
-                    groups[key].push(rule);
-                }
-            }
-
-            Object.keys(groups).map(function (k) {
-                parts = groups[k];
-
-                if (parts.length > 1) {
-                    rule = parts[0];
-
-                    rule.value = new (tree.Value)(parts.map(function (p) {
-                        return p.value;
-                    }));
-                }
-            });
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    /*jshint loopfunc:true */
-
-    tree.extendFinderVisitor = function() {
-        this._visitor = new tree.visitor(this);
-        this.contexts = [];
-        this.allExtendsStack = [[]];
-    };
-
-    tree.extendFinderVisitor.prototype = {
-        run: function (root) {
-            root = this._visitor.visit(root);
-            root.allExtends = this.allExtendsStack[0];
-            return root;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-
-            var i, j, extend, allSelectorsExtendList = [], extendList;
-
-            // get &:extend(.a); rules which apply to all selectors in this ruleset
-            var rules = rulesetNode.rules, ruleCnt = rules ? rules.length : 0;
-            for(i = 0; i < ruleCnt; i++) {
-                if (rulesetNode.rules[i] instanceof tree.Extend) {
-                    allSelectorsExtendList.push(rules[i]);
-                    rulesetNode.extendOnEveryPath = true;
-                }
-            }
-
-            // now find every selector and apply the extends that apply to all extends
-            // and the ones which apply to an individual extend
-            var paths = rulesetNode.paths;
-            for(i = 0; i < paths.length; i++) {
-                var selectorPath = paths[i],
-                    selector = selectorPath[selectorPath.length - 1],
-                    selExtendList = selector.extendList;
-
-                extendList = selExtendList ? selExtendList.slice(0).concat(allSelectorsExtendList)
-                                           : allSelectorsExtendList;
-
-                if (extendList) {
-                    extendList = extendList.map(function(allSelectorsExtend) {
-                        return allSelectorsExtend.clone();
-                    });
-                }
-
-                for(j = 0; j < extendList.length; j++) {
-                    this.foundExtends = true;
-                    extend = extendList[j];
-                    extend.findSelfSelectors(selectorPath);
-                    extend.ruleset = rulesetNode;
-                    if (j === 0) { extend.firstExtendOnThisSelectorPath = true; }
-                    this.allExtendsStack[this.allExtendsStack.length-1].push(extend);
-                }
-            }
-
-            this.contexts.push(rulesetNode.selectors);
-        },
-        visitRulesetOut: function (rulesetNode) {
-            if (!rulesetNode.root) {
-                this.contexts.length = this.contexts.length - 1;
-            }
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            mediaNode.allExtends = [];
-            this.allExtendsStack.push(mediaNode.allExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            directiveNode.allExtends = [];
-            this.allExtendsStack.push(directiveNode.allExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-    tree.processExtendsVisitor = function() {
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.processExtendsVisitor.prototype = {
-        run: function(root) {
-            var extendFinder = new tree.extendFinderVisitor();
-            extendFinder.run(root);
-            if (!extendFinder.foundExtends) { return root; }
-            root.allExtends = root.allExtends.concat(this.doExtendChaining(root.allExtends, root.allExtends));
-            this.allExtendsStack = [root.allExtends];
-            return this._visitor.visit(root);
-        },
-        doExtendChaining: function (extendsList, extendsListTarget, iterationCount) {
-            //
-            // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering and pasting
-            // the selector we would do normally, but we are also adding an extend with the same target selector
-            // this means this new extend can then go and alter other extends
-            //
-            // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors
-            // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already processed if
-            // we look at each selector at a time, as is done in visitRuleset
-
-            var extendIndex, targetExtendIndex, matches, extendsToAdd = [], newSelector, extendVisitor = this, selectorPath, extend, targetExtend, newExtend;
-
-            iterationCount = iterationCount || 0;
-
-            //loop through comparing every extend with every target extend.
-            // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place
-            // e.g.  .a:extend(.b) {}  and .b:extend(.c) {} then the first extend extends the second one
-            // and the second is the target.
-            // the seperation into two lists allows us to process a subset of chains with a bigger set, as is the
-            // case when processing media queries
-            for(extendIndex = 0; extendIndex < extendsList.length; extendIndex++){
-                for(targetExtendIndex = 0; targetExtendIndex < extendsListTarget.length; targetExtendIndex++){
-
-                    extend = extendsList[extendIndex];
-                    targetExtend = extendsListTarget[targetExtendIndex];
-
-                    // look for circular references
-                    if( extend.parent_ids.indexOf( targetExtend.object_id ) >= 0 ){ continue; }
-
-                    // find a match in the target extends self selector (the bit before :extend)
-                    selectorPath = [targetExtend.selfSelectors[0]];
-                    matches = extendVisitor.findMatch(extend, selectorPath);
-
-                    if (matches.length) {
-
-                        // we found a match, so for each self selector..
-                        extend.selfSelectors.forEach(function(selfSelector) {
-
-                            // process the extend as usual
-                            newSelector = extendVisitor.extendSelector(matches, selectorPath, selfSelector);
-
-                            // but now we create a new extend from it
-                            newExtend = new(tree.Extend)(targetExtend.selector, targetExtend.option, 0);
-                            newExtend.selfSelectors = newSelector;
-
-                            // add the extend onto the list of extends for that selector
-                            newSelector[newSelector.length-1].extendList = [newExtend];
-
-                            // record that we need to add it.
-                            extendsToAdd.push(newExtend);
-                            newExtend.ruleset = targetExtend.ruleset;
-
-                            //remember its parents for circular references
-                            newExtend.parent_ids = newExtend.parent_ids.concat(targetExtend.parent_ids, extend.parent_ids);
-
-                            // only process the selector once.. if we have :extend(.a,.b) then multiple
-                            // extends will look at the same selector path, so when extending
-                            // we know that any others will be duplicates in terms of what is added to the css
-                            if (targetExtend.firstExtendOnThisSelectorPath) {
-                                newExtend.firstExtendOnThisSelectorPath = true;
-                                targetExtend.ruleset.paths.push(newSelector);
-                            }
-                        });
-                    }
-                }
-            }
-
-            if (extendsToAdd.length) {
-                // try to detect circular references to stop a stack overflow.
-                // may no longer be needed.
-                this.extendChainCount++;
-                if (iterationCount > 100) {
-                    var selectorOne = "{unable to calculate}";
-                    var selectorTwo = "{unable to calculate}";
-                    try
-                    {
-                        selectorOne = extendsToAdd[0].selfSelectors[0].toCSS();
-                        selectorTwo = extendsToAdd[0].selector.toCSS();
-                    }
-                    catch(e) {}
-                    throw {message: "extend circular reference detected. One of the circular extends is currently:"+selectorOne+":extend(" + selectorTwo+")"};
-                }
-
-                // now process the new extends on the existing rules so that we can handle a extending b extending c ectending d extending e...
-                return extendsToAdd.concat(extendVisitor.doExtendChaining(extendsToAdd, extendsListTarget, iterationCount+1));
-            } else {
-                return extendsToAdd;
-            }
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitSelector: function (selectorNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-            var matches, pathIndex, extendIndex, allExtends = this.allExtendsStack[this.allExtendsStack.length-1], selectorsToAdd = [], extendVisitor = this, selectorPath;
-
-            // look at each selector path in the ruleset, find any extend matches and then copy, find and replace
-
-            for(extendIndex = 0; extendIndex < allExtends.length; extendIndex++) {
-                for(pathIndex = 0; pathIndex < rulesetNode.paths.length; pathIndex++) {
-                    selectorPath = rulesetNode.paths[pathIndex];
-
-                    // extending extends happens initially, before the main pass
-                    if (rulesetNode.extendOnEveryPath) { continue; }
-                    var extendList = selectorPath[selectorPath.length-1].extendList;
-                    if (extendList && extendList.length) { continue; }
-
-                    matches = this.findMatch(allExtends[extendIndex], selectorPath);
-
-                    if (matches.length) {
-
-                        allExtends[extendIndex].selfSelectors.forEach(function(selfSelector) {
-                            selectorsToAdd.push(extendVisitor.extendSelector(matches, selectorPath, selfSelector));
-                        });
-                    }
-                }
-            }
-            rulesetNode.paths = rulesetNode.paths.concat(selectorsToAdd);
-        },
-        findMatch: function (extend, haystackSelectorPath) {
-            //
-            // look through the haystack selector path to try and find the needle - extend.selector
-            // returns an array of selector matches that can then be replaced
-            //
-            var haystackSelectorIndex, hackstackSelector, hackstackElementIndex, haystackElement,
-                targetCombinator, i,
-                extendVisitor = this,
-                needleElements = extend.selector.elements,
-                potentialMatches = [], potentialMatch, matches = [];
-
-            // loop through the haystack elements
-            for(haystackSelectorIndex = 0; haystackSelectorIndex < haystackSelectorPath.length; haystackSelectorIndex++) {
-                hackstackSelector = haystackSelectorPath[haystackSelectorIndex];
-
-                for(hackstackElementIndex = 0; hackstackElementIndex < hackstackSelector.elements.length; hackstackElementIndex++) {
-
-                    haystackElement = hackstackSelector.elements[hackstackElementIndex];
-
-                    // if we allow elements before our match we can add a potential match every time. otherwise only at the first element.
-                    if (extend.allowBefore || (haystackSelectorIndex === 0 && hackstackElementIndex === 0)) {
-                        potentialMatches.push({pathIndex: haystackSelectorIndex, index: hackstackElementIndex, matched: 0, initialCombinator: haystackElement.combinator});
-                    }
-
-                    for(i = 0; i < potentialMatches.length; i++) {
-                        potentialMatch = potentialMatches[i];
-
-                        // selectors add " " onto the first element. When we use & it joins the selectors together, but if we don't
-                        // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to work out
-                        // what the resulting combinator will be
-                        targetCombinator = haystackElement.combinator.value;
-                        if (targetCombinator === '' && hackstackElementIndex === 0) {
-                            targetCombinator = ' ';
-                        }
-
-                        // if we don't match, null our match to indicate failure
-                        if (!extendVisitor.isElementValuesEqual(needleElements[potentialMatch.matched].value, haystackElement.value) ||
-                            (potentialMatch.matched > 0 && needleElements[potentialMatch.matched].combinator.value !== targetCombinator)) {
-                            potentialMatch = null;
-                        } else {
-                            potentialMatch.matched++;
-                        }
-
-                        // if we are still valid and have finished, test whether we have elements after and whether these are allowed
-                        if (potentialMatch) {
-                            potentialMatch.finished = potentialMatch.matched === needleElements.length;
-                            if (potentialMatch.finished &&
-                                (!extend.allowAfter && (hackstackElementIndex+1 < hackstackSelector.elements.length || haystackSelectorIndex+1 < haystackSelectorPath.length))) {
-                                potentialMatch = null;
-                            }
-                        }
-                        // if null we remove, if not, we are still valid, so either push as a valid match or continue
-                        if (potentialMatch) {
-                            if (potentialMatch.finished) {
-                                potentialMatch.length = needleElements.length;
-                                potentialMatch.endPathIndex = haystackSelectorIndex;
-                                potentialMatch.endPathElementIndex = hackstackElementIndex + 1; // index after end of match
-                                potentialMatches.length = 0; // we don't allow matches to overlap, so start matching again
-                                matches.push(potentialMatch);
-                            }
-                        } else {
-                            potentialMatches.splice(i, 1);
-                            i--;
-                        }
-                    }
-                }
-            }
-            return matches;
-        },
-        isElementValuesEqual: function(elementValue1, elementValue2) {
-            if (typeof elementValue1 === "string" || typeof elementValue2 === "string") {
-                return elementValue1 === elementValue2;
-            }
-            if (elementValue1 instanceof tree.Attribute) {
-                if (elementValue1.op !== elementValue2.op || elementValue1.key !== elementValue2.key) {
-                    return false;
-                }
-                if (!elementValue1.value || !elementValue2.value) {
-                    if (elementValue1.value || elementValue2.value) {
-                        return false;
-                    }
-                    return true;
-                }
-                elementValue1 = elementValue1.value.value || elementValue1.value;
-                elementValue2 = elementValue2.value.value || elementValue2.value;
-                return elementValue1 === elementValue2;
-            }
-            elementValue1 = elementValue1.value;
-            elementValue2 = elementValue2.value;
-            if (elementValue1 instanceof tree.Selector) {
-                if (!(elementValue2 instanceof tree.Selector) || elementValue1.elements.length !== elementValue2.elements.length) {
-                    return false;
-                }
-                for(var i = 0; i <elementValue1.elements.length; i++) {
-                    if (elementValue1.elements[i].combinator.value !== elementValue2.elements[i].combinator.value) {
-                        if (i !== 0 || (elementValue1.elements[i].combinator.value || ' ') !== (elementValue2.elements[i].combinator.value || ' ')) {
-                            return false;
-                        }
-                    }
-                    if (!this.isElementValuesEqual(elementValue1.elements[i].value, elementValue2.elements[i].value)) {
-                        return false;
-                    }
-                }
-                return true;
-            }
-            return false;
-        },
-        extendSelector:function (matches, selectorPath, replacementSelector) {
-
-            //for a set of matches, replace each match with the replacement selector
-
-            var currentSelectorPathIndex = 0,
-                currentSelectorPathElementIndex = 0,
-                path = [],
-                matchIndex,
-                selector,
-                firstElement,
-                match,
-                newElements;
-
-            for (matchIndex = 0; matchIndex < matches.length; matchIndex++) {
-                match = matches[matchIndex];
-                selector = selectorPath[match.pathIndex];
-                firstElement = new tree.Element(
-                    match.initialCombinator,
-                    replacementSelector.elements[0].value,
-                    replacementSelector.elements[0].index,
-                    replacementSelector.elements[0].currentFileInfo
-                );
-
-                if (match.pathIndex > currentSelectorPathIndex && currentSelectorPathElementIndex > 0) {
-                    path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-
-                newElements = selector.elements
-                    .slice(currentSelectorPathElementIndex, match.index)
-                    .concat([firstElement])
-                    .concat(replacementSelector.elements.slice(1));
-
-                if (currentSelectorPathIndex === match.pathIndex && matchIndex > 0) {
-                    path[path.length - 1].elements =
-                        path[path.length - 1].elements.concat(newElements);
-                } else {
-                    path = path.concat(selectorPath.slice(currentSelectorPathIndex, match.pathIndex));
-
-                    path.push(new tree.Selector(
-                        newElements
-                    ));
-                }
-                currentSelectorPathIndex = match.endPathIndex;
-                currentSelectorPathElementIndex = match.endPathElementIndex;
-                if (currentSelectorPathElementIndex >= selectorPath[currentSelectorPathIndex].elements.length) {
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-            }
-
-            if (currentSelectorPathIndex < selectorPath.length && currentSelectorPathElementIndex > 0) {
-                path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                currentSelectorPathIndex++;
-            }
-
-            path = path.concat(selectorPath.slice(currentSelectorPathIndex, selectorPath.length));
-
-            return path;
-        },
-        visitRulesetOut: function (rulesetNode) {
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var newAllExtends = mediaNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, mediaNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            var newAllExtends = directiveNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, directiveNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    tree.sourceMapOutput = function (options) {
-        this._css = [];
-        this._rootNode = options.rootNode;
-        this._writeSourceMap = options.writeSourceMap;
-        this._contentsMap = options.contentsMap;
-        this._contentsIgnoredCharsMap = options.contentsIgnoredCharsMap;
-        this._sourceMapFilename = options.sourceMapFilename;
-        this._outputFilename = options.outputFilename;
-        this._sourceMapURL = options.sourceMapURL;
-        if (options.sourceMapBasepath) {
-            this._sourceMapBasepath = options.sourceMapBasepath.replace(/\\/g, '/');
-        }
-        this._sourceMapRootpath = options.sourceMapRootpath;
-        this._outputSourceFiles = options.outputSourceFiles;
-        this._sourceMapGeneratorConstructor = options.sourceMapGenerator || require("source-map").SourceMapGenerator;
-
-        if (this._sourceMapRootpath && this._sourceMapRootpath.charAt(this._sourceMapRootpath.length-1) !== '/') {
-            this._sourceMapRootpath += '/';
-        }
-
-        this._lineNumber = 0;
-        this._column = 0;
-    };
-
-    tree.sourceMapOutput.prototype.normalizeFilename = function(filename) {
-        filename = filename.replace(/\\/g, '/');
-
-        if (this._sourceMapBasepath && filename.indexOf(this._sourceMapBasepath) === 0) {
-            filename = filename.substring(this._sourceMapBasepath.length);
-            if (filename.charAt(0) === '\\' || filename.charAt(0) === '/') {
-               filename = filename.substring(1);
-            }
-        }
-        return (this._sourceMapRootpath || "") + filename;
-    };
-
-    tree.sourceMapOutput.prototype.add = function(chunk, fileInfo, index, mapLines) {
-
-        //ignore adding empty strings
-        if (!chunk) {
-            return;
-        }
-
-        var lines,
-            sourceLines,
-            columns,
-            sourceColumns,
-            i;
-
-        if (fileInfo) {
-            var inputSource = this._contentsMap[fileInfo.filename];
-
-            // remove vars/banner added to the top of the file
-            if (this._contentsIgnoredCharsMap[fileInfo.filename]) {
-                // adjust the index
-                index -= this._contentsIgnoredCharsMap[fileInfo.filename];
-                if (index < 0) { index = 0; }
-                // adjust the source
-                inputSource = inputSource.slice(this._contentsIgnoredCharsMap[fileInfo.filename]);
-            }
-            inputSource = inputSource.substring(0, index);
-            sourceLines = inputSource.split("\n");
-            sourceColumns = sourceLines[sourceLines.length-1];
-        }
-
-        lines = chunk.split("\n");
-        columns = lines[lines.length-1];
-
-        if (fileInfo) {
-            if (!mapLines) {
-                this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + 1, column: this._column},
-                    original: { line: sourceLines.length, column: sourceColumns.length},
-                    source: this.normalizeFilename(fileInfo.filename)});
-            } else {
-                for(i = 0; i < lines.length; i++) {
-                    this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + i + 1, column: i === 0 ? this._column : 0},
-                        original: { line: sourceLines.length + i, column: i === 0 ? sourceColumns.length : 0},
-                        source: this.normalizeFilename(fileInfo.filename)});
-                }
-            }
-        }
-
-        if (lines.length === 1) {
-            this._column += columns.length;
-        } else {
-            this._lineNumber += lines.length - 1;
-            this._column = columns.length;
-        }
-
-        this._css.push(chunk);
-    };
-
-    tree.sourceMapOutput.prototype.isEmpty = function() {
-        return this._css.length === 0;
-    };
-
-    tree.sourceMapOutput.prototype.toCSS = function(env) {
-        this._sourceMapGenerator = new this._sourceMapGeneratorConstructor({ file: this._outputFilename, sourceRoot: null });
-
-        if (this._outputSourceFiles) {
-            for(var filename in this._contentsMap) {
-                if (this._contentsMap.hasOwnProperty(filename))
-                {
-                    var source = this._contentsMap[filename];
-                    if (this._contentsIgnoredCharsMap[filename]) {
-                        source = source.slice(this._contentsIgnoredCharsMap[filename]);
-                    }
-                    this._sourceMapGenerator.setSourceContent(this.normalizeFilename(filename), source);
-                }
-            }
-        }
-
-        this._rootNode.genCSS(env, this);
-
-        if (this._css.length > 0) {
-            var sourceMapURL,
-                sourceMapContent = JSON.stringify(this._sourceMapGenerator.toJSON());
-
-            if (this._sourceMapURL) {
-                sourceMapURL = this._sourceMapURL;
-            } else if (this._sourceMapFilename) {
-                sourceMapURL = this.normalizeFilename(this._sourceMapFilename);
-            }
-
-            if (this._writeSourceMap) {
-                this._writeSourceMap(sourceMapContent);
-            } else {
-                sourceMapURL = "data:application/json," + encodeURIComponent(sourceMapContent);
-            }
-
-            if (sourceMapURL) {
-                this._css.push("/*# sourceMappingURL=" + sourceMapURL + " */");
-            }
-        }
-
-        return this._css.join('');
-    };
-
-})(require('./tree'));
-
-//
-// browser.js - client-side engine
-//
-/*global less, window, document, XMLHttpRequest, location */
-
-var isFileProtocol = /^(file|chrome(-extension)?|resource|qrc|app):/.test(location.protocol);
-
-less.env = less.env || (location.hostname == '127.0.0.1' ||
-                        location.hostname == '0.0.0.0'   ||
-                        location.hostname == 'localhost' ||
-                        (location.port &&
-                          location.port.length > 0)      ||
-                        isFileProtocol                   ? 'development'
-                                                         : 'production');
-
-var logLevel = {
-    info: 2,
-    errors: 1,
-    none: 0
-};
-
-// The amount of logging in the javascript console.
-// 2 - Information and errors
-// 1 - Errors
-// 0 - None
-// Defaults to 2
-less.logLevel = typeof(less.logLevel) != 'undefined' ? less.logLevel : logLevel.info;
-
-// Load styles asynchronously (default: false)
-//
-// This is set to `false` by default, so that the body
-// doesn't start loading before the stylesheets are parsed.
-// Setting this to `true` can result in flickering.
-//
-less.async = less.async || false;
-less.fileAsync = less.fileAsync || false;
-
-// Interval between watch polls
-less.poll = less.poll || (isFileProtocol ? 1000 : 1500);
-
-//Setup user functions
-if (less.functions) {
-    for(var func in less.functions) {
-        if (less.functions.hasOwnProperty(func)) {
-            less.tree.functions[func] = less.functions[func];
-        }
-   }
-}
-
-var dumpLineNumbers = /!dumpLineNumbers:(comments|mediaquery|all)/.exec(location.hash);
-if (dumpLineNumbers) {
-    less.dumpLineNumbers = dumpLineNumbers[1];
-}
-
-var typePattern = /^text\/(x-)?less$/;
-var cache = null;
-var fileCache = {};
-
-function log(str, level) {
-	console.log(str);
-}
-
-function extractId(href) {
-    return href.replace(/^[a-z-]+:\/+?[^\/]+/, '' )  // Remove protocol & domain
-        .replace(/^\//,                 '' )  // Remove root /
-        .replace(/\.[a-zA-Z]+$/,        '' )  // Remove simple extension
-        .replace(/[^\.\w-]+/g,          '-')  // Replace illegal characters
-        .replace(/\./g,                 ':'); // Replace dots with colons(for valid id)
-}
-
-function errorConsole(e, rootHref) {
-    var template = '{line} {content}';
-    var filename = e.filename || rootHref;
-    var errors = [];
-    var content = (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        " in " + filename + " ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':\n' +
-            errors.join('\n');
-    } else if (e.stack) {
-        content += e.stack;
-    }
-    log(content, logLevel.errors);
-}
-
-function createCSS(styles, sheet, lastModified) {
-    // Strip the query-string
-    var href = sheet.href || '';
-
-    // If there is no title set, use the filename, minus the extension
-    var id = 'less:' + (sheet.title || extractId(href));
-
-    // If this has already been inserted into the DOM, we may need to replace it
-    var oldCss = document.getElementById(id);
-    var keepOldCss = false;
-
-    // Create a new stylesheet node for insertion or (if necessary) replacement
-    var css = document.createElement('style');
-    css.setAttribute('type', 'text/css');
-    if (sheet.media) {
-        css.setAttribute('media', sheet.media);
-    }
-    css.id = id;
-
-    if (css.styleSheet) { // IE
-        try {
-            css.styleSheet.cssText = styles;
-        } catch (e) {
-            throw new(Error)("Couldn't reassign styleSheet.cssText.");
-        }
-    } else {
-        css.appendChild(document.createTextNode(styles));
-
-        // If new contents match contents of oldCss, don't replace oldCss
-        keepOldCss = (oldCss !== null && oldCss.childNodes.length > 0 && css.childNodes.length > 0 &&
-            oldCss.firstChild.nodeValue === css.firstChild.nodeValue);
-    }
-
-    var head = document.getElementsByTagName('head')[0];
-
-    // If there is no oldCss, just append; otherwise, only append if we need
-    // to replace oldCss with an updated stylesheet
-    if (oldCss === null || keepOldCss === false) {
-        var nextEl = sheet && sheet.nextSibling || null;
-        if (nextEl) {
-            nextEl.parentNode.insertBefore(css, nextEl);
-        } else {
-            head.appendChild(css);
-        }
-    }
-    if (oldCss && keepOldCss === false) {
-        oldCss.parentNode.removeChild(oldCss);
-    }
-
-    // Don't update the local store if the file wasn't modified
-    if (lastModified && cache) {
-        //log('saving ' + href + ' to cache.', logLevel.info);
-        try {
-            cache.setItem(href, styles);
-            cache.setItem(href + ':timestamp', lastModified);
-        } catch(e) {
-            //TODO - could do with adding more robust error handling
-            //log('failed to save', logLevel.errors);
-        }
-    }
-}
-
-function errorHTML(e, rootHref) {
-    var id = 'less-error-message:' + extractId(rootHref || "");
-    var template = '<li><label>{line}</label><pre class="{class}">{content}</pre></li>';
-    var elem = document.createElement('div'), timer, content, errors = [];
-    var filename = e.filename || rootHref;
-    var filenameNoPath = filename.match(/([^\/]+(\?.*)?)$/)[1];
-
-    elem.id        = id;
-    elem.className = "less-error-message";
-
-    content = '<h3>'  + (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        '</h3>' + '<p>in <a href="' + filename   + '">' + filenameNoPath + "</a> ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':</p>' +
-            '<ul>' + errors.join('') + '</ul>';
-    } else if (e.stack) {
-        content += '<br/>' + e.stack.split('\n').slice(1).join('<br/>');
-    }
-    elem.innerHTML = content;
-
-    // CSS for error messages
-    createCSS([
-        '.less-error-message ul, .less-error-message li {',
-        'list-style-type: none;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message label {',
-        'font-size: 12px;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'color: #cc7777;',
-        '}',
-        '.less-error-message pre {',
-        'color: #dd6666;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        'display: inline-block;',
-        '}',
-        '.less-error-message pre.line {',
-        'color: #ff0000;',
-        '}',
-        '.less-error-message h3 {',
-        'font-size: 20px;',
-        'font-weight: bold;',
-        'padding: 15px 0 5px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message a {',
-        'color: #10a',
-        '}',
-        '.less-error-message .error {',
-        'color: red;',
-        'font-weight: bold;',
-        'padding-bottom: 2px;',
-        'border-bottom: 1px dashed red;',
-        '}'
-    ].join('\n'), { title: 'error-message' });
-
-    elem.style.cssText = [
-        "font-family: Arial, sans-serif",
-        "border: 1px solid #e00",
-        "background-color: #eee",
-        "border-radius: 5px",
-        "-webkit-border-radius: 5px",
-        "-moz-border-radius: 5px",
-        "color: #e00",
-        "padding: 15px",
-        "margin-bottom: 15px"
-    ].join(';');
-
-    if (less.env == 'development') {
-        timer = setInterval(function () {
-            if (document.body) {
-                if (document.getElementById(id)) {
-                    document.body.replaceChild(elem, document.getElementById(id));
-                } else {
-                    document.body.insertBefore(elem, document.body.firstChild);
-                }
-                clearInterval(timer);
-            }
-        }, 10);
-    }
-}
-
-function error(e, rootHref) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        errorHTML(e, rootHref);
-    } else if (less.errorReporting === "console") {
-        errorConsole(e, rootHref);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("add", e, rootHref);
-    }
-}
-
-function removeErrorHTML(path) {
-    var node = document.getElementById('less-error-message:' + extractId(path));
-    if (node) {
-        node.parentNode.removeChild(node);
-    }
-}
-
-function removeErrorConsole(path) {
-    //no action
-}
-
-function removeError(path) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        removeErrorHTML(path);
-    } else if (less.errorReporting === "console") {
-        removeErrorConsole(path);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("remove", path);
-    }
-}
-
-function loadStyles(modifyVars) {
-    var styles = document.getElementsByTagName('style'),
-        style;
-    for (var i = 0; i < styles.length; i++) {
-        style = styles[i];
-        if (style.type.match(typePattern)) {
-            var env = new less.tree.parseEnv(less),
-                lessText = style.innerHTML || '';
-            env.filename = document.location.href.replace(/#.*$/, '');
-
-            if (modifyVars || less.globalVars) {
-                env.useFileCache = true;
-            }
-
-            /*jshint loopfunc:true */
-            // use closure to store current value of i
-            var callback = (function(style) {
-                return function (e, cssAST) {
-                    if (e) {
-                        return error(e, "inline");
-                    }
-                    var css = cssAST.toCSS(less);
-                    style.type = 'text/css';
-                    if (style.styleSheet) {
-                        style.styleSheet.cssText = css;
-                    } else {
-                        style.innerHTML = css;
-                    }
-                };
-            })(style);
-            new(less.Parser)(env).parse(lessText, callback, {globalVars: less.globalVars, modifyVars: modifyVars});
-        }
-    }
-}
-
-function extractUrlParts(url, baseUrl) {
-    // urlParts[1] = protocol&hostname || /
-    // urlParts[2] = / if path relative to host base
-    // urlParts[3] = directories
-    // urlParts[4] = filename
-    // urlParts[5] = parameters
-
-    var urlPartsRegex = /^((?:[a-z-]+:)?\/+?(?:[^\/\?#]*\/)|([\/\\]))?((?:[^\/\\\?#]*[\/\\])*)([^\/\\\?#]*)([#\?].*)?$/i,
-        urlParts = url.match(urlPartsRegex),
-        returner = {}, directories = [], i, baseUrlParts;
-
-    if (!urlParts) {
-        throw new Error("Could not parse sheet href - '"+url+"'");
-    }
-
-    // Stylesheets in IE don't always return the full path
-    if (!urlParts[1] || urlParts[2]) {
-        baseUrlParts = baseUrl.match(urlPartsRegex);
-        if (!baseUrlParts) {
-            throw new Error("Could not parse page url - '"+baseUrl+"'");
-        }
-        urlParts[1] = urlParts[1] || baseUrlParts[1] || "";
-        if (!urlParts[2]) {
-            urlParts[3] = baseUrlParts[3] + urlParts[3];
-        }
-    }
-
-    if (urlParts[3]) {
-        directories = urlParts[3].replace(/\\/g, "/").split("/");
-
-        // extract out . before .. so .. doesn't absorb a non-directory
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".") {
-                directories.splice(i, 1);
-                i -= 1;
-            }
-        }
-
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".." && i > 0) {
-                directories.splice(i-1, 2);
-                i -= 2;
-            }
-        }
-    }
-
-    returner.hostPart = urlParts[1];
-    returner.directories = directories;
-    returner.path = urlParts[1] + directories.join("/");
-    returner.fileUrl = returner.path + (urlParts[4] || "");
-    returner.url = returner.fileUrl + (urlParts[5] || "");
-    return returner;
-}
-
-function pathDiff(url, baseUrl) {
-    // diff between two paths to create a relative path
-
-    var urlParts = extractUrlParts(url),
-        baseUrlParts = extractUrlParts(baseUrl),
-        i, max, urlDirectories, baseUrlDirectories, diff = "";
-    if (urlParts.hostPart !== baseUrlParts.hostPart) {
-        return "";
-    }
-    max = Math.max(baseUrlParts.directories.length, urlParts.directories.length);
-    for(i = 0; i < max; i++) {
-        if (baseUrlParts.directories[i] !== urlParts.directories[i]) { break; }
-    }
-    baseUrlDirectories = baseUrlParts.directories.slice(i);
-    urlDirectories = urlParts.directories.slice(i);
-    for(i = 0; i < baseUrlDirectories.length-1; i++) {
-        diff += "../";
-    }
-    for(i = 0; i < urlDirectories.length-1; i++) {
-        diff += urlDirectories[i] + "/";
-    }
-    return diff;
-}
-
-function getXMLHttpRequest() {
-    if (window.XMLHttpRequest) {
-        return new XMLHttpRequest();
-    } else {
-        try {
-            /*global ActiveXObject */
-            return new ActiveXObject("MSXML2.XMLHTTP.3.0");
-        } catch (e) {
-            //log("browser doesn't support AJAX.", logLevel.errors);
-            return null;
-        }
-    }
-}
-
-function doXHR(url, type, callback, errback) {
-    var xhr = getXMLHttpRequest();
-    var async = isFileProtocol ? less.fileAsync : less.async;
-
-    if (typeof(xhr.overrideMimeType) === 'function') {
-        xhr.overrideMimeType('text/css');
-    }
-    //log("XHR: Getting '" + url + "'", logLevel.info);
-    xhr.open('GET', url, async);
-    xhr.setRequestHeader('Accept', type || 'text/x-less, text/css; q=0.9, */*; q=0.5');
-    xhr.send(null);
-
-    function handleResponse(xhr, callback, errback) {
-        if (xhr.status >= 200 && xhr.status < 300) {
-            callback(xhr.responseText,
-                xhr.getResponseHeader("Last-Modified"));
-        } else if (typeof(errback) === 'function') {
-            errback(xhr.status, url);
-        }
-    }
-
-    if (isFileProtocol && !less.fileAsync) {
-        if (xhr.status === 0 || (xhr.status >= 200 && xhr.status < 300)) {
-            callback(xhr.responseText);
-        } else {
-            errback(xhr.status, url);
-        }
-    } else if (async) {
-        xhr.onreadystatechange = function () {
-            if (xhr.readyState == 4) {
-                handleResponse(xhr, callback, errback);
-            }
-        };
-    } else {
-        handleResponse(xhr, callback, errback);
-    }
-}
-
-function loadFile(originalHref, currentFileInfo, callback, env, modifyVars) {
-
-    if (currentFileInfo && currentFileInfo.currentDirectory && !/^([a-z-]+:)?\//.test(originalHref)) {
-        originalHref = currentFileInfo.currentDirectory + originalHref;
-    }
-
-    // sheet may be set to the stylesheet for the initial load or a collection of properties including
-    // some env variables for imports
-    var hrefParts = extractUrlParts(originalHref, window.location.href);
-    var href      = hrefParts.url;
-    var newFileInfo = {
-        currentDirectory: hrefParts.path,
-        filename: href
-    };
-
-    if (currentFileInfo) {
-        newFileInfo.entryPath = currentFileInfo.entryPath;
-        newFileInfo.rootpath = currentFileInfo.rootpath;
-        newFileInfo.rootFilename = currentFileInfo.rootFilename;
-        newFileInfo.relativeUrls = currentFileInfo.relativeUrls;
-    } else {
-        newFileInfo.entryPath = hrefParts.path;
-        newFileInfo.rootpath = less.rootpath || hrefParts.path;
-        newFileInfo.rootFilename = href;
-        newFileInfo.relativeUrls = env.relativeUrls;
-    }
-
-    if (newFileInfo.relativeUrls) {
-        if (env.rootpath) {
-            newFileInfo.rootpath = extractUrlParts(env.rootpath + pathDiff(hrefParts.path, newFileInfo.entryPath)).path;
-        } else {
-            newFileInfo.rootpath = hrefParts.path;
-        }
-    }
-
-    if (env.useFileCache && fileCache[href]) {
-        try {
-            var lessText = fileCache[href];
-            callback(null, lessText, href, newFileInfo, { lastModified: new Date() });
-        } catch (e) {
-            callback(e, null, href);
-        }
-        return;
-    }
-
-    doXHR(href, env.mime, function (data, lastModified) {
-        // per file cache
-        fileCache[href] = data;
-
-        // Use remote copy (re-parse)
-        try {
-            callback(null, data, href, newFileInfo, { lastModified: lastModified });
-        } catch (e) {
-            callback(e, null, href);
-        }
-    }, function (status, url) {
-        callback({ type: 'File', message: "'" + url + "' wasn't found (" + status + ")" }, null, href);
-    });
-}
-
-function loadStyleSheet(sheet, callback, reload, remaining, modifyVars) {
-
-    var env = new less.tree.parseEnv(less);
-    env.mime = sheet.type;
-
-    if (modifyVars || less.globalVars) {
-        env.useFileCache = true;
-    }
-
-    loadFile(sheet.href, null, function(e, data, path, newFileInfo, webInfo) {
-
-        if (webInfo) {
-            webInfo.remaining = remaining;
-
-            var css       = cache && cache.getItem(path),
-                timestamp = cache && cache.getItem(path + ':timestamp');
-
-            if (!reload && timestamp && webInfo.lastModified &&
-                (new(Date)(webInfo.lastModified).valueOf() ===
-                    new(Date)(timestamp).valueOf())) {
-                // Use local copy
-                createCSS(css, sheet);
-                webInfo.local = true;
-                callback(null, null, data, sheet, webInfo, path);
-                return;
-            }
-        }
-
-        //TODO add tests around how this behaves when reloading
-        removeError(path);
-
-        if (data) {
-            env.currentFileInfo = newFileInfo;
-            new(less.Parser)(env).parse(data, function (e, root) {
-                if (e) { return callback(e, null, null, sheet); }
-                try {
-                    callback(e, root, data, sheet, webInfo, path);
-                } catch (e) {
-                    callback(e, null, null, sheet);
-                }
-            }, {modifyVars: modifyVars, globalVars: less.globalVars});
-        } else {
-            callback(e, null, null, sheet, webInfo, path);
-        }
-    }, env, modifyVars);
-}
-
-function loadStyleSheets(callback, reload, modifyVars) {
-    for (var i = 0; i < less.sheets.length; i++) {
-        loadStyleSheet(less.sheets[i], callback, reload, less.sheets.length - (i + 1), modifyVars);
-    }
-}
-
-function initRunningMode(){
-    if (less.env === 'development') {
-        less.optimization = 0;
-        less.watchTimer = setInterval(function () {
-            if (less.watchMode) {
-                loadStyleSheets(function (e, root, _, sheet, env) {
-                    if (e) {
-                        error(e, sheet.href);
-                    } else if (root) {
-                        createCSS(root.toCSS(less), sheet, env.lastModified);
-                    }
-                });
-            }
-        }, less.poll);
-    } else {
-        less.optimization = 3;
-    }
-}
-
-
-
-//
-// Watch mode
-//
-less.watch   = function () {
-    if (!less.watchMode ){
-        less.env = 'development';
-         initRunningMode();
-    }
-    this.watchMode = true;
-    return true;
-};
-
-less.unwatch = function () {clearInterval(less.watchTimer); this.watchMode = false; return false; };
-
-if (/!watch/.test(location.hash)) {
-    less.watch();
-}
-
-if (less.env != 'development') {
-    try {
-        cache = (typeof(window.localStorage) === 'undefined') ? null : window.localStorage;
-    } catch (_) {}
-}
-
-//
-// Get all <link> tags with the 'rel' attribute set to "stylesheet/less"
-//
-var links = document.getElementsByTagName('link');
-
-less.sheets = [];
-
-for (var i = 0; i < links.length; i++) {
-    if (links[i].rel === 'stylesheet/less' || (links[i].rel.match(/stylesheet/) &&
-       (links[i].type.match(typePattern)))) {
-        less.sheets.push(links[i]);
-    }
-}
-
-//
-// With this function, it's possible to alter variables and re-render
-// CSS without reloading less-files
-//
-less.modifyVars = function(record) {
-    less.refresh(false, record);
-};
-
-less.refresh = function (reload, modifyVars) {
-    var startTime, endTime;
-    startTime = endTime = new Date();
-
-    loadStyleSheets(function (e, root, _, sheet, env) {
-        if (e) {
-            return error(e, sheet.href);
-        }
-        if (env.local) {
-            //log("loading " + sheet.href + " from cache.", logLevel.info);
-        } else {
-            //log("parsed " + sheet.href + " successfully.", logLevel.info);
-            //createCSS(root.toCSS(less), sheet, env.lastModified);
-
-
-            // less.php changes
-            var css = root.toCSS(less);
-            function totextarea(){
-                var textarea = document.getElementById('lessjs_textarea');
-                if( textarea ){
-                    textarea.value = css;
-                    diffUsingJS(0);
-                }else{
-                    window.setTimeout(totextarea,300);
-                }
-            }
-            totextarea();
-
-        }
-        log("css for " + sheet.href + " generated in " + (new Date() - endTime) + 'ms', logLevel.info);
-        if (env.remaining === 0) {
-            //log("css generated in " + (new Date() - startTime) + 'ms', logLevel.info);
-        }
-        endTime = new Date();
-    }, reload, modifyVars);
-
-    loadStyles(modifyVars);
-};
-
-less.refreshStyles = loadStyles;
-
-less.Parser.fileLoader = loadFile;
-
-less.refresh(less.env === 'development');
-
-// amd.js
-//
-// Define Less as an AMD module.
-if (typeof define === "function" && define.amd) {
-    define(function () { return less; } );
-}
-
-})(window);
\ No newline at end of file
diff --git a/test/assets/less-1.7.0.js b/test/assets/less-1.7.0.js
deleted file mode 100644
index a9c76111..00000000
--- a/test/assets/less-1.7.0.js
+++ /dev/null
@@ -1,7936 +0,0 @@
-/*!
- * LESS - Leaner CSS v1.7.0
- * http://lesscss.org
- *
- * Copyright (c) 2009-2014, Alexis Sellier <self@cloudhead.net>
- * Licensed under the Apache v2 License.
- *
- */
-
- /** * @license Apache v2
- */
-
-
-
-(function (window, undefined) {//
-// Stub out `require` in the browser
-//
-function require(arg) {
-    return window.less[arg.split('/')[1]];
-};
-
-
-if (typeof(window.less) === 'undefined' || typeof(window.less.nodeType) !== 'undefined') { window.less = {}; }
-less = window.less;
-tree = window.less.tree = {};
-less.mode = 'browser';
-
-var less, tree;
-
-// Node.js does not have a header file added which defines less
-if (less === undefined) {
-    less = exports;
-    tree = require('./tree');
-    less.mode = 'node';
-}
-//
-// less.js - parser
-//
-//    A relatively straight-forward predictive parser.
-//    There is no tokenization/lexing stage, the input is parsed
-//    in one sweep.
-//
-//    To make the parser fast enough to run in the browser, several
-//    optimization had to be made:
-//
-//    - Matching and slicing on a huge input is often cause of slowdowns.
-//      The solution is to chunkify the input into smaller strings.
-//      The chunks are stored in the `chunks` var,
-//      `j` holds the current chunk index, and `currentPos` holds
-//      the index of the current chunk in relation to `input`.
-//      This gives us an almost 4x speed-up.
-//
-//    - In many cases, we don't need to match individual tokens;
-//      for example, if a value doesn't hold any variables, operations
-//      or dynamic references, the parser can effectively 'skip' it,
-//      treating it as a literal.
-//      An example would be '1px solid #000' - which evaluates to itself,
-//      we don't need to know what the individual components are.
-//      The drawback, of course is that you don't get the benefits of
-//      syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
-//      and a smaller speed-up in the code-gen.
-//
-//
-//    Token matching is done with the `$` function, which either takes
-//    a terminal string or regexp, or a non-terminal function to call.
-//    It also takes care of moving all the indices forwards.
-//
-//
-less.Parser = function Parser(env) {
-    var input,       // LeSS input string
-        i,           // current index in `input`
-        j,           // current chunk
-        saveStack = [],   // holds state for backtracking
-        furthest,    // furthest index the parser has gone to
-        chunks,      // chunkified input
-        current,     // current chunk
-        currentPos,  // index of current chunk, in `input`
-        parser,
-        parsers,
-        rootFilename = env && env.filename;
-
-    // Top parser on an import tree must be sure there is one "env"
-    // which will then be passed around by reference.
-    if (!(env instanceof tree.parseEnv)) {
-        env = new tree.parseEnv(env);
-    }
-
-    var imports = this.imports = {
-        paths: env.paths || [],  // Search paths, when importing
-        queue: [],               // Files which haven't been imported yet
-        files: env.files,        // Holds the imported parse trees
-        contents: env.contents,  // Holds the imported file contents
-        contentsIgnoredChars: env.contentsIgnoredChars, // lines inserted, not in the original less
-        mime:  env.mime,         // MIME type of .less files
-        error: null,             // Error in parsing/evaluating an import
-        push: function (path, currentFileInfo, importOptions, callback) {
-            var parserImports = this;
-            this.queue.push(path);
-
-            var fileParsedFunc = function (e, root, fullPath) {
-                parserImports.queue.splice(parserImports.queue.indexOf(path), 1); // Remove the path from the queue
-
-                var importedPreviously = fullPath === rootFilename;
-
-                parserImports.files[fullPath] = root;                        // Store the root
-
-                if (e && !parserImports.error) { parserImports.error = e; }
-
-                callback(e, root, importedPreviously, fullPath);
-            };
-
-            if (less.Parser.importer) {
-                less.Parser.importer(path, currentFileInfo, fileParsedFunc, env);
-            } else {
-                less.Parser.fileLoader(path, currentFileInfo, function(e, contents, fullPath, newFileInfo) {
-                    if (e) {fileParsedFunc(e); return;}
-
-                    var newEnv = new tree.parseEnv(env);
-
-                    newEnv.currentFileInfo = newFileInfo;
-                    newEnv.processImports = false;
-                    newEnv.contents[fullPath] = contents;
-
-                    if (currentFileInfo.reference || importOptions.reference) {
-                        newFileInfo.reference = true;
-                    }
-
-                    if (importOptions.inline) {
-                        fileParsedFunc(null, contents, fullPath);
-                    } else {
-                        new(less.Parser)(newEnv).parse(contents, function (e, root) {
-                            fileParsedFunc(e, root, fullPath);
-                        });
-                    }
-                }, env);
-            }
-        }
-    };
-
-    function save()    { currentPos = i; saveStack.push( { current: current, i: i, j: j }); }
-    function restore() { var state = saveStack.pop(); current = state.current; currentPos = i = state.i; j = state.j; }
-    function forget() { saveStack.pop(); }
-
-    function sync() {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-    }
-    function isWhitespace(str, pos) {
-        var code = str.charCodeAt(pos | 0);
-        return (code <= 32) && (code === 32 || code === 10 || code === 9);
-    }
-    //
-    // Parse from a token, regexp or string, and move forward if match
-    //
-    function $(tok) {
-        var tokType = typeof tok,
-            match, length;
-
-        // Either match a single character in the input,
-        // or match a regexp in the current chunk (`current`).
-        //
-        if (tokType === "string") {
-            if (input.charAt(i) !== tok) {
-                return null;
-            }
-            skipWhitespace(1);
-            return tok;
-        }
-
-        // regexp
-        sync ();
-        if (! (match = tok.exec(current))) {
-            return null;
-        }
-
-        length = match[0].length;
-
-        // The match is confirmed, add the match length to `i`,
-        // and consume any extra white-space characters (' ' || '\n')
-        // which come after that. The reason for this is that LeSS's
-        // grammar is mostly white-space insensitive.
-        //
-        skipWhitespace(length);
-
-        if(typeof(match) === 'string') {
-            return match;
-        } else {
-            return match.length === 1 ? match[0] : match;
-        }
-    }
-
-    // Specialization of $(tok)
-    function $re(tok) {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-        var m = tok.exec(current);
-        if (!m) {
-            return null;
-        }
-
-        skipWhitespace(m[0].length);
-        if(typeof m === "string") {
-            return m;
-        }
-
-        return m.length === 1 ? m[0] : m;
-    }
-
-    var _$re = $re;
-
-    // Specialization of $(tok)
-    function $char(tok) {
-        if (input.charAt(i) !== tok) {
-            return null;
-        }
-        skipWhitespace(1);
-        return tok;
-    }
-
-    function skipWhitespace(length) {
-        var oldi = i, oldj = j,
-            curr = i - currentPos,
-            endIndex = i + current.length - curr,
-            mem = (i += length),
-            inp = input,
-            c;
-
-        for (; i < endIndex; i++) {
-            c = inp.charCodeAt(i);
-            if (c > 32) {
-                break;
-            }
-
-            if ((c !== 32) && (c !== 10) && (c !== 9) && (c !== 13)) {
-                break;
-            }
-         }
-
-        current = current.slice(length + i - mem + curr);
-        currentPos = i;
-
-        if (!current.length && (j < chunks.length - 1)) {
-            current = chunks[++j];
-            skipWhitespace(0); // skip space at the beginning of a chunk
-            return true; // things changed
-        }
-
-        return oldi !== i || oldj !== j;
-    }
-
-    function expect(arg, msg) {
-        // some older browsers return typeof 'function' for RegExp
-        var result = (Object.prototype.toString.call(arg) === '[object Function]') ? arg.call(parsers) : $(arg);
-        if (result) {
-            return result;
-        }
-        error(msg || (typeof(arg) === 'string' ? "expected '" + arg + "' got '" + input.charAt(i) + "'"
-                                               : "unexpected token"));
-    }
-
-    // Specialization of expect()
-    function expectChar(arg, msg) {
-        if (input.charAt(i) === arg) {
-            skipWhitespace(1);
-            return arg;
-        }
-        error(msg || "expected '" + arg + "' got '" + input.charAt(i) + "'");
-    }
-
-    function error(msg, type) {
-        var e = new Error(msg);
-        e.index = i;
-        e.type = type || 'Syntax';
-        throw e;
-    }
-
-    // Same as $(), but don't change the state of the parser,
-    // just return the match.
-    function peek(tok) {
-        if (typeof(tok) === 'string') {
-            return input.charAt(i) === tok;
-        } else {
-            return tok.test(current);
-        }
-    }
-
-    // Specialization of peek()
-    function peekChar(tok) {
-        return input.charAt(i) === tok;
-    }
-
-
-    function getInput(e, env) {
-        if (e.filename && env.currentFileInfo.filename && (e.filename !== env.currentFileInfo.filename)) {
-            return parser.imports.contents[e.filename];
-        } else {
-            return input;
-        }
-    }
-
-    function getLocation(index, inputStream) {
-        var n = index + 1,
-            line = null,
-            column = -1;
-
-        while (--n >= 0 && inputStream.charAt(n) !== '\n') {
-            column++;
-        }
-
-        if (typeof index === 'number') {
-            line = (inputStream.slice(0, index).match(/\n/g) || "").length;
-        }
-
-        return {
-            line: line,
-            column: column
-        };
-    }
-
-    function getDebugInfo(index, inputStream, env) {
-        var filename = env.currentFileInfo.filename;
-        if(less.mode !== 'browser' && less.mode !== 'rhino') {
-            filename = require('path').resolve(filename);
-        }
-
-        return {
-            lineNumber: getLocation(index, inputStream).line + 1,
-            fileName: filename
-        };
-    }
-
-    function LessError(e, env) {
-        var input = getInput(e, env),
-            loc = getLocation(e.index, input),
-            line = loc.line,
-            col  = loc.column,
-            callLine = e.call && getLocation(e.call, input).line,
-            lines = input.split('\n');
-
-        this.type = e.type || 'Syntax';
-        this.message = e.message;
-        this.filename = e.filename || env.currentFileInfo.filename;
-        this.index = e.index;
-        this.line = typeof(line) === 'number' ? line + 1 : null;
-        this.callLine = callLine + 1;
-        this.callExtract = lines[callLine];
-        this.stack = e.stack;
-        this.column = col;
-        this.extract = [
-            lines[line - 1],
-            lines[line],
-            lines[line + 1]
-        ];
-    }
-
-    LessError.prototype = new Error();
-    LessError.prototype.constructor = LessError;
-
-    this.env = env = env || {};
-
-    // The optimization level dictates the thoroughness of the parser,
-    // the lower the number, the less nodes it will create in the tree.
-    // This could matter for debugging, or if you want to access
-    // the individual nodes in the tree.
-    this.optimization = ('optimization' in this.env) ? this.env.optimization : 1;
-
-    //
-    // The Parser
-    //
-    parser = {
-
-        imports: imports,
-        //
-        // Parse an input string into an abstract syntax tree,
-        // @param str A string containing 'less' markup
-        // @param callback call `callback` when done.
-        // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply
-        //
-        parse: function (str, callback, additionalData) {
-            var root, line, lines, error = null, globalVars, modifyVars, preText = "";
-
-            i = j = currentPos = furthest = 0;
-
-            globalVars = (additionalData && additionalData.globalVars) ? less.Parser.serializeVars(additionalData.globalVars) + '\n' : '';
-            modifyVars = (additionalData && additionalData.modifyVars) ? '\n' + less.Parser.serializeVars(additionalData.modifyVars) : '';
-
-            if (globalVars || (additionalData && additionalData.banner)) {
-                preText = ((additionalData && additionalData.banner) ? additionalData.banner : "") + globalVars;
-                parser.imports.contentsIgnoredChars[env.currentFileInfo.filename] = preText.length;
-            }
-
-            str = str.replace(/\r\n/g, '\n');
-            // Remove potential UTF Byte Order Mark
-            input = str = preText + str.replace(/^\uFEFF/, '') + modifyVars;
-            parser.imports.contents[env.currentFileInfo.filename] = str;
-
-            // Split the input into chunks.
-            chunks = (function (input) {
-                var len = input.length, level = 0, parenLevel = 0,
-                    lastOpening, lastOpeningParen, lastMultiComment, lastMultiCommentEndBrace,
-                    chunks = [], emitFrom = 0,
-                    parserCurrentIndex, currentChunkStartIndex, cc, cc2, matched;
-
-                function fail(msg, index) {
-                    error = new(LessError)({
-                        index: index || parserCurrentIndex,
-                        type: 'Parse',
-                        message: msg,
-                        filename: env.currentFileInfo.filename
-                    }, env);
-                }
-
-                function emitChunk(force) {
-                    var len = parserCurrentIndex - emitFrom;
-                    if (((len < 512) && !force) || !len) {
-                        return;
-                    }
-                    chunks.push(input.slice(emitFrom, parserCurrentIndex + 1));
-                    emitFrom = parserCurrentIndex + 1;
-                }
-
-                for (parserCurrentIndex = 0; parserCurrentIndex < len; parserCurrentIndex++) {
-                    cc = input.charCodeAt(parserCurrentIndex);
-                    if (((cc >= 97) && (cc <= 122)) || (cc < 34)) {
-                        // a-z or whitespace
-                        continue;
-                    }
-
-                    switch (cc) {
-                        case 40:                        // (
-                            parenLevel++;
-                            lastOpeningParen = parserCurrentIndex;
-                            continue;
-                        case 41:                        // )
-                            if (--parenLevel < 0) {
-                                return fail("missing opening `(`");
-                            }
-                            continue;
-                        case 59:                        // ;
-                            if (!parenLevel) { emitChunk(); }
-                            continue;
-                        case 123:                       // {
-                            level++;
-                            lastOpening = parserCurrentIndex;
-                            continue;
-                        case 125:                       // }
-                            if (--level < 0) {
-                                return fail("missing opening `{`");
-                            }
-                            if (!level && !parenLevel) { emitChunk(); }
-                            continue;
-                        case 92:                        // \
-                            if (parserCurrentIndex < len - 1) { parserCurrentIndex++; continue; }
-                            return fail("unescaped `\\`");
-                        case 34:
-                        case 39:
-                        case 96:                        // ", ' and `
-                            matched = 0;
-                            currentChunkStartIndex = parserCurrentIndex;
-                            for (parserCurrentIndex = parserCurrentIndex + 1; parserCurrentIndex < len; parserCurrentIndex++) {
-                                cc2 = input.charCodeAt(parserCurrentIndex);
-                                if (cc2 > 96) { continue; }
-                                if (cc2 == cc) { matched = 1; break; }
-                                if (cc2 == 92) {        // \
-                                    if (parserCurrentIndex == len - 1) {
-                                        return fail("unescaped `\\`");
-                                    }
-                                    parserCurrentIndex++;
-                                }
-                            }
-                            if (matched) { continue; }
-                            return fail("unmatched `" + String.fromCharCode(cc) + "`", currentChunkStartIndex);
-                        case 47:                        // /, check for comment
-                            if (parenLevel || (parserCurrentIndex == len - 1)) { continue; }
-                            cc2 = input.charCodeAt(parserCurrentIndex + 1);
-                            if (cc2 == 47) {
-                                // //, find lnfeed
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if ((cc2 <= 13) && ((cc2 == 10) || (cc2 == 13))) { break; }
-                                }
-                            } else if (cc2 == 42) {
-                                // /*, find */
-                                lastMultiComment = currentChunkStartIndex = parserCurrentIndex;
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len - 1; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if (cc2 == 125) { lastMultiCommentEndBrace = parserCurrentIndex; }
-                                    if (cc2 != 42) { continue; }
-                                    if (input.charCodeAt(parserCurrentIndex + 1) == 47) { break; }
-                                }
-                                if (parserCurrentIndex == len - 1) {
-                                    return fail("missing closing `*/`", currentChunkStartIndex);
-                                }
-                                parserCurrentIndex++;
-                            }
-                            continue;
-                        case 42:                       // *, check for unmatched */
-                            if ((parserCurrentIndex < len - 1) && (input.charCodeAt(parserCurrentIndex + 1) == 47)) {
-                                return fail("unmatched `/*`");
-                            }
-                            continue;
-                    }
-                }
-
-                if (level !== 0) {
-                    if ((lastMultiComment > lastOpening) && (lastMultiCommentEndBrace > lastMultiComment)) {
-                        return fail("missing closing `}` or `*/`", lastOpening);
-                    } else {
-                        return fail("missing closing `}`", lastOpening);
-                    }
-                } else if (parenLevel !== 0) {
-                    return fail("missing closing `)`", lastOpeningParen);
-                }
-
-                emitChunk(true);
-                return chunks;
-            })(str);
-
-            if (error) {
-                return callback(new(LessError)(error, env));
-            }
-
-            current = chunks[0];
-
-            // Start with the primary rule.
-            // The whole syntax tree is held under a Ruleset node,
-            // with the `root` property set to true, so no `{}` are
-            // output. The callback is called when the input is parsed.
-            try {
-                root = new(tree.Ruleset)(null, this.parsers.primary());
-                root.root = true;
-                root.firstRoot = true;
-            } catch (e) {
-                return callback(new(LessError)(e, env));
-            }
-
-            root.toCSS = (function (evaluate) {
-                return function (options, variables) {
-                    options = options || {};
-                    var evaldRoot,
-                        css,
-                        evalEnv = new tree.evalEnv(options);
-
-                    //
-                    // Allows setting variables with a hash, so:
-                    //
-                    //   `{ color: new(tree.Color)('#f01') }` will become:
-                    //
-                    //   new(tree.Rule)('@color',
-                    //     new(tree.Value)([
-                    //       new(tree.Expression)([
-                    //         new(tree.Color)('#f01')
-                    //       ])
-                    //     ])
-                    //   )
-                    //
-                    if (typeof(variables) === 'object' && !Array.isArray(variables)) {
-                        variables = Object.keys(variables).map(function (k) {
-                            var value = variables[k];
-
-                            if (! (value instanceof tree.Value)) {
-                                if (! (value instanceof tree.Expression)) {
-                                    value = new(tree.Expression)([value]);
-                                }
-                                value = new(tree.Value)([value]);
-                            }
-                            return new(tree.Rule)('@' + k, value, false, null, 0);
-                        });
-                        evalEnv.frames = [new(tree.Ruleset)(null, variables)];
-                    }
-
-                    try {
-                        var preEvalVisitors = [],
-                            visitors = [
-                                new(tree.joinSelectorVisitor)(),
-                                new(tree.processExtendsVisitor)(),
-                                new(tree.toCSSVisitor)({compress: Boolean(options.compress)})
-                            ], i, root = this;
-
-                        if (options.plugins) {
-                            for(i =0; i < options.plugins.length; i++) {
-                                if (options.plugins[i].isPreEvalVisitor) {
-                                    preEvalVisitors.push(options.plugins[i]);
-                                } else {
-                                    if (options.plugins[i].isPreVisitor) {
-                                        visitors.splice(0, 0, options.plugins[i]);
-                                    } else {
-                                        visitors.push(options.plugins[i]);
-                                    }
-                                }
-                            }
-                        }
-
-                        for(i = 0; i < preEvalVisitors.length; i++) {
-                            preEvalVisitors[i].run(root);
-                        }
-
-                        evaldRoot = evaluate.call(root, evalEnv);
-
-                        for(i = 0; i < visitors.length; i++) {
-                            visitors[i].run(evaldRoot);
-                        }
-
-                        if (options.sourceMap) {
-                            evaldRoot = new tree.sourceMapOutput(
-                                {
-                                    contentsIgnoredCharsMap: parser.imports.contentsIgnoredChars,
-                                    writeSourceMap: options.writeSourceMap,
-                                    rootNode: evaldRoot,
-                                    contentsMap: parser.imports.contents,
-                                    sourceMapFilename: options.sourceMapFilename,
-                                    sourceMapURL: options.sourceMapURL,
-                                    outputFilename: options.sourceMapOutputFilename,
-                                    sourceMapBasepath: options.sourceMapBasepath,
-                                    sourceMapRootpath: options.sourceMapRootpath,
-                                    outputSourceFiles: options.outputSourceFiles,
-                                    sourceMapGenerator: options.sourceMapGenerator
-                                });
-                        }
-
-                        css = evaldRoot.toCSS({
-                                compress: Boolean(options.compress),
-                                dumpLineNumbers: env.dumpLineNumbers,
-                                strictUnits: Boolean(options.strictUnits),
-                                numPrecision: 8});
-                    } catch (e) {
-                        throw new(LessError)(e, env);
-                    }
-
-                    if (options.cleancss && less.mode === 'node') {
-                        var CleanCSS = require('clean-css'),
-                            cleancssOptions = options.cleancssOptions || {};
-
-                        if (cleancssOptions.keepSpecialComments === undefined) {
-                            cleancssOptions.keepSpecialComments = "*";
-                        }
-                        cleancssOptions.processImport = false;
-                        cleancssOptions.noRebase = true;
-                        if (cleancssOptions.noAdvanced === undefined) {
-                            cleancssOptions.noAdvanced = true;
-                        }
-
-                        return new CleanCSS(cleancssOptions).minify(css);
-                    } else if (options.compress) {
-                        return css.replace(/(^(\s)+)|((\s)+$)/g, "");
-                    } else {
-                        return css;
-                    }
-                };
-            })(root.eval);
-
-            // If `i` is smaller than the `input.length - 1`,
-            // it means the parser wasn't able to parse the whole
-            // string, so we've got a parsing error.
-            //
-            // We try to extract a \n delimited string,
-            // showing the line where the parse error occured.
-            // We split it up into two parts (the part which parsed,
-            // and the part which didn't), so we can color them differently.
-            if (i < input.length - 1) {
-                i = furthest;
-                var loc = getLocation(i, input);
-                lines = input.split('\n');
-                line = loc.line + 1;
-
-                error = {
-                    type: "Parse",
-                    message: "Unrecognised input",
-                    index: i,
-                    filename: env.currentFileInfo.filename,
-                    line: line,
-                    column: loc.column,
-                    extract: [
-                        lines[line - 2],
-                        lines[line - 1],
-                        lines[line]
-                    ]
-                };
-            }
-
-            var finish = function (e) {
-                e = error || e || parser.imports.error;
-
-                if (e) {
-                    if (!(e instanceof LessError)) {
-                        e = new(LessError)(e, env);
-                    }
-
-                    return callback(e);
-                }
-                else {
-                    return callback(null, root);
-                }
-            };
-
-            if (env.processImports !== false) {
-                new tree.importVisitor(this.imports, finish)
-                    .run(root);
-            } else {
-                return finish();
-            }
-        },
-
-        //
-        // Here in, the parsing rules/functions
-        //
-        // The basic structure of the syntax tree generated is as follows:
-        //
-        //   Ruleset ->  Rule -> Value -> Expression -> Entity
-        //
-        // Here's some LESS code:
-        //
-        //    .class {
-        //      color: #fff;
-        //      border: 1px solid #000;
-        //      width: @w + 4px;
-        //      > .child {...}
-        //    }
-        //
-        // And here's what the parse tree might look like:
-        //
-        //     Ruleset (Selector '.class', [
-        //         Rule ("color",  Value ([Expression [Color #fff]]))
-        //         Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
-        //         Rule ("width",  Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
-        //         Ruleset (Selector [Element '>', '.child'], [...])
-        //     ])
-        //
-        //  In general, most rules will try to parse a token with the `$()` function, and if the return
-        //  value is truly, will return a new node, of the relevant type. Sometimes, we need to check
-        //  first, before parsing, that's when we use `peek()`.
-        //
-        parsers: parsers = {
-            //
-            // The `primary` rule is the *entry* and *exit* point of the parser.
-            // The rules here can appear at any level of the parse tree.
-            //
-            // The recursive nature of the grammar is an interplay between the `block`
-            // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
-            // as represented by this simplified grammar:
-            //
-            //     primary  →  (ruleset | rule)+
-            //     ruleset  →  selector+ block
-            //     block    →  '{' primary '}'
-            //
-            // Only at one point is the primary rule not called from the
-            // block rule: at the root level.
-            //
-            primary: function () {
-                var mixin = this.mixin, $re = _$re, root = [], node;
-
-                while (current)
-                {
-                    node = this.extendRule() || mixin.definition() || this.rule() || this.ruleset() ||
-                        mixin.call() || this.comment() || this.rulesetCall() || this.directive();
-                    if (node) {
-                        root.push(node);
-                    } else {
-                        if (!($re(/^[\s\n]+/) || $re(/^;+/))) {
-                            break;
-                        }
-                    }
-                    if (peekChar('}')) {
-                        break;
-                    }
-                }
-
-                return root;
-            },
-
-            // We create a Comment node for CSS comments `/* */`,
-            // but keep the LeSS comments `//` silent, by just skipping
-            // over them.
-            comment: function () {
-                var comment;
-
-                if (input.charAt(i) !== '/') { return; }
-
-                if (input.charAt(i + 1) === '/') {
-                    return new(tree.Comment)($re(/^\/\/.*/), true, i, env.currentFileInfo);
-                }
-                comment = $re(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/);
-                if (comment) {
-                    return new(tree.Comment)(comment, false, i, env.currentFileInfo);
-                }
-            },
-
-            comments: function () {
-                var comment, comments = [];
-
-                while(true) {
-                    comment = this.comment();
-                    if (!comment) {
-                        break;
-                    }
-                    comments.push(comment);
-                }
-
-                return comments;
-            },
-
-            //
-            // Entities are tokens which can be found inside an Expression
-            //
-            entities: {
-                //
-                // A string, which supports escaping " and '
-                //
-                //     "milky way" 'he\'s the one!'
-                //
-                quoted: function () {
-                    var str, j = i, e, index = i;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '"' && input.charAt(j) !== "'") { return; }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/);
-                    if (str) {
-                        return new(tree.Quoted)(str[0], str[1] || str[2], e, index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A catch-all word, such as:
-                //
-                //     black border-collapse
-                //
-                keyword: function () {
-                    var k;
-
-                    k = $re(/^%|^[_A-Za-z-][_A-Za-z0-9-]*/);
-                    if (k) {
-                        var color = tree.Color.fromKeyword(k);
-                        if (color) {
-                            return color;
-                        }
-                        return new(tree.Keyword)(k);
-                    }
-                },
-
-                //
-                // A function call
-                //
-                //     rgb(255, 0, 255)
-                //
-                // We also try to catch IE's `alpha()`, but let the `alpha` parser
-                // deal with the details.
-                //
-                // The arguments are parsed with the `entities.arguments` parser.
-                //
-                call: function () {
-                    var name, nameLC, args, alpha_ret, index = i;
-
-                    name = /^([\w-]+|%|progid:[\w\.]+)\(/.exec(current);
-                    if (!name) { return; }
-
-                    name = name[1];
-                    nameLC = name.toLowerCase();
-                    if (nameLC === 'url') {
-                        return null;
-                    }
-
-                    i += name.length;
-
-                    if (nameLC === 'alpha') {
-                        alpha_ret = parsers.alpha();
-                        if(typeof alpha_ret !== 'undefined') {
-                            return alpha_ret;
-                        }
-                    }
-
-                    $char('('); // Parse the '(' and consume whitespace.
-
-                    args = this.arguments();
-
-                    if (! $char(')')) {
-                        return;
-                    }
-
-                    if (name) { return new(tree.Call)(name, args, index, env.currentFileInfo); }
-                },
-                arguments: function () {
-                    var args = [], arg;
-
-                    while (true) {
-                        arg = this.assignment() || parsers.expression();
-                        if (!arg) {
-                            break;
-                        }
-                        args.push(arg);
-                        if (! $char(',')) {
-                            break;
-                        }
-                    }
-                    return args;
-                },
-                literal: function () {
-                    return this.dimension() ||
-                           this.color() ||
-                           this.quoted() ||
-                           this.unicodeDescriptor();
-                },
-
-                // Assignments are argument entities for calls.
-                // They are present in ie filter properties as shown below.
-                //
-                //     filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
-                //
-
-                assignment: function () {
-                    var key, value;
-                    key = $re(/^\w+(?=\s?=)/i);
-                    if (!key) {
-                        return;
-                    }
-                    if (!$char('=')) {
-                        return;
-                    }
-                    value = parsers.entity();
-                    if (value) {
-                        return new(tree.Assignment)(key, value);
-                    }
-                },
-
-                //
-                // Parse url() tokens
-                //
-                // We use a specific rule for urls, because they don't really behave like
-                // standard function calls. The difference is that the argument doesn't have
-                // to be enclosed within a string, so it can't be parsed as an Expression.
-                //
-                url: function () {
-                    var value;
-
-                    if (input.charAt(i) !== 'u' || !$re(/^url\(/)) {
-                        return;
-                    }
-
-                    value = this.quoted() || this.variable() ||
-                            $re(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) || "";
-
-                    expectChar(')');
-
-                    return new(tree.URL)((value.value != null || value instanceof tree.Variable)
-                                        ? value : new(tree.Anonymous)(value), env.currentFileInfo);
-                },
-
-                //
-                // A Variable entity, such as `@fink`, in
-                //
-                //     width: @fink + 2px
-                //
-                // We use a different parser for variable definitions,
-                // see `parsers.variable`.
-                //
-                variable: function () {
-                    var name, index = i;
-
-                    if (input.charAt(i) === '@' && (name = $re(/^@@?[\w-]+/))) {
-                        return new(tree.Variable)(name, index, env.currentFileInfo);
-                    }
-                },
-
-                // A variable entity useing the protective {} e.g. @{var}
-                variableCurly: function () {
-                    var curly, index = i;
-
-                    if (input.charAt(i) === '@' && (curly = $re(/^@\{([\w-]+)\}/))) {
-                        return new(tree.Variable)("@" + curly[1], index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A Hexadecimal color
-                //
-                //     #4F3C2F
-                //
-                // `rgb` and `hsl` colors are parsed through the `entities.call` parser.
-                //
-                color: function () {
-                    var rgb;
-
-                    if (input.charAt(i) === '#' && (rgb = $re(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/))) {
-                        return new(tree.Color)(rgb[1]);
-                    }
-                },
-
-                //
-                // A Dimension, that is, a number and a unit
-                //
-                //     0.5em 95%
-                //
-                dimension: function () {
-                    var value, c = input.charCodeAt(i);
-                    //Is the first char of the dimension 0-9, '.', '+' or '-'
-                    if ((c > 57 || c < 43) || c === 47 || c == 44) {
-                        return;
-                    }
-
-                    value = $re(/^([+-]?\d*\.?\d+)(%|[a-z]+)?/);
-                    if (value) {
-                        return new(tree.Dimension)(value[1], value[2]);
-                    }
-                },
-
-                //
-                // A unicode descriptor, as is used in unicode-range
-                //
-                // U+0??  or U+00A1-00A9
-                //
-                unicodeDescriptor: function () {
-                    var ud;
-
-                    ud = $re(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/);
-                    if (ud) {
-                        return new(tree.UnicodeDescriptor)(ud[0]);
-                    }
-                },
-
-                //
-                // JavaScript code to be evaluated
-                //
-                //     `window.location.href`
-                //
-                javascript: function () {
-                    var str, j = i, e;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '`') { return; }
-                    if (env.javascriptEnabled !== undefined && !env.javascriptEnabled) {
-                        error("You are using JavaScript, which has been disabled.");
-                    }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^`([^`]*)`/);
-                    if (str) {
-                        return new(tree.JavaScript)(str[1], i, e);
-                    }
-                }
-            },
-
-            //
-            // The variable part of a variable definition. Used in the `rule` parser
-            //
-            //     @fink:
-            //
-            variable: function () {
-                var name;
-
-                if (input.charAt(i) === '@' && (name = $re(/^(@[\w-]+)\s*:/))) { return name[1]; }
-            },
-
-            //
-            // The variable part of a variable definition. Used in the `rule` parser
-            //
-            //     @fink();
-            //
-            rulesetCall: function () {
-                var name;
-
-                if (input.charAt(i) === '@' && (name = $re(/^(@[\w-]+)\s*\(\s*\)\s*;/))) {
-                    return new tree.RulesetCall(name[1]);
-                }
-            },
-
-            //
-            // extend syntax - used to extend selectors
-            //
-            extend: function(isRule) {
-                var elements, e, index = i, option, extendList, extend;
-
-                if (!(isRule ? $re(/^&:extend\(/) : $re(/^:extend\(/))) { return; }
-
-                do {
-                    option = null;
-                    elements = null;
-                    while (! (option = $re(/^(all)(?=\s*(\)|,))/))) {
-                        e = this.element();
-                        if (!e) { break; }
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                    }
-
-                    option = option && option[1];
-
-                    extend = new(tree.Extend)(new(tree.Selector)(elements), option, index);
-                    if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-
-                } while($char(","));
-
-                expect(/^\)/);
-
-                if (isRule) {
-                    expect(/^;/);
-                }
-
-                return extendList;
-            },
-
-            //
-            // extendRule - used in a rule to extend all the parent selectors
-            //
-            extendRule: function() {
-                return this.extend(true);
-            },
-
-            //
-            // Mixins
-            //
-            mixin: {
-                //
-                // A Mixin call, with an optional argument list
-                //
-                //     #mixins > .square(#fff);
-                //     .rounded(4px, black);
-                //     .button;
-                //
-                // The `while` loop is there because mixins can be
-                // namespaced, but we only support the child and descendant
-                // selector for now.
-                //
-                call: function () {
-                    var s = input.charAt(i), important = false, index = i, elemIndex,
-                        elements, elem, e, c, args;
-
-                    if (s !== '.' && s !== '#') { return; }
-
-                    save(); // stop us absorbing part of an invalid selector
-
-                    while (true) {
-                        elemIndex = i;
-                        e = $re(/^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/);
-                        if (!e) {
-                            break;
-                        }
-                        elem = new(tree.Element)(c, e, elemIndex, env.currentFileInfo);
-                        if (elements) { elements.push(elem); } else { elements = [ elem ]; }
-                        c = $char('>');
-                    }
-
-                    if (elements) {
-                        if ($char('(')) {
-                            args = this.args(true).args;
-                            expectChar(')');
-                        }
-
-                        if (parsers.important()) {
-                            important = true;
-                        }
-
-                        if (parsers.end()) {
-                            forget();
-                            return new(tree.mixin.Call)(elements, args, index, env.currentFileInfo, important);
-                        }
-                    }
-
-                    restore();
-                },
-                args: function (isCall) {
-                    var parsers = parser.parsers, entities = parsers.entities,
-                        returner = { args:null, variadic: false },
-                        expressions = [], argsSemiColon = [], argsComma = [],
-                        isSemiColonSeperated, expressionContainsNamed, name, nameLoop, value, arg;
-
-                    save();
-
-                    while (true) {
-                        if (isCall) {
-                            arg = parsers.detachedRuleset() || parsers.expression();
-                        } else {
-                            parsers.comments();
-                            if (input.charAt(i) === '.' && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ variadic: true });
-                                break;
-                            }
-                            arg = entities.variable() || entities.literal() || entities.keyword();
-                        }
-
-                        if (!arg) {
-                            break;
-                        }
-
-                        nameLoop = null;
-                        if (arg.throwAwayComments) {
-                            arg.throwAwayComments();
-                        }
-                        value = arg;
-                        var val = null;
-
-                        if (isCall) {
-                            // Variable
-                            if (arg.value && arg.value.length == 1) {
-                                val = arg.value[0];
-                            }
-                        } else {
-                            val = arg;
-                        }
-
-                        if (val && val instanceof tree.Variable) {
-                            if ($char(':')) {
-                                if (expressions.length > 0) {
-                                    if (isSemiColonSeperated) {
-                                        error("Cannot mix ; and , as delimiter types");
-                                    }
-                                    expressionContainsNamed = true;
-                                }
-
-                                // we do not support setting a ruleset as a default variable - it doesn't make sense
-                                // However if we do want to add it, there is nothing blocking it, just don't error
-                                // and remove isCall dependency below
-                                value = (isCall && parsers.detachedRuleset()) || parsers.expression();
-
-                                if (!value) {
-                                    if (isCall) {
-                                        error("could not understand value for named argument");
-                                    } else {
-                                        restore();
-                                        returner.args = [];
-                                        return returner;
-                                    }
-                                }
-                                nameLoop = (name = val.name);
-                            } else if (!isCall && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ name: arg.name, variadic: true });
-                                break;
-                            } else if (!isCall) {
-                                name = nameLoop = val.name;
-                                value = null;
-                            }
-                        }
-
-                        if (value) {
-                            expressions.push(value);
-                        }
-
-                        argsComma.push({ name:nameLoop, value:value });
-
-                        if ($char(',')) {
-                            continue;
-                        }
-
-                        if ($char(';') || isSemiColonSeperated) {
-
-                            if (expressionContainsNamed) {
-                                error("Cannot mix ; and , as delimiter types");
-                            }
-
-                            isSemiColonSeperated = true;
-
-                            if (expressions.length > 1) {
-                                value = new(tree.Value)(expressions);
-                            }
-                            argsSemiColon.push({ name:name, value:value });
-
-                            name = null;
-                            expressions = [];
-                            expressionContainsNamed = false;
-                        }
-                    }
-
-                    forget();
-                    returner.args = isSemiColonSeperated ? argsSemiColon : argsComma;
-                    return returner;
-                },
-                //
-                // A Mixin definition, with a list of parameters
-                //
-                //     .rounded (@radius: 2px, @color) {
-                //        ...
-                //     }
-                //
-                // Until we have a finer grained state-machine, we have to
-                // do a look-ahead, to make sure we don't have a mixin call.
-                // See the `rule` function for more information.
-                //
-                // We start by matching `.rounded (`, and then proceed on to
-                // the argument list, which has optional default values.
-                // We store the parameters in `params`, with a `value` key,
-                // if there is a value, such as in the case of `@radius`.
-                //
-                // Once we've got our params list, and a closing `)`, we parse
-                // the `{...}` block.
-                //
-                definition: function () {
-                    var name, params = [], match, ruleset, cond, variadic = false;
-                    if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
-                        peek(/^[^{]*\}/)) {
-                        return;
-                    }
-
-                    save();
-
-                    match = $re(/^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/);
-                    if (match) {
-                        name = match[1];
-
-                        var argInfo = this.args(false);
-                        params = argInfo.args;
-                        variadic = argInfo.variadic;
-
-                        // .mixincall("@{a}");
-                        // looks a bit like a mixin definition..
-                        // also
-                        // .mixincall(@a: {rule: set;});
-                        // so we have to be nice and restore
-                        if (!$char(')')) {
-                            furthest = i;
-                            restore();
-                            return;
-                        }
-
-                        parsers.comments();
-
-                        if ($re(/^when/)) { // Guard
-                            cond = expect(parsers.conditions, 'expected condition');
-                        }
-
-                        ruleset = parsers.block();
-
-                        if (ruleset) {
-                            forget();
-                            return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);
-                        } else {
-                            restore();
-                        }
-                    } else {
-                        forget();
-                    }
-                }
-            },
-
-            //
-            // Entities are the smallest recognized token,
-            // and can be found inside a rule's value.
-            //
-            entity: function () {
-                var entities = this.entities;
-
-                return entities.literal() || entities.variable() || entities.url() ||
-                       entities.call()    || entities.keyword()  || entities.javascript() ||
-                       this.comment();
-            },
-
-            //
-            // A Rule terminator. Note that we use `peek()` to check for '}',
-            // because the `block` rule will be expecting it, but we still need to make sure
-            // it's there, if ';' was ommitted.
-            //
-            end: function () {
-                return $char(';') || peekChar('}');
-            },
-
-            //
-            // IE's alpha function
-            //
-            //     alpha(opacity=88)
-            //
-            alpha: function () {
-                var value;
-
-                if (! $re(/^\(opacity=/i)) { return; }
-                value = $re(/^\d+/) || this.entities.variable();
-                if (value) {
-                    expectChar(')');
-                    return new(tree.Alpha)(value);
-                }
-            },
-
-            //
-            // A Selector Element
-            //
-            //     div
-            //     + h1
-            //     #socks
-            //     input[type="text"]
-            //
-            // Elements are the building blocks for Selectors,
-            // they are made out of a `Combinator` (see combinator rule),
-            // and an element name, such as a tag a class, or `*`.
-            //
-            element: function () {
-                var e, c, v, index = i;
-
-                c = this.combinator();
-
-                e = $re(/^(?:\d+\.\d+|\d+)%/) || $re(/^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||
-                    $char('*') || $char('&') || this.attribute() || $re(/^\([^()@]+\)/) || $re(/^[\.#](?=@)/) ||
-                    this.entities.variableCurly();
-
-                if (! e) {
-                    save();
-                    if ($char('(')) {
-                        if ((v = this.selector()) && $char(')')) {
-                            e = new(tree.Paren)(v);
-                            forget();
-                        } else {
-                            restore();
-                        }
-                    } else {
-                        forget();
-                    }
-                }
-
-                if (e) { return new(tree.Element)(c, e, index, env.currentFileInfo); }
-            },
-
-            //
-            // Combinators combine elements together, in a Selector.
-            //
-            // Because our parser isn't white-space sensitive, special care
-            // has to be taken, when parsing the descendant combinator, ` `,
-            // as it's an empty space. We have to check the previous character
-            // in the input, to see if it's a ` ` character. More info on how
-            // we deal with this in *combinator.js*.
-            //
-            combinator: function () {
-                var c = input.charAt(i);
-
-                if (c === '>' || c === '+' || c === '~' || c === '|' || c === '^') {
-                    i++;
-                    if (input.charAt(i) === '^') {
-                        c = '^^';
-                        i++;
-                    }
-                    while (isWhitespace(input, i)) { i++; }
-                    return new(tree.Combinator)(c);
-                } else if (isWhitespace(input, i - 1)) {
-                    return new(tree.Combinator)(" ");
-                } else {
-                    return new(tree.Combinator)(null);
-                }
-            },
-            //
-            // A CSS selector (see selector below)
-            // with less extensions e.g. the ability to extend and guard
-            //
-            lessSelector: function () {
-                return this.selector(true);
-            },
-            //
-            // A CSS Selector
-            //
-            //     .class > div + h1
-            //     li a:hover
-            //
-            // Selectors are made out of one or more Elements, see above.
-            //
-            selector: function (isLess) {
-                var index = i, $re = _$re, elements, extendList, c, e, extend, when, condition;
-
-                while ((isLess && (extend = this.extend())) || (isLess && (when = $re(/^when/))) || (e = this.element())) {
-                    if (when) {
-                        condition = expect(this.conditions, 'expected condition');
-                    } else if (condition) {
-                        error("CSS guard can only be used at the end of selector");
-                    } else if (extend) {
-                        if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-                    } else {
-                        if (extendList) { error("Extend can only be used at the end of selector"); }
-                        c = input.charAt(i);
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                        e = null;
-                    }
-                    if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') {
-                        break;
-                    }
-                }
-
-                if (elements) { return new(tree.Selector)(elements, extendList, condition, index, env.currentFileInfo); }
-                if (extendList) { error("Extend must be used to extend a selector, it cannot be used on its own"); }
-            },
-            attribute: function () {
-                if (! $char('[')) { return; }
-
-                var entities = this.entities,
-                    key, val, op;
-
-                if (!(key = entities.variableCurly())) {
-                    key = expect(/^(?:[_A-Za-z0-9-\*]*\|)?(?:[_A-Za-z0-9-]|\\.)+/);
-                }
-
-                op = $re(/^[|~*$^]?=/);
-                if (op) {
-                    val = entities.quoted() || $re(/^[0-9]+%/) || $re(/^[\w-]+/) || entities.variableCurly();
-                }
-
-                expectChar(']');
-
-                return new(tree.Attribute)(key, op, val);
-            },
-
-            //
-            // The `block` rule is used by `ruleset` and `mixin.definition`.
-            // It's a wrapper around the `primary` rule, with added `{}`.
-            //
-            block: function () {
-                var content;
-                if ($char('{') && (content = this.primary()) && $char('}')) {
-                    return content;
-                }
-            },
-
-            blockRuleset: function() {
-                var block = this.block();
-
-                if (block) {
-                    block = new tree.Ruleset(null, block);
-                }
-                return block;
-            },
-
-            detachedRuleset: function() {
-                var blockRuleset = this.blockRuleset();
-                if (blockRuleset) {
-                    return new tree.DetachedRuleset(blockRuleset);
-                }
-            },
-
-            //
-            // div, .class, body > p {...}
-            //
-            ruleset: function () {
-                var selectors, s, rules, debugInfo;
-
-                save();
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                while (true) {
-                    s = this.lessSelector();
-                    if (!s) {
-                        break;
-                    }
-                    if (selectors) { selectors.push(s); } else { selectors = [ s ]; }
-                    this.comments();
-                    if (s.condition && selectors.length > 1) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    if (! $char(',')) { break; }
-                    if (s.condition) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    this.comments();
-                }
-
-                if (selectors && (rules = this.block())) {
-                    forget();
-                    var ruleset = new(tree.Ruleset)(selectors, rules, env.strictImports);
-                    if (env.dumpLineNumbers) {
-                        ruleset.debugInfo = debugInfo;
-                    }
-                    return ruleset;
-                } else {
-                    // Backtrack
-                    furthest = i;
-                    restore();
-                }
-            },
-            rule: function (tryAnonymous) {
-                var name, value, startOfRule = i, c = input.charAt(startOfRule), important, merge, isVariable;
-
-                if (c === '.' || c === '#' || c === '&') { return; }
-
-                save();
-
-                name = this.variable() || this.ruleProperty();
-                if (name) {
-                    isVariable = typeof name === "string";
-
-                    if (isVariable) {
-                        value = this.detachedRuleset();
-                    }
-
-                    if (!value) {
-                        // prefer to try to parse first if its a variable or we are compressing
-                        // but always fallback on the other one
-                        value = !tryAnonymous && (env.compress || isVariable) ?
-                            (this.value() || this.anonymousValue()) :
-                            (this.anonymousValue() || this.value());
-
-                        important = this.important();
-
-                        // a name returned by this.ruleProperty() is always an array of the form:
-                        // [string-1, ..., string-n, ""] or [string-1, ..., string-n, "+"]
-                        // where each item is a tree.Keyword or tree.Variable
-                        merge = !isVariable && name.pop().value;
-                    }
-
-                    if (value && this.end()) {
-                        forget();
-                        return new (tree.Rule)(name, value, important, merge, startOfRule, env.currentFileInfo);
-                    } else {
-                        furthest = i;
-                        restore();
-                        if (value && !tryAnonymous) {
-                            return this.rule(true);
-                        }
-                    }
-                } else {
-                    forget();
-                }
-            },
-            anonymousValue: function () {
-                var match;
-                match = /^([^@+\/'"*`(;{}-]*);/.exec(current);
-                if (match) {
-                    i += match[0].length - 1;
-                    return new(tree.Anonymous)(match[1]);
-                }
-            },
-
-            //
-            // An @import directive
-            //
-            //     @import "lib";
-            //
-            // Depending on our environemnt, importing is done differently:
-            // In the browser, it's an XHR request, in Node, it would be a
-            // file-system operation. The function used for importing is
-            // stored in `import`, which we pass to the Import constructor.
-            //
-            "import": function () {
-                var path, features, index = i;
-
-                save();
-
-                var dir = $re(/^@import?\s+/);
-
-                var options = (dir ? this.importOptions() : null) || {};
-
-                if (dir && (path = this.entities.quoted() || this.entities.url())) {
-                    features = this.mediaFeatures();
-                    if ($char(';')) {
-                        forget();
-                        features = features && new(tree.Value)(features);
-                        return new(tree.Import)(path, features, options, index, env.currentFileInfo);
-                    }
-                }
-
-                restore();
-            },
-
-            importOptions: function() {
-                var o, options = {}, optionName, value;
-
-                // list of options, surrounded by parens
-                if (! $char('(')) { return null; }
-                do {
-                    o = this.importOption();
-                    if (o) {
-                        optionName = o;
-                        value = true;
-                        switch(optionName) {
-                            case "css":
-                                optionName = "less";
-                                value = false;
-                            break;
-                            case "once":
-                                optionName = "multiple";
-                                value = false;
-                            break;
-                        }
-                        options[optionName] = value;
-                        if (! $char(',')) { break; }
-                    }
-                } while (o);
-                expectChar(')');
-                return options;
-            },
-
-            importOption: function() {
-                var opt = $re(/^(less|css|multiple|once|inline|reference)/);
-                if (opt) {
-                    return opt[1];
-                }
-            },
-
-            mediaFeature: function () {
-                var entities = this.entities, nodes = [], e, p;
-                do {
-                    e = entities.keyword() || entities.variable();
-                    if (e) {
-                        nodes.push(e);
-                    } else if ($char('(')) {
-                        p = this.property();
-                        e = this.value();
-                        if ($char(')')) {
-                            if (p && e) {
-                                nodes.push(new(tree.Paren)(new(tree.Rule)(p, e, null, null, i, env.currentFileInfo, true)));
-                            } else if (e) {
-                                nodes.push(new(tree.Paren)(e));
-                            } else {
-                                return null;
-                            }
-                        } else { return null; }
-                    }
-                } while (e);
-
-                if (nodes.length > 0) {
-                    return new(tree.Expression)(nodes);
-                }
-            },
-
-            mediaFeatures: function () {
-                var entities = this.entities, features = [], e;
-                do {
-                    e = this.mediaFeature();
-                    if (e) {
-                        features.push(e);
-                        if (! $char(',')) { break; }
-                    } else {
-                        e = entities.variable();
-                        if (e) {
-                            features.push(e);
-                            if (! $char(',')) { break; }
-                        }
-                    }
-                } while (e);
-
-                return features.length > 0 ? features : null;
-            },
-
-            media: function () {
-                var features, rules, media, debugInfo;
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                if ($re(/^@media/)) {
-                    features = this.mediaFeatures();
-
-                    rules = this.block();
-                    if (rules) {
-                        media = new(tree.Media)(rules, features, i, env.currentFileInfo);
-                        if (env.dumpLineNumbers) {
-                            media.debugInfo = debugInfo;
-                        }
-                        return media;
-                    }
-                }
-            },
-
-            //
-            // A CSS Directive
-            //
-            //     @charset "utf-8";
-            //
-            directive: function () {
-                var index = i, name, value, rules, nonVendorSpecificName,
-                    hasIdentifier, hasExpression, hasUnknown, hasBlock = true;
-
-                if (input.charAt(i) !== '@') { return; }
-
-                value = this['import']() || this.media();
-                if (value) {
-                    return value;
-                }
-
-                save();
-
-                name = $re(/^@[a-z-]+/);
-
-                if (!name) { return; }
-
-                nonVendorSpecificName = name;
-                if (name.charAt(1) == '-' && name.indexOf('-', 2) > 0) {
-                    nonVendorSpecificName = "@" + name.slice(name.indexOf('-', 2) + 1);
-                }
-
-                switch(nonVendorSpecificName) {
-                    /*
-                    case "@font-face":
-                    case "@viewport":
-                    case "@top-left":
-                    case "@top-left-corner":
-                    case "@top-center":
-                    case "@top-right":
-                    case "@top-right-corner":
-                    case "@bottom-left":
-                    case "@bottom-left-corner":
-                    case "@bottom-center":
-                    case "@bottom-right":
-                    case "@bottom-right-corner":
-                    case "@left-top":
-                    case "@left-middle":
-                    case "@left-bottom":
-                    case "@right-top":
-                    case "@right-middle":
-                    case "@right-bottom":
-                        hasBlock = true;
-                        break;
-                    */
-                    case "@charset":
-                        hasIdentifier = true;
-                        hasBlock = false;
-                        break;
-                    case "@namespace":
-                        hasExpression = true;
-                        hasBlock = false;
-                        break;
-                    case "@keyframes":
-                        hasIdentifier = true;
-                        break;
-                    case "@host":
-                    case "@page":
-                    case "@document":
-                    case "@supports":
-                        hasUnknown = true;
-                        break;
-                }
-
-                if (hasIdentifier) {
-                    value = this.entity();
-                    if (!value) {
-                        error("expected " + name + " identifier");
-                    }
-                } else if (hasExpression) {
-                    value = this.expression();
-                    if (!value) {
-                        error("expected " + name + " expression");
-                    }
-                } else if (hasUnknown) {
-                    value = ($re(/^[^{;]+/) || '').trim();
-                    if (value) {
-                        value = new(tree.Anonymous)(value);
-                    }
-                }
-
-                if (hasBlock) {
-                    rules = this.blockRuleset();
-                }
-
-                if (rules || (!hasBlock && value && $char(';'))) {
-                    forget();
-                    return new(tree.Directive)(name, value, rules, index, env.currentFileInfo,
-                        env.dumpLineNumbers ? getDebugInfo(index, input, env) : null);
-                }
-
-                restore();
-            },
-
-            //
-            // A Value is a comma-delimited list of Expressions
-            //
-            //     font-family: Baskerville, Georgia, serif;
-            //
-            // In a Rule, a Value represents everything after the `:`,
-            // and before the `;`.
-            //
-            value: function () {
-                var e, expressions = [];
-
-                do {
-                    e = this.expression();
-                    if (e) {
-                        expressions.push(e);
-                        if (! $char(',')) { break; }
-                    }
-                } while(e);
-
-                if (expressions.length > 0) {
-                    return new(tree.Value)(expressions);
-                }
-            },
-            important: function () {
-                if (input.charAt(i) === '!') {
-                    return $re(/^! *important/);
-                }
-            },
-            sub: function () {
-                var a, e;
-
-                if ($char('(')) {
-                    a = this.addition();
-                    if (a) {
-                        e = new(tree.Expression)([a]);
-                        expectChar(')');
-                        e.parens = true;
-                        return e;
-                    }
-                }
-            },
-            multiplication: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.operand();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        if (peek(/^\/[*\/]/)) {
-                            break;
-                        }
-                        op = $char('/') || $char('*');
-
-                        if (!op) { break; }
-
-                        a = this.operand();
-
-                        if (!a) { break; }
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            addition: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.multiplication();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        op = $re(/^[-+]\s+/) || (!isSpaced && ($char('+') || $char('-')));
-                        if (!op) {
-                            break;
-                        }
-                        a = this.multiplication();
-                        if (!a) {
-                            break;
-                        }
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            conditions: function () {
-                var a, b, index = i, condition;
-
-                a = this.condition();
-                if (a) {
-                    while (true) {
-                        if (!peek(/^,\s*(not\s*)?\(/) || !$char(',')) {
-                            break;
-                        }
-                        b = this.condition();
-                        if (!b) {
-                            break;
-                        }
-                        condition = new(tree.Condition)('or', condition || a, b, index);
-                    }
-                    return condition || a;
-                }
-            },
-            condition: function () {
-                var entities = this.entities, index = i, negate = false,
-                    a, b, c, op;
-
-                if ($re(/^not/)) { negate = true; }
-                expectChar('(');
-                a = this.addition() || entities.keyword() || entities.quoted();
-                if (a) {
-                    op = $re(/^(?:>=|<=|=<|[<=>])/);
-                    if (op) {
-                        b = this.addition() || entities.keyword() || entities.quoted();
-                        if (b) {
-                            c = new(tree.Condition)(op, a, b, index, negate);
-                        } else {
-                            error('expected expression');
-                        }
-                    } else {
-                        c = new(tree.Condition)('=', a, new(tree.Keyword)('true'), index, negate);
-                    }
-                    expectChar(')');
-                    return $re(/^and/) ? new(tree.Condition)('and', c, this.condition()) : c;
-                }
-            },
-
-            //
-            // An operand is anything that can be part of an operation,
-            // such as a Color, or a Variable
-            //
-            operand: function () {
-                var entities = this.entities,
-                    p = input.charAt(i + 1), negate;
-
-                if (input.charAt(i) === '-' && (p === '@' || p === '(')) { negate = $char('-'); }
-                var o = this.sub() || entities.dimension() ||
-                        entities.color() || entities.variable() ||
-                        entities.call();
-
-                if (negate) {
-                    o.parensInOp = true;
-                    o = new(tree.Negative)(o);
-                }
-
-                return o;
-            },
-
-            //
-            // Expressions either represent mathematical operations,
-            // or white-space delimited Entities.
-            //
-            //     1px solid black
-            //     @var * 2
-            //
-            expression: function () {
-                var entities = [], e, delim;
-
-                do {
-                    e = this.addition() || this.entity();
-                    if (e) {
-                        entities.push(e);
-                        // operations do not allow keyword "/" dimension (e.g. small/20px) so we support that here
-                        if (!peek(/^\/[\/*]/)) {
-                            delim = $char('/');
-                            if (delim) {
-                                entities.push(new(tree.Anonymous)(delim));
-                            }
-                        }
-                    }
-                } while (e);
-                if (entities.length > 0) {
-                    return new(tree.Expression)(entities);
-                }
-            },
-            property: function () {
-                var name = $re(/^(\*?-?[_a-zA-Z0-9-]+)\s*:/);
-                if (name) {
-                    return name[1];
-                }
-            },
-            ruleProperty: function () {
-                var c = current, name = [], index = [], length = 0, s, k;
-
-                function match(re) {
-                    var a = re.exec(c);
-                    if (a) {
-                        index.push(i + length);
-                        length += a[0].length;
-                        c = c.slice(a[1].length);
-                        return name.push(a[1]);
-                    }
-                }
-
-                match(/^(\*?)/);
-                while (match(/^((?:[\w-]+)|(?:@\{[\w-]+\}))/)); // !
-                if ((name.length > 1) && match(/^\s*((?:\+_|\+)?)\s*:/)) {
-                    // at last, we have the complete match now. move forward,
-                    // convert name particles to tree objects and return:
-                    skipWhitespace(length);
-                    if (name[0] === '') {
-                        name.shift();
-                        index.shift();
-                    }
-                    for (k = 0; k < name.length; k++) {
-                        s = name[k];
-                        name[k] = (s.charAt(0) !== '@')
-                            ? new(tree.Keyword)(s)
-                            : new(tree.Variable)('@' + s.slice(2, -1),
-                                index[k], env.currentFileInfo);
-                    }
-                    return name;
-                }
-            }
-        }
-    };
-    return parser;
-};
-less.Parser.serializeVars = function(vars) {
-    var s = '';
-
-    for (var name in vars) {
-        if (Object.hasOwnProperty.call(vars, name)) {
-            var value = vars[name];
-            s += ((name[0] === '@') ? '' : '@') + name +': '+ value +
-                    ((('' + value).slice(-1) === ';') ? '' : ';');
-        }
-    }
-
-    return s;
-};
-
-(function (tree) {
-
-tree.functions = {
-    rgb: function (r, g, b) {
-        return this.rgba(r, g, b, 1.0);
-    },
-    rgba: function (r, g, b, a) {
-        var rgb = [r, g, b].map(function (c) { return scaled(c, 255); });
-        a = number(a);
-        return new(tree.Color)(rgb, a);
-    },
-    hsl: function (h, s, l) {
-        return this.hsla(h, s, l, 1.0);
-    },
-    hsla: function (h, s, l, a) {
-        function hue(h) {
-            h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
-            if      (h * 6 < 1) { return m1 + (m2 - m1) * h * 6; }
-            else if (h * 2 < 1) { return m2; }
-            else if (h * 3 < 2) { return m1 + (m2 - m1) * (2/3 - h) * 6; }
-            else                { return m1; }
-        }
-
-        h = (number(h) % 360) / 360;
-        s = clamp(number(s)); l = clamp(number(l)); a = clamp(number(a));
-
-        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
-        var m1 = l * 2 - m2;
-
-        return this.rgba(hue(h + 1/3) * 255,
-                         hue(h)       * 255,
-                         hue(h - 1/3) * 255,
-                         a);
-    },
-
-    hsv: function(h, s, v) {
-        return this.hsva(h, s, v, 1.0);
-    },
-
-    hsva: function(h, s, v, a) {
-        h = ((number(h) % 360) / 360) * 360;
-        s = number(s); v = number(v); a = number(a);
-
-        var i, f;
-        i = Math.floor((h / 60) % 6);
-        f = (h / 60) - i;
-
-        var vs = [v,
-                  v * (1 - s),
-                  v * (1 - f * s),
-                  v * (1 - (1 - f) * s)];
-        var perm = [[0, 3, 1],
-                    [2, 0, 1],
-                    [1, 0, 3],
-                    [1, 2, 0],
-                    [3, 1, 0],
-                    [0, 1, 2]];
-
-        return this.rgba(vs[perm[i][0]] * 255,
-                         vs[perm[i][1]] * 255,
-                         vs[perm[i][2]] * 255,
-                         a);
-    },
-
-    hue: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().h));
-    },
-    saturation: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().s * 100), '%');
-    },
-    lightness: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().l * 100), '%');
-    },
-    hsvhue: function(color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().h));
-    },
-    hsvsaturation: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().s * 100), '%');
-    },
-    hsvvalue: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().v * 100), '%');
-    },
-    red: function (color) {
-        return new(tree.Dimension)(color.rgb[0]);
-    },
-    green: function (color) {
-        return new(tree.Dimension)(color.rgb[1]);
-    },
-    blue: function (color) {
-        return new(tree.Dimension)(color.rgb[2]);
-    },
-    alpha: function (color) {
-        return new(tree.Dimension)(color.toHSL().a);
-    },
-    luma: function (color) {
-        return new(tree.Dimension)(Math.round(color.luma() * color.alpha * 100), '%');
-    },
-    luminance: function (color) {
-        var luminance =
-            (0.2126 * color.rgb[0] / 255)
-          + (0.7152 * color.rgb[1] / 255)
-          + (0.0722 * color.rgb[2] / 255);
-
-        return new(tree.Dimension)(Math.round(luminance * color.alpha * 100), '%');
-    },
-    saturate: function (color, amount) {
-        // filter: saturate(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        var hsl = color.toHSL();
-
-        hsl.s += amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    desaturate: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.s -= amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    lighten: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l += amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    darken: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l -= amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    fadein: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a += amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fadeout: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a -= amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fade: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a = amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    spin: function (color, amount) {
-        var hsl = color.toHSL();
-        var hue = (hsl.h + amount.value) % 360;
-
-        hsl.h = hue < 0 ? 360 + hue : hue;
-
-        return hsla(hsl);
-    },
-    //
-    // Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
-    // http://sass-lang.com
-    //
-    mix: function (color1, color2, weight) {
-        if (!weight) {
-            weight = new(tree.Dimension)(50);
-        }
-        var p = weight.value / 100.0;
-        var w = p * 2 - 1;
-        var a = color1.toHSL().a - color2.toHSL().a;
-
-        var w1 = (((w * a == -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
-        var w2 = 1 - w1;
-
-        var rgb = [color1.rgb[0] * w1 + color2.rgb[0] * w2,
-                   color1.rgb[1] * w1 + color2.rgb[1] * w2,
-                   color1.rgb[2] * w1 + color2.rgb[2] * w2];
-
-        var alpha = color1.alpha * p + color2.alpha * (1 - p);
-
-        return new(tree.Color)(rgb, alpha);
-    },
-    greyscale: function (color) {
-        return this.desaturate(color, new(tree.Dimension)(100));
-    },
-    contrast: function (color, dark, light, threshold) {
-        // filter: contrast(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        if (typeof light === 'undefined') {
-            light = this.rgba(255, 255, 255, 1.0);
-        }
-        if (typeof dark === 'undefined') {
-            dark = this.rgba(0, 0, 0, 1.0);
-        }
-        //Figure out which is actually light and dark!
-        if (dark.luma() > light.luma()) {
-            var t = light;
-            light = dark;
-            dark = t;
-        }
-        if (typeof threshold === 'undefined') {
-            threshold = 0.43;
-        } else {
-            threshold = number(threshold);
-        }
-        if (color.luma() < threshold) {
-            return light;
-        } else {
-            return dark;
-        }
-    },
-    e: function (str) {
-        return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str);
-    },
-    escape: function (str) {
-        return new(tree.Anonymous)(encodeURI(str.value).replace(/=/g, "%3D").replace(/:/g, "%3A").replace(/#/g, "%23").replace(/;/g, "%3B").replace(/\(/g, "%28").replace(/\)/g, "%29"));
-    },
-    replace: function (string, pattern, replacement, flags) {
-        var result = string.value;
-
-        result = result.replace(new RegExp(pattern.value, flags ? flags.value : ''), replacement.value);
-        return new(tree.Quoted)(string.quote || '', result, string.escaped);
-    },
-    '%': function (string /* arg, arg, ...*/) {
-        var args = Array.prototype.slice.call(arguments, 1),
-            result = string.value;
-
-        for (var i = 0; i < args.length; i++) {
-            /*jshint loopfunc:true */
-            result = result.replace(/%[sda]/i, function(token) {
-                var value = token.match(/s/i) ? args[i].value : args[i].toCSS();
-                return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
-            });
-        }
-        result = result.replace(/%%/g, '%');
-        return new(tree.Quoted)(string.quote || '', result, string.escaped);
-    },
-    unit: function (val, unit) {
-        if(!(val instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "the first argument to unit must be a number" + (val instanceof tree.Operation ? ". Have you forgotten parenthesis?" : "") };
-        }
-        if (unit) {
-            if (unit instanceof tree.Keyword) {
-                unit = unit.value;
-            } else {
-                unit = unit.toCSS();
-            }
-        } else {
-            unit = "";
-        }
-        return new(tree.Dimension)(val.value, unit);
-    },
-    convert: function (val, unit) {
-        return val.convertTo(unit.value);
-    },
-    round: function (n, f) {
-        var fraction = typeof(f) === "undefined" ? 0 : f.value;
-        return _math(function(num) { return num.toFixed(fraction); }, null, n);
-    },
-    pi: function () {
-        return new(tree.Dimension)(Math.PI);
-    },
-    mod: function(a, b) {
-        return new(tree.Dimension)(a.value % b.value, a.unit);
-    },
-    pow: function(x, y) {
-        if (typeof x === "number" && typeof y === "number") {
-            x = new(tree.Dimension)(x);
-            y = new(tree.Dimension)(y);
-        } else if (!(x instanceof tree.Dimension) || !(y instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "arguments must be numbers" };
-        }
-
-        return new(tree.Dimension)(Math.pow(x.value, y.value), x.unit);
-    },
-    _minmax: function (isMin, args) {
-        args = Array.prototype.slice.call(args);
-        switch(args.length) {
-            case 0: throw { type: "Argument", message: "one or more arguments required" };
-        }
-        var i, j, current, currentUnified, referenceUnified, unit, unitStatic, unitClone,
-            order  = [], // elems only contains original argument values.
-            values = {}; // key is the unit.toString() for unified tree.Dimension values,
-                         // value is the index into the order array.
-        for (i = 0; i < args.length; i++) {
-            current = args[i];
-            if (!(current instanceof tree.Dimension)) {
-                if(Array.isArray(args[i].value)) {
-                    Array.prototype.push.apply(args, Array.prototype.slice.call(args[i].value));
-                }
-                continue;
-            }
-            currentUnified = current.unit.toString() === "" && unitClone !== undefined ? new(tree.Dimension)(current.value, unitClone).unify() : current.unify();
-            unit = currentUnified.unit.toString() === "" && unitStatic !== undefined ? unitStatic : currentUnified.unit.toString();
-            unitStatic = unit !== "" && unitStatic === undefined || unit !== "" && order[0].unify().unit.toString() === "" ? unit : unitStatic;
-            unitClone = unit !== "" && unitClone === undefined ? current.unit.toString() : unitClone;
-            j = values[""] !== undefined && unit !== "" && unit === unitStatic ? values[""] : values[unit];
-            if (j === undefined) {
-                if(unitStatic !== undefined && unit !== unitStatic) {
-                    throw{ type: "Argument", message: "incompatible types" };
-                }
-                values[unit] = order.length;
-                order.push(current);
-                continue;
-            }
-            referenceUnified = order[j].unit.toString() === "" && unitClone !== undefined ? new(tree.Dimension)(order[j].value, unitClone).unify() : order[j].unify();
-            if ( isMin && currentUnified.value < referenceUnified.value ||
-                !isMin && currentUnified.value > referenceUnified.value) {
-                order[j] = current;
-            }
-        }
-        if (order.length == 1) {
-            return order[0];
-        }
-        args = order.map(function (a) { return a.toCSS(this.env); }).join(this.env.compress ? "," : ", ");
-        return new(tree.Anonymous)((isMin ? "min" : "max") + "(" + args + ")");
-    },
-    min: function () {
-        return this._minmax(true, arguments);
-    },
-    max: function () {
-        return this._minmax(false, arguments);
-    },
-    "get-unit": function (n) {
-        return new(tree.Anonymous)(n.unit);
-    },
-    argb: function (color) {
-        return new(tree.Anonymous)(color.toARGB());
-    },
-    percentage: function (n) {
-        return new(tree.Dimension)(n.value * 100, '%');
-    },
-    color: function (n) {
-        if (n instanceof tree.Quoted) {
-            var colorCandidate = n.value,
-                returnColor;
-            returnColor = tree.Color.fromKeyword(colorCandidate);
-            if (returnColor) {
-                return returnColor;
-            }
-            if (/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/.test(colorCandidate)) {
-                return new(tree.Color)(colorCandidate.slice(1));
-            }
-            throw { type: "Argument", message: "argument must be a color keyword or 3/6 digit hex e.g. #FFF" };
-        } else {
-            throw { type: "Argument", message: "argument must be a string" };
-        }
-    },
-    iscolor: function (n) {
-        return this._isa(n, tree.Color);
-    },
-    isnumber: function (n) {
-        return this._isa(n, tree.Dimension);
-    },
-    isstring: function (n) {
-        return this._isa(n, tree.Quoted);
-    },
-    iskeyword: function (n) {
-        return this._isa(n, tree.Keyword);
-    },
-    isurl: function (n) {
-        return this._isa(n, tree.URL);
-    },
-    ispixel: function (n) {
-        return this.isunit(n, 'px');
-    },
-    ispercentage: function (n) {
-        return this.isunit(n, '%');
-    },
-    isem: function (n) {
-        return this.isunit(n, 'em');
-    },
-    isunit: function (n, unit) {
-        return (n instanceof tree.Dimension) && n.unit.is(unit.value || unit) ? tree.True : tree.False;
-    },
-    _isa: function (n, Type) {
-        return (n instanceof Type) ? tree.True : tree.False;
-    },
-    tint: function(color, amount) {
-        return this.mix(this.rgb(255,255,255), color, amount);
-    },
-    shade: function(color, amount) {
-        return this.mix(this.rgb(0, 0, 0), color, amount);
-    },
-    extract: function(values, index) {
-        index = index.value - 1; // (1-based index)
-        // handle non-array values as an array of length 1
-        // return 'undefined' if index is invalid
-        return Array.isArray(values.value)
-            ? values.value[index] : Array(values)[index];
-    },
-    length: function(values) {
-        var n = Array.isArray(values.value) ? values.value.length : 1;
-        return new tree.Dimension(n);
-    },
-
-    "data-uri": function(mimetypeNode, filePathNode) {
-
-        if (typeof window !== 'undefined') {
-            return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-        }
-
-        var mimetype = mimetypeNode.value;
-        var filePath = (filePathNode && filePathNode.value);
-
-        var fs = require('fs'),
-            path = require('path'),
-            useBase64 = false;
-
-        if (arguments.length < 2) {
-            filePath = mimetype;
-        }
-
-        if (this.env.isPathRelative(filePath)) {
-            if (this.currentFileInfo.relativeUrls) {
-                filePath = path.join(this.currentFileInfo.currentDirectory, filePath);
-            } else {
-                filePath = path.join(this.currentFileInfo.entryPath, filePath);
-            }
-        }
-
-        // detect the mimetype if not given
-        if (arguments.length < 2) {
-            var mime;
-            try {
-                mime = require('mime');
-            } catch (ex) {
-                mime = tree._mime;
-            }
-
-            mimetype = mime.lookup(filePath);
-
-            // use base 64 unless it's an ASCII or UTF-8 format
-            var charset = mime.charsets.lookup(mimetype);
-            useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
-            if (useBase64) { mimetype += ';base64'; }
-        }
-        else {
-            useBase64 = /;base64$/.test(mimetype);
-        }
-
-        var buf = fs.readFileSync(filePath);
-
-        // IE8 cannot handle a data-uri larger than 32KB. If this is exceeded
-        // and the --ieCompat flag is enabled, return a normal url() instead.
-        var DATA_URI_MAX_KB = 32,
-            fileSizeInKB = parseInt((buf.length / 1024), 10);
-        if (fileSizeInKB >= DATA_URI_MAX_KB) {
-
-            if (this.env.ieCompat !== false) {
-                if (!this.env.silent) {
-                    console.warn("Skipped data-uri embedding of %s because its size (%dKB) exceeds IE8-safe %dKB!", filePath, fileSizeInKB, DATA_URI_MAX_KB);
-                }
-
-                return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-            }
-        }
-
-        buf = useBase64 ? buf.toString('base64')
-                        : encodeURIComponent(buf);
-
-        var uri = "\"data:" + mimetype + ',' + buf + "\"";
-        return new(tree.URL)(new(tree.Anonymous)(uri));
-    },
-
-    "svg-gradient": function(direction) {
-
-        function throwArgumentDescriptor() {
-            throw { type: "Argument", message: "svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position]" };
-        }
-
-        if (arguments.length < 3) {
-            throwArgumentDescriptor();
-        }
-        var stops = Array.prototype.slice.call(arguments, 1),
-            gradientDirectionSvg,
-            gradientType = "linear",
-            rectangleDimension = 'x="0" y="0" width="1" height="1"',
-            useBase64 = true,
-            renderEnv = {compress: false},
-            returner,
-            directionValue = direction.toCSS(renderEnv),
-            i, color, position, positionValue, alpha;
-
-        switch (directionValue) {
-            case "to bottom":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
-                break;
-            case "to right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
-                break;
-            case "to bottom right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
-                break;
-            case "to top right":
-                gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
-                break;
-            case "ellipse":
-            case "ellipse at center":
-                gradientType = "radial";
-                gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
-                rectangleDimension = 'x="-50" y="-50" width="101" height="101"';
-                break;
-            default:
-                throw { type: "Argument", message: "svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" };
-        }
-        returner = '<?xml version="1.0" ?>' +
-            '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' +
-            '<' + gradientType + 'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' + gradientDirectionSvg + '>';
-
-        for (i = 0; i < stops.length; i+= 1) {
-            if (stops[i].value) {
-                color = stops[i].value[0];
-                position = stops[i].value[1];
-            } else {
-                color = stops[i];
-                position = undefined;
-            }
-
-            if (!(color instanceof tree.Color) || (!((i === 0 || i+1 === stops.length) && position === undefined) && !(position instanceof tree.Dimension))) {
-                throwArgumentDescriptor();
-            }
-            positionValue = position ? position.toCSS(renderEnv) : i === 0 ? "0%" : "100%";
-            alpha = color.alpha;
-            returner += '<stop offset="' + positionValue + '" stop-color="' + color.toRGB() + '"' + (alpha < 1 ? ' stop-opacity="' + alpha + '"' : '') + '/>';
-        }
-        returner += '</' + gradientType + 'Gradient>' +
-                    '<rect ' + rectangleDimension + ' fill="url(#gradient)" /></svg>';
-
-        if (useBase64) {
-            try {
-                returner = require('./encoder').encodeBase64(returner); // TODO browser implementation
-            } catch(e) {
-                useBase64 = false;
-            }
-        }
-
-        returner = "'data:image/svg+xml" + (useBase64 ? ";base64" : "") + "," + returner + "'";
-        return new(tree.URL)(new(tree.Anonymous)(returner));
-    }
-};
-
-// these static methods are used as a fallback when the optional 'mime' dependency is missing
-tree._mime = {
-    // this map is intentionally incomplete
-    // if you want more, install 'mime' dep
-    _types: {
-        '.htm' : 'text/html',
-        '.html': 'text/html',
-        '.gif' : 'image/gif',
-        '.jpg' : 'image/jpeg',
-        '.jpeg': 'image/jpeg',
-        '.png' : 'image/png'
-    },
-    lookup: function (filepath) {
-        var ext = require('path').extname(filepath),
-            type = tree._mime._types[ext];
-        if (type === undefined) {
-            throw new Error('Optional dependency "mime" is required for ' + ext);
-        }
-        return type;
-    },
-    charsets: {
-        lookup: function (type) {
-            // assumes all text types are UTF-8
-            return type && (/^text\//).test(type) ? 'UTF-8' : '';
-        }
-    }
-};
-
-// Math
-
-var mathFunctions = {
- // name,  unit
-    ceil:  null,
-    floor: null,
-    sqrt:  null,
-    abs:   null,
-    tan:   "",
-    sin:   "",
-    cos:   "",
-    atan:  "rad",
-    asin:  "rad",
-    acos:  "rad"
-};
-
-function _math(fn, unit, n) {
-    if (!(n instanceof tree.Dimension)) {
-        throw { type: "Argument", message: "argument must be a number" };
-    }
-    if (unit == null) {
-        unit = n.unit;
-    } else {
-        n = n.unify();
-    }
-    return new(tree.Dimension)(fn(parseFloat(n.value)), unit);
-}
-
-// ~ End of Math
-
-// Color Blending
-// ref: http://www.w3.org/TR/compositing-1
-
-function colorBlend(mode, color1, color2) {
-    var ab = color1.alpha, cb, // backdrop
-        as = color2.alpha, cs, // source
-        ar, cr, r = [];        // result
-
-    ar = as + ab * (1 - as);
-    for (var i = 0; i < 3; i++) {
-        cb = color1.rgb[i] / 255;
-        cs = color2.rgb[i] / 255;
-        cr = mode(cb, cs);
-        if (ar) {
-            cr = (as * cs + ab * (cb
-                - as * (cb + cs - cr))) / ar;
-        }
-        r[i] = cr * 255;
-    }
-
-    return new(tree.Color)(r, ar);
-}
-
-var colorBlendMode = {
-    multiply: function(cb, cs) {
-        return cb * cs;
-    },
-    screen: function(cb, cs) {
-        return cb + cs - cb * cs;
-    },
-    overlay: function(cb, cs) {
-        cb *= 2;
-        return (cb <= 1)
-            ? colorBlendMode.multiply(cb, cs)
-            : colorBlendMode.screen(cb - 1, cs);
-    },
-    softlight: function(cb, cs) {
-        var d = 1, e = cb;
-        if (cs > 0.5) {
-            e = 1;
-            d = (cb > 0.25) ? Math.sqrt(cb)
-                : ((16 * cb - 12) * cb + 4) * cb;
-        }
-        return cb - (1 - 2 * cs) * e * (d - cb);
-    },
-    hardlight: function(cb, cs) {
-        return colorBlendMode.overlay(cs, cb);
-    },
-    difference: function(cb, cs) {
-        return Math.abs(cb - cs);
-    },
-    exclusion: function(cb, cs) {
-        return cb + cs - 2 * cb * cs;
-    },
-
-    // non-w3c functions:
-    average: function(cb, cs) {
-        return (cb + cs) / 2;
-    },
-    negation: function(cb, cs) {
-        return 1 - Math.abs(cb + cs - 1);
-    }
-};
-
-// ~ End of Color Blending
-
-tree.defaultFunc = {
-    eval: function () {
-        var v = this.value_, e = this.error_;
-        if (e) {
-            throw e;
-        }
-        if (v != null) {
-            return v ? tree.True : tree.False;
-        }
-    },
-    value: function (v) {
-        this.value_ = v;
-    },
-    error: function (e) {
-        this.error_ = e;
-    },
-    reset: function () {
-        this.value_ = this.error_ = null;
-    }
-};
-
-function initFunctions() {
-    var f, tf = tree.functions;
-
-    // math
-    for (f in mathFunctions) {
-        if (mathFunctions.hasOwnProperty(f)) {
-            tf[f] = _math.bind(null, Math[f], mathFunctions[f]);
-        }
-    }
-
-    // color blending
-    for (f in colorBlendMode) {
-        if (colorBlendMode.hasOwnProperty(f)) {
-            tf[f] = colorBlend.bind(null, colorBlendMode[f]);
-        }
-    }
-
-    // default
-    f = tree.defaultFunc;
-    tf["default"] = f.eval.bind(f);
-
-} initFunctions();
-
-function hsla(color) {
-    return tree.functions.hsla(color.h, color.s, color.l, color.a);
-}
-
-function scaled(n, size) {
-    if (n instanceof tree.Dimension && n.unit.is('%')) {
-        return parseFloat(n.value * size / 100);
-    } else {
-        return number(n);
-    }
-}
-
-function number(n) {
-    if (n instanceof tree.Dimension) {
-        return parseFloat(n.unit.is('%') ? n.value / 100 : n.value);
-    } else if (typeof(n) === 'number') {
-        return n;
-    } else {
-        throw {
-            error: "RuntimeError",
-            message: "color functions take numbers as parameters"
-        };
-    }
-}
-
-function clamp(val) {
-    return Math.min(1, Math.max(0, val));
-}
-
-tree.fround = function(env, value) {
-    var p;
-    if (env && (env.numPrecision != null)) {
-        p = Math.pow(10, env.numPrecision);
-        return Math.round(value * p) / p;
-    } else {
-        return value;
-    }
-};
-
-tree.functionCall = function(env, currentFileInfo) {
-    this.env = env;
-    this.currentFileInfo = currentFileInfo;
-};
-
-tree.functionCall.prototype = tree.functions;
-
-})(require('./tree'));
-
-(function (tree) {
-    tree.colors = {
-        'aliceblue':'#f0f8ff',
-        'antiquewhite':'#faebd7',
-        'aqua':'#00ffff',
-        'aquamarine':'#7fffd4',
-        'azure':'#f0ffff',
-        'beige':'#f5f5dc',
-        'bisque':'#ffe4c4',
-        'black':'#000000',
-        'blanchedalmond':'#ffebcd',
-        'blue':'#0000ff',
-        'blueviolet':'#8a2be2',
-        'brown':'#a52a2a',
-        'burlywood':'#deb887',
-        'cadetblue':'#5f9ea0',
-        'chartreuse':'#7fff00',
-        'chocolate':'#d2691e',
-        'coral':'#ff7f50',
-        'cornflowerblue':'#6495ed',
-        'cornsilk':'#fff8dc',
-        'crimson':'#dc143c',
-        'cyan':'#00ffff',
-        'darkblue':'#00008b',
-        'darkcyan':'#008b8b',
-        'darkgoldenrod':'#b8860b',
-        'darkgray':'#a9a9a9',
-        'darkgrey':'#a9a9a9',
-        'darkgreen':'#006400',
-        'darkkhaki':'#bdb76b',
-        'darkmagenta':'#8b008b',
-        'darkolivegreen':'#556b2f',
-        'darkorange':'#ff8c00',
-        'darkorchid':'#9932cc',
-        'darkred':'#8b0000',
-        'darksalmon':'#e9967a',
-        'darkseagreen':'#8fbc8f',
-        'darkslateblue':'#483d8b',
-        'darkslategray':'#2f4f4f',
-        'darkslategrey':'#2f4f4f',
-        'darkturquoise':'#00ced1',
-        'darkviolet':'#9400d3',
-        'deeppink':'#ff1493',
-        'deepskyblue':'#00bfff',
-        'dimgray':'#696969',
-        'dimgrey':'#696969',
-        'dodgerblue':'#1e90ff',
-        'firebrick':'#b22222',
-        'floralwhite':'#fffaf0',
-        'forestgreen':'#228b22',
-        'fuchsia':'#ff00ff',
-        'gainsboro':'#dcdcdc',
-        'ghostwhite':'#f8f8ff',
-        'gold':'#ffd700',
-        'goldenrod':'#daa520',
-        'gray':'#808080',
-        'grey':'#808080',
-        'green':'#008000',
-        'greenyellow':'#adff2f',
-        'honeydew':'#f0fff0',
-        'hotpink':'#ff69b4',
-        'indianred':'#cd5c5c',
-        'indigo':'#4b0082',
-        'ivory':'#fffff0',
-        'khaki':'#f0e68c',
-        'lavender':'#e6e6fa',
-        'lavenderblush':'#fff0f5',
-        'lawngreen':'#7cfc00',
-        'lemonchiffon':'#fffacd',
-        'lightblue':'#add8e6',
-        'lightcoral':'#f08080',
-        'lightcyan':'#e0ffff',
-        'lightgoldenrodyellow':'#fafad2',
-        'lightgray':'#d3d3d3',
-        'lightgrey':'#d3d3d3',
-        'lightgreen':'#90ee90',
-        'lightpink':'#ffb6c1',
-        'lightsalmon':'#ffa07a',
-        'lightseagreen':'#20b2aa',
-        'lightskyblue':'#87cefa',
-        'lightslategray':'#778899',
-        'lightslategrey':'#778899',
-        'lightsteelblue':'#b0c4de',
-        'lightyellow':'#ffffe0',
-        'lime':'#00ff00',
-        'limegreen':'#32cd32',
-        'linen':'#faf0e6',
-        'magenta':'#ff00ff',
-        'maroon':'#800000',
-        'mediumaquamarine':'#66cdaa',
-        'mediumblue':'#0000cd',
-        'mediumorchid':'#ba55d3',
-        'mediumpurple':'#9370d8',
-        'mediumseagreen':'#3cb371',
-        'mediumslateblue':'#7b68ee',
-        'mediumspringgreen':'#00fa9a',
-        'mediumturquoise':'#48d1cc',
-        'mediumvioletred':'#c71585',
-        'midnightblue':'#191970',
-        'mintcream':'#f5fffa',
-        'mistyrose':'#ffe4e1',
-        'moccasin':'#ffe4b5',
-        'navajowhite':'#ffdead',
-        'navy':'#000080',
-        'oldlace':'#fdf5e6',
-        'olive':'#808000',
-        'olivedrab':'#6b8e23',
-        'orange':'#ffa500',
-        'orangered':'#ff4500',
-        'orchid':'#da70d6',
-        'palegoldenrod':'#eee8aa',
-        'palegreen':'#98fb98',
-        'paleturquoise':'#afeeee',
-        'palevioletred':'#d87093',
-        'papayawhip':'#ffefd5',
-        'peachpuff':'#ffdab9',
-        'peru':'#cd853f',
-        'pink':'#ffc0cb',
-        'plum':'#dda0dd',
-        'powderblue':'#b0e0e6',
-        'purple':'#800080',
-        'red':'#ff0000',
-        'rosybrown':'#bc8f8f',
-        'royalblue':'#4169e1',
-        'saddlebrown':'#8b4513',
-        'salmon':'#fa8072',
-        'sandybrown':'#f4a460',
-        'seagreen':'#2e8b57',
-        'seashell':'#fff5ee',
-        'sienna':'#a0522d',
-        'silver':'#c0c0c0',
-        'skyblue':'#87ceeb',
-        'slateblue':'#6a5acd',
-        'slategray':'#708090',
-        'slategrey':'#708090',
-        'snow':'#fffafa',
-        'springgreen':'#00ff7f',
-        'steelblue':'#4682b4',
-        'tan':'#d2b48c',
-        'teal':'#008080',
-        'thistle':'#d8bfd8',
-        'tomato':'#ff6347',
-        'turquoise':'#40e0d0',
-        'violet':'#ee82ee',
-        'wheat':'#f5deb3',
-        'white':'#ffffff',
-        'whitesmoke':'#f5f5f5',
-        'yellow':'#ffff00',
-        'yellowgreen':'#9acd32'
-    };
-})(require('./tree'));
-
-(function (tree) {
-
-tree.debugInfo = function(env, ctx, lineSeperator) {
-    var result="";
-    if (env.dumpLineNumbers && !env.compress) {
-        switch(env.dumpLineNumbers) {
-            case 'comments':
-                result = tree.debugInfo.asComment(ctx);
-                break;
-            case 'mediaquery':
-                result = tree.debugInfo.asMediaQuery(ctx);
-                break;
-            case 'all':
-                result = tree.debugInfo.asComment(ctx) + (lineSeperator || "") + tree.debugInfo.asMediaQuery(ctx);
-                break;
-        }
-    }
-    return result;
-};
-
-tree.debugInfo.asComment = function(ctx) {
-    return '/* line ' + ctx.debugInfo.lineNumber + ', ' + ctx.debugInfo.fileName + ' */\n';
-};
-
-tree.debugInfo.asMediaQuery = function(ctx) {
-    return '@media -sass-debug-info{filename{font-family:' +
-        ('file://' + ctx.debugInfo.fileName).replace(/([.:\/\\])/g, function (a) {
-            if (a == '\\') {
-                a = '\/';
-            }
-            return '\\' + a;
-        }) +
-        '}line{font-family:\\00003' + ctx.debugInfo.lineNumber + '}}\n';
-};
-
-tree.find = function (obj, fun) {
-    for (var i = 0, r; i < obj.length; i++) {
-        r = fun.call(obj, obj[i]);
-        if (r) { return r; }
-    }
-    return null;
-};
-
-tree.jsify = function (obj) {
-    if (Array.isArray(obj.value) && (obj.value.length > 1)) {
-        return '[' + obj.value.map(function (v) { return v.toCSS(false); }).join(', ') + ']';
-    } else {
-        return obj.toCSS(false);
-    }
-};
-
-tree.toCSS = function (env) {
-    var strs = [];
-    this.genCSS(env, {
-        add: function(chunk, fileInfo, index) {
-            strs.push(chunk);
-        },
-        isEmpty: function () {
-            return strs.length === 0;
-        }
-    });
-    return strs.join('');
-};
-
-tree.outputRuleset = function (env, output, rules) {
-    var ruleCnt = rules.length, i;
-    env.tabLevel = (env.tabLevel | 0) + 1;
-
-    // Compressed
-    if (env.compress) {
-        output.add('{');
-        for (i = 0; i < ruleCnt; i++) {
-            rules[i].genCSS(env, output);
-        }
-        output.add('}');
-        env.tabLevel--;
-        return;
-    }
-
-    // Non-compressed
-    var tabSetStr = '\n' + Array(env.tabLevel).join("  "), tabRuleStr = tabSetStr + "  ";
-    if (!ruleCnt) {
-        output.add(" {" + tabSetStr + '}');
-    } else {
-        output.add(" {" + tabRuleStr);
-        rules[0].genCSS(env, output);
-        for (i = 1; i < ruleCnt; i++) {
-            output.add(tabRuleStr);
-            rules[i].genCSS(env, output);
-        }
-        output.add(tabSetStr + '}');
-    }
-
-    env.tabLevel--;
-};
-
-})(require('./tree'));
-
-(function (tree) {
-
-tree.Alpha = function (val) {
-    this.value = val;
-};
-tree.Alpha.prototype = {
-    type: "Alpha",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) { return new tree.Alpha(this.value.eval(env)); }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add("alpha(opacity=");
-
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-
-        output.add(")");
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Anonymous = function (string, index, currentFileInfo, mapLines) {
-    this.value = string.value || string;
-    this.index = index;
-    this.mapLines = mapLines;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Anonymous.prototype = {
-    type: "Anonymous",
-    eval: function () {
-        return new tree.Anonymous(this.value, this.index, this.currentFileInfo, this.mapLines);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left = this.toCSS(),
-            right = x.toCSS();
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    },
-    genCSS: function (env, output) {
-        output.add(this.value, this.currentFileInfo, this.index, this.mapLines);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Assignment = function (key, val) {
-    this.key = key;
-    this.value = val;
-};
-tree.Assignment.prototype = {
-    type: "Assignment",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) {
-            return new(tree.Assignment)(this.key, this.value.eval(env));
-        }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add(this.key + '=');
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A function call node.
-//
-tree.Call = function (name, args, index, currentFileInfo) {
-    this.name = name;
-    this.args = args;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Call.prototype = {
-    type: "Call",
-    accept: function (visitor) {
-        if (this.args) {
-            this.args = visitor.visitArray(this.args);
-        }
-    },
-    //
-    // When evaluating a function call,
-    // we either find the function in `tree.functions` [1],
-    // in which case we call it, passing the  evaluated arguments,
-    // if this returns null or we cannot find the function, we
-    // simply print it out as it appeared originally [2].
-    //
-    // The *functions.js* file contains the built-in functions.
-    //
-    // The reason why we evaluate the arguments, is in the case where
-    // we try to pass a variable to a function, like: `saturate(@color)`.
-    // The function should receive the value, not the variable.
-    //
-    eval: function (env) {
-        var args = this.args.map(function (a) { return a.eval(env); }),
-            nameLC = this.name.toLowerCase(),
-            result, func;
-
-        if (nameLC in tree.functions) { // 1.
-            try {
-                func = new tree.functionCall(env, this.currentFileInfo);
-                result = func[nameLC].apply(func, args);
-                if (result != null) {
-                    return result;
-                }
-            } catch (e) {
-                throw { type: e.type || "Runtime",
-                        message: "error evaluating function `" + this.name + "`" +
-                                 (e.message ? ': ' + e.message : ''),
-                        index: this.index, filename: this.currentFileInfo.filename };
-            }
-        }
-
-        return new tree.Call(this.name, args, this.index, this.currentFileInfo);
-    },
-
-    genCSS: function (env, output) {
-        output.add(this.name + "(", this.currentFileInfo, this.index);
-
-        for(var i = 0; i < this.args.length; i++) {
-            this.args[i].genCSS(env, output);
-            if (i + 1 < this.args.length) {
-                output.add(", ");
-            }
-        }
-
-        output.add(")");
-    },
-
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// RGB Colors - #ff0014, #eee
-//
-tree.Color = function (rgb, a) {
-    //
-    // The end goal here, is to parse the arguments
-    // into an integer triplet, such as `128, 255, 0`
-    //
-    // This facilitates operations and conversions.
-    //
-    if (Array.isArray(rgb)) {
-        this.rgb = rgb;
-    } else if (rgb.length == 6) {
-        this.rgb = rgb.match(/.{2}/g).map(function (c) {
-            return parseInt(c, 16);
-        });
-    } else {
-        this.rgb = rgb.split('').map(function (c) {
-            return parseInt(c + c, 16);
-        });
-    }
-    this.alpha = typeof(a) === 'number' ? a : 1;
-};
-
-var transparentKeyword = "transparent";
-
-tree.Color.prototype = {
-    type: "Color",
-    eval: function () { return this; },
-    luma: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255;
-
-        r = (r <= 0.03928) ? r / 12.92 : Math.pow(((r + 0.055) / 1.055), 2.4);
-        g = (g <= 0.03928) ? g / 12.92 : Math.pow(((g + 0.055) / 1.055), 2.4);
-        b = (b <= 0.03928) ? b / 12.92 : Math.pow(((b + 0.055) / 1.055), 2.4);
-
-        return 0.2126 * r + 0.7152 * g + 0.0722 * b;
-    },
-
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env, doNotCompress) {
-        var compress = env && env.compress && !doNotCompress,
-            alpha = tree.fround(env, this.alpha);
-
-        // If we have some transparency, the only way to represent it
-        // is via `rgba`. Otherwise, we use the hex representation,
-        // which has better compatibility with older browsers.
-        // Values are capped between `0` and `255`, rounded and zero-padded.
-        if (alpha < 1) {
-            if (alpha === 0 && this.isTransparentKeyword) {
-                return transparentKeyword;
-            }
-            return "rgba(" + this.rgb.map(function (c) {
-                return clamp(Math.round(c), 255);
-            }).concat(clamp(alpha, 1))
-                .join(',' + (compress ? '' : ' ')) + ")";
-        } else {
-            var color = this.toRGB();
-
-            if (compress) {
-                var splitcolor = color.split('');
-
-                // Convert color to short format
-                if (splitcolor[1] === splitcolor[2] && splitcolor[3] === splitcolor[4] && splitcolor[5] === splitcolor[6]) {
-                    color = '#' + splitcolor[1] + splitcolor[3] + splitcolor[5];
-                }
-            }
-
-            return color;
-        }
-    },
-
-    //
-    // Operations have to be done per-channel, if not,
-    // channels will spill onto each other. Once we have
-    // our result, in the form of an integer triplet,
-    // we create a new Color node to hold the result.
-    //
-    operate: function (env, op, other) {
-        var rgb = [];
-        var alpha = this.alpha * (1 - other.alpha) + other.alpha;
-        for (var c = 0; c < 3; c++) {
-            rgb[c] = tree.operate(env, op, this.rgb[c], other.rgb[c]);
-        }
-        return new(tree.Color)(rgb, alpha);
-    },
-
-    toRGB: function () {
-        return toHex(this.rgb);
-    },
-
-    toHSL: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, l = (max + min) / 2, d = max - min;
-
-        if (max === min) {
-            h = s = 0;
-        } else {
-            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
-
-            switch (max) {
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2;               break;
-                case b: h = (r - g) / d + 4;               break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, l: l, a: a };
-    },
-    //Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
-    toHSV: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, v = max;
-
-        var d = max - min;
-        if (max === 0) {
-            s = 0;
-        } else {
-            s = d / max;
-        }
-
-        if (max === min) {
-            h = 0;
-        } else {
-            switch(max){
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2; break;
-                case b: h = (r - g) / d + 4; break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, v: v, a: a };
-    },
-    toARGB: function () {
-        return toHex([this.alpha * 255].concat(this.rgb));
-    },
-    compare: function (x) {
-        if (!x.rgb) {
-            return -1;
-        }
-
-        return (x.rgb[0] === this.rgb[0] &&
-            x.rgb[1] === this.rgb[1] &&
-            x.rgb[2] === this.rgb[2] &&
-            x.alpha === this.alpha) ? 0 : -1;
-    }
-};
-
-tree.Color.fromKeyword = function(keyword) {
-    keyword = keyword.toLowerCase();
-
-    if (tree.colors.hasOwnProperty(keyword)) {
-        // detect named color
-        return new(tree.Color)(tree.colors[keyword].slice(1));
-    }
-    if (keyword === transparentKeyword) {
-        var transparent = new(tree.Color)([0, 0, 0], 0);
-        transparent.isTransparentKeyword = true;
-        return transparent;
-    }
-};
-
-function toHex(v) {
-    return '#' + v.map(function (c) {
-        c = clamp(Math.round(c), 255);
-        return (c < 16 ? '0' : '') + c.toString(16);
-    }).join('');
-}
-
-function clamp(v, max) {
-    return Math.min(Math.max(v, 0), max);
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Comment = function (value, silent, index, currentFileInfo) {
-    this.value = value;
-    this.silent = !!silent;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Comment.prototype = {
-    type: "Comment",
-    genCSS: function (env, output) {
-        if (this.debugInfo) {
-            output.add(tree.debugInfo(env, this), this.currentFileInfo, this.index);
-        }
-        output.add(this.value.trim()); //TODO shouldn't need to trim, we shouldn't grab the \n
-    },
-    toCSS: tree.toCSS,
-    isSilent: function(env) {
-        var isReference = (this.currentFileInfo && this.currentFileInfo.reference && !this.isReferenced),
-            isCompressed = env.compress && !this.value.match(/^\/\*!/);
-        return this.silent || isReference || isCompressed;
-    },
-    eval: function () { return this; },
-    markReferenced: function () {
-        this.isReferenced = true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Condition = function (op, l, r, i, negate) {
-    this.op = op.trim();
-    this.lvalue = l;
-    this.rvalue = r;
-    this.index = i;
-    this.negate = negate;
-};
-tree.Condition.prototype = {
-    type: "Condition",
-    accept: function (visitor) {
-        this.lvalue = visitor.visit(this.lvalue);
-        this.rvalue = visitor.visit(this.rvalue);
-    },
-    eval: function (env) {
-        var a = this.lvalue.eval(env),
-            b = this.rvalue.eval(env);
-
-        var i = this.index, result;
-
-        result = (function (op) {
-            switch (op) {
-                case 'and':
-                    return a && b;
-                case 'or':
-                    return a || b;
-                default:
-                    if (a.compare) {
-                        result = a.compare(b);
-                    } else if (b.compare) {
-                        result = b.compare(a);
-                    } else {
-                        throw { type: "Type",
-                                message: "Unable to perform comparison",
-                                index: i };
-                    }
-                    switch (result) {
-                        case -1: return op === '<' || op === '=<' || op === '<=';
-                        case  0: return op === '=' || op === '>=' || op === '=<' || op === '<=';
-                        case  1: return op === '>' || op === '>=';
-                    }
-            }
-        })(this.op);
-        return this.negate ? !result : result;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.DetachedRuleset = function (ruleset, frames) {
-    this.ruleset = ruleset;
-    this.frames = frames;
-};
-tree.DetachedRuleset.prototype = {
-    type: "DetachedRuleset",
-    accept: function (visitor) {
-        this.ruleset = visitor.visit(this.ruleset);
-    },
-    eval: function (env) {
-        var frames = this.frames || env.frames.slice(0);
-        return new tree.DetachedRuleset(this.ruleset, frames);
-    },
-    callEval: function (env) {
-        return this.ruleset.eval(this.frames ? new(tree.evalEnv)(env, this.frames.concat(env.frames)) : env);
-    }
-};
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A number with a unit
-//
-tree.Dimension = function (value, unit) {
-    this.value = parseFloat(value);
-    this.unit = (unit && unit instanceof tree.Unit) ? unit :
-      new(tree.Unit)(unit ? [unit] : undefined);
-};
-
-tree.Dimension.prototype = {
-    type: "Dimension",
-    accept: function (visitor) {
-        this.unit = visitor.visit(this.unit);
-    },
-    eval: function (env) {
-        return this;
-    },
-    toColor: function () {
-        return new(tree.Color)([this.value, this.value, this.value]);
-    },
-    genCSS: function (env, output) {
-        if ((env && env.strictUnits) && !this.unit.isSingular()) {
-            throw new Error("Multiple units in dimension. Correct the units or use the unit function. Bad unit: "+this.unit.toString());
-        }
-
-        var value = tree.fround(env, this.value),
-            strValue = String(value);
-
-        if (value !== 0 && value < 0.000001 && value > -0.000001) {
-            // would be output 1e-6 etc.
-            strValue = value.toFixed(20).replace(/0+$/, "");
-        }
-
-        if (env && env.compress) {
-            // Zero values doesn't need a unit
-            if (value === 0 && this.unit.isLength()) {
-                output.add(strValue);
-                return;
-            }
-
-            // Float values doesn't need a leading zero
-            if (value > 0 && value < 1) {
-                strValue = (strValue).substr(1);
-            }
-        }
-
-        output.add(strValue);
-        this.unit.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-
-    // In an operation between two Dimensions,
-    // we default to the first Dimension's unit,
-    // so `1px + 2` will yield `3px`.
-    operate: function (env, op, other) {
-        /*jshint noempty:false */
-        var value = tree.operate(env, op, this.value, other.value),
-            unit = this.unit.clone();
-
-        if (op === '+' || op === '-') {
-            if (unit.numerator.length === 0 && unit.denominator.length === 0) {
-                unit.numerator = other.unit.numerator.slice(0);
-                unit.denominator = other.unit.denominator.slice(0);
-            } else if (other.unit.numerator.length === 0 && unit.denominator.length === 0) {
-                // do nothing
-            } else {
-                other = other.convertTo(this.unit.usedUnits());
-
-                if(env.strictUnits && other.unit.toString() !== unit.toString()) {
-                  throw new Error("Incompatible units. Change the units or use the unit function. Bad units: '" + unit.toString() +
-                    "' and '" + other.unit.toString() + "'.");
-                }
-
-                value = tree.operate(env, op, this.value, other.value);
-            }
-        } else if (op === '*') {
-            unit.numerator = unit.numerator.concat(other.unit.numerator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.denominator).sort();
-            unit.cancel();
-        } else if (op === '/') {
-            unit.numerator = unit.numerator.concat(other.unit.denominator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.numerator).sort();
-            unit.cancel();
-        }
-        return new(tree.Dimension)(value, unit);
-    },
-
-    compare: function (other) {
-        if (other instanceof tree.Dimension) {
-            var a, b,
-                aValue, bValue;
-
-            if (this.unit.isEmpty() || other.unit.isEmpty()) {
-                a = this;
-                b = other;
-            } else {
-                a = this.unify();
-                b = other.unify();
-                if (a.unit.compare(b.unit) !== 0) {
-                    return -1;
-                }
-            }
-            aValue = a.value;
-            bValue = b.value;
-
-            if (bValue > aValue) {
-                return -1;
-            } else if (bValue < aValue) {
-                return 1;
-            } else {
-                return 0;
-            }
-        } else {
-            return -1;
-        }
-    },
-
-    unify: function () {
-        return this.convertTo({ length: 'px', duration: 's', angle: 'rad' });
-    },
-
-    convertTo: function (conversions) {
-        var value = this.value, unit = this.unit.clone(),
-            i, groupName, group, targetUnit, derivedConversions = {}, applyUnit;
-
-        if (typeof conversions === 'string') {
-            for(i in tree.UnitConversions) {
-                if (tree.UnitConversions[i].hasOwnProperty(conversions)) {
-                    derivedConversions = {};
-                    derivedConversions[i] = conversions;
-                }
-            }
-            conversions = derivedConversions;
-        }
-        applyUnit = function (atomicUnit, denominator) {
-          /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit)) {
-                if (denominator) {
-                    value = value / (group[atomicUnit] / group[targetUnit]);
-                } else {
-                    value = value * (group[atomicUnit] / group[targetUnit]);
-                }
-
-                return targetUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (groupName in conversions) {
-            if (conversions.hasOwnProperty(groupName)) {
-                targetUnit = conversions[groupName];
-                group = tree.UnitConversions[groupName];
-
-                unit.map(applyUnit);
-            }
-        }
-
-        unit.cancel();
-
-        return new(tree.Dimension)(value, unit);
-    }
-};
-
-// http://www.w3.org/TR/css3-values/#absolute-lengths
-tree.UnitConversions = {
-    length: {
-         'm': 1,
-        'cm': 0.01,
-        'mm': 0.001,
-        'in': 0.0254,
-        'px': 0.0254 / 96,
-        'pt': 0.0254 / 72,
-        'pc': 0.0254 / 72 * 12
-    },
-    duration: {
-        's': 1,
-        'ms': 0.001
-    },
-    angle: {
-        'rad': 1/(2*Math.PI),
-        'deg': 1/360,
-        'grad': 1/400,
-        'turn': 1
-    }
-};
-
-tree.Unit = function (numerator, denominator, backupUnit) {
-    this.numerator = numerator ? numerator.slice(0).sort() : [];
-    this.denominator = denominator ? denominator.slice(0).sort() : [];
-    this.backupUnit = backupUnit;
-};
-
-tree.Unit.prototype = {
-    type: "Unit",
-    clone: function () {
-        return new tree.Unit(this.numerator.slice(0), this.denominator.slice(0), this.backupUnit);
-    },
-    genCSS: function (env, output) {
-        if (this.numerator.length >= 1) {
-            output.add(this.numerator[0]);
-        } else
-        if (this.denominator.length >= 1) {
-            output.add(this.denominator[0]);
-        } else
-        if ((!env || !env.strictUnits) && this.backupUnit) {
-            output.add(this.backupUnit);
-        }
-    },
-    toCSS: tree.toCSS,
-
-    toString: function () {
-      var i, returnStr = this.numerator.join("*");
-      for (i = 0; i < this.denominator.length; i++) {
-          returnStr += "/" + this.denominator[i];
-      }
-      return returnStr;
-    },
-
-    compare: function (other) {
-        return this.is(other.toString()) ? 0 : -1;
-    },
-
-    is: function (unitString) {
-        return this.toString() === unitString;
-    },
-
-    isLength: function () {
-        return Boolean(this.toCSS().match(/px|em|%|in|cm|mm|pc|pt|ex/));
-    },
-
-    isEmpty: function () {
-        return this.numerator.length === 0 && this.denominator.length === 0;
-    },
-
-    isSingular: function() {
-        return this.numerator.length <= 1 && this.denominator.length === 0;
-    },
-
-    map: function(callback) {
-        var i;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            this.numerator[i] = callback(this.numerator[i], false);
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            this.denominator[i] = callback(this.denominator[i], true);
-        }
-    },
-
-    usedUnits: function() {
-        var group, result = {}, mapUnit;
-
-        mapUnit = function (atomicUnit) {
-        /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit) && !result[groupName]) {
-                result[groupName] = atomicUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (var groupName in tree.UnitConversions) {
-            if (tree.UnitConversions.hasOwnProperty(groupName)) {
-                group = tree.UnitConversions[groupName];
-
-                this.map(mapUnit);
-            }
-        }
-
-        return result;
-    },
-
-    cancel: function () {
-        var counter = {}, atomicUnit, i, backup;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            atomicUnit = this.numerator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) + 1;
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            atomicUnit = this.denominator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) - 1;
-        }
-
-        this.numerator = [];
-        this.denominator = [];
-
-        for (atomicUnit in counter) {
-            if (counter.hasOwnProperty(atomicUnit)) {
-                var count = counter[atomicUnit];
-
-                if (count > 0) {
-                    for (i = 0; i < count; i++) {
-                        this.numerator.push(atomicUnit);
-                    }
-                } else if (count < 0) {
-                    for (i = 0; i < -count; i++) {
-                        this.denominator.push(atomicUnit);
-                    }
-                }
-            }
-        }
-
-        if (this.numerator.length === 0 && this.denominator.length === 0 && backup) {
-            this.backupUnit = backup;
-        }
-
-        this.numerator.sort();
-        this.denominator.sort();
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Directive = function (name, value, rules, index, currentFileInfo, debugInfo) {
-    this.name  = name;
-    this.value = value;
-    if (rules) {
-        this.rules = rules;
-        this.rules.allowImports = true;
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.debugInfo = debugInfo;
-};
-
-tree.Directive.prototype = {
-    type: "Directive",
-    accept: function (visitor) {
-        var value = this.value, rules = this.rules;
-        if (rules) {
-            rules = visitor.visit(rules);
-        }
-        if (value) {
-            value = visitor.visit(value);
-        }
-    },
-    genCSS: function (env, output) {
-        var value = this.value, rules = this.rules;
-        output.add(this.name, this.currentFileInfo, this.index);
-        if (value) {
-            output.add(' ');
-            value.genCSS(env, output);
-        }
-        if (rules) {
-            tree.outputRuleset(env, output, [rules]);
-        } else {
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var value = this.value, rules = this.rules;
-        if (value) {
-            value = value.eval(env);
-        }
-        if (rules) {
-            rules = rules.eval(env);
-            rules.root = true;
-        }
-        return new(tree.Directive)(this.name, value, rules,
-            this.index, this.currentFileInfo, this.debugInfo);
-    },
-    variable: function (name) { if (this.rules) return tree.Ruleset.prototype.variable.call(this.rules, name); },
-    find: function () { if (this.rules) return tree.Ruleset.prototype.find.apply(this.rules, arguments); },
-    rulesets: function () { if (this.rules) return tree.Ruleset.prototype.rulesets.apply(this.rules); },
-    markReferenced: function () {
-        var i, rules;
-        this.isReferenced = true;
-        if (this.rules) {
-            rules = this.rules.rules;
-            for (i = 0; i < rules.length; i++) {
-                if (rules[i].markReferenced) {
-                    rules[i].markReferenced();
-                }
-            }
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Element = function (combinator, value, index, currentFileInfo) {
-    this.combinator = combinator instanceof tree.Combinator ?
-                      combinator : new(tree.Combinator)(combinator);
-
-    if (typeof(value) === 'string') {
-        this.value = value.trim();
-    } else if (value) {
-        this.value = value;
-    } else {
-        this.value = "";
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Element.prototype = {
-    type: "Element",
-    accept: function (visitor) {
-        var value = this.value;
-        this.combinator = visitor.visit(this.combinator);
-        if (typeof value === "object") {
-            this.value = visitor.visit(value);
-        }
-    },
-    eval: function (env) {
-        return new(tree.Element)(this.combinator,
-                                 this.value.eval ? this.value.eval(env) : this.value,
-                                 this.index,
-                                 this.currentFileInfo);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env), this.currentFileInfo, this.index);
-    },
-    toCSS: function (env) {
-        var value = (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        if (value === '' && this.combinator.value.charAt(0) === '&') {
-            return '';
-        } else {
-            return this.combinator.toCSS(env || {}) + value;
-        }
-    }
-};
-
-tree.Attribute = function (key, op, value) {
-    this.key = key;
-    this.op = op;
-    this.value = value;
-};
-tree.Attribute.prototype = {
-    type: "Attribute",
-    eval: function (env) {
-        return new(tree.Attribute)(this.key.eval ? this.key.eval(env) : this.key,
-            this.op, (this.value && this.value.eval) ? this.value.eval(env) : this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env) {
-        var value = this.key.toCSS ? this.key.toCSS(env) : this.key;
-
-        if (this.op) {
-            value += this.op;
-            value += (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        }
-
-        return '[' + value + ']';
-    }
-};
-
-tree.Combinator = function (value) {
-    if (value === ' ') {
-        this.value = ' ';
-    } else {
-        this.value = value ? value.trim() : "";
-    }
-};
-tree.Combinator.prototype = {
-    type: "Combinator",
-    _outputMap: {
-        ''  : '',
-        ' ' : ' ',
-        ':' : ' :',
-        '+' : ' + ',
-        '~' : ' ~ ',
-        '>' : ' > ',
-        '|' : '|',
-        '^' : ' ^ ',
-        '^^' : ' ^^ '
-    },
-    _outputMapCompressed: {
-        ''  : '',
-        ' ' : ' ',
-        ':' : ' :',
-        '+' : '+',
-        '~' : '~',
-        '>' : '>',
-        '|' : '|',
-        '^' : '^',
-        '^^' : '^^'
-    },
-    genCSS: function (env, output) {
-        output.add((env.compress ? this._outputMapCompressed : this._outputMap)[this.value]);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Expression = function (value) { this.value = value; };
-tree.Expression.prototype = {
-    type: "Expression",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        var returnValue,
-            inParenthesis = this.parens && !this.parensInOp,
-            doubleParen = false;
-        if (inParenthesis) {
-            env.inParenthesis();
-        }
-        if (this.value.length > 1) {
-            returnValue = new(tree.Expression)(this.value.map(function (e) {
-                return e.eval(env);
-            }));
-        } else if (this.value.length === 1) {
-            if (this.value[0].parens && !this.value[0].parensInOp) {
-                doubleParen = true;
-            }
-            returnValue = this.value[0].eval(env);
-        } else {
-            returnValue = this;
-        }
-        if (inParenthesis) {
-            env.outOfParenthesis();
-        }
-        if (this.parens && this.parensInOp && !(env.isMathOn()) && !doubleParen) {
-            returnValue = new(tree.Paren)(returnValue);
-        }
-        return returnValue;
-    },
-    genCSS: function (env, output) {
-        for(var i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i + 1 < this.value.length) {
-                output.add(" ");
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    throwAwayComments: function () {
-        this.value = this.value.filter(function(v) {
-            return !(v instanceof tree.Comment);
-        });
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Extend = function Extend(selector, option, index) {
-    this.selector = selector;
-    this.option = option;
-    this.index = index;
-    this.object_id = tree.Extend.next_id++;
-    this.parent_ids = [this.object_id];
-
-    switch(option) {
-        case "all":
-            this.allowBefore = true;
-            this.allowAfter = true;
-        break;
-        default:
-            this.allowBefore = false;
-            this.allowAfter = false;
-        break;
-    }
-};
-tree.Extend.next_id = 0;
-
-tree.Extend.prototype = {
-    type: "Extend",
-    accept: function (visitor) {
-        this.selector = visitor.visit(this.selector);
-    },
-    eval: function (env) {
-        return new(tree.Extend)(this.selector.eval(env), this.option, this.index);
-    },
-    clone: function (env) {
-        return new(tree.Extend)(this.selector, this.option, this.index);
-    },
-    findSelfSelectors: function (selectors) {
-        var selfElements = [],
-            i,
-            selectorElements;
-
-        for(i = 0; i < selectors.length; i++) {
-            selectorElements = selectors[i].elements;
-            // duplicate the logic in genCSS function inside the selector node.
-            // future TODO - move both logics into the selector joiner visitor
-            if (i > 0 && selectorElements.length && selectorElements[0].combinator.value === "") {
-                selectorElements[0].combinator.value = ' ';
-            }
-            selfElements = selfElements.concat(selectors[i].elements);
-        }
-
-        this.selfSelectors = [{ elements: selfElements }];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// CSS @import node
-//
-// The general strategy here is that we don't want to wait
-// for the parsing to be completed, before we start importing
-// the file. That's because in the context of a browser,
-// most of the time will be spent waiting for the server to respond.
-//
-// On creation, we push the import path to our import queue, though
-// `import,push`, we also pass it a callback, which it'll call once
-// the file has been fetched, and parsed.
-//
-tree.Import = function (path, features, options, index, currentFileInfo) {
-    this.options = options;
-    this.index = index;
-    this.path = path;
-    this.features = features;
-    this.currentFileInfo = currentFileInfo;
-
-    if (this.options.less !== undefined || this.options.inline) {
-        this.css = !this.options.less || this.options.inline;
-    } else {
-        var pathValue = this.getPath();
-        if (pathValue && /css([\?;].*)?$/.test(pathValue)) {
-            this.css = true;
-        }
-    }
-};
-
-//
-// The actual import node doesn't return anything, when converted to CSS.
-// The reason is that it's used at the evaluation stage, so that the rules
-// it imports can be treated like any other rules.
-//
-// In `eval`, we make sure all Import nodes get evaluated, recursively, so
-// we end up with a flat structure, which can easily be imported in the parent
-// ruleset.
-//
-tree.Import.prototype = {
-    type: "Import",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        this.path = visitor.visit(this.path);
-        if (!this.options.inline && this.root) {
-            this.root = visitor.visit(this.root);
-        }
-    },
-    genCSS: function (env, output) {
-        if (this.css) {
-            output.add("@import ", this.currentFileInfo, this.index);
-            this.path.genCSS(env, output);
-            if (this.features) {
-                output.add(" ");
-                this.features.genCSS(env, output);
-            }
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    getPath: function () {
-        if (this.path instanceof tree.Quoted) {
-            var path = this.path.value;
-            return (this.css !== undefined || /(\.[a-z]*$)|([\?;].*)$/.test(path)) ? path : path + '.less';
-        } else if (this.path instanceof tree.URL) {
-            return this.path.value.value;
-        }
-        return null;
-    },
-    evalForImport: function (env) {
-        return new(tree.Import)(this.path.eval(env), this.features, this.options, this.index, this.currentFileInfo);
-    },
-    evalPath: function (env) {
-        var path = this.path.eval(env);
-        var rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-
-        if (!(path instanceof tree.URL)) {
-            if (rootpath) {
-                var pathValue = path.value;
-                // Add the base path if the import is relative
-                if (pathValue && env.isPathRelative(pathValue)) {
-                    path.value = rootpath +pathValue;
-                }
-            }
-            path.value = env.normalizePath(path.value);
-        }
-
-        return path;
-    },
-    eval: function (env) {
-        var ruleset, features = this.features && this.features.eval(env);
-
-        if (this.skip) {
-            if (typeof this.skip === "function") {
-                this.skip = this.skip();
-            }
-            if (this.skip) {
-                return [];
-            }
-        }
-
-        if (this.options.inline) {
-            //todo needs to reference css file not import
-            var contents = new(tree.Anonymous)(this.root, 0, {filename: this.importedFilename}, true);
-            return this.features ? new(tree.Media)([contents], this.features.value) : [contents];
-        } else if (this.css) {
-            var newImport = new(tree.Import)(this.evalPath(env), features, this.options, this.index);
-            if (!newImport.css && this.error) {
-                throw this.error;
-            }
-            return newImport;
-        } else {
-            ruleset = new(tree.Ruleset)(null, this.root.rules.slice(0));
-
-            ruleset.evalImports(env);
-
-            return this.features ? new(tree.Media)(ruleset.rules, this.features.value) : ruleset.rules;
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.JavaScript = function (string, index, escaped) {
-    this.escaped = escaped;
-    this.expression = string;
-    this.index = index;
-};
-tree.JavaScript.prototype = {
-    type: "JavaScript",
-    eval: function (env) {
-        var result,
-            that = this,
-            context = {};
-
-        var expression = this.expression.replace(/@\{([\w-]+)\}/g, function (_, name) {
-            return tree.jsify(new(tree.Variable)('@' + name, that.index).eval(env));
-        });
-
-        try {
-            expression = new(Function)('return (' + expression + ')');
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: " + e.message + " from `" + expression + "`" ,
-                    index: this.index };
-        }
-
-        var variables = env.frames[0].variables();
-        for (var k in variables) {
-            if (variables.hasOwnProperty(k)) {
-                /*jshint loopfunc:true */
-                context[k.slice(1)] = {
-                    value: variables[k].value,
-                    toJS: function () {
-                        return this.value.eval(env).toCSS();
-                    }
-                };
-            }
-        }
-
-        try {
-            result = expression.call(context);
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: '" + e.name + ': ' + e.message.replace(/["]/g, "'") + "'" ,
-                    index: this.index };
-        }
-        if (typeof(result) === 'number') {
-            return new(tree.Dimension)(result);
-        } else if (typeof(result) === 'string') {
-            return new(tree.Quoted)('"' + result + '"', result, this.escaped, this.index);
-        } else if (Array.isArray(result)) {
-            return new(tree.Anonymous)(result.join(', '));
-        } else {
-            return new(tree.Anonymous)(result);
-        }
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Keyword = function (value) { this.value = value; };
-tree.Keyword.prototype = {
-    type: "Keyword",
-    eval: function () { return this; },
-    genCSS: function (env, output) {
-        if (this.value === '%') { throw { type: "Syntax", message: "Invalid % without number" }; }
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    compare: function (other) {
-        if (other instanceof tree.Keyword) {
-            return other.value === this.value ? 0 : 1;
-        } else {
-            return -1;
-        }
-    }
-};
-
-tree.True = new(tree.Keyword)('true');
-tree.False = new(tree.Keyword)('false');
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Media = function (value, features, index, currentFileInfo) {
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-
-    var selectors = this.emptySelectors();
-
-    this.features = new(tree.Value)(features);
-    this.rules = [new(tree.Ruleset)(selectors, value)];
-    this.rules[0].allowImports = true;
-};
-tree.Media.prototype = {
-    type: "Media",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        if (this.rules) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    genCSS: function (env, output) {
-        output.add('@media ', this.currentFileInfo, this.index);
-        this.features.genCSS(env, output);
-        tree.outputRuleset(env, output, this.rules);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (!env.mediaBlocks) {
-            env.mediaBlocks = [];
-            env.mediaPath = [];
-        }
-
-        var media = new(tree.Media)(null, [], this.index, this.currentFileInfo);
-        if(this.debugInfo) {
-            this.rules[0].debugInfo = this.debugInfo;
-            media.debugInfo = this.debugInfo;
-        }
-        var strictMathBypass = false;
-        if (!env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            media.features = this.features.eval(env);
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-
-        env.mediaPath.push(media);
-        env.mediaBlocks.push(media);
-
-        env.frames.unshift(this.rules[0]);
-        media.rules = [this.rules[0].eval(env)];
-        env.frames.shift();
-
-        env.mediaPath.pop();
-
-        return env.mediaPath.length === 0 ? media.evalTop(env) :
-                    media.evalNested(env);
-    },
-    variable: function (name) { return tree.Ruleset.prototype.variable.call(this.rules[0], name); },
-    find: function () { return tree.Ruleset.prototype.find.apply(this.rules[0], arguments); },
-    rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.rules[0]); },
-    emptySelectors: function() {
-        var el = new(tree.Element)('', '&', this.index, this.currentFileInfo),
-            sels = [new(tree.Selector)([el], null, null, this.index, this.currentFileInfo)];
-        sels[0].mediaEmpty = true;
-        return sels;
-    },
-    markReferenced: function () {
-        var i, rules = this.rules[0].rules;
-        this.rules[0].markReferenced();
-        this.isReferenced = true;
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i].markReferenced) {
-                rules[i].markReferenced();
-            }
-        }
-    },
-
-    evalTop: function (env) {
-        var result = this;
-
-        // Render all dependent Media blocks.
-        if (env.mediaBlocks.length > 1) {
-            var selectors = this.emptySelectors();
-            result = new(tree.Ruleset)(selectors, env.mediaBlocks);
-            result.multiMedia = true;
-        }
-
-        delete env.mediaBlocks;
-        delete env.mediaPath;
-
-        return result;
-    },
-    evalNested: function (env) {
-        var i, value,
-            path = env.mediaPath.concat([this]);
-
-        // Extract the media-query conditions separated with `,` (OR).
-        for (i = 0; i < path.length; i++) {
-            value = path[i].features instanceof tree.Value ?
-                        path[i].features.value : path[i].features;
-            path[i] = Array.isArray(value) ? value : [value];
-        }
-
-        // Trace all permutations to generate the resulting media-query.
-        //
-        // (a, b and c) with nested (d, e) ->
-        //    a and d
-        //    a and e
-        //    b and c and d
-        //    b and c and e
-        this.features = new(tree.Value)(this.permute(path).map(function (path) {
-            path = path.map(function (fragment) {
-                return fragment.toCSS ? fragment : new(tree.Anonymous)(fragment);
-            });
-
-            for(i = path.length - 1; i > 0; i--) {
-                path.splice(i, 0, new(tree.Anonymous)("and"));
-            }
-
-            return new(tree.Expression)(path);
-        }));
-
-        // Fake a tree-node that doesn't output anything.
-        return new(tree.Ruleset)([], []);
-    },
-    permute: function (arr) {
-      if (arr.length === 0) {
-          return [];
-      } else if (arr.length === 1) {
-          return arr[0];
-      } else {
-          var result = [];
-          var rest = this.permute(arr.slice(1));
-          for (var i = 0; i < rest.length; i++) {
-              for (var j = 0; j < arr[0].length; j++) {
-                  result.push([arr[0][j]].concat(rest[i]));
-              }
-          }
-          return result;
-      }
-    },
-    bubbleSelectors: function (selectors) {
-      if (!selectors)
-        return;
-      this.rules = [new(tree.Ruleset)(selectors.slice(0), [this.rules[0]])];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.mixin = {};
-tree.mixin.Call = function (elements, args, index, currentFileInfo, important) {
-    this.selector = new(tree.Selector)(elements);
-    this.arguments = (args && args.length) ? args : null;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.important = important;
-};
-tree.mixin.Call.prototype = {
-    type: "MixinCall",
-    accept: function (visitor) {
-        if (this.selector) {
-            this.selector = visitor.visit(this.selector);
-        }
-        if (this.arguments) {
-            this.arguments = visitor.visitArray(this.arguments);
-        }
-    },
-    eval: function (env) {
-        var mixins, mixin, args, rules = [], match = false, i, m, f, isRecursive, isOneFound, rule,
-            candidates = [], candidate, conditionResult = [], defaultFunc = tree.defaultFunc,
-            defaultResult, defNone = 0, defTrue = 1, defFalse = 2, count;
-
-        args = this.arguments && this.arguments.map(function (a) {
-            return { name: a.name, value: a.value.eval(env) };
-        });
-
-        for (i = 0; i < env.frames.length; i++) {
-            if ((mixins = env.frames[i].find(this.selector)).length > 0) {
-                isOneFound = true;
-
-                // To make `default()` function independent of definition order we have two "subpasses" here.
-                // At first we evaluate each guard *twice* (with `default() == true` and `default() == false`),
-                // and build candidate list with corresponding flags. Then, when we know all possible matches,
-                // we make a final decision.
-
-                for (m = 0; m < mixins.length; m++) {
-                    mixin = mixins[m];
-                    isRecursive = false;
-                    for(f = 0; f < env.frames.length; f++) {
-                        if ((!(mixin instanceof tree.mixin.Definition)) && mixin === (env.frames[f].originalRuleset || env.frames[f])) {
-                            isRecursive = true;
-                            break;
-                        }
-                    }
-                    if (isRecursive) {
-                        continue;
-                    }
-
-                    if (mixin.matchArgs(args, env)) {
-                        candidate = {mixin: mixin, group: defNone};
-
-                        if (mixin.matchCondition) {
-                            for (f = 0; f < 2; f++) {
-                                defaultFunc.value(f);
-                                conditionResult[f] = mixin.matchCondition(args, env);
-                            }
-                            if (conditionResult[0] || conditionResult[1]) {
-                                if (conditionResult[0] != conditionResult[1]) {
-                                    candidate.group = conditionResult[1] ?
-                                        defTrue : defFalse;
-                                }
-
-                                candidates.push(candidate);
-                            }
-                        }
-                        else {
-                            candidates.push(candidate);
-                        }
-
-                        match = true;
-                    }
-                }
-
-                defaultFunc.reset();
-
-                count = [0, 0, 0];
-                for (m = 0; m < candidates.length; m++) {
-                    count[candidates[m].group]++;
-                }
-
-                if (count[defNone] > 0) {
-                    defaultResult = defFalse;
-                } else {
-                    defaultResult = defTrue;
-                    if ((count[defTrue] + count[defFalse]) > 1) {
-                        throw { type: 'Runtime',
-                            message: 'Ambiguous use of `default()` found when matching for `'
-                                + this.format(args) + '`',
-                            index: this.index, filename: this.currentFileInfo.filename };
-                    }
-                }
-
-                for (m = 0; m < candidates.length; m++) {
-                    candidate = candidates[m].group;
-                    if ((candidate === defNone) || (candidate === defaultResult)) {
-                        try {
-                            mixin = candidates[m].mixin;
-                            if (!(mixin instanceof tree.mixin.Definition)) {
-                                mixin = new tree.mixin.Definition("", [], mixin.rules, null, false);
-                                mixin.originalRuleset = mixins[m].originalRuleset || mixins[m];
-                            }
-                            Array.prototype.push.apply(
-                                  rules, mixin.evalCall(env, args, this.important).rules);
-                        } catch (e) {
-                            throw { message: e.message, index: this.index, filename: this.currentFileInfo.filename, stack: e.stack };
-                        }
-                    }
-                }
-
-                if (match) {
-                    if (!this.currentFileInfo || !this.currentFileInfo.reference) {
-                        for (i = 0; i < rules.length; i++) {
-                            rule = rules[i];
-                            if (rule.markReferenced) {
-                                rule.markReferenced();
-                            }
-                        }
-                    }
-                    return rules;
-                }
-            }
-        }
-        if (isOneFound) {
-            throw { type:    'Runtime',
-                    message: 'No matching definition was found for `' + this.format(args) + '`',
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        } else {
-            throw { type:    'Name',
-                    message: this.selector.toCSS().trim() + " is undefined",
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        }
-    },
-    format: function (args) {
-        return this.selector.toCSS().trim() + '(' +
-            (args ? args.map(function (a) {
-                var argValue = "";
-                if (a.name) {
-                    argValue += a.name + ":";
-                }
-                if (a.value.toCSS) {
-                    argValue += a.value.toCSS();
-                } else {
-                    argValue += "???";
-                }
-                return argValue;
-            }).join(', ') : "") + ")";
-    }
-};
-
-tree.mixin.Definition = function (name, params, rules, condition, variadic, frames) {
-    this.name = name;
-    this.selectors = [new(tree.Selector)([new(tree.Element)(null, name, this.index, this.currentFileInfo)])];
-    this.params = params;
-    this.condition = condition;
-    this.variadic = variadic;
-    this.arity = params.length;
-    this.rules = rules;
-    this._lookups = {};
-    this.required = params.reduce(function (count, p) {
-        if (!p.name || (p.name && !p.value)) { return count + 1; }
-        else                                 { return count; }
-    }, 0);
-    this.parent = tree.Ruleset.prototype;
-    this.frames = frames;
-};
-tree.mixin.Definition.prototype = {
-    type: "MixinDefinition",
-    accept: function (visitor) {
-        if (this.params && this.params.length) {
-            this.params = visitor.visitArray(this.params);
-        }
-        this.rules = visitor.visitArray(this.rules);
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    variable:  function (name) { return this.parent.variable.call(this, name); },
-    variables: function ()     { return this.parent.variables.call(this); },
-    find:      function ()     { return this.parent.find.apply(this, arguments); },
-    rulesets:  function ()     { return this.parent.rulesets.apply(this); },
-
-    evalParams: function (env, mixinEnv, args, evaldArguments) {
-        /*jshint boss:true */
-        var frame = new(tree.Ruleset)(null, null),
-            varargs, arg,
-            params = this.params.slice(0),
-            i, j, val, name, isNamedFound, argIndex, argsLength = 0;
-
-        mixinEnv = new tree.evalEnv(mixinEnv, [frame].concat(mixinEnv.frames));
-
-        if (args) {
-            args = args.slice(0);
-            argsLength = args.length;
-
-            for(i = 0; i < argsLength; i++) {
-                arg = args[i];
-                if (name = (arg && arg.name)) {
-                    isNamedFound = false;
-                    for(j = 0; j < params.length; j++) {
-                        if (!evaldArguments[j] && name === params[j].name) {
-                            evaldArguments[j] = arg.value.eval(env);
-                            frame.prependRule(new(tree.Rule)(name, arg.value.eval(env)));
-                            isNamedFound = true;
-                            break;
-                        }
-                    }
-                    if (isNamedFound) {
-                        args.splice(i, 1);
-                        i--;
-                        continue;
-                    } else {
-                        throw { type: 'Runtime', message: "Named argument for " + this.name +
-                            ' ' + args[i].name + ' not found' };
-                    }
-                }
-            }
-        }
-        argIndex = 0;
-        for (i = 0; i < params.length; i++) {
-            if (evaldArguments[i]) { continue; }
-
-            arg = args && args[argIndex];
-
-            if (name = params[i].name) {
-                if (params[i].variadic) {
-                    varargs = [];
-                    for (j = argIndex; j < argsLength; j++) {
-                        varargs.push(args[j].value.eval(env));
-                    }
-                    frame.prependRule(new(tree.Rule)(name, new(tree.Expression)(varargs).eval(env)));
-                } else {
-                    val = arg && arg.value;
-                    if (val) {
-                        val = val.eval(env);
-                    } else if (params[i].value) {
-                        val = params[i].value.eval(mixinEnv);
-                        frame.resetCache();
-                    } else {
-                        throw { type: 'Runtime', message: "wrong number of arguments for " + this.name +
-                            ' (' + argsLength + ' for ' + this.arity + ')' };
-                    }
-
-                    frame.prependRule(new(tree.Rule)(name, val));
-                    evaldArguments[i] = val;
-                }
-            }
-
-            if (params[i].variadic && args) {
-                for (j = argIndex; j < argsLength; j++) {
-                    evaldArguments[j] = args[j].value.eval(env);
-                }
-            }
-            argIndex++;
-        }
-
-        return frame;
-    },
-    eval: function (env) {
-        return new tree.mixin.Definition(this.name, this.params, this.rules, this.condition, this.variadic, this.frames || env.frames.slice(0));
-    },
-    evalCall: function (env, args, important) {
-        var _arguments = [],
-            mixinFrames = this.frames ? this.frames.concat(env.frames) : env.frames,
-            frame = this.evalParams(env, new(tree.evalEnv)(env, mixinFrames), args, _arguments),
-            rules, ruleset;
-
-        frame.prependRule(new(tree.Rule)('@arguments', new(tree.Expression)(_arguments).eval(env)));
-
-        rules = this.rules.slice(0);
-
-        ruleset = new(tree.Ruleset)(null, rules);
-        ruleset.originalRuleset = this;
-        ruleset = ruleset.eval(new(tree.evalEnv)(env, [this, frame].concat(mixinFrames)));
-        if (important) {
-            ruleset = this.parent.makeImportant.apply(ruleset);
-        }
-        return ruleset;
-    },
-    matchCondition: function (args, env) {
-        if (this.condition && !this.condition.eval(
-            new(tree.evalEnv)(env,
-                [this.evalParams(env, new(tree.evalEnv)(env, this.frames.concat(env.frames)), args, [])] // the parameter variables
-                    .concat(this.frames) // the parent namespace/mixin frames
-                    .concat(env.frames)))) { // the current environment frames
-            return false;
-        }
-        return true;
-    },
-    matchArgs: function (args, env) {
-        var argsLength = (args && args.length) || 0, len;
-
-        if (! this.variadic) {
-            if (argsLength < this.required)                               { return false; }
-            if (argsLength > this.params.length)                          { return false; }
-        } else {
-            if (argsLength < (this.required - 1))                         { return false; }
-        }
-
-        len = Math.min(argsLength, this.arity);
-
-        for (var i = 0; i < len; i++) {
-            if (!this.params[i].name && !this.params[i].variadic) {
-                if (args[i].value.eval(env).toCSS() != this.params[i].value.eval(env).toCSS()) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Negative = function (node) {
-    this.value = node;
-};
-tree.Negative.prototype = {
-    type: "Negative",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('-');
-        this.value.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (env.isMathOn()) {
-            return (new(tree.Operation)('*', [new(tree.Dimension)(-1), this.value])).eval(env);
-        }
-        return new(tree.Negative)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Operation = function (op, operands, isSpaced) {
-    this.op = op.trim();
-    this.operands = operands;
-    this.isSpaced = isSpaced;
-};
-tree.Operation.prototype = {
-    type: "Operation",
-    accept: function (visitor) {
-        this.operands = visitor.visit(this.operands);
-    },
-    eval: function (env) {
-        var a = this.operands[0].eval(env),
-            b = this.operands[1].eval(env);
-
-        if (env.isMathOn()) {
-            if (a instanceof tree.Dimension && b instanceof tree.Color) {
-                a = a.toColor();
-            }
-            if (b instanceof tree.Dimension && a instanceof tree.Color) {
-                b = b.toColor();
-            }
-            if (!a.operate) {
-                throw { type: "Operation",
-                        message: "Operation on an invalid type" };
-            }
-
-            return a.operate(env, this.op, b);
-        } else {
-            return new(tree.Operation)(this.op, [a, b], this.isSpaced);
-        }
-    },
-    genCSS: function (env, output) {
-        this.operands[0].genCSS(env, output);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        output.add(this.op);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        this.operands[1].genCSS(env, output);
-    },
-    toCSS: tree.toCSS
-};
-
-tree.operate = function (env, op, a, b) {
-    switch (op) {
-        case '+': return a + b;
-        case '-': return a - b;
-        case '*': return a * b;
-        case '/': return a / b;
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Paren = function (node) {
-    this.value = node;
-};
-tree.Paren.prototype = {
-    type: "Paren",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('(');
-        this.value.genCSS(env, output);
-        output.add(')');
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        return new(tree.Paren)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Quoted = function (str, content, escaped, index, currentFileInfo) {
-    this.escaped = escaped;
-    this.value = content || '';
-    this.quote = str.charAt(0);
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Quoted.prototype = {
-    type: "Quoted",
-    genCSS: function (env, output) {
-        if (!this.escaped) {
-            output.add(this.quote, this.currentFileInfo, this.index);
-        }
-        output.add(this.value);
-        if (!this.escaped) {
-            output.add(this.quote);
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var that = this;
-        var value = this.value.replace(/`([^`]+)`/g, function (_, exp) {
-            return new(tree.JavaScript)(exp, that.index, true).eval(env).value;
-        }).replace(/@\{([\w-]+)\}/g, function (_, name) {
-            var v = new(tree.Variable)('@' + name, that.index, that.currentFileInfo).eval(env, true);
-            return (v instanceof tree.Quoted) ? v.value : v.toCSS();
-        });
-        return new(tree.Quoted)(this.quote + value + this.quote, value, this.escaped, this.index, this.currentFileInfo);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left = this.toCSS(),
-            right = x.toCSS();
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Rule = function (name, value, important, merge, index, currentFileInfo, inline) {
-    this.name = name;
-    this.value = (value instanceof tree.Value || value instanceof tree.Ruleset) ? value : new(tree.Value)([value]);
-    this.important = important ? ' ' + important.trim() : '';
-    this.merge = merge;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.inline = inline || false;
-    this.variable = name.charAt && (name.charAt(0) === '@');
-};
-
-tree.Rule.prototype = {
-    type: "Rule",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.name + (env.compress ? ':' : ': '), this.currentFileInfo, this.index);
-        try {
-            this.value.genCSS(env, output);
-        }
-        catch(e) {
-            e.index = this.index;
-            e.filename = this.currentFileInfo.filename;
-            throw e;
-        }
-        output.add(this.important + ((this.inline || (env.lastRule && env.compress)) ? "" : ";"), this.currentFileInfo, this.index);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var strictMathBypass = false, name = this.name, evaldValue;
-        if (typeof name !== "string") {
-            // expand 'primitive' name directly to get
-            // things faster (~10% for benchmark.less):
-            name = (name.length === 1)
-                && (name[0] instanceof tree.Keyword)
-                    ? name[0].value : evalName(env, name);
-        }
-        if (name === "font" && !env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            evaldValue = this.value.eval(env);
-
-            if (!this.variable && evaldValue.type === "DetachedRuleset") {
-                throw { message: "Rulesets cannot be evaluated on a property.",
-                        index: this.index, filename: this.currentFileInfo.filename };
-            }
-
-            return new(tree.Rule)(name,
-                              evaldValue,
-                              this.important,
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline);
-        }
-        catch(e) {
-            if (typeof e.index !== 'number') {
-                e.index = this.index;
-                e.filename = this.currentFileInfo.filename;
-            }
-            throw e;
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-    },
-    makeImportant: function () {
-        return new(tree.Rule)(this.name,
-                              this.value,
-                              "!important",
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline);
-    }
-};
-
-function evalName(env, name) {
-    var value = "", i, n = name.length,
-        output = {add: function (s) {value += s;}};
-    for (i = 0; i < n; i++) {
-        name[i].eval(env).genCSS(env, output);
-    }
-    return value;
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.RulesetCall = function (variable) {
-    this.variable = variable;
-};
-tree.RulesetCall.prototype = {
-    type: "RulesetCall",
-    accept: function (visitor) {
-    },
-    eval: function (env) {
-        var detachedRuleset = new(tree.Variable)(this.variable).eval(env);
-        return detachedRuleset.callEval(env);
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Ruleset = function (selectors, rules, strictImports) {
-    this.selectors = selectors;
-    this.rules = rules;
-    this._lookups = {};
-    this.strictImports = strictImports;
-};
-tree.Ruleset.prototype = {
-    type: "Ruleset",
-    accept: function (visitor) {
-        if (this.paths) {
-            visitor.visitArray(this.paths, true);
-        } else if (this.selectors) {
-            this.selectors = visitor.visitArray(this.selectors);
-        }
-        if (this.rules && this.rules.length) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    eval: function (env) {
-        var thisSelectors = this.selectors, selectors,
-            selCnt, selector, i, defaultFunc = tree.defaultFunc, hasOnePassingSelector = false;
-
-        if (thisSelectors && (selCnt = thisSelectors.length)) {
-            selectors = [];
-            defaultFunc.error({
-                type: "Syntax",
-                message: "it is currently only allowed in parametric mixin guards,"
-            });
-            for (i = 0; i < selCnt; i++) {
-                selector = thisSelectors[i].eval(env);
-                selectors.push(selector);
-                if (selector.evaldCondition) {
-                    hasOnePassingSelector = true;
-                }
-            }
-            defaultFunc.reset();
-        } else {
-            hasOnePassingSelector = true;
-        }
-
-        var rules = this.rules ? this.rules.slice(0) : null,
-            ruleset = new(tree.Ruleset)(selectors, rules, this.strictImports),
-            rule, subRule;
-
-        ruleset.originalRuleset = this;
-        ruleset.root = this.root;
-        ruleset.firstRoot = this.firstRoot;
-        ruleset.allowImports = this.allowImports;
-
-        if(this.debugInfo) {
-            ruleset.debugInfo = this.debugInfo;
-        }
-
-        if (!hasOnePassingSelector) {
-            rules.length = 0;
-		}
-
-        // push the current ruleset to the frames stack
-        var envFrames = env.frames;
-        envFrames.unshift(ruleset);
-
-        // currrent selectors
-        var envSelectors = env.selectors;
-        if (!envSelectors) {
-            env.selectors = envSelectors = [];
-        }
-        envSelectors.unshift(this.selectors);
-
-        // Evaluate imports
-        if (ruleset.root || ruleset.allowImports || !ruleset.strictImports) {
-            ruleset.evalImports(env);
-        }
-
-        // Store the frames around mixin definitions,
-        // so they can be evaluated like closures when the time comes.
-        var rsRules = ruleset.rules, rsRuleCnt = rsRules ? rsRules.length : 0;
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Definition || rsRules[i] instanceof tree.DetachedRuleset) {
-                rsRules[i] = rsRules[i].eval(env);
-            }
-        }
-
-        var mediaBlockCount = (env.mediaBlocks && env.mediaBlocks.length) || 0;
-
-        // Evaluate mixin calls.
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Call) {
-                /*jshint loopfunc:true */
-                rules = rsRules[i].eval(env).filter(function(r) {
-                    if ((r instanceof tree.Rule) && r.variable) {
-                        // do not pollute the scope if the variable is
-                        // already there. consider returning false here
-                        // but we need a way to "return" variable from mixins
-                        return !(ruleset.variable(r.name));
-                    }
-                    return true;
-                });
-                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
-                rsRuleCnt += rules.length - 1;
-                i += rules.length-1;
-                ruleset.resetCache();
-            } else if (rsRules[i] instanceof tree.RulesetCall) {
-                /*jshint loopfunc:true */
-                rules = rsRules[i].eval(env).rules.filter(function(r) {
-                    if ((r instanceof tree.Rule) && r.variable) {
-                        // do not pollute the scope at all
-                        return false;
-                    }
-                    return true;
-                });
-                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
-                rsRuleCnt += rules.length - 1;
-                i += rules.length-1;
-                ruleset.resetCache();
-            }
-        }
-
-        // Evaluate everything else
-        for (i = 0; i < rsRules.length; i++) {
-            rule = rsRules[i];
-            if (! (rule instanceof tree.mixin.Definition || rule instanceof tree.DetachedRuleset)) {
-                rsRules[i] = rule = rule.eval ? rule.eval(env) : rule;
-            }
-        }
-
-        // Evaluate everything else
-        for (i = 0; i < rsRules.length; i++) {
-            rule = rsRules[i];
-            // for rulesets, check if it is a css guard and can be removed
-            if (rule instanceof tree.Ruleset && rule.selectors && rule.selectors.length === 1) {
-                // check if it can be folded in (e.g. & where)
-                if (rule.selectors[0].isJustParentSelector()) {
-                    rsRules.splice(i--, 1);
-
-                    for(var j = 0; j < rule.rules.length; j++) {
-                        subRule = rule.rules[j];
-                        if (!(subRule instanceof tree.Rule) || !subRule.variable) {
-                            rsRules.splice(++i, 0, subRule);
-                        }
-                    }
-                }
-            }
-        }
-
-        // Pop the stack
-        envFrames.shift();
-        envSelectors.shift();
-
-        if (env.mediaBlocks) {
-            for (i = mediaBlockCount; i < env.mediaBlocks.length; i++) {
-                env.mediaBlocks[i].bubbleSelectors(selectors);
-            }
-        }
-
-        return ruleset;
-    },
-    evalImports: function(env) {
-        var rules = this.rules, i, importRules;
-        if (!rules) { return; }
-
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i] instanceof tree.Import) {
-                importRules = rules[i].eval(env);
-                if (importRules && importRules.length) {
-                    rules.splice.apply(rules, [i, 1].concat(importRules));
-                    i+= importRules.length-1;
-                } else {
-                    rules.splice(i, 1, importRules);
-                }
-                this.resetCache();
-            }
-        }
-    },
-    makeImportant: function() {
-        return new tree.Ruleset(this.selectors, this.rules.map(function (r) {
-                    if (r.makeImportant) {
-                        return r.makeImportant();
-                    } else {
-                        return r;
-                    }
-                }), this.strictImports);
-    },
-    matchArgs: function (args) {
-        return !args || args.length === 0;
-    },
-    // lets you call a css selector with a guard
-    matchCondition: function (args, env) {
-        var lastSelector = this.selectors[this.selectors.length-1];
-        if (!lastSelector.evaldCondition) {
-            return false;
-        }
-        if (lastSelector.condition &&
-            !lastSelector.condition.eval(
-                new(tree.evalEnv)(env,
-                    env.frames))) {
-            return false;
-        }
-        return true;
-    },
-    resetCache: function () {
-        this._rulesets = null;
-        this._variables = null;
-        this._lookups = {};
-    },
-    variables: function () {
-        if (!this._variables) {
-            this._variables = !this.rules ? {} : this.rules.reduce(function (hash, r) {
-                if (r instanceof tree.Rule && r.variable === true) {
-                    hash[r.name] = r;
-                }
-                return hash;
-            }, {});
-        }
-        return this._variables;
-    },
-    variable: function (name) {
-        return this.variables()[name];
-    },
-    rulesets: function () {
-        if (!this.rules) { return null; }
-
-        var _Ruleset = tree.Ruleset, _MixinDefinition = tree.mixin.Definition,
-            filtRules = [], rules = this.rules, cnt = rules.length,
-            i, rule;
-
-        for (i = 0; i < cnt; i++) {
-            rule = rules[i];
-            if ((rule instanceof _Ruleset) || (rule instanceof _MixinDefinition)) {
-                filtRules.push(rule);
-            }
-        }
-
-        return filtRules;
-    },
-    prependRule: function (rule) {
-        var rules = this.rules;
-        if (rules) { rules.unshift(rule); } else { this.rules = [ rule ]; }
-    },
-    find: function (selector, self) {
-        self = self || this;
-        var rules = [], match,
-            key = selector.toCSS();
-
-        if (key in this._lookups) { return this._lookups[key]; }
-
-        this.rulesets().forEach(function (rule) {
-            if (rule !== self) {
-                for (var j = 0; j < rule.selectors.length; j++) {
-                    match = selector.match(rule.selectors[j]);
-                    if (match) {
-                        if (selector.elements.length > match) {
-                            Array.prototype.push.apply(rules, rule.find(
-                                new(tree.Selector)(selector.elements.slice(match)), self));
-                        } else {
-                            rules.push(rule);
-                        }
-                        break;
-                    }
-                }
-            }
-        });
-        this._lookups[key] = rules;
-        return rules;
-    },
-    genCSS: function (env, output) {
-        var i, j,
-            ruleNodes = [],
-            rulesetNodes = [],
-            rulesetNodeCnt,
-            debugInfo,     // Line number debugging
-            rule,
-            path;
-
-        env.tabLevel = (env.tabLevel || 0);
-
-        if (!this.root) {
-            env.tabLevel++;
-        }
-
-        var tabRuleStr = env.compress ? '' : Array(env.tabLevel + 1).join("  "),
-            tabSetStr = env.compress ? '' : Array(env.tabLevel).join("  "),
-            sep;
-
-        for (i = 0; i < this.rules.length; i++) {
-            rule = this.rules[i];
-            if (rule.rules || (rule instanceof tree.Media) || rule instanceof tree.Directive || (this.root && rule instanceof tree.Comment)) {
-                rulesetNodes.push(rule);
-            } else {
-                ruleNodes.push(rule);
-            }
-        }
-
-        // If this is the root node, we don't render
-        // a selector, or {}.
-        if (!this.root) {
-            debugInfo = tree.debugInfo(env, this, tabSetStr);
-
-            if (debugInfo) {
-                output.add(debugInfo);
-                output.add(tabSetStr);
-            }
-
-            var paths = this.paths, pathCnt = paths.length,
-                pathSubCnt;
-
-            sep = env.compress ? ',' : (',\n' + tabSetStr);
-
-            for (i = 0; i < pathCnt; i++) {
-                path = paths[i];
-                if (!(pathSubCnt = path.length)) { continue; }
-                if (i > 0) { output.add(sep); }
-
-                env.firstSelector = true;
-                path[0].genCSS(env, output);
-
-                env.firstSelector = false;
-                for (j = 1; j < pathSubCnt; j++) {
-                    path[j].genCSS(env, output);
-                }
-            }
-
-            output.add((env.compress ? '{' : ' {\n') + tabRuleStr);
-        }
-
-        // Compile rules and rulesets
-        for (i = 0; i < ruleNodes.length; i++) {
-            rule = ruleNodes[i];
-
-            // @page{ directive ends up with root elements inside it, a mix of rules and rulesets
-            // In this instance we do not know whether it is the last property
-            if (i + 1 === ruleNodes.length && (!this.root || rulesetNodes.length === 0 || this.firstRoot)) {
-                env.lastRule = true;
-            }
-
-            if (rule.genCSS) {
-                rule.genCSS(env, output);
-            } else if (rule.value) {
-                output.add(rule.value.toString());
-            }
-
-            if (!env.lastRule) {
-                output.add(env.compress ? '' : ('\n' + tabRuleStr));
-            } else {
-                env.lastRule = false;
-            }
-        }
-
-        if (!this.root) {
-            output.add((env.compress ? '}' : '\n' + tabSetStr + '}'));
-            env.tabLevel--;
-        }
-
-        sep = (env.compress ? "" : "\n") + (this.root ? tabRuleStr : tabSetStr);
-        rulesetNodeCnt = rulesetNodes.length;
-        if (rulesetNodeCnt) {
-            if (ruleNodes.length && sep) { output.add(sep); }
-            rulesetNodes[0].genCSS(env, output);
-            for (i = 1; i < rulesetNodeCnt; i++) {
-                if (sep) { output.add(sep); }
-                rulesetNodes[i].genCSS(env, output);
-            }
-        }
-
-        if (!output.isEmpty() && !env.compress && this.firstRoot) {
-            output.add('\n');
-        }
-    },
-
-    toCSS: tree.toCSS,
-
-    markReferenced: function () {
-        if (!this.selectors) {
-            return;
-        }
-        for (var s = 0; s < this.selectors.length; s++) {
-            this.selectors[s].markReferenced();
-        }
-    },
-
-    joinSelectors: function (paths, context, selectors) {
-        for (var s = 0; s < selectors.length; s++) {
-            this.joinSelector(paths, context, selectors[s]);
-        }
-    },
-
-    joinSelector: function (paths, context, selector) {
-
-        var i, j, k,
-            hasParentSelector, newSelectors, el, sel, parentSel,
-            newSelectorPath, afterParentJoin, newJoinedSelector,
-            newJoinedSelectorEmpty, lastSelector, currentElements,
-            selectorsMultiplied;
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            if (el.value === '&') {
-                hasParentSelector = true;
-            }
-        }
-
-        if (!hasParentSelector) {
-            if (context.length > 0) {
-                for (i = 0; i < context.length; i++) {
-                    paths.push(context[i].concat(selector));
-                }
-            }
-            else {
-                paths.push([selector]);
-            }
-            return;
-        }
-
-        // The paths are [[Selector]]
-        // The first list is a list of comma seperated selectors
-        // The inner list is a list of inheritance seperated selectors
-        // e.g.
-        // .a, .b {
-        //   .c {
-        //   }
-        // }
-        // == [[.a] [.c]] [[.b] [.c]]
-        //
-
-        // the elements from the current selector so far
-        currentElements = [];
-        // the current list of new selectors to add to the path.
-        // We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
-        // by the parents
-        newSelectors = [[]];
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            // non parent reference elements just get added
-            if (el.value !== "&") {
-                currentElements.push(el);
-            } else {
-                // the new list of selectors to add
-                selectorsMultiplied = [];
-
-                // merge the current list of non parent selector elements
-                // on to the current list of selectors to add
-                if (currentElements.length > 0) {
-                    this.mergeElementsOnToSelectors(currentElements, newSelectors);
-                }
-
-                // loop through our current selectors
-                for (j = 0; j < newSelectors.length; j++) {
-                    sel = newSelectors[j];
-                    // if we don't have any parent paths, the & might be in a mixin so that it can be used
-                    // whether there are parents or not
-                    if (context.length === 0) {
-                        // the combinator used on el should now be applied to the next element instead so that
-                        // it is not lost
-                        if (sel.length > 0) {
-                            sel[0].elements = sel[0].elements.slice(0);
-                            sel[0].elements.push(new(tree.Element)(el.combinator, '', el.index, el.currentFileInfo));
-                        }
-                        selectorsMultiplied.push(sel);
-                    }
-                    else {
-                        // and the parent selectors
-                        for (k = 0; k < context.length; k++) {
-                            parentSel = context[k];
-                            // We need to put the current selectors
-                            // then join the last selector's elements on to the parents selectors
-
-                            // our new selector path
-                            newSelectorPath = [];
-                            // selectors from the parent after the join
-                            afterParentJoin = [];
-                            newJoinedSelectorEmpty = true;
-
-                            //construct the joined selector - if & is the first thing this will be empty,
-                            // if not newJoinedSelector will be the last set of elements in the selector
-                            if (sel.length > 0) {
-                                newSelectorPath = sel.slice(0);
-                                lastSelector = newSelectorPath.pop();
-                                newJoinedSelector = selector.createDerived(lastSelector.elements.slice(0));
-                                newJoinedSelectorEmpty = false;
-                            }
-                            else {
-                                newJoinedSelector = selector.createDerived([]);
-                            }
-
-                            //put together the parent selectors after the join
-                            if (parentSel.length > 1) {
-                                afterParentJoin = afterParentJoin.concat(parentSel.slice(1));
-                            }
-
-                            if (parentSel.length > 0) {
-                                newJoinedSelectorEmpty = false;
-
-                                // join the elements so far with the first part of the parent
-                                newJoinedSelector.elements.push(new(tree.Element)(el.combinator, parentSel[0].elements[0].value, el.index, el.currentFileInfo));
-                                newJoinedSelector.elements = newJoinedSelector.elements.concat(parentSel[0].elements.slice(1));
-                            }
-
-                            if (!newJoinedSelectorEmpty) {
-                                // now add the joined selector
-                                newSelectorPath.push(newJoinedSelector);
-                            }
-
-                            // and the rest of the parent
-                            newSelectorPath = newSelectorPath.concat(afterParentJoin);
-
-                            // add that to our new set of selectors
-                            selectorsMultiplied.push(newSelectorPath);
-                        }
-                    }
-                }
-
-                // our new selectors has been multiplied, so reset the state
-                newSelectors = selectorsMultiplied;
-                currentElements = [];
-            }
-        }
-
-        // if we have any elements left over (e.g. .a& .b == .b)
-        // add them on to all the current selectors
-        if (currentElements.length > 0) {
-            this.mergeElementsOnToSelectors(currentElements, newSelectors);
-        }
-
-        for (i = 0; i < newSelectors.length; i++) {
-            if (newSelectors[i].length > 0) {
-                paths.push(newSelectors[i]);
-            }
-        }
-    },
-
-    mergeElementsOnToSelectors: function(elements, selectors) {
-        var i, sel;
-
-        if (selectors.length === 0) {
-            selectors.push([ new(tree.Selector)(elements) ]);
-            return;
-        }
-
-        for (i = 0; i < selectors.length; i++) {
-            sel = selectors[i];
-
-            // if the previous thing in sel is a parent this needs to join on to it
-            if (sel.length > 0) {
-                sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));
-            }
-            else {
-                sel.push(new(tree.Selector)(elements));
-            }
-        }
-    }
-};
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Selector = function (elements, extendList, condition, index, currentFileInfo, isReferenced) {
-    this.elements = elements;
-    this.extendList = extendList;
-    this.condition = condition;
-    this.currentFileInfo = currentFileInfo || {};
-    this.isReferenced = isReferenced;
-    if (!condition) {
-        this.evaldCondition = true;
-    }
-};
-tree.Selector.prototype = {
-    type: "Selector",
-    accept: function (visitor) {
-        if (this.elements) {
-            this.elements = visitor.visitArray(this.elements);
-        }
-        if (this.extendList) {
-            this.extendList = visitor.visitArray(this.extendList);
-        }
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    createDerived: function(elements, extendList, evaldCondition) {
-        evaldCondition = (evaldCondition != null) ? evaldCondition : this.evaldCondition;
-        var newSelector = new(tree.Selector)(elements, extendList || this.extendList, null, this.index, this.currentFileInfo, this.isReferenced);
-        newSelector.evaldCondition = evaldCondition;
-        newSelector.mediaEmpty = this.mediaEmpty;
-        return newSelector;
-    },
-    match: function (other) {
-        var elements = this.elements,
-            len = elements.length,
-            olen, i;
-
-        other.CacheElements();
-
-        olen = other._elements.length;
-        if (olen === 0 || len < olen) {
-            return 0;
-        } else {
-            for (i = 0; i < olen; i++) {
-                if (elements[i].value !== other._elements[i]) {
-                    return 0;
-                }
-            }
-        }
-
-        return olen; // return number of matched elements
-    },
-    CacheElements: function(){
-        var css = '', len, v, i;
-
-        if( !this._elements ){
-
-            len = this.elements.length;
-            for(i = 0; i < len; i++){
-
-                v = this.elements[i];
-                css += v.combinator.value;
-
-                if( !v.value.value ){
-                    css += v.value;
-                    continue;
-                }
-
-                if( typeof v.value.value !== "string" ){
-                    css = '';
-                    break;
-                }
-                css += v.value.value;
-            }
-
-            this._elements = css.match(/[,&#\.\w-]([\w-]|(\\.))*/g);
-
-            if (this._elements) {
-                if (this._elements[0] === "&") {
-                    this._elements.shift();
-                }
-
-            } else {
-                this._elements = [];
-            }
-
-        }
-    },
-    isJustParentSelector: function() {
-        return !this.mediaEmpty &&
-            this.elements.length === 1 &&
-            this.elements[0].value === '&' &&
-            (this.elements[0].combinator.value === ' ' || this.elements[0].combinator.value === '');
-    },
-    eval: function (env) {
-        var evaldCondition = this.condition && this.condition.eval(env),
-            elements = this.elements, extendList = this.extendList;
-
-        elements = elements && elements.map(function (e) { return e.eval(env); });
-        extendList = extendList && extendList.map(function(extend) { return extend.eval(env); });
-
-        return this.createDerived(elements, extendList, evaldCondition);
-    },
-    genCSS: function (env, output) {
-        var i, element;
-        if ((!env || !env.firstSelector) && this.elements[0].combinator.value === "") {
-            output.add(' ', this.currentFileInfo, this.index);
-        }
-        if (!this._css) {
-            //TODO caching? speed comparison?
-            for(i = 0; i < this.elements.length; i++) {
-                element = this.elements[i];
-                element.genCSS(env, output);
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    markReferenced: function () {
-        this.isReferenced = true;
-    },
-    getIsReferenced: function() {
-        return !this.currentFileInfo.reference || this.isReferenced;
-    },
-    getIsOutput: function() {
-        return this.evaldCondition;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.UnicodeDescriptor = function (value) {
-    this.value = value;
-};
-tree.UnicodeDescriptor.prototype = {
-    type: "UnicodeDescriptor",
-    genCSS: function (env, output) {
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    eval: function () { return this; }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.URL = function (val, currentFileInfo, isEvald) {
-    this.value = val;
-    this.currentFileInfo = currentFileInfo;
-    this.isEvald = isEvald;
-};
-tree.URL.prototype = {
-    type: "Url",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add("url(");
-        this.value.genCSS(env, output);
-        output.add(")");
-    },
-    toCSS: tree.toCSS,
-    eval: function (ctx) {
-        var val = this.value.eval(ctx),
-            rootpath;
-
-        if (!this.isEvald) {
-            // Add the base path if the URL is relative
-            rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-            if (rootpath && typeof val.value === "string" && ctx.isPathRelative(val.value)) {
-                if (!val.quote) {
-                    rootpath = rootpath.replace(/[\(\)'"\s]/g, function(match) { return "\\"+match; });
-                }
-                val.value = rootpath + val.value;
-            }
-
-            val.value = ctx.normalizePath(val.value);
-
-            // Add url args if enabled
-            if (ctx.urlArgs) {
-                if (!val.value.match(/^\s*data:/)) {
-                    var delimiter = val.value.indexOf('?') === -1 ? '?' : '&';
-                    var urlArgs = delimiter + ctx.urlArgs;
-                    if (val.value.indexOf('#') !== -1) {
-                        val.value = val.value.replace('#', urlArgs + '#');
-                    } else {
-                        val.value += urlArgs;
-                    }
-                }
-            }
-        }
-
-        return new(tree.URL)(val, this.currentFileInfo, true);
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Value = function (value) {
-    this.value = value;
-};
-tree.Value.prototype = {
-    type: "Value",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        if (this.value.length === 1) {
-            return this.value[0].eval(env);
-        } else {
-            return new(tree.Value)(this.value.map(function (v) {
-                return v.eval(env);
-            }));
-        }
-    },
-    genCSS: function (env, output) {
-        var i;
-        for(i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i+1 < this.value.length) {
-                output.add((env && env.compress) ? ',' : ', ');
-            }
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Variable = function (name, index, currentFileInfo) {
-    this.name = name;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo || {};
-};
-tree.Variable.prototype = {
-    type: "Variable",
-    eval: function (env) {
-        var variable, name = this.name;
-
-        if (name.indexOf('@@') === 0) {
-            name = '@' + new(tree.Variable)(name.slice(1)).eval(env).value;
-        }
-
-        if (this.evaluating) {
-            throw { type: 'Name',
-                    message: "Recursive variable definition for " + name,
-                    filename: this.currentFileInfo.file,
-                    index: this.index };
-        }
-
-        this.evaluating = true;
-
-        variable = tree.find(env.frames, function (frame) {
-            var v = frame.variable(name);
-            if (v) {
-                return v.value.eval(env);
-            }
-        });
-        if (variable) {
-            this.evaluating = false;
-            return variable;
-        } else {
-            throw { type: 'Name',
-                    message: "variable " + name + " is undefined",
-                    filename: this.currentFileInfo.filename,
-                    index: this.index };
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-    var parseCopyProperties = [
-        'paths',            // option - unmodified - paths to search for imports on
-        'optimization',     // option - optimization level (for the chunker)
-        'files',            // list of files that have been imported, used for import-once
-        'contents',         // map - filename to contents of all the files
-        'contentsIgnoredChars', // map - filename to lines at the begining of each file to ignore
-        'relativeUrls',     // option - whether to adjust URL's to be relative
-        'rootpath',         // option - rootpath to append to URL's
-        'strictImports',    // option -
-        'insecure',         // option - whether to allow imports from insecure ssl hosts
-        'dumpLineNumbers',  // option - whether to dump line numbers
-        'compress',         // option - whether to compress
-        'processImports',   // option - whether to process imports. if false then imports will not be imported
-        'syncImport',       // option - whether to import synchronously
-        'javascriptEnabled',// option - whether JavaScript is enabled. if undefined, defaults to true
-        'mime',             // browser only - mime type for sheet import
-        'useFileCache',     // browser only - whether to use the per file session cache
-        'currentFileInfo'   // information about the current file - for error reporting and importing and making urls relative etc.
-    ];
-
-    //currentFileInfo = {
-    //  'relativeUrls' - option - whether to adjust URL's to be relative
-    //  'filename' - full resolved filename of current file
-    //  'rootpath' - path to append to normal URLs for this node
-    //  'currentDirectory' - path to the current file, absolute
-    //  'rootFilename' - filename of the base file
-    //  'entryPath' - absolute path to the entry file
-    //  'reference' - whether the file should not be output and only output parts that are referenced
-
-    tree.parseEnv = function(options) {
-        copyFromOriginal(options, this, parseCopyProperties);
-
-        if (!this.contents) { this.contents = {}; }
-        if (!this.contentsIgnoredChars) { this.contentsIgnoredChars = {}; }
-        if (!this.files) { this.files = {}; }
-
-        if (!this.currentFileInfo) {
-            var filename = (options && options.filename) || "input";
-            var entryPath = filename.replace(/[^\/\\]*$/, "");
-            if (options) {
-                options.filename = null;
-            }
-            this.currentFileInfo = {
-                filename: filename,
-                relativeUrls: this.relativeUrls,
-                rootpath: (options && options.rootpath) || "",
-                currentDirectory: entryPath,
-                entryPath: entryPath,
-                rootFilename: filename
-            };
-        }
-    };
-
-    var evalCopyProperties = [
-        'silent',         // whether to swallow errors and warnings
-        'verbose',        // whether to log more activity
-        'compress',       // whether to compress
-        'yuicompress',    // whether to compress with the outside tool yui compressor
-        'ieCompat',       // whether to enforce IE compatibility (IE8 data-uri)
-        'strictMath',     // whether math has to be within parenthesis
-        'strictUnits',    // whether units need to evaluate correctly
-        'cleancss',       // whether to compress with clean-css
-        'sourceMap',      // whether to output a source map
-        'importMultiple', // whether we are currently importing multiple copies
-        'urlArgs'         // whether to add args into url tokens
-        ];
-
-    tree.evalEnv = function(options, frames) {
-        copyFromOriginal(options, this, evalCopyProperties);
-
-        this.frames = frames || [];
-    };
-
-    tree.evalEnv.prototype.inParenthesis = function () {
-        if (!this.parensStack) {
-            this.parensStack = [];
-        }
-        this.parensStack.push(true);
-    };
-
-    tree.evalEnv.prototype.outOfParenthesis = function () {
-        this.parensStack.pop();
-    };
-
-    tree.evalEnv.prototype.isMathOn = function () {
-        return this.strictMath ? (this.parensStack && this.parensStack.length) : true;
-    };
-
-    tree.evalEnv.prototype.isPathRelative = function (path) {
-        return !/^(?:[a-z-]+:|\/)/.test(path);
-    };
-
-    tree.evalEnv.prototype.normalizePath = function( path ) {
-        var
-          segments = path.split("/").reverse(),
-          segment;
-
-        path = [];
-        while (segments.length !== 0 ) {
-            segment = segments.pop();
-            switch( segment ) {
-                case ".":
-                    break;
-                case "..":
-                    if ((path.length === 0) || (path[path.length - 1] === "..")) {
-                        path.push( segment );
-                    } else {
-                        path.pop();
-                    }
-                    break;
-                default:
-                    path.push( segment );
-                    break;
-            }
-        }
-
-        return path.join("/");
-    };
-
-    //todo - do the same for the toCSS env
-    //tree.toCSSEnv = function (options) {
-    //};
-
-    var copyFromOriginal = function(original, destination, propertiesToCopy) {
-        if (!original) { return; }
-
-        for(var i = 0; i < propertiesToCopy.length; i++) {
-            if (original.hasOwnProperty(propertiesToCopy[i])) {
-                destination[propertiesToCopy[i]] = original[propertiesToCopy[i]];
-            }
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    var _visitArgs = { visitDeeper: true },
-        _hasIndexed = false;
-
-    function _noop(node) {
-        return node;
-    }
-
-    function indexNodeTypes(parent, ticker) {
-        // add .typeIndex to tree node types for lookup table
-        var key, child;
-        for (key in parent) {
-            if (parent.hasOwnProperty(key)) {
-                child = parent[key];
-                switch (typeof child) {
-                    case "function":
-                        // ignore bound functions directly on tree which do not have a prototype
-                        // or aren't nodes
-                        if (child.prototype && child.prototype.type) {
-                            child.prototype.typeIndex = ticker++;
-                        }
-                        break;
-                    case "object":
-                        ticker = indexNodeTypes(child, ticker);
-                        break;
-                }
-            }
-        }
-        return ticker;
-    }
-
-    tree.visitor = function(implementation) {
-        this._implementation = implementation;
-        this._visitFnCache = [];
-
-        if (!_hasIndexed) {
-            indexNodeTypes(tree, 1);
-            _hasIndexed = true;
-        }
-    };
-
-    tree.visitor.prototype = {
-        visit: function(node) {
-            if (!node) {
-                return node;
-            }
-
-            var nodeTypeIndex = node.typeIndex;
-            if (!nodeTypeIndex) {
-                return node;
-            }
-
-            var visitFnCache = this._visitFnCache,
-                impl = this._implementation,
-                aryIndx = nodeTypeIndex << 1,
-                outAryIndex = aryIndx | 1,
-                func = visitFnCache[aryIndx],
-                funcOut = visitFnCache[outAryIndex],
-                visitArgs = _visitArgs,
-                fnName;
-
-            visitArgs.visitDeeper = true;
-
-            if (!func) {
-                fnName = "visit" + node.type;
-                func = impl[fnName] || _noop;
-                funcOut = impl[fnName + "Out"] || _noop;
-                visitFnCache[aryIndx] = func;
-                visitFnCache[outAryIndex] = funcOut;
-            }
-
-            if (func !== _noop) {
-                var newNode = func.call(impl, node, visitArgs);
-                if (impl.isReplacing) {
-                    node = newNode;
-                }
-            }
-
-            if (visitArgs.visitDeeper && node && node.accept) {
-                node.accept(this);
-            }
-
-            if (funcOut != _noop) {
-                funcOut.call(impl, node);
-            }
-
-            return node;
-        },
-        visitArray: function(nodes, nonReplacing) {
-            if (!nodes) {
-                return nodes;
-            }
-
-            var cnt = nodes.length, i;
-
-            // Non-replacing
-            if (nonReplacing || !this._implementation.isReplacing) {
-                for (i = 0; i < cnt; i++) {
-                    this.visit(nodes[i]);
-                }
-                return nodes;
-            }
-
-            // Replacing
-            var out = [];
-            for (i = 0; i < cnt; i++) {
-                var evald = this.visit(nodes[i]);
-                if (!evald.splice) {
-                    out.push(evald);
-                } else if (evald.length) {
-                    this.flatten(evald, out);
-                }
-            }
-            return out;
-        },
-        flatten: function(arr, out) {
-            if (!out) {
-                out = [];
-            }
-
-            var cnt, i, item,
-                nestedCnt, j, nestedItem;
-
-            for (i = 0, cnt = arr.length; i < cnt; i++) {
-                item = arr[i];
-                if (!item.splice) {
-                    out.push(item);
-                    continue;
-                }
-
-                for (j = 0, nestedCnt = item.length; j < nestedCnt; j++) {
-                    nestedItem = item[j];
-                    if (!nestedItem.splice) {
-                        out.push(nestedItem);
-                    } else if (nestedItem.length) {
-                        this.flatten(nestedItem, out);
-                    }
-                }
-            }
-
-            return out;
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.importVisitor = function(importer, finish, evalEnv, onceFileDetectionMap, recursionDetector) {
-        this._visitor = new tree.visitor(this);
-        this._importer = importer;
-        this._finish = finish;
-        this.env = evalEnv || new tree.evalEnv();
-        this.importCount = 0;
-        this.onceFileDetectionMap = onceFileDetectionMap || {};
-        this.recursionDetector = {};
-        if (recursionDetector) {
-            for(var fullFilename in recursionDetector) {
-                if (recursionDetector.hasOwnProperty(fullFilename)) {
-                    this.recursionDetector[fullFilename] = true;
-                }
-            }
-        }
-    };
-
-    tree.importVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            var error;
-            try {
-                // process the contents
-                this._visitor.visit(root);
-            }
-            catch(e) {
-                error = e;
-            }
-
-            this.isFinished = true;
-
-            if (this.importCount === 0) {
-                this._finish(error);
-            }
-        },
-        visitImport: function (importNode, visitArgs) {
-            var importVisitor = this,
-                evaldImportNode,
-                inlineCSS = importNode.options.inline;
-
-            if (!importNode.css || inlineCSS) {
-
-                try {
-                    evaldImportNode = importNode.evalForImport(this.env);
-                } catch(e){
-                    if (!e.filename) { e.index = importNode.index; e.filename = importNode.currentFileInfo.filename; }
-                    // attempt to eval properly and treat as css
-                    importNode.css = true;
-                    // if that fails, this error will be thrown
-                    importNode.error = e;
-                }
-
-                if (evaldImportNode && (!evaldImportNode.css || inlineCSS)) {
-                    importNode = evaldImportNode;
-                    this.importCount++;
-                    var env = new tree.evalEnv(this.env, this.env.frames.slice(0));
-
-                    if (importNode.options.multiple) {
-                        env.importMultiple = true;
-                    }
-
-                    this._importer.push(importNode.getPath(), importNode.currentFileInfo, importNode.options, function (e, root, importedAtRoot, fullPath) {
-                        if (e && !e.filename) { e.index = importNode.index; e.filename = importNode.currentFileInfo.filename; }
-
-                        if (!env.importMultiple) {
-                            if (importedAtRoot) {
-                                importNode.skip = true;
-                            } else {
-                                importNode.skip = function() {
-                                    if (fullPath in importVisitor.onceFileDetectionMap) {
-                                        return true;
-                                    }
-                                    importVisitor.onceFileDetectionMap[fullPath] = true;
-                                    return false;
-                                };
-                            }
-                        }
-
-                        var subFinish = function(e) {
-                            importVisitor.importCount--;
-
-                            if (importVisitor.importCount === 0 && importVisitor.isFinished) {
-                                importVisitor._finish(e);
-                            }
-                        };
-
-                        if (root) {
-                            importNode.root = root;
-                            importNode.importedFilename = fullPath;
-                            var duplicateImport = importedAtRoot || fullPath in importVisitor.recursionDetector;
-
-                            if (!inlineCSS && (env.importMultiple || !duplicateImport)) {
-                                importVisitor.recursionDetector[fullPath] = true;
-                                new(tree.importVisitor)(importVisitor._importer, subFinish, env, importVisitor.onceFileDetectionMap, importVisitor.recursionDetector)
-                                    .run(root);
-                                return;
-                            }
-                        }
-
-                        subFinish();
-                    });
-                }
-            }
-            visitArgs.visitDeeper = false;
-            return importNode;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-            return ruleNode;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            this.env.frames.unshift(directiveNode);
-            return directiveNode;
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.env.frames.shift();
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            this.env.frames.unshift(mixinDefinitionNode);
-            return mixinDefinitionNode;
-        },
-        visitMixinDefinitionOut: function (mixinDefinitionNode) {
-            this.env.frames.shift();
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            this.env.frames.unshift(rulesetNode);
-            return rulesetNode;
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.env.frames.shift();
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            this.env.frames.unshift(mediaNode.ruleset);
-            return mediaNode;
-        },
-        visitMediaOut: function (mediaNode) {
-            this.env.frames.shift();
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.joinSelectorVisitor = function() {
-        this.contexts = [[]];
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.joinSelectorVisitor.prototype = {
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1],
-                paths = [], selectors;
-
-            this.contexts.push(paths);
-
-            if (! rulesetNode.root) {
-                selectors = rulesetNode.selectors;
-                if (selectors) {
-                    selectors = selectors.filter(function(selector) { return selector.getIsOutput(); });
-                    rulesetNode.selectors = selectors.length ? selectors : (selectors = null);
-                    if (selectors) { rulesetNode.joinSelectors(paths, context, selectors); }
-                }
-                if (!selectors) { rulesetNode.rules = null; }
-                rulesetNode.paths = paths;
-            }
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.contexts.length = this.contexts.length - 1;
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1];
-            mediaNode.rules[0].root = (context.length === 0 || context[0].multiMedia);
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.toCSSVisitor = function(env) {
-        this._visitor = new tree.visitor(this);
-        this._env = env;
-    };
-
-    tree.toCSSVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-
-        visitRule: function (ruleNode, visitArgs) {
-            if (ruleNode.variable) {
-                return [];
-            }
-            return ruleNode;
-        },
-
-        visitMixinDefinition: function (mixinNode, visitArgs) {
-            // mixin definitions do not get eval'd - this means they keep state
-            // so we have to clear that state here so it isn't used if toCSS is called twice
-            mixinNode.frames = [];
-            return [];
-        },
-
-        visitExtend: function (extendNode, visitArgs) {
-            return [];
-        },
-
-        visitComment: function (commentNode, visitArgs) {
-            if (commentNode.isSilent(this._env)) {
-                return [];
-            }
-            return commentNode;
-        },
-
-        visitMedia: function(mediaNode, visitArgs) {
-            mediaNode.accept(this._visitor);
-            visitArgs.visitDeeper = false;
-
-            if (!mediaNode.rules.length) {
-                return [];
-            }
-            return mediaNode;
-        },
-
-        visitDirective: function(directiveNode, visitArgs) {
-            if (directiveNode.currentFileInfo.reference && !directiveNode.isReferenced) {
-                return [];
-            }
-            if (directiveNode.name === "@charset") {
-                // Only output the debug info together with subsequent @charset definitions
-                // a comment (or @media statement) before the actual @charset directive would
-                // be considered illegal css as it has to be on the first line
-                if (this.charset) {
-                    if (directiveNode.debugInfo) {
-                        var comment = new tree.Comment("/* " + directiveNode.toCSS(this._env).replace(/\n/g, "")+" */\n");
-                        comment.debugInfo = directiveNode.debugInfo;
-                        return this._visitor.visit(comment);
-                    }
-                    return [];
-                }
-                this.charset = true;
-            }
-            return directiveNode;
-        },
-
-        checkPropertiesInRoot: function(rules) {
-            var ruleNode;
-            for(var i = 0; i < rules.length; i++) {
-                ruleNode = rules[i];
-                if (ruleNode instanceof tree.Rule && !ruleNode.variable) {
-                    throw { message: "properties must be inside selector blocks, they cannot be in the root.",
-                        index: ruleNode.index, filename: ruleNode.currentFileInfo ? ruleNode.currentFileInfo.filename : null};
-                }
-            }
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var rule, rulesets = [];
-            if (rulesetNode.firstRoot) {
-                this.checkPropertiesInRoot(rulesetNode.rules);
-            }
-            if (! rulesetNode.root) {
-                if (rulesetNode.paths) {
-                    rulesetNode.paths = rulesetNode.paths
-                        .filter(function(p) {
-                            var i;
-                            if (p[0].elements[0].combinator.value === ' ') {
-                                p[0].elements[0].combinator = new(tree.Combinator)('');
-                            }
-                            for(i = 0; i < p.length; i++) {
-                                if (p[i].getIsReferenced() && p[i].getIsOutput()) {
-                                    return true;
-                                }
-                            }
-                            return false;
-                        });
-                }
-
-                // Compile rules and rulesets
-                var nodeRules = rulesetNode.rules, nodeRuleCnt = nodeRules ? nodeRules.length : 0;
-                for (var i = 0; i < nodeRuleCnt; ) {
-                    rule = nodeRules[i];
-                    if (rule && rule.rules) {
-                        // visit because we are moving them out from being a child
-                        rulesets.push(this._visitor.visit(rule));
-                        nodeRules.splice(i, 1);
-                        nodeRuleCnt--;
-                        continue;
-                    }
-                    i++;
-                }
-                // accept the visitor to remove rules and refactor itself
-                // then we can decide now whether we want it or not
-                if (nodeRuleCnt > 0) {
-                    rulesetNode.accept(this._visitor);
-                } else {
-                    rulesetNode.rules = null;
-                }
-                visitArgs.visitDeeper = false;
-
-                nodeRules = rulesetNode.rules;
-                if (nodeRules) {
-                    this._mergeRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-                if (nodeRules) {
-                    this._removeDuplicateRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-
-                // now decide whether we keep the ruleset
-                if (nodeRules && nodeRules.length > 0 && rulesetNode.paths.length > 0) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            } else {
-                rulesetNode.accept(this._visitor);
-                visitArgs.visitDeeper = false;
-                if (rulesetNode.firstRoot || (rulesetNode.rules && rulesetNode.rules.length > 0)) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            }
-            if (rulesets.length === 1) {
-                return rulesets[0];
-            }
-            return rulesets;
-        },
-
-        _removeDuplicateRules: function(rules) {
-            if (!rules) { return; }
-
-            // remove duplicates
-            var ruleCache = {},
-                ruleList, rule, i;
-
-            for(i = rules.length - 1; i >= 0 ; i--) {
-                rule = rules[i];
-                if (rule instanceof tree.Rule) {
-                    if (!ruleCache[rule.name]) {
-                        ruleCache[rule.name] = rule;
-                    } else {
-                        ruleList = ruleCache[rule.name];
-                        if (ruleList instanceof tree.Rule) {
-                            ruleList = ruleCache[rule.name] = [ruleCache[rule.name].toCSS(this._env)];
-                        }
-                        var ruleCSS = rule.toCSS(this._env);
-                        if (ruleList.indexOf(ruleCSS) !== -1) {
-                            rules.splice(i, 1);
-                        } else {
-                            ruleList.push(ruleCSS);
-                        }
-                    }
-                }
-            }
-        },
-
-        _mergeRules: function (rules) {
-            if (!rules) { return; }
-
-            var groups = {},
-                parts,
-                rule,
-                key;
-
-            for (var i = 0; i < rules.length; i++) {
-                rule = rules[i];
-
-                if ((rule instanceof tree.Rule) && rule.merge) {
-                    key = [rule.name,
-                        rule.important ? "!" : ""].join(",");
-
-                    if (!groups[key]) {
-                        groups[key] = [];
-                    } else {
-                        rules.splice(i--, 1);
-                    }
-
-                    groups[key].push(rule);
-                }
-            }
-
-            Object.keys(groups).map(function (k) {
-
-                function toExpression(values) {
-                    return new (tree.Expression)(values.map(function (p) {
-                        return p.value;
-                    }));
-                }
-
-                function toValue(values) {
-                    return new (tree.Value)(values.map(function (p) {
-                        return p;
-                    }));
-                }
-
-                parts = groups[k];
-
-                if (parts.length > 1) {
-                    rule = parts[0];
-                    var spacedGroups = [];
-                    var lastSpacedGroup = [];
-                    parts.map(function (p) {
-                    if (p.merge==="+") {
-                        if (lastSpacedGroup.length > 0) {
-                                spacedGroups.push(toExpression(lastSpacedGroup));
-                            }
-                            lastSpacedGroup = [];
-                        }
-                        lastSpacedGroup.push(p);
-                    });
-                    spacedGroups.push(toExpression(lastSpacedGroup));
-                    rule.value = toValue(spacedGroups);
-                }
-            });
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    /*jshint loopfunc:true */
-
-    tree.extendFinderVisitor = function() {
-        this._visitor = new tree.visitor(this);
-        this.contexts = [];
-        this.allExtendsStack = [[]];
-    };
-
-    tree.extendFinderVisitor.prototype = {
-        run: function (root) {
-            root = this._visitor.visit(root);
-            root.allExtends = this.allExtendsStack[0];
-            return root;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-
-            var i, j, extend, allSelectorsExtendList = [], extendList;
-
-            // get &:extend(.a); rules which apply to all selectors in this ruleset
-            var rules = rulesetNode.rules, ruleCnt = rules ? rules.length : 0;
-            for(i = 0; i < ruleCnt; i++) {
-                if (rulesetNode.rules[i] instanceof tree.Extend) {
-                    allSelectorsExtendList.push(rules[i]);
-                    rulesetNode.extendOnEveryPath = true;
-                }
-            }
-
-            // now find every selector and apply the extends that apply to all extends
-            // and the ones which apply to an individual extend
-            var paths = rulesetNode.paths;
-            for(i = 0; i < paths.length; i++) {
-                var selectorPath = paths[i],
-                    selector = selectorPath[selectorPath.length - 1],
-                    selExtendList = selector.extendList;
-
-                extendList = selExtendList ? selExtendList.slice(0).concat(allSelectorsExtendList)
-                                           : allSelectorsExtendList;
-
-                if (extendList) {
-                    extendList = extendList.map(function(allSelectorsExtend) {
-                        return allSelectorsExtend.clone();
-                    });
-                }
-
-                for(j = 0; j < extendList.length; j++) {
-                    this.foundExtends = true;
-                    extend = extendList[j];
-                    extend.findSelfSelectors(selectorPath);
-                    extend.ruleset = rulesetNode;
-                    if (j === 0) { extend.firstExtendOnThisSelectorPath = true; }
-                    this.allExtendsStack[this.allExtendsStack.length-1].push(extend);
-                }
-            }
-
-            this.contexts.push(rulesetNode.selectors);
-        },
-        visitRulesetOut: function (rulesetNode) {
-            if (!rulesetNode.root) {
-                this.contexts.length = this.contexts.length - 1;
-            }
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            mediaNode.allExtends = [];
-            this.allExtendsStack.push(mediaNode.allExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            directiveNode.allExtends = [];
-            this.allExtendsStack.push(directiveNode.allExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-    tree.processExtendsVisitor = function() {
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.processExtendsVisitor.prototype = {
-        run: function(root) {
-            var extendFinder = new tree.extendFinderVisitor();
-            extendFinder.run(root);
-            if (!extendFinder.foundExtends) { return root; }
-            root.allExtends = root.allExtends.concat(this.doExtendChaining(root.allExtends, root.allExtends));
-            this.allExtendsStack = [root.allExtends];
-            return this._visitor.visit(root);
-        },
-        doExtendChaining: function (extendsList, extendsListTarget, iterationCount) {
-            //
-            // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering and pasting
-            // the selector we would do normally, but we are also adding an extend with the same target selector
-            // this means this new extend can then go and alter other extends
-            //
-            // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors
-            // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already processed if
-            // we look at each selector at a time, as is done in visitRuleset
-
-            var extendIndex, targetExtendIndex, matches, extendsToAdd = [], newSelector, extendVisitor = this, selectorPath, extend, targetExtend, newExtend;
-
-            iterationCount = iterationCount || 0;
-
-            //loop through comparing every extend with every target extend.
-            // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place
-            // e.g.  .a:extend(.b) {}  and .b:extend(.c) {} then the first extend extends the second one
-            // and the second is the target.
-            // the seperation into two lists allows us to process a subset of chains with a bigger set, as is the
-            // case when processing media queries
-            for(extendIndex = 0; extendIndex < extendsList.length; extendIndex++){
-                for(targetExtendIndex = 0; targetExtendIndex < extendsListTarget.length; targetExtendIndex++){
-
-                    extend = extendsList[extendIndex];
-                    targetExtend = extendsListTarget[targetExtendIndex];
-
-                    // look for circular references
-                    if( extend.parent_ids.indexOf( targetExtend.object_id ) >= 0 ){ continue; }
-
-                    // find a match in the target extends self selector (the bit before :extend)
-                    selectorPath = [targetExtend.selfSelectors[0]];
-                    matches = extendVisitor.findMatch(extend, selectorPath);
-
-                    if (matches.length) {
-
-                        // we found a match, so for each self selector..
-                        extend.selfSelectors.forEach(function(selfSelector) {
-
-                            // process the extend as usual
-                            newSelector = extendVisitor.extendSelector(matches, selectorPath, selfSelector);
-
-                            // but now we create a new extend from it
-                            newExtend = new(tree.Extend)(targetExtend.selector, targetExtend.option, 0);
-                            newExtend.selfSelectors = newSelector;
-
-                            // add the extend onto the list of extends for that selector
-                            newSelector[newSelector.length-1].extendList = [newExtend];
-
-                            // record that we need to add it.
-                            extendsToAdd.push(newExtend);
-                            newExtend.ruleset = targetExtend.ruleset;
-
-                            //remember its parents for circular references
-                            newExtend.parent_ids = newExtend.parent_ids.concat(targetExtend.parent_ids, extend.parent_ids);
-
-                            // only process the selector once.. if we have :extend(.a,.b) then multiple
-                            // extends will look at the same selector path, so when extending
-                            // we know that any others will be duplicates in terms of what is added to the css
-                            if (targetExtend.firstExtendOnThisSelectorPath) {
-                                newExtend.firstExtendOnThisSelectorPath = true;
-                                targetExtend.ruleset.paths.push(newSelector);
-                            }
-                        });
-                    }
-                }
-            }
-
-            if (extendsToAdd.length) {
-                // try to detect circular references to stop a stack overflow.
-                // may no longer be needed.
-                this.extendChainCount++;
-                if (iterationCount > 100) {
-                    var selectorOne = "{unable to calculate}";
-                    var selectorTwo = "{unable to calculate}";
-                    try
-                    {
-                        selectorOne = extendsToAdd[0].selfSelectors[0].toCSS();
-                        selectorTwo = extendsToAdd[0].selector.toCSS();
-                    }
-                    catch(e) {}
-                    throw {message: "extend circular reference detected. One of the circular extends is currently:"+selectorOne+":extend(" + selectorTwo+")"};
-                }
-
-                // now process the new extends on the existing rules so that we can handle a extending b extending c ectending d extending e...
-                return extendsToAdd.concat(extendVisitor.doExtendChaining(extendsToAdd, extendsListTarget, iterationCount+1));
-            } else {
-                return extendsToAdd;
-            }
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitSelector: function (selectorNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-            var matches, pathIndex, extendIndex, allExtends = this.allExtendsStack[this.allExtendsStack.length-1], selectorsToAdd = [], extendVisitor = this, selectorPath;
-
-            // look at each selector path in the ruleset, find any extend matches and then copy, find and replace
-
-            for(extendIndex = 0; extendIndex < allExtends.length; extendIndex++) {
-                for(pathIndex = 0; pathIndex < rulesetNode.paths.length; pathIndex++) {
-                    selectorPath = rulesetNode.paths[pathIndex];
-
-                    // extending extends happens initially, before the main pass
-                    if (rulesetNode.extendOnEveryPath) { continue; }
-                    var extendList = selectorPath[selectorPath.length-1].extendList;
-                    if (extendList && extendList.length) { continue; }
-
-                    matches = this.findMatch(allExtends[extendIndex], selectorPath);
-
-                    if (matches.length) {
-
-                        allExtends[extendIndex].selfSelectors.forEach(function(selfSelector) {
-                            selectorsToAdd.push(extendVisitor.extendSelector(matches, selectorPath, selfSelector));
-                        });
-                    }
-                }
-            }
-            rulesetNode.paths = rulesetNode.paths.concat(selectorsToAdd);
-        },
-        findMatch: function (extend, haystackSelectorPath) {
-            //
-            // look through the haystack selector path to try and find the needle - extend.selector
-            // returns an array of selector matches that can then be replaced
-            //
-            var haystackSelectorIndex, hackstackSelector, hackstackElementIndex, haystackElement,
-                targetCombinator, i,
-                extendVisitor = this,
-                needleElements = extend.selector.elements,
-                potentialMatches = [], potentialMatch, matches = [];
-
-            // loop through the haystack elements
-            for(haystackSelectorIndex = 0; haystackSelectorIndex < haystackSelectorPath.length; haystackSelectorIndex++) {
-                hackstackSelector = haystackSelectorPath[haystackSelectorIndex];
-
-                for(hackstackElementIndex = 0; hackstackElementIndex < hackstackSelector.elements.length; hackstackElementIndex++) {
-
-                    haystackElement = hackstackSelector.elements[hackstackElementIndex];
-
-                    // if we allow elements before our match we can add a potential match every time. otherwise only at the first element.
-                    if (extend.allowBefore || (haystackSelectorIndex === 0 && hackstackElementIndex === 0)) {
-                        potentialMatches.push({pathIndex: haystackSelectorIndex, index: hackstackElementIndex, matched: 0, initialCombinator: haystackElement.combinator});
-                    }
-
-                    for(i = 0; i < potentialMatches.length; i++) {
-                        potentialMatch = potentialMatches[i];
-
-                        // selectors add " " onto the first element. When we use & it joins the selectors together, but if we don't
-                        // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to work out
-                        // what the resulting combinator will be
-                        targetCombinator = haystackElement.combinator.value;
-                        if (targetCombinator === '' && hackstackElementIndex === 0) {
-                            targetCombinator = ' ';
-                        }
-
-                        // if we don't match, null our match to indicate failure
-                        if (!extendVisitor.isElementValuesEqual(needleElements[potentialMatch.matched].value, haystackElement.value) ||
-                            (potentialMatch.matched > 0 && needleElements[potentialMatch.matched].combinator.value !== targetCombinator)) {
-                            potentialMatch = null;
-                        } else {
-                            potentialMatch.matched++;
-                        }
-
-                        // if we are still valid and have finished, test whether we have elements after and whether these are allowed
-                        if (potentialMatch) {
-                            potentialMatch.finished = potentialMatch.matched === needleElements.length;
-                            if (potentialMatch.finished &&
-                                (!extend.allowAfter && (hackstackElementIndex+1 < hackstackSelector.elements.length || haystackSelectorIndex+1 < haystackSelectorPath.length))) {
-                                potentialMatch = null;
-                            }
-                        }
-                        // if null we remove, if not, we are still valid, so either push as a valid match or continue
-                        if (potentialMatch) {
-                            if (potentialMatch.finished) {
-                                potentialMatch.length = needleElements.length;
-                                potentialMatch.endPathIndex = haystackSelectorIndex;
-                                potentialMatch.endPathElementIndex = hackstackElementIndex + 1; // index after end of match
-                                potentialMatches.length = 0; // we don't allow matches to overlap, so start matching again
-                                matches.push(potentialMatch);
-                            }
-                        } else {
-                            potentialMatches.splice(i, 1);
-                            i--;
-                        }
-                    }
-                }
-            }
-            return matches;
-        },
-        isElementValuesEqual: function(elementValue1, elementValue2) {
-            if (typeof elementValue1 === "string" || typeof elementValue2 === "string") {
-                return elementValue1 === elementValue2;
-            }
-            if (elementValue1 instanceof tree.Attribute) {
-                if (elementValue1.op !== elementValue2.op || elementValue1.key !== elementValue2.key) {
-                    return false;
-                }
-                if (!elementValue1.value || !elementValue2.value) {
-                    if (elementValue1.value || elementValue2.value) {
-                        return false;
-                    }
-                    return true;
-                }
-                elementValue1 = elementValue1.value.value || elementValue1.value;
-                elementValue2 = elementValue2.value.value || elementValue2.value;
-                return elementValue1 === elementValue2;
-            }
-            elementValue1 = elementValue1.value;
-            elementValue2 = elementValue2.value;
-            if (elementValue1 instanceof tree.Selector) {
-                if (!(elementValue2 instanceof tree.Selector) || elementValue1.elements.length !== elementValue2.elements.length) {
-                    return false;
-                }
-                for(var i = 0; i <elementValue1.elements.length; i++) {
-                    if (elementValue1.elements[i].combinator.value !== elementValue2.elements[i].combinator.value) {
-                        if (i !== 0 || (elementValue1.elements[i].combinator.value || ' ') !== (elementValue2.elements[i].combinator.value || ' ')) {
-                            return false;
-                        }
-                    }
-                    if (!this.isElementValuesEqual(elementValue1.elements[i].value, elementValue2.elements[i].value)) {
-                        return false;
-                    }
-                }
-                return true;
-            }
-            return false;
-        },
-        extendSelector:function (matches, selectorPath, replacementSelector) {
-
-            //for a set of matches, replace each match with the replacement selector
-
-            var currentSelectorPathIndex = 0,
-                currentSelectorPathElementIndex = 0,
-                path = [],
-                matchIndex,
-                selector,
-                firstElement,
-                match,
-                newElements;
-
-            for (matchIndex = 0; matchIndex < matches.length; matchIndex++) {
-                match = matches[matchIndex];
-                selector = selectorPath[match.pathIndex];
-                firstElement = new tree.Element(
-                    match.initialCombinator,
-                    replacementSelector.elements[0].value,
-                    replacementSelector.elements[0].index,
-                    replacementSelector.elements[0].currentFileInfo
-                );
-
-                if (match.pathIndex > currentSelectorPathIndex && currentSelectorPathElementIndex > 0) {
-                    path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-
-                newElements = selector.elements
-                    .slice(currentSelectorPathElementIndex, match.index)
-                    .concat([firstElement])
-                    .concat(replacementSelector.elements.slice(1));
-
-                if (currentSelectorPathIndex === match.pathIndex && matchIndex > 0) {
-                    path[path.length - 1].elements =
-                        path[path.length - 1].elements.concat(newElements);
-                } else {
-                    path = path.concat(selectorPath.slice(currentSelectorPathIndex, match.pathIndex));
-
-                    path.push(new tree.Selector(
-                        newElements
-                    ));
-                }
-                currentSelectorPathIndex = match.endPathIndex;
-                currentSelectorPathElementIndex = match.endPathElementIndex;
-                if (currentSelectorPathElementIndex >= selectorPath[currentSelectorPathIndex].elements.length) {
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-            }
-
-            if (currentSelectorPathIndex < selectorPath.length && currentSelectorPathElementIndex > 0) {
-                path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                currentSelectorPathIndex++;
-            }
-
-            path = path.concat(selectorPath.slice(currentSelectorPathIndex, selectorPath.length));
-
-            return path;
-        },
-        visitRulesetOut: function (rulesetNode) {
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var newAllExtends = mediaNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, mediaNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            var newAllExtends = directiveNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, directiveNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    tree.sourceMapOutput = function (options) {
-        this._css = [];
-        this._rootNode = options.rootNode;
-        this._writeSourceMap = options.writeSourceMap;
-        this._contentsMap = options.contentsMap;
-        this._contentsIgnoredCharsMap = options.contentsIgnoredCharsMap;
-        this._sourceMapFilename = options.sourceMapFilename;
-        this._outputFilename = options.outputFilename;
-        this._sourceMapURL = options.sourceMapURL;
-        if (options.sourceMapBasepath) {
-            this._sourceMapBasepath = options.sourceMapBasepath.replace(/\\/g, '/');
-        }
-        this._sourceMapRootpath = options.sourceMapRootpath;
-        this._outputSourceFiles = options.outputSourceFiles;
-        this._sourceMapGeneratorConstructor = options.sourceMapGenerator || require("source-map").SourceMapGenerator;
-
-        if (this._sourceMapRootpath && this._sourceMapRootpath.charAt(this._sourceMapRootpath.length-1) !== '/') {
-            this._sourceMapRootpath += '/';
-        }
-
-        this._lineNumber = 0;
-        this._column = 0;
-    };
-
-    tree.sourceMapOutput.prototype.normalizeFilename = function(filename) {
-        filename = filename.replace(/\\/g, '/');
-
-        if (this._sourceMapBasepath && filename.indexOf(this._sourceMapBasepath) === 0) {
-            filename = filename.substring(this._sourceMapBasepath.length);
-            if (filename.charAt(0) === '\\' || filename.charAt(0) === '/') {
-               filename = filename.substring(1);
-            }
-        }
-        return (this._sourceMapRootpath || "") + filename;
-    };
-
-    tree.sourceMapOutput.prototype.add = function(chunk, fileInfo, index, mapLines) {
-
-        //ignore adding empty strings
-        if (!chunk) {
-            return;
-        }
-
-        var lines,
-            sourceLines,
-            columns,
-            sourceColumns,
-            i;
-
-        if (fileInfo) {
-            var inputSource = this._contentsMap[fileInfo.filename];
-
-            // remove vars/banner added to the top of the file
-            if (this._contentsIgnoredCharsMap[fileInfo.filename]) {
-                // adjust the index
-                index -= this._contentsIgnoredCharsMap[fileInfo.filename];
-                if (index < 0) { index = 0; }
-                // adjust the source
-                inputSource = inputSource.slice(this._contentsIgnoredCharsMap[fileInfo.filename]);
-            }
-            inputSource = inputSource.substring(0, index);
-            sourceLines = inputSource.split("\n");
-            sourceColumns = sourceLines[sourceLines.length-1];
-        }
-
-        lines = chunk.split("\n");
-        columns = lines[lines.length-1];
-
-        if (fileInfo) {
-            if (!mapLines) {
-                this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + 1, column: this._column},
-                    original: { line: sourceLines.length, column: sourceColumns.length},
-                    source: this.normalizeFilename(fileInfo.filename)});
-            } else {
-                for(i = 0; i < lines.length; i++) {
-                    this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + i + 1, column: i === 0 ? this._column : 0},
-                        original: { line: sourceLines.length + i, column: i === 0 ? sourceColumns.length : 0},
-                        source: this.normalizeFilename(fileInfo.filename)});
-                }
-            }
-        }
-
-        if (lines.length === 1) {
-            this._column += columns.length;
-        } else {
-            this._lineNumber += lines.length - 1;
-            this._column = columns.length;
-        }
-
-        this._css.push(chunk);
-    };
-
-    tree.sourceMapOutput.prototype.isEmpty = function() {
-        return this._css.length === 0;
-    };
-
-    tree.sourceMapOutput.prototype.toCSS = function(env) {
-        this._sourceMapGenerator = new this._sourceMapGeneratorConstructor({ file: this._outputFilename, sourceRoot: null });
-
-        if (this._outputSourceFiles) {
-            for(var filename in this._contentsMap) {
-                if (this._contentsMap.hasOwnProperty(filename))
-                {
-                    var source = this._contentsMap[filename];
-                    if (this._contentsIgnoredCharsMap[filename]) {
-                        source = source.slice(this._contentsIgnoredCharsMap[filename]);
-                    }
-                    this._sourceMapGenerator.setSourceContent(this.normalizeFilename(filename), source);
-                }
-            }
-        }
-
-        this._rootNode.genCSS(env, this);
-
-        if (this._css.length > 0) {
-            var sourceMapURL,
-                sourceMapContent = JSON.stringify(this._sourceMapGenerator.toJSON());
-
-            if (this._sourceMapURL) {
-                sourceMapURL = this._sourceMapURL;
-            } else if (this._sourceMapFilename) {
-                sourceMapURL = this.normalizeFilename(this._sourceMapFilename);
-            }
-
-            if (this._writeSourceMap) {
-                this._writeSourceMap(sourceMapContent);
-            } else {
-                sourceMapURL = "data:application/json," + encodeURIComponent(sourceMapContent);
-            }
-
-            if (sourceMapURL) {
-                this._css.push("/*# sourceMappingURL=" + sourceMapURL + " */");
-            }
-        }
-
-        return this._css.join('');
-    };
-
-})(require('./tree'));
-
-//
-// browser.js - client-side engine
-//
-/*global less, window, document, XMLHttpRequest, location */
-
-var isFileProtocol = /^(file|chrome(-extension)?|resource|qrc|app):/.test(location.protocol);
-
-less.env = less.env || (location.hostname == '127.0.0.1' ||
-                        location.hostname == '0.0.0.0'   ||
-                        location.hostname == 'localhost' ||
-                        (location.port &&
-                          location.port.length > 0)      ||
-                        isFileProtocol                   ? 'development'
-                                                         : 'production');
-
-var logLevel = {
-    debug: 3,
-    info: 2,
-    errors: 1,
-    none: 0
-};
-
-// The amount of logging in the javascript console.
-// 3 - Debug, information and errors
-// 2 - Information and errors
-// 1 - Errors
-// 0 - None
-// Defaults to 2
-less.logLevel = typeof(less.logLevel) != 'undefined' ? less.logLevel : (less.env === 'development' ?  logLevel.debug : logLevel.errors);
-
-// Load styles asynchronously (default: false)
-//
-// This is set to `false` by default, so that the body
-// doesn't start loading before the stylesheets are parsed.
-// Setting this to `true` can result in flickering.
-//
-less.async = less.async || false;
-less.fileAsync = less.fileAsync || false;
-
-// Interval between watch polls
-less.poll = less.poll || (isFileProtocol ? 1000 : 1500);
-
-//Setup user functions
-if (less.functions) {
-    for(var func in less.functions) {
-        if (less.functions.hasOwnProperty(func)) {
-            less.tree.functions[func] = less.functions[func];
-        }
-   }
-}
-
-var dumpLineNumbers = /!dumpLineNumbers:(comments|mediaquery|all)/.exec(location.hash);
-if (dumpLineNumbers) {
-    less.dumpLineNumbers = dumpLineNumbers[1];
-}
-
-var typePattern = /^text\/(x-)?less$/;
-var cache = null;
-var fileCache = {};
-
-function log(str) {
-	console.log(str);
-}
-
-function extractId(href) {
-    return href.replace(/^[a-z-]+:\/+?[^\/]+/, '' )  // Remove protocol & domain
-        .replace(/^\//,                 '' )  // Remove root /
-        .replace(/\.[a-zA-Z]+$/,        '' )  // Remove simple extension
-        .replace(/[^\.\w-]+/g,          '-')  // Replace illegal characters
-        .replace(/\./g,                 ':'); // Replace dots with colons(for valid id)
-}
-
-function errorConsole(e, rootHref) {
-    var template = '{line} {content}';
-    var filename = e.filename || rootHref;
-    var errors = [];
-    var content = (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        " in " + filename + " ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':\n' +
-            errors.join('\n');
-    } else if (e.stack) {
-        content += e.stack;
-    }
-    //log(content, logLevel.errors);
-}
-
-function createCSS(styles, sheet, lastModified) {
-    // Strip the query-string
-    var href = sheet.href || '';
-
-    // If there is no title set, use the filename, minus the extension
-    var id = 'less:' + (sheet.title || extractId(href));
-
-    // If this has already been inserted into the DOM, we may need to replace it
-    var oldCss = document.getElementById(id);
-    var keepOldCss = false;
-
-    // Create a new stylesheet node for insertion or (if necessary) replacement
-    var css = document.createElement('style');
-    css.setAttribute('type', 'text/css');
-    if (sheet.media) {
-        css.setAttribute('media', sheet.media);
-    }
-    css.id = id;
-
-    if (css.styleSheet) { // IE
-        try {
-            css.styleSheet.cssText = styles;
-        } catch (e) {
-            throw new(Error)("Couldn't reassign styleSheet.cssText.");
-        }
-    } else {
-        css.appendChild(document.createTextNode(styles));
-
-        // If new contents match contents of oldCss, don't replace oldCss
-        keepOldCss = (oldCss !== null && oldCss.childNodes.length > 0 && css.childNodes.length > 0 &&
-            oldCss.firstChild.nodeValue === css.firstChild.nodeValue);
-    }
-
-    var head = document.getElementsByTagName('head')[0];
-
-    // If there is no oldCss, just append; otherwise, only append if we need
-    // to replace oldCss with an updated stylesheet
-    if (oldCss === null || keepOldCss === false) {
-        var nextEl = sheet && sheet.nextSibling || null;
-        if (nextEl) {
-            nextEl.parentNode.insertBefore(css, nextEl);
-        } else {
-            head.appendChild(css);
-        }
-    }
-    if (oldCss && keepOldCss === false) {
-        oldCss.parentNode.removeChild(oldCss);
-    }
-
-    // Don't update the local store if the file wasn't modified
-    if (lastModified && cache) {
-        //log('saving ' + href + ' to cache.', logLevel.info);
-        try {
-            cache.setItem(href, styles);
-            cache.setItem(href + ':timestamp', lastModified);
-        } catch(e) {
-            //TODO - could do with adding more robust error handling
-            //log('failed to save', logLevel.errors);
-        }
-    }
-}
-
-function postProcessCSS(styles) {
-    if (less.postProcessor && typeof less.postProcessor === 'function') {
-        styles = less.postProcessor.call(styles, styles) || styles;
-    }
-    return styles;
-}
-
-function errorHTML(e, rootHref) {
-    var id = 'less-error-message:' + extractId(rootHref || "");
-    var template = '<li><label>{line}</label><pre class="{class}">{content}</pre></li>';
-    var elem = document.createElement('div'), timer, content, errors = [];
-    var filename = e.filename || rootHref;
-    var filenameNoPath = filename.match(/([^\/]+(\?.*)?)$/)[1];
-
-    elem.id        = id;
-    elem.className = "less-error-message";
-
-    content = '<h3>'  + (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        '</h3>' + '<p>in <a href="' + filename   + '">' + filenameNoPath + "</a> ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':</p>' +
-            '<ul>' + errors.join('') + '</ul>';
-    } else if (e.stack) {
-        content += '<br/>' + e.stack.split('\n').slice(1).join('<br/>');
-    }
-    elem.innerHTML = content;
-
-    // CSS for error messages
-    createCSS([
-        '.less-error-message ul, .less-error-message li {',
-        'list-style-type: none;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message label {',
-        'font-size: 12px;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'color: #cc7777;',
-        '}',
-        '.less-error-message pre {',
-        'color: #dd6666;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        'display: inline-block;',
-        '}',
-        '.less-error-message pre.line {',
-        'color: #ff0000;',
-        '}',
-        '.less-error-message h3 {',
-        'font-size: 20px;',
-        'font-weight: bold;',
-        'padding: 15px 0 5px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message a {',
-        'color: #10a',
-        '}',
-        '.less-error-message .error {',
-        'color: red;',
-        'font-weight: bold;',
-        'padding-bottom: 2px;',
-        'border-bottom: 1px dashed red;',
-        '}'
-    ].join('\n'), { title: 'error-message' });
-
-    elem.style.cssText = [
-        "font-family: Arial, sans-serif",
-        "border: 1px solid #e00",
-        "background-color: #eee",
-        "border-radius: 5px",
-        "-webkit-border-radius: 5px",
-        "-moz-border-radius: 5px",
-        "color: #e00",
-        "padding: 15px",
-        "margin-bottom: 15px"
-    ].join(';');
-
-    if (less.env == 'development') {
-        timer = setInterval(function () {
-            if (document.body) {
-                if (document.getElementById(id)) {
-                    document.body.replaceChild(elem, document.getElementById(id));
-                } else {
-                    document.body.insertBefore(elem, document.body.firstChild);
-                }
-                clearInterval(timer);
-            }
-        }, 10);
-    }
-}
-
-function error(e, rootHref) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        errorHTML(e, rootHref);
-    } else if (less.errorReporting === "console") {
-        errorConsole(e, rootHref);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("add", e, rootHref);
-    }
-}
-
-function removeErrorHTML(path) {
-    var node = document.getElementById('less-error-message:' + extractId(path));
-    if (node) {
-        node.parentNode.removeChild(node);
-    }
-}
-
-function removeErrorConsole(path) {
-    //no action
-}
-
-function removeError(path) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        removeErrorHTML(path);
-    } else if (less.errorReporting === "console") {
-        removeErrorConsole(path);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("remove", path);
-    }
-}
-
-function loadStyles(modifyVars) {
-    var styles = document.getElementsByTagName('style'),
-        style;
-    for (var i = 0; i < styles.length; i++) {
-        style = styles[i];
-        if (style.type.match(typePattern)) {
-            var env = new less.tree.parseEnv(less),
-                lessText = style.innerHTML || '';
-            env.filename = document.location.href.replace(/#.*$/, '');
-
-            if (modifyVars || less.globalVars) {
-                env.useFileCache = true;
-            }
-
-            /*jshint loopfunc:true */
-            // use closure to store current value of i
-            var callback = (function(style) {
-                return function (e, cssAST) {
-                    if (e) {
-                        return error(e, "inline");
-                    }
-                    var css = cssAST.toCSS(less);
-                    style.type = 'text/css';
-                    if (style.styleSheet) {
-                        style.styleSheet.cssText = css;
-                    } else {
-                        style.innerHTML = css;
-                    }
-                };
-            })(style);
-            new(less.Parser)(env).parse(lessText, callback, {globalVars: less.globalVars, modifyVars: modifyVars});
-        }
-    }
-}
-
-function extractUrlParts(url, baseUrl) {
-    // urlParts[1] = protocol&hostname || /
-    // urlParts[2] = / if path relative to host base
-    // urlParts[3] = directories
-    // urlParts[4] = filename
-    // urlParts[5] = parameters
-
-    var urlPartsRegex = /^((?:[a-z-]+:)?\/+?(?:[^\/\?#]*\/)|([\/\\]))?((?:[^\/\\\?#]*[\/\\])*)([^\/\\\?#]*)([#\?].*)?$/i,
-        urlParts = url.match(urlPartsRegex),
-        returner = {}, directories = [], i, baseUrlParts;
-
-    if (!urlParts) {
-        throw new Error("Could not parse sheet href - '"+url+"'");
-    }
-
-    // Stylesheets in IE don't always return the full path
-    if (!urlParts[1] || urlParts[2]) {
-        baseUrlParts = baseUrl.match(urlPartsRegex);
-        if (!baseUrlParts) {
-            throw new Error("Could not parse page url - '"+baseUrl+"'");
-        }
-        urlParts[1] = urlParts[1] || baseUrlParts[1] || "";
-        if (!urlParts[2]) {
-            urlParts[3] = baseUrlParts[3] + urlParts[3];
-        }
-    }
-
-    if (urlParts[3]) {
-        directories = urlParts[3].replace(/\\/g, "/").split("/");
-
-        // extract out . before .. so .. doesn't absorb a non-directory
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".") {
-                directories.splice(i, 1);
-                i -= 1;
-            }
-        }
-
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".." && i > 0) {
-                directories.splice(i-1, 2);
-                i -= 2;
-            }
-        }
-    }
-
-    returner.hostPart = urlParts[1];
-    returner.directories = directories;
-    returner.path = urlParts[1] + directories.join("/");
-    returner.fileUrl = returner.path + (urlParts[4] || "");
-    returner.url = returner.fileUrl + (urlParts[5] || "");
-    return returner;
-}
-
-function pathDiff(url, baseUrl) {
-    // diff between two paths to create a relative path
-
-    var urlParts = extractUrlParts(url),
-        baseUrlParts = extractUrlParts(baseUrl),
-        i, max, urlDirectories, baseUrlDirectories, diff = "";
-    if (urlParts.hostPart !== baseUrlParts.hostPart) {
-        return "";
-    }
-    max = Math.max(baseUrlParts.directories.length, urlParts.directories.length);
-    for(i = 0; i < max; i++) {
-        if (baseUrlParts.directories[i] !== urlParts.directories[i]) { break; }
-    }
-    baseUrlDirectories = baseUrlParts.directories.slice(i);
-    urlDirectories = urlParts.directories.slice(i);
-    for(i = 0; i < baseUrlDirectories.length-1; i++) {
-        diff += "../";
-    }
-    for(i = 0; i < urlDirectories.length-1; i++) {
-        diff += urlDirectories[i] + "/";
-    }
-    return diff;
-}
-
-function getXMLHttpRequest() {
-    if (window.XMLHttpRequest && (window.location.protocol !== "file:" || !window.ActiveXObject)) {
-        return new XMLHttpRequest();
-    } else {
-        try {
-            /*global ActiveXObject */
-            return new ActiveXObject("Microsoft.XMLHTTP");
-        } catch (e) {
-            //log("browser doesn't support AJAX.", logLevel.errors);
-            return null;
-        }
-    }
-}
-
-function doXHR(url, type, callback, errback) {
-    var xhr = getXMLHttpRequest();
-    var async = isFileProtocol ? less.fileAsync : less.async;
-
-    if (typeof(xhr.overrideMimeType) === 'function') {
-        xhr.overrideMimeType('text/css');
-    }
-    //log("XHR: Getting '" + url + "'", logLevel.debug);
-    xhr.open('GET', url, async);
-    xhr.setRequestHeader('Accept', type || 'text/x-less, text/css; q=0.9, */*; q=0.5');
-    xhr.send(null);
-
-    function handleResponse(xhr, callback, errback) {
-        if (xhr.status >= 200 && xhr.status < 300) {
-            callback(xhr.responseText,
-                xhr.getResponseHeader("Last-Modified"));
-        } else if (typeof(errback) === 'function') {
-            errback(xhr.status, url);
-        }
-    }
-
-    if (isFileProtocol && !less.fileAsync) {
-        if (xhr.status === 0 || (xhr.status >= 200 && xhr.status < 300)) {
-            callback(xhr.responseText);
-        } else {
-            errback(xhr.status, url);
-        }
-    } else if (async) {
-        xhr.onreadystatechange = function () {
-            if (xhr.readyState == 4) {
-                handleResponse(xhr, callback, errback);
-            }
-        };
-    } else {
-        handleResponse(xhr, callback, errback);
-    }
-}
-
-function loadFile(originalHref, currentFileInfo, callback, env, modifyVars) {
-
-    if (currentFileInfo && currentFileInfo.currentDirectory && !/^([a-z-]+:)?\//.test(originalHref)) {
-        originalHref = currentFileInfo.currentDirectory + originalHref;
-    }
-
-    // sheet may be set to the stylesheet for the initial load or a collection of properties including
-    // some env variables for imports
-    var hrefParts = extractUrlParts(originalHref, window.location.href);
-    var href      = hrefParts.url;
-    var newFileInfo = {
-        currentDirectory: hrefParts.path,
-        filename: href
-    };
-
-    if (currentFileInfo) {
-        newFileInfo.entryPath = currentFileInfo.entryPath;
-        newFileInfo.rootpath = currentFileInfo.rootpath;
-        newFileInfo.rootFilename = currentFileInfo.rootFilename;
-        newFileInfo.relativeUrls = currentFileInfo.relativeUrls;
-    } else {
-        newFileInfo.entryPath = hrefParts.path;
-        newFileInfo.rootpath = less.rootpath || hrefParts.path;
-        newFileInfo.rootFilename = href;
-        newFileInfo.relativeUrls = env.relativeUrls;
-    }
-
-    if (newFileInfo.relativeUrls) {
-        if (env.rootpath) {
-            newFileInfo.rootpath = extractUrlParts(env.rootpath + pathDiff(hrefParts.path, newFileInfo.entryPath)).path;
-        } else {
-            newFileInfo.rootpath = hrefParts.path;
-        }
-    }
-
-    if (env.useFileCache && fileCache[href]) {
-        try {
-            var lessText = fileCache[href];
-            callback(null, lessText, href, newFileInfo, { lastModified: new Date() });
-        } catch (e) {
-            callback(e, null, href);
-        }
-        return;
-    }
-
-    doXHR(href, env.mime, function (data, lastModified) {
-        // per file cache
-        fileCache[href] = data;
-
-        // Use remote copy (re-parse)
-        try {
-            callback(null, data, href, newFileInfo, { lastModified: lastModified });
-        } catch (e) {
-            callback(e, null, href);
-        }
-    }, function (status, url) {
-        callback({ type: 'File', message: "'" + url + "' wasn't found (" + status + ")" }, null, href);
-    });
-}
-
-function loadStyleSheet(sheet, callback, reload, remaining, modifyVars) {
-
-    var env = new less.tree.parseEnv(less);
-    env.mime = sheet.type;
-
-    if (modifyVars || less.globalVars) {
-        env.useFileCache = true;
-    }
-
-    loadFile(sheet.href, null, function(e, data, path, newFileInfo, webInfo) {
-
-        if (webInfo) {
-            webInfo.remaining = remaining;
-
-            var css       = cache && cache.getItem(path),
-                timestamp = cache && cache.getItem(path + ':timestamp');
-
-            if (!reload && timestamp && webInfo.lastModified &&
-                (new(Date)(webInfo.lastModified).valueOf() ===
-                    new(Date)(timestamp).valueOf())) {
-                // Use local copy
-                createCSS(css, sheet);
-                webInfo.local = true;
-                callback(null, null, data, sheet, webInfo, path);
-                return;
-            }
-        }
-
-        //TODO add tests around how this behaves when reloading
-        removeError(path);
-
-        if (data) {
-            env.currentFileInfo = newFileInfo;
-            new(less.Parser)(env).parse(data, function (e, root) {
-                if (e) { return callback(e, null, null, sheet); }
-                try {
-                    callback(e, root, data, sheet, webInfo, path);
-                } catch (e) {
-                    callback(e, null, null, sheet);
-                }
-            }, {modifyVars: modifyVars, globalVars: less.globalVars});
-        } else {
-            callback(e, null, null, sheet, webInfo, path);
-        }
-    }, env, modifyVars);
-}
-
-function loadStyleSheets(callback, reload, modifyVars) {
-    for (var i = 0; i < less.sheets.length; i++) {
-        loadStyleSheet(less.sheets[i], callback, reload, less.sheets.length - (i + 1), modifyVars);
-    }
-}
-
-function initRunningMode(){
-    if (less.env === 'development') {
-        less.optimization = 0;
-        less.watchTimer = setInterval(function () {
-            if (less.watchMode) {
-                loadStyleSheets(function (e, root, _, sheet, env) {
-                    if (e) {
-                        error(e, sheet.href);
-                    } else if (root) {
-                        var styles = root.toCSS(less);
-                        styles = postProcessCSS(styles);
-                        createCSS(styles, sheet, env.lastModified);
-                    }
-                });
-            }
-        }, less.poll);
-    } else {
-        less.optimization = 3;
-    }
-}
-
-
-
-//
-// Watch mode
-//
-less.watch   = function () {
-    if (!less.watchMode ){
-        less.env = 'development';
-         initRunningMode();
-    }
-    this.watchMode = true;
-    return true;
-};
-
-less.unwatch = function () {clearInterval(less.watchTimer); this.watchMode = false; return false; };
-
-if (/!watch/.test(location.hash)) {
-    less.watch();
-}
-
-if (less.env != 'development') {
-    try {
-        cache = (typeof(window.localStorage) === 'undefined') ? null : window.localStorage;
-    } catch (_) {}
-}
-
-//
-// Get all <link> tags with the 'rel' attribute set to "stylesheet/less"
-//
-var links = document.getElementsByTagName('link');
-
-less.sheets = [];
-
-for (var i = 0; i < links.length; i++) {
-    if (links[i].rel === 'stylesheet/less' || (links[i].rel.match(/stylesheet/) &&
-       (links[i].type.match(typePattern)))) {
-        less.sheets.push(links[i]);
-    }
-}
-
-//
-// With this function, it's possible to alter variables and re-render
-// CSS without reloading less-files
-//
-less.modifyVars = function(record) {
-    less.refresh(false, record);
-};
-
-less.refresh = function (reload, modifyVars) {
-    var startTime, endTime;
-    startTime = endTime = new Date();
-
-    loadStyleSheets(function (e, root, _, sheet, env) {
-        if (e) {
-            return error(e, sheet.href);
-        }
-        if (env.local) {
-            //log("loading " + sheet.href + " from cache.", logLevel.info);
-        } else {
-            //log("parsed " + sheet.href + " successfully.", logLevel.debug);
-            //var styles = root.toCSS(less);
-            //styles = postProcessCSS(styles);
-            //createCSS(styles, sheet, env.lastModified);
-
-
-
-            // less.php changes
-            var css = root.toCSS(less);
-            function totextarea(){
-                var textarea = document.getElementById('lessjs_textarea');
-                if( textarea ){
-                    textarea.value = css;
-                    diffUsingJS(0);
-                }else{
-                    window.setTimeout(totextarea,300);
-                }
-            }
-            totextarea();
-
-
-        }
-        log("css for " + sheet.href + " generated in " + (new Date() - endTime) + 'ms', logLevel.info);
-        if (env.remaining === 0) {
-            //log("less has finished. css generated in " + (new Date() - startTime) + 'ms', logLevel.info);
-        }
-        endTime = new Date();
-    }, reload, modifyVars);
-
-    loadStyles(modifyVars);
-};
-
-less.refreshStyles = loadStyles;
-
-less.Parser.fileLoader = loadFile;
-
-less.refresh(less.env === 'development');
-
-// amd.js
-//
-// Define Less as an AMD module.
-if (typeof define === "function" && define.amd) {
-    define(function () { return less; } );
-}
-
-})(window);
\ No newline at end of file
diff --git a/test/assets/less-1.7.1.js b/test/assets/less-1.7.1.js
deleted file mode 100644
index c62264fc..00000000
--- a/test/assets/less-1.7.1.js
+++ /dev/null
@@ -1,7936 +0,0 @@
-/*!
- * Less - Leaner CSS v1.7.1
- * http://lesscss.org
- *
- * Copyright (c) 2009-2014, Alexis Sellier <self@cloudhead.net>
- * Licensed under the Apache v2 License.
- *
- */
-
- /** * @license Apache v2
- */
-
-
-
-(function (window, undefined) {//
-// Stub out `require` in the browser
-//
-function require(arg) {
-    return window.less[arg.split('/')[1]];
-};
-
-
-if (typeof(window.less) === 'undefined' || typeof(window.less.nodeType) !== 'undefined') { window.less = {}; }
-less = window.less;
-tree = window.less.tree = {};
-less.mode = 'browser';
-
-var less, tree;
-
-// Node.js does not have a header file added which defines less
-if (less === undefined) {
-    less = exports;
-    tree = require('./tree');
-    less.mode = 'node';
-}
-//
-// less.js - parser
-//
-//    A relatively straight-forward predictive parser.
-//    There is no tokenization/lexing stage, the input is parsed
-//    in one sweep.
-//
-//    To make the parser fast enough to run in the browser, several
-//    optimization had to be made:
-//
-//    - Matching and slicing on a huge input is often cause of slowdowns.
-//      The solution is to chunkify the input into smaller strings.
-//      The chunks are stored in the `chunks` var,
-//      `j` holds the current chunk index, and `currentPos` holds
-//      the index of the current chunk in relation to `input`.
-//      This gives us an almost 4x speed-up.
-//
-//    - In many cases, we don't need to match individual tokens;
-//      for example, if a value doesn't hold any variables, operations
-//      or dynamic references, the parser can effectively 'skip' it,
-//      treating it as a literal.
-//      An example would be '1px solid #000' - which evaluates to itself,
-//      we don't need to know what the individual components are.
-//      The drawback, of course is that you don't get the benefits of
-//      syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
-//      and a smaller speed-up in the code-gen.
-//
-//
-//    Token matching is done with the `$` function, which either takes
-//    a terminal string or regexp, or a non-terminal function to call.
-//    It also takes care of moving all the indices forwards.
-//
-//
-less.Parser = function Parser(env) {
-    var input,       // LeSS input string
-        i,           // current index in `input`
-        j,           // current chunk
-        saveStack = [],   // holds state for backtracking
-        furthest,    // furthest index the parser has gone to
-        chunks,      // chunkified input
-        current,     // current chunk
-        currentPos,  // index of current chunk, in `input`
-        parser,
-        parsers,
-        rootFilename = env && env.filename;
-
-    // Top parser on an import tree must be sure there is one "env"
-    // which will then be passed around by reference.
-    if (!(env instanceof tree.parseEnv)) {
-        env = new tree.parseEnv(env);
-    }
-
-    var imports = this.imports = {
-        paths: env.paths || [],  // Search paths, when importing
-        queue: [],               // Files which haven't been imported yet
-        files: env.files,        // Holds the imported parse trees
-        contents: env.contents,  // Holds the imported file contents
-        contentsIgnoredChars: env.contentsIgnoredChars, // lines inserted, not in the original less
-        mime:  env.mime,         // MIME type of .less files
-        error: null,             // Error in parsing/evaluating an import
-        push: function (path, currentFileInfo, importOptions, callback) {
-            var parserImports = this;
-            this.queue.push(path);
-
-            var fileParsedFunc = function (e, root, fullPath) {
-                parserImports.queue.splice(parserImports.queue.indexOf(path), 1); // Remove the path from the queue
-
-                var importedPreviously = fullPath === rootFilename;
-
-                parserImports.files[fullPath] = root;                        // Store the root
-
-                if (e && !parserImports.error) { parserImports.error = e; }
-
-                callback(e, root, importedPreviously, fullPath);
-            };
-
-            if (less.Parser.importer) {
-                less.Parser.importer(path, currentFileInfo, fileParsedFunc, env);
-            } else {
-                less.Parser.fileLoader(path, currentFileInfo, function(e, contents, fullPath, newFileInfo) {
-                    if (e) {fileParsedFunc(e); return;}
-
-                    var newEnv = new tree.parseEnv(env);
-
-                    newEnv.currentFileInfo = newFileInfo;
-                    newEnv.processImports = false;
-                    newEnv.contents[fullPath] = contents;
-
-                    if (currentFileInfo.reference || importOptions.reference) {
-                        newFileInfo.reference = true;
-                    }
-
-                    if (importOptions.inline) {
-                        fileParsedFunc(null, contents, fullPath);
-                    } else {
-                        new(less.Parser)(newEnv).parse(contents, function (e, root) {
-                            fileParsedFunc(e, root, fullPath);
-                        });
-                    }
-                }, env);
-            }
-        }
-    };
-
-    function save()    { currentPos = i; saveStack.push( { current: current, i: i, j: j }); }
-    function restore() { var state = saveStack.pop(); current = state.current; currentPos = i = state.i; j = state.j; }
-    function forget() { saveStack.pop(); }
-
-    function sync() {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-    }
-    function isWhitespace(str, pos) {
-        var code = str.charCodeAt(pos | 0);
-        return (code <= 32) && (code === 32 || code === 10 || code === 9);
-    }
-    //
-    // Parse from a token, regexp or string, and move forward if match
-    //
-    function $(tok) {
-        var tokType = typeof tok,
-            match, length;
-
-        // Either match a single character in the input,
-        // or match a regexp in the current chunk (`current`).
-        //
-        if (tokType === "string") {
-            if (input.charAt(i) !== tok) {
-                return null;
-            }
-            skipWhitespace(1);
-            return tok;
-        }
-
-        // regexp
-        sync ();
-        if (! (match = tok.exec(current))) {
-            return null;
-        }
-
-        length = match[0].length;
-
-        // The match is confirmed, add the match length to `i`,
-        // and consume any extra white-space characters (' ' || '\n')
-        // which come after that. The reason for this is that LeSS's
-        // grammar is mostly white-space insensitive.
-        //
-        skipWhitespace(length);
-
-        if(typeof(match) === 'string') {
-            return match;
-        } else {
-            return match.length === 1 ? match[0] : match;
-        }
-    }
-
-    // Specialization of $(tok)
-    function $re(tok) {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-        var m = tok.exec(current);
-        if (!m) {
-            return null;
-        }
-
-        skipWhitespace(m[0].length);
-        if(typeof m === "string") {
-            return m;
-        }
-
-        return m.length === 1 ? m[0] : m;
-    }
-
-    var _$re = $re;
-
-    // Specialization of $(tok)
-    function $char(tok) {
-        if (input.charAt(i) !== tok) {
-            return null;
-        }
-        skipWhitespace(1);
-        return tok;
-    }
-
-    function skipWhitespace(length) {
-        var oldi = i, oldj = j,
-            curr = i - currentPos,
-            endIndex = i + current.length - curr,
-            mem = (i += length),
-            inp = input,
-            c;
-
-        for (; i < endIndex; i++) {
-            c = inp.charCodeAt(i);
-            if (c > 32) {
-                break;
-            }
-
-            if ((c !== 32) && (c !== 10) && (c !== 9) && (c !== 13)) {
-                break;
-            }
-         }
-
-        current = current.slice(length + i - mem + curr);
-        currentPos = i;
-
-        if (!current.length && (j < chunks.length - 1)) {
-            current = chunks[++j];
-            skipWhitespace(0); // skip space at the beginning of a chunk
-            return true; // things changed
-        }
-
-        return oldi !== i || oldj !== j;
-    }
-
-    function expect(arg, msg) {
-        // some older browsers return typeof 'function' for RegExp
-        var result = (Object.prototype.toString.call(arg) === '[object Function]') ? arg.call(parsers) : $(arg);
-        if (result) {
-            return result;
-        }
-        error(msg || (typeof(arg) === 'string' ? "expected '" + arg + "' got '" + input.charAt(i) + "'"
-                                               : "unexpected token"));
-    }
-
-    // Specialization of expect()
-    function expectChar(arg, msg) {
-        if (input.charAt(i) === arg) {
-            skipWhitespace(1);
-            return arg;
-        }
-        error(msg || "expected '" + arg + "' got '" + input.charAt(i) + "'");
-    }
-
-    function error(msg, type) {
-        var e = new Error(msg);
-        e.index = i;
-        e.type = type || 'Syntax';
-        throw e;
-    }
-
-    // Same as $(), but don't change the state of the parser,
-    // just return the match.
-    function peek(tok) {
-        if (typeof(tok) === 'string') {
-            return input.charAt(i) === tok;
-        } else {
-            return tok.test(current);
-        }
-    }
-
-    // Specialization of peek()
-    function peekChar(tok) {
-        return input.charAt(i) === tok;
-    }
-
-
-    function getInput(e, env) {
-        if (e.filename && env.currentFileInfo.filename && (e.filename !== env.currentFileInfo.filename)) {
-            return parser.imports.contents[e.filename];
-        } else {
-            return input;
-        }
-    }
-
-    function getLocation(index, inputStream) {
-        var n = index + 1,
-            line = null,
-            column = -1;
-
-        while (--n >= 0 && inputStream.charAt(n) !== '\n') {
-            column++;
-        }
-
-        if (typeof index === 'number') {
-            line = (inputStream.slice(0, index).match(/\n/g) || "").length;
-        }
-
-        return {
-            line: line,
-            column: column
-        };
-    }
-
-    function getDebugInfo(index, inputStream, env) {
-        var filename = env.currentFileInfo.filename;
-        if(less.mode !== 'browser' && less.mode !== 'rhino') {
-            filename = require('path').resolve(filename);
-        }
-
-        return {
-            lineNumber: getLocation(index, inputStream).line + 1,
-            fileName: filename
-        };
-    }
-
-    function LessError(e, env) {
-        var input = getInput(e, env),
-            loc = getLocation(e.index, input),
-            line = loc.line,
-            col  = loc.column,
-            callLine = e.call && getLocation(e.call, input).line,
-            lines = input.split('\n');
-
-        this.type = e.type || 'Syntax';
-        this.message = e.message;
-        this.filename = e.filename || env.currentFileInfo.filename;
-        this.index = e.index;
-        this.line = typeof(line) === 'number' ? line + 1 : null;
-        this.callLine = callLine + 1;
-        this.callExtract = lines[callLine];
-        this.stack = e.stack;
-        this.column = col;
-        this.extract = [
-            lines[line - 1],
-            lines[line],
-            lines[line + 1]
-        ];
-    }
-
-    LessError.prototype = new Error();
-    LessError.prototype.constructor = LessError;
-
-    this.env = env = env || {};
-
-    // The optimization level dictates the thoroughness of the parser,
-    // the lower the number, the less nodes it will create in the tree.
-    // This could matter for debugging, or if you want to access
-    // the individual nodes in the tree.
-    this.optimization = ('optimization' in this.env) ? this.env.optimization : 1;
-
-    //
-    // The Parser
-    //
-    parser = {
-
-        imports: imports,
-        //
-        // Parse an input string into an abstract syntax tree,
-        // @param str A string containing 'less' markup
-        // @param callback call `callback` when done.
-        // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply
-        //
-        parse: function (str, callback, additionalData) {
-            var root, line, lines, error = null, globalVars, modifyVars, preText = "";
-
-            i = j = currentPos = furthest = 0;
-
-            globalVars = (additionalData && additionalData.globalVars) ? less.Parser.serializeVars(additionalData.globalVars) + '\n' : '';
-            modifyVars = (additionalData && additionalData.modifyVars) ? '\n' + less.Parser.serializeVars(additionalData.modifyVars) : '';
-
-            if (globalVars || (additionalData && additionalData.banner)) {
-                preText = ((additionalData && additionalData.banner) ? additionalData.banner : "") + globalVars;
-                parser.imports.contentsIgnoredChars[env.currentFileInfo.filename] = preText.length;
-            }
-
-            str = str.replace(/\r\n/g, '\n');
-            // Remove potential UTF Byte Order Mark
-            input = str = preText + str.replace(/^\uFEFF/, '') + modifyVars;
-            parser.imports.contents[env.currentFileInfo.filename] = str;
-
-            // Split the input into chunks.
-            chunks = (function (input) {
-                var len = input.length, level = 0, parenLevel = 0,
-                    lastOpening, lastOpeningParen, lastMultiComment, lastMultiCommentEndBrace,
-                    chunks = [], emitFrom = 0,
-                    parserCurrentIndex, currentChunkStartIndex, cc, cc2, matched;
-
-                function fail(msg, index) {
-                    error = new(LessError)({
-                        index: index || parserCurrentIndex,
-                        type: 'Parse',
-                        message: msg,
-                        filename: env.currentFileInfo.filename
-                    }, env);
-                }
-
-                function emitChunk(force) {
-                    var len = parserCurrentIndex - emitFrom;
-                    if (((len < 512) && !force) || !len) {
-                        return;
-                    }
-                    chunks.push(input.slice(emitFrom, parserCurrentIndex + 1));
-                    emitFrom = parserCurrentIndex + 1;
-                }
-
-                for (parserCurrentIndex = 0; parserCurrentIndex < len; parserCurrentIndex++) {
-                    cc = input.charCodeAt(parserCurrentIndex);
-                    if (((cc >= 97) && (cc <= 122)) || (cc < 34)) {
-                        // a-z or whitespace
-                        continue;
-                    }
-
-                    switch (cc) {
-                        case 40:                        // (
-                            parenLevel++;
-                            lastOpeningParen = parserCurrentIndex;
-                            continue;
-                        case 41:                        // )
-                            if (--parenLevel < 0) {
-                                return fail("missing opening `(`");
-                            }
-                            continue;
-                        case 59:                        // ;
-                            if (!parenLevel) { emitChunk(); }
-                            continue;
-                        case 123:                       // {
-                            level++;
-                            lastOpening = parserCurrentIndex;
-                            continue;
-                        case 125:                       // }
-                            if (--level < 0) {
-                                return fail("missing opening `{`");
-                            }
-                            if (!level && !parenLevel) { emitChunk(); }
-                            continue;
-                        case 92:                        // \
-                            if (parserCurrentIndex < len - 1) { parserCurrentIndex++; continue; }
-                            return fail("unescaped `\\`");
-                        case 34:
-                        case 39:
-                        case 96:                        // ", ' and `
-                            matched = 0;
-                            currentChunkStartIndex = parserCurrentIndex;
-                            for (parserCurrentIndex = parserCurrentIndex + 1; parserCurrentIndex < len; parserCurrentIndex++) {
-                                cc2 = input.charCodeAt(parserCurrentIndex);
-                                if (cc2 > 96) { continue; }
-                                if (cc2 == cc) { matched = 1; break; }
-                                if (cc2 == 92) {        // \
-                                    if (parserCurrentIndex == len - 1) {
-                                        return fail("unescaped `\\`");
-                                    }
-                                    parserCurrentIndex++;
-                                }
-                            }
-                            if (matched) { continue; }
-                            return fail("unmatched `" + String.fromCharCode(cc) + "`", currentChunkStartIndex);
-                        case 47:                        // /, check for comment
-                            if (parenLevel || (parserCurrentIndex == len - 1)) { continue; }
-                            cc2 = input.charCodeAt(parserCurrentIndex + 1);
-                            if (cc2 == 47) {
-                                // //, find lnfeed
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if ((cc2 <= 13) && ((cc2 == 10) || (cc2 == 13))) { break; }
-                                }
-                            } else if (cc2 == 42) {
-                                // /*, find */
-                                lastMultiComment = currentChunkStartIndex = parserCurrentIndex;
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len - 1; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if (cc2 == 125) { lastMultiCommentEndBrace = parserCurrentIndex; }
-                                    if (cc2 != 42) { continue; }
-                                    if (input.charCodeAt(parserCurrentIndex + 1) == 47) { break; }
-                                }
-                                if (parserCurrentIndex == len - 1) {
-                                    return fail("missing closing `*/`", currentChunkStartIndex);
-                                }
-                                parserCurrentIndex++;
-                            }
-                            continue;
-                        case 42:                       // *, check for unmatched */
-                            if ((parserCurrentIndex < len - 1) && (input.charCodeAt(parserCurrentIndex + 1) == 47)) {
-                                return fail("unmatched `/*`");
-                            }
-                            continue;
-                    }
-                }
-
-                if (level !== 0) {
-                    if ((lastMultiComment > lastOpening) && (lastMultiCommentEndBrace > lastMultiComment)) {
-                        return fail("missing closing `}` or `*/`", lastOpening);
-                    } else {
-                        return fail("missing closing `}`", lastOpening);
-                    }
-                } else if (parenLevel !== 0) {
-                    return fail("missing closing `)`", lastOpeningParen);
-                }
-
-                emitChunk(true);
-                return chunks;
-            })(str);
-
-            if (error) {
-                return callback(new(LessError)(error, env));
-            }
-
-            current = chunks[0];
-
-            // Start with the primary rule.
-            // The whole syntax tree is held under a Ruleset node,
-            // with the `root` property set to true, so no `{}` are
-            // output. The callback is called when the input is parsed.
-            try {
-                root = new(tree.Ruleset)(null, this.parsers.primary());
-                root.root = true;
-                root.firstRoot = true;
-            } catch (e) {
-                return callback(new(LessError)(e, env));
-            }
-
-            root.toCSS = (function (evaluate) {
-                return function (options, variables) {
-                    options = options || {};
-                    var evaldRoot,
-                        css,
-                        evalEnv = new tree.evalEnv(options);
-
-                    //
-                    // Allows setting variables with a hash, so:
-                    //
-                    //   `{ color: new(tree.Color)('#f01') }` will become:
-                    //
-                    //   new(tree.Rule)('@color',
-                    //     new(tree.Value)([
-                    //       new(tree.Expression)([
-                    //         new(tree.Color)('#f01')
-                    //       ])
-                    //     ])
-                    //   )
-                    //
-                    if (typeof(variables) === 'object' && !Array.isArray(variables)) {
-                        variables = Object.keys(variables).map(function (k) {
-                            var value = variables[k];
-
-                            if (! (value instanceof tree.Value)) {
-                                if (! (value instanceof tree.Expression)) {
-                                    value = new(tree.Expression)([value]);
-                                }
-                                value = new(tree.Value)([value]);
-                            }
-                            return new(tree.Rule)('@' + k, value, false, null, 0);
-                        });
-                        evalEnv.frames = [new(tree.Ruleset)(null, variables)];
-                    }
-
-                    try {
-                        var preEvalVisitors = [],
-                            visitors = [
-                                new(tree.joinSelectorVisitor)(),
-                                new(tree.processExtendsVisitor)(),
-                                new(tree.toCSSVisitor)({compress: Boolean(options.compress)})
-                            ], i, root = this;
-
-                        if (options.plugins) {
-                            for(i =0; i < options.plugins.length; i++) {
-                                if (options.plugins[i].isPreEvalVisitor) {
-                                    preEvalVisitors.push(options.plugins[i]);
-                                } else {
-                                    if (options.plugins[i].isPreVisitor) {
-                                        visitors.splice(0, 0, options.plugins[i]);
-                                    } else {
-                                        visitors.push(options.plugins[i]);
-                                    }
-                                }
-                            }
-                        }
-
-                        for(i = 0; i < preEvalVisitors.length; i++) {
-                            preEvalVisitors[i].run(root);
-                        }
-
-                        evaldRoot = evaluate.call(root, evalEnv);
-
-                        for(i = 0; i < visitors.length; i++) {
-                            visitors[i].run(evaldRoot);
-                        }
-
-                        if (options.sourceMap) {
-                            evaldRoot = new tree.sourceMapOutput(
-                                {
-                                    contentsIgnoredCharsMap: parser.imports.contentsIgnoredChars,
-                                    writeSourceMap: options.writeSourceMap,
-                                    rootNode: evaldRoot,
-                                    contentsMap: parser.imports.contents,
-                                    sourceMapFilename: options.sourceMapFilename,
-                                    sourceMapURL: options.sourceMapURL,
-                                    outputFilename: options.sourceMapOutputFilename,
-                                    sourceMapBasepath: options.sourceMapBasepath,
-                                    sourceMapRootpath: options.sourceMapRootpath,
-                                    outputSourceFiles: options.outputSourceFiles,
-                                    sourceMapGenerator: options.sourceMapGenerator
-                                });
-                        }
-
-                        css = evaldRoot.toCSS({
-                                compress: Boolean(options.compress),
-                                dumpLineNumbers: env.dumpLineNumbers,
-                                strictUnits: Boolean(options.strictUnits),
-                                numPrecision: 8});
-                    } catch (e) {
-                        throw new(LessError)(e, env);
-                    }
-
-                    if (options.cleancss && less.mode === 'node') {
-                        var CleanCSS = require('clean-css'),
-                            cleancssOptions = options.cleancssOptions || {};
-
-                        if (cleancssOptions.keepSpecialComments === undefined) {
-                            cleancssOptions.keepSpecialComments = "*";
-                        }
-                        cleancssOptions.processImport = false;
-                        cleancssOptions.noRebase = true;
-                        if (cleancssOptions.noAdvanced === undefined) {
-                            cleancssOptions.noAdvanced = true;
-                        }
-
-                        return new CleanCSS(cleancssOptions).minify(css);
-                    } else if (options.compress) {
-                        return css.replace(/(^(\s)+)|((\s)+$)/g, "");
-                    } else {
-                        return css;
-                    }
-                };
-            })(root.eval);
-
-            // If `i` is smaller than the `input.length - 1`,
-            // it means the parser wasn't able to parse the whole
-            // string, so we've got a parsing error.
-            //
-            // We try to extract a \n delimited string,
-            // showing the line where the parse error occured.
-            // We split it up into two parts (the part which parsed,
-            // and the part which didn't), so we can color them differently.
-            if (i < input.length - 1) {
-                i = furthest;
-                var loc = getLocation(i, input);
-                lines = input.split('\n');
-                line = loc.line + 1;
-
-                error = {
-                    type: "Parse",
-                    message: "Unrecognised input",
-                    index: i,
-                    filename: env.currentFileInfo.filename,
-                    line: line,
-                    column: loc.column,
-                    extract: [
-                        lines[line - 2],
-                        lines[line - 1],
-                        lines[line]
-                    ]
-                };
-            }
-
-            var finish = function (e) {
-                e = error || e || parser.imports.error;
-
-                if (e) {
-                    if (!(e instanceof LessError)) {
-                        e = new(LessError)(e, env);
-                    }
-
-                    return callback(e);
-                }
-                else {
-                    return callback(null, root);
-                }
-            };
-
-            if (env.processImports !== false) {
-                new tree.importVisitor(this.imports, finish)
-                    .run(root);
-            } else {
-                return finish();
-            }
-        },
-
-        //
-        // Here in, the parsing rules/functions
-        //
-        // The basic structure of the syntax tree generated is as follows:
-        //
-        //   Ruleset ->  Rule -> Value -> Expression -> Entity
-        //
-        // Here's some Less code:
-        //
-        //    .class {
-        //      color: #fff;
-        //      border: 1px solid #000;
-        //      width: @w + 4px;
-        //      > .child {...}
-        //    }
-        //
-        // And here's what the parse tree might look like:
-        //
-        //     Ruleset (Selector '.class', [
-        //         Rule ("color",  Value ([Expression [Color #fff]]))
-        //         Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
-        //         Rule ("width",  Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
-        //         Ruleset (Selector [Element '>', '.child'], [...])
-        //     ])
-        //
-        //  In general, most rules will try to parse a token with the `$()` function, and if the return
-        //  value is truly, will return a new node, of the relevant type. Sometimes, we need to check
-        //  first, before parsing, that's when we use `peek()`.
-        //
-        parsers: parsers = {
-            //
-            // The `primary` rule is the *entry* and *exit* point of the parser.
-            // The rules here can appear at any level of the parse tree.
-            //
-            // The recursive nature of the grammar is an interplay between the `block`
-            // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
-            // as represented by this simplified grammar:
-            //
-            //     primary  →  (ruleset | rule)+
-            //     ruleset  →  selector+ block
-            //     block    →  '{' primary '}'
-            //
-            // Only at one point is the primary rule not called from the
-            // block rule: at the root level.
-            //
-            primary: function () {
-                var mixin = this.mixin, $re = _$re, root = [], node;
-
-                while (current)
-                {
-                    node = this.extendRule() || mixin.definition() || this.rule() || this.ruleset() ||
-                        mixin.call() || this.comment() || this.rulesetCall() || this.directive();
-                    if (node) {
-                        root.push(node);
-                    } else {
-                        if (!($re(/^[\s\n]+/) || $re(/^;+/))) {
-                            break;
-                        }
-                    }
-                    if (peekChar('}')) {
-                        break;
-                    }
-                }
-
-                return root;
-            },
-
-            // We create a Comment node for CSS comments `/* */`,
-            // but keep the LeSS comments `//` silent, by just skipping
-            // over them.
-            comment: function () {
-                var comment;
-
-                if (input.charAt(i) !== '/') { return; }
-
-                if (input.charAt(i + 1) === '/') {
-                    return new(tree.Comment)($re(/^\/\/.*/), true, i, env.currentFileInfo);
-                }
-                comment = $re(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/);
-                if (comment) {
-                    return new(tree.Comment)(comment, false, i, env.currentFileInfo);
-                }
-            },
-
-            comments: function () {
-                var comment, comments = [];
-
-                while(true) {
-                    comment = this.comment();
-                    if (!comment) {
-                        break;
-                    }
-                    comments.push(comment);
-                }
-
-                return comments;
-            },
-
-            //
-            // Entities are tokens which can be found inside an Expression
-            //
-            entities: {
-                //
-                // A string, which supports escaping " and '
-                //
-                //     "milky way" 'he\'s the one!'
-                //
-                quoted: function () {
-                    var str, j = i, e, index = i;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '"' && input.charAt(j) !== "'") { return; }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/);
-                    if (str) {
-                        return new(tree.Quoted)(str[0], str[1] || str[2], e, index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A catch-all word, such as:
-                //
-                //     black border-collapse
-                //
-                keyword: function () {
-                    var k;
-
-                    k = $re(/^%|^[_A-Za-z-][_A-Za-z0-9-]*/);
-                    if (k) {
-                        var color = tree.Color.fromKeyword(k);
-                        if (color) {
-                            return color;
-                        }
-                        return new(tree.Keyword)(k);
-                    }
-                },
-
-                //
-                // A function call
-                //
-                //     rgb(255, 0, 255)
-                //
-                // We also try to catch IE's `alpha()`, but let the `alpha` parser
-                // deal with the details.
-                //
-                // The arguments are parsed with the `entities.arguments` parser.
-                //
-                call: function () {
-                    var name, nameLC, args, alpha_ret, index = i;
-
-                    name = /^([\w-]+|%|progid:[\w\.]+)\(/.exec(current);
-                    if (!name) { return; }
-
-                    name = name[1];
-                    nameLC = name.toLowerCase();
-                    if (nameLC === 'url') {
-                        return null;
-                    }
-
-                    i += name.length;
-
-                    if (nameLC === 'alpha') {
-                        alpha_ret = parsers.alpha();
-                        if(typeof alpha_ret !== 'undefined') {
-                            return alpha_ret;
-                        }
-                    }
-
-                    $char('('); // Parse the '(' and consume whitespace.
-
-                    args = this.arguments();
-
-                    if (! $char(')')) {
-                        return;
-                    }
-
-                    if (name) { return new(tree.Call)(name, args, index, env.currentFileInfo); }
-                },
-                arguments: function () {
-                    var args = [], arg;
-
-                    while (true) {
-                        arg = this.assignment() || parsers.expression();
-                        if (!arg) {
-                            break;
-                        }
-                        args.push(arg);
-                        if (! $char(',')) {
-                            break;
-                        }
-                    }
-                    return args;
-                },
-                literal: function () {
-                    return this.dimension() ||
-                           this.color() ||
-                           this.quoted() ||
-                           this.unicodeDescriptor();
-                },
-
-                // Assignments are argument entities for calls.
-                // They are present in ie filter properties as shown below.
-                //
-                //     filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
-                //
-
-                assignment: function () {
-                    var key, value;
-                    key = $re(/^\w+(?=\s?=)/i);
-                    if (!key) {
-                        return;
-                    }
-                    if (!$char('=')) {
-                        return;
-                    }
-                    value = parsers.entity();
-                    if (value) {
-                        return new(tree.Assignment)(key, value);
-                    }
-                },
-
-                //
-                // Parse url() tokens
-                //
-                // We use a specific rule for urls, because they don't really behave like
-                // standard function calls. The difference is that the argument doesn't have
-                // to be enclosed within a string, so it can't be parsed as an Expression.
-                //
-                url: function () {
-                    var value;
-
-                    if (input.charAt(i) !== 'u' || !$re(/^url\(/)) {
-                        return;
-                    }
-
-                    value = this.quoted() || this.variable() ||
-                            $re(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) || "";
-
-                    expectChar(')');
-
-                    return new(tree.URL)((value.value != null || value instanceof tree.Variable)
-                                        ? value : new(tree.Anonymous)(value), env.currentFileInfo);
-                },
-
-                //
-                // A Variable entity, such as `@fink`, in
-                //
-                //     width: @fink + 2px
-                //
-                // We use a different parser for variable definitions,
-                // see `parsers.variable`.
-                //
-                variable: function () {
-                    var name, index = i;
-
-                    if (input.charAt(i) === '@' && (name = $re(/^@@?[\w-]+/))) {
-                        return new(tree.Variable)(name, index, env.currentFileInfo);
-                    }
-                },
-
-                // A variable entity useing the protective {} e.g. @{var}
-                variableCurly: function () {
-                    var curly, index = i;
-
-                    if (input.charAt(i) === '@' && (curly = $re(/^@\{([\w-]+)\}/))) {
-                        return new(tree.Variable)("@" + curly[1], index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A Hexadecimal color
-                //
-                //     #4F3C2F
-                //
-                // `rgb` and `hsl` colors are parsed through the `entities.call` parser.
-                //
-                color: function () {
-                    var rgb;
-
-                    if (input.charAt(i) === '#' && (rgb = $re(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/))) {
-                        var colorCandidateString = rgb.input.match(/^#([\w]+).*/); // strip colons, brackets, whitespaces and other characters that should not definitely be part of color string
-                        colorCandidateString = colorCandidateString[1];
-                        if (!colorCandidateString.match(/^[A-Fa-f0-9]+$/)) { // verify if candidate consists only of allowed HEX characters
-                            error("Invalid HEX color code");
-                        }
-                        return new(tree.Color)(rgb[1]);
-                    }
-                },
-
-                //
-                // A Dimension, that is, a number and a unit
-                //
-                //     0.5em 95%
-                //
-                dimension: function () {
-                    var value, c = input.charCodeAt(i);
-                    //Is the first char of the dimension 0-9, '.', '+' or '-'
-                    if ((c > 57 || c < 43) || c === 47 || c == 44) {
-                        return;
-                    }
-
-                    value = $re(/^([+-]?\d*\.?\d+)(%|[a-z]+)?/);
-                    if (value) {
-                        return new(tree.Dimension)(value[1], value[2]);
-                    }
-                },
-
-                //
-                // A unicode descriptor, as is used in unicode-range
-                //
-                // U+0??  or U+00A1-00A9
-                //
-                unicodeDescriptor: function () {
-                    var ud;
-
-                    ud = $re(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/);
-                    if (ud) {
-                        return new(tree.UnicodeDescriptor)(ud[0]);
-                    }
-                },
-
-                //
-                // JavaScript code to be evaluated
-                //
-                //     `window.location.href`
-                //
-                javascript: function () {
-                    var str, j = i, e;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '`') { return; }
-                    if (env.javascriptEnabled !== undefined && !env.javascriptEnabled) {
-                        error("You are using JavaScript, which has been disabled.");
-                    }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^`([^`]*)`/);
-                    if (str) {
-                        return new(tree.JavaScript)(str[1], i, e);
-                    }
-                }
-            },
-
-            //
-            // The variable part of a variable definition. Used in the `rule` parser
-            //
-            //     @fink:
-            //
-            variable: function () {
-                var name;
-
-                if (input.charAt(i) === '@' && (name = $re(/^(@[\w-]+)\s*:/))) { return name[1]; }
-            },
-
-            //
-            // The variable part of a variable definition. Used in the `rule` parser
-            //
-            //     @fink();
-            //
-            rulesetCall: function () {
-                var name;
-
-                if (input.charAt(i) === '@' && (name = $re(/^(@[\w-]+)\s*\(\s*\)\s*;/))) {
-                    return new tree.RulesetCall(name[1]);
-                }
-            },
-
-            //
-            // extend syntax - used to extend selectors
-            //
-            extend: function(isRule) {
-                var elements, e, index = i, option, extendList, extend;
-
-                if (!(isRule ? $re(/^&:extend\(/) : $re(/^:extend\(/))) { return; }
-
-                do {
-                    option = null;
-                    elements = null;
-                    while (! (option = $re(/^(all)(?=\s*(\)|,))/))) {
-                        e = this.element();
-                        if (!e) { break; }
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                    }
-
-                    option = option && option[1];
-
-                    extend = new(tree.Extend)(new(tree.Selector)(elements), option, index);
-                    if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-
-                } while($char(","));
-
-                expect(/^\)/);
-
-                if (isRule) {
-                    expect(/^;/);
-                }
-
-                return extendList;
-            },
-
-            //
-            // extendRule - used in a rule to extend all the parent selectors
-            //
-            extendRule: function() {
-                return this.extend(true);
-            },
-
-            //
-            // Mixins
-            //
-            mixin: {
-                //
-                // A Mixin call, with an optional argument list
-                //
-                //     #mixins > .square(#fff);
-                //     .rounded(4px, black);
-                //     .button;
-                //
-                // The `while` loop is there because mixins can be
-                // namespaced, but we only support the child and descendant
-                // selector for now.
-                //
-                call: function () {
-                    var s = input.charAt(i), important = false, index = i, elemIndex,
-                        elements, elem, e, c, args;
-
-                    if (s !== '.' && s !== '#') { return; }
-
-                    save(); // stop us absorbing part of an invalid selector
-
-                    while (true) {
-                        elemIndex = i;
-                        e = $re(/^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/);
-                        if (!e) {
-                            break;
-                        }
-                        elem = new(tree.Element)(c, e, elemIndex, env.currentFileInfo);
-                        if (elements) { elements.push(elem); } else { elements = [ elem ]; }
-                        c = $char('>');
-                    }
-
-                    if (elements) {
-                        if ($char('(')) {
-                            args = this.args(true).args;
-                            expectChar(')');
-                        }
-
-                        if (parsers.important()) {
-                            important = true;
-                        }
-
-                        if (parsers.end()) {
-                            forget();
-                            return new(tree.mixin.Call)(elements, args, index, env.currentFileInfo, important);
-                        }
-                    }
-
-                    restore();
-                },
-                args: function (isCall) {
-                    var parsers = parser.parsers, entities = parsers.entities,
-                        returner = { args:null, variadic: false },
-                        expressions = [], argsSemiColon = [], argsComma = [],
-                        isSemiColonSeperated, expressionContainsNamed, name, nameLoop, value, arg;
-
-                    save();
-
-                    while (true) {
-                        if (isCall) {
-                            arg = parsers.detachedRuleset() || parsers.expression();
-                        } else {
-                            parsers.comments();
-                            if (input.charAt(i) === '.' && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ variadic: true });
-                                break;
-                            }
-                            arg = entities.variable() || entities.literal() || entities.keyword();
-                        }
-
-                        if (!arg) {
-                            break;
-                        }
-
-                        nameLoop = null;
-                        if (arg.throwAwayComments) {
-                            arg.throwAwayComments();
-                        }
-                        value = arg;
-                        var val = null;
-
-                        if (isCall) {
-                            // Variable
-                            if (arg.value && arg.value.length == 1) {
-                                val = arg.value[0];
-                            }
-                        } else {
-                            val = arg;
-                        }
-
-                        if (val && val instanceof tree.Variable) {
-                            if ($char(':')) {
-                                if (expressions.length > 0) {
-                                    if (isSemiColonSeperated) {
-                                        error("Cannot mix ; and , as delimiter types");
-                                    }
-                                    expressionContainsNamed = true;
-                                }
-
-                                // we do not support setting a ruleset as a default variable - it doesn't make sense
-                                // However if we do want to add it, there is nothing blocking it, just don't error
-                                // and remove isCall dependency below
-                                value = (isCall && parsers.detachedRuleset()) || parsers.expression();
-
-                                if (!value) {
-                                    if (isCall) {
-                                        error("could not understand value for named argument");
-                                    } else {
-                                        restore();
-                                        returner.args = [];
-                                        return returner;
-                                    }
-                                }
-                                nameLoop = (name = val.name);
-                            } else if (!isCall && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ name: arg.name, variadic: true });
-                                break;
-                            } else if (!isCall) {
-                                name = nameLoop = val.name;
-                                value = null;
-                            }
-                        }
-
-                        if (value) {
-                            expressions.push(value);
-                        }
-
-                        argsComma.push({ name:nameLoop, value:value });
-
-                        if ($char(',')) {
-                            continue;
-                        }
-
-                        if ($char(';') || isSemiColonSeperated) {
-
-                            if (expressionContainsNamed) {
-                                error("Cannot mix ; and , as delimiter types");
-                            }
-
-                            isSemiColonSeperated = true;
-
-                            if (expressions.length > 1) {
-                                value = new(tree.Value)(expressions);
-                            }
-                            argsSemiColon.push({ name:name, value:value });
-
-                            name = null;
-                            expressions = [];
-                            expressionContainsNamed = false;
-                        }
-                    }
-
-                    forget();
-                    returner.args = isSemiColonSeperated ? argsSemiColon : argsComma;
-                    return returner;
-                },
-                //
-                // A Mixin definition, with a list of parameters
-                //
-                //     .rounded (@radius: 2px, @color) {
-                //        ...
-                //     }
-                //
-                // Until we have a finer grained state-machine, we have to
-                // do a look-ahead, to make sure we don't have a mixin call.
-                // See the `rule` function for more information.
-                //
-                // We start by matching `.rounded (`, and then proceed on to
-                // the argument list, which has optional default values.
-                // We store the parameters in `params`, with a `value` key,
-                // if there is a value, such as in the case of `@radius`.
-                //
-                // Once we've got our params list, and a closing `)`, we parse
-                // the `{...}` block.
-                //
-                definition: function () {
-                    var name, params = [], match, ruleset, cond, variadic = false;
-                    if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
-                        peek(/^[^{]*\}/)) {
-                        return;
-                    }
-
-                    save();
-
-                    match = $re(/^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/);
-                    if (match) {
-                        name = match[1];
-
-                        var argInfo = this.args(false);
-                        params = argInfo.args;
-                        variadic = argInfo.variadic;
-
-                        // .mixincall("@{a}");
-                        // looks a bit like a mixin definition..
-                        // also
-                        // .mixincall(@a: {rule: set;});
-                        // so we have to be nice and restore
-                        if (!$char(')')) {
-                            furthest = i;
-                            restore();
-                            return;
-                        }
-
-                        parsers.comments();
-
-                        if ($re(/^when/)) { // Guard
-                            cond = expect(parsers.conditions, 'expected condition');
-                        }
-
-                        ruleset = parsers.block();
-
-                        if (ruleset) {
-                            forget();
-                            return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);
-                        } else {
-                            restore();
-                        }
-                    } else {
-                        forget();
-                    }
-                }
-            },
-
-            //
-            // Entities are the smallest recognized token,
-            // and can be found inside a rule's value.
-            //
-            entity: function () {
-                var entities = this.entities;
-
-                return entities.literal() || entities.variable() || entities.url() ||
-                       entities.call()    || entities.keyword()  || entities.javascript() ||
-                       this.comment();
-            },
-
-            //
-            // A Rule terminator. Note that we use `peek()` to check for '}',
-            // because the `block` rule will be expecting it, but we still need to make sure
-            // it's there, if ';' was ommitted.
-            //
-            end: function () {
-                return $char(';') || peekChar('}');
-            },
-
-            //
-            // IE's alpha function
-            //
-            //     alpha(opacity=88)
-            //
-            alpha: function () {
-                var value;
-
-                if (! $re(/^\(opacity=/i)) { return; }
-                value = $re(/^\d+/) || this.entities.variable();
-                if (value) {
-                    expectChar(')');
-                    return new(tree.Alpha)(value);
-                }
-            },
-
-            //
-            // A Selector Element
-            //
-            //     div
-            //     + h1
-            //     #socks
-            //     input[type="text"]
-            //
-            // Elements are the building blocks for Selectors,
-            // they are made out of a `Combinator` (see combinator rule),
-            // and an element name, such as a tag a class, or `*`.
-            //
-            element: function () {
-                var e, c, v, index = i;
-
-                c = this.combinator();
-
-                e = $re(/^(?:\d+\.\d+|\d+)%/) || $re(/^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||
-                    $char('*') || $char('&') || this.attribute() || $re(/^\([^()@]+\)/) || $re(/^[\.#](?=@)/) ||
-                    this.entities.variableCurly();
-
-                if (! e) {
-                    save();
-                    if ($char('(')) {
-                        if ((v = this.selector()) && $char(')')) {
-                            e = new(tree.Paren)(v);
-                            forget();
-                        } else {
-                            restore();
-                        }
-                    } else {
-                        forget();
-                    }
-                }
-
-                if (e) { return new(tree.Element)(c, e, index, env.currentFileInfo); }
-            },
-
-            //
-            // Combinators combine elements together, in a Selector.
-            //
-            // Because our parser isn't white-space sensitive, special care
-            // has to be taken, when parsing the descendant combinator, ` `,
-            // as it's an empty space. We have to check the previous character
-            // in the input, to see if it's a ` ` character. More info on how
-            // we deal with this in *combinator.js*.
-            //
-            combinator: function () {
-                var c = input.charAt(i);
-
-                if (c === '>' || c === '+' || c === '~' || c === '|' || c === '^') {
-                    i++;
-                    if (input.charAt(i) === '^') {
-                        c = '^^';
-                        i++;
-                    }
-                    while (isWhitespace(input, i)) { i++; }
-                    return new(tree.Combinator)(c);
-                } else if (isWhitespace(input, i - 1)) {
-                    return new(tree.Combinator)(" ");
-                } else {
-                    return new(tree.Combinator)(null);
-                }
-            },
-            //
-            // A CSS selector (see selector below)
-            // with less extensions e.g. the ability to extend and guard
-            //
-            lessSelector: function () {
-                return this.selector(true);
-            },
-            //
-            // A CSS Selector
-            //
-            //     .class > div + h1
-            //     li a:hover
-            //
-            // Selectors are made out of one or more Elements, see above.
-            //
-            selector: function (isLess) {
-                var index = i, $re = _$re, elements, extendList, c, e, extend, when, condition;
-
-                while ((isLess && (extend = this.extend())) || (isLess && (when = $re(/^when/))) || (e = this.element())) {
-                    if (when) {
-                        condition = expect(this.conditions, 'expected condition');
-                    } else if (condition) {
-                        error("CSS guard can only be used at the end of selector");
-                    } else if (extend) {
-                        if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-                    } else {
-                        if (extendList) { error("Extend can only be used at the end of selector"); }
-                        c = input.charAt(i);
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                        e = null;
-                    }
-                    if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') {
-                        break;
-                    }
-                }
-
-                if (elements) { return new(tree.Selector)(elements, extendList, condition, index, env.currentFileInfo); }
-                if (extendList) { error("Extend must be used to extend a selector, it cannot be used on its own"); }
-            },
-            attribute: function () {
-                if (! $char('[')) { return; }
-
-                var entities = this.entities,
-                    key, val, op;
-
-                if (!(key = entities.variableCurly())) {
-                    key = expect(/^(?:[_A-Za-z0-9-\*]*\|)?(?:[_A-Za-z0-9-]|\\.)+/);
-                }
-
-                op = $re(/^[|~*$^]?=/);
-                if (op) {
-                    val = entities.quoted() || $re(/^[0-9]+%/) || $re(/^[\w-]+/) || entities.variableCurly();
-                }
-
-                expectChar(']');
-
-                return new(tree.Attribute)(key, op, val);
-            },
-
-            //
-            // The `block` rule is used by `ruleset` and `mixin.definition`.
-            // It's a wrapper around the `primary` rule, with added `{}`.
-            //
-            block: function () {
-                var content;
-                if ($char('{') && (content = this.primary()) && $char('}')) {
-                    return content;
-                }
-            },
-
-            blockRuleset: function() {
-                var block = this.block();
-
-                if (block) {
-                    block = new tree.Ruleset(null, block);
-                }
-                return block;
-            },
-
-            detachedRuleset: function() {
-                var blockRuleset = this.blockRuleset();
-                if (blockRuleset) {
-                    return new tree.DetachedRuleset(blockRuleset);
-                }
-            },
-
-            //
-            // div, .class, body > p {...}
-            //
-            ruleset: function () {
-                var selectors, s, rules, debugInfo;
-
-                save();
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                while (true) {
-                    s = this.lessSelector();
-                    if (!s) {
-                        break;
-                    }
-                    if (selectors) { selectors.push(s); } else { selectors = [ s ]; }
-                    this.comments();
-                    if (s.condition && selectors.length > 1) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    if (! $char(',')) { break; }
-                    if (s.condition) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    this.comments();
-                }
-
-                if (selectors && (rules = this.block())) {
-                    forget();
-                    var ruleset = new(tree.Ruleset)(selectors, rules, env.strictImports);
-                    if (env.dumpLineNumbers) {
-                        ruleset.debugInfo = debugInfo;
-                    }
-                    return ruleset;
-                } else {
-                    // Backtrack
-                    furthest = i;
-                    restore();
-                }
-            },
-            rule: function (tryAnonymous) {
-                var name, value, startOfRule = i, c = input.charAt(startOfRule), important, merge, isVariable;
-
-                if (c === '.' || c === '#' || c === '&') { return; }
-
-                save();
-
-                name = this.variable() || this.ruleProperty();
-                if (name) {
-                    isVariable = typeof name === "string";
-
-                    if (isVariable) {
-                        value = this.detachedRuleset();
-                    }
-
-                    if (!value) {
-                        // prefer to try to parse first if its a variable or we are compressing
-                        // but always fallback on the other one
-                        value = !tryAnonymous && (env.compress || isVariable) ?
-                            (this.value() || this.anonymousValue()) :
-                            (this.anonymousValue() || this.value());
-
-                        important = this.important();
-
-                        // a name returned by this.ruleProperty() is always an array of the form:
-                        // [string-1, ..., string-n, ""] or [string-1, ..., string-n, "+"]
-                        // where each item is a tree.Keyword or tree.Variable
-                        merge = !isVariable && name.pop().value;
-                    }
-
-                    if (value && this.end()) {
-                        forget();
-                        return new (tree.Rule)(name, value, important, merge, startOfRule, env.currentFileInfo);
-                    } else {
-                        furthest = i;
-                        restore();
-                        if (value && !tryAnonymous) {
-                            return this.rule(true);
-                        }
-                    }
-                } else {
-                    forget();
-                }
-            },
-            anonymousValue: function () {
-                var match;
-                match = /^([^@+\/'"*`(;{}-]*);/.exec(current);
-                if (match) {
-                    i += match[0].length - 1;
-                    return new(tree.Anonymous)(match[1]);
-                }
-            },
-
-            //
-            // An @import directive
-            //
-            //     @import "lib";
-            //
-            // Depending on our environemnt, importing is done differently:
-            // In the browser, it's an XHR request, in Node, it would be a
-            // file-system operation. The function used for importing is
-            // stored in `import`, which we pass to the Import constructor.
-            //
-            "import": function () {
-                var path, features, index = i;
-
-                save();
-
-                var dir = $re(/^@import?\s+/);
-
-                var options = (dir ? this.importOptions() : null) || {};
-
-                if (dir && (path = this.entities.quoted() || this.entities.url())) {
-                    features = this.mediaFeatures();
-                    if ($char(';')) {
-                        forget();
-                        features = features && new(tree.Value)(features);
-                        return new(tree.Import)(path, features, options, index, env.currentFileInfo);
-                    }
-                }
-
-                restore();
-            },
-
-            importOptions: function() {
-                var o, options = {}, optionName, value;
-
-                // list of options, surrounded by parens
-                if (! $char('(')) { return null; }
-                do {
-                    o = this.importOption();
-                    if (o) {
-                        optionName = o;
-                        value = true;
-                        switch(optionName) {
-                            case "css":
-                                optionName = "less";
-                                value = false;
-                            break;
-                            case "once":
-                                optionName = "multiple";
-                                value = false;
-                            break;
-                        }
-                        options[optionName] = value;
-                        if (! $char(',')) { break; }
-                    }
-                } while (o);
-                expectChar(')');
-                return options;
-            },
-
-            importOption: function() {
-                var opt = $re(/^(less|css|multiple|once|inline|reference)/);
-                if (opt) {
-                    return opt[1];
-                }
-            },
-
-            mediaFeature: function () {
-                var entities = this.entities, nodes = [], e, p;
-                do {
-                    e = entities.keyword() || entities.variable();
-                    if (e) {
-                        nodes.push(e);
-                    } else if ($char('(')) {
-                        p = this.property();
-                        e = this.value();
-                        if ($char(')')) {
-                            if (p && e) {
-                                nodes.push(new(tree.Paren)(new(tree.Rule)(p, e, null, null, i, env.currentFileInfo, true)));
-                            } else if (e) {
-                                nodes.push(new(tree.Paren)(e));
-                            } else {
-                                return null;
-                            }
-                        } else { return null; }
-                    }
-                } while (e);
-
-                if (nodes.length > 0) {
-                    return new(tree.Expression)(nodes);
-                }
-            },
-
-            mediaFeatures: function () {
-                var entities = this.entities, features = [], e;
-                do {
-                    e = this.mediaFeature();
-                    if (e) {
-                        features.push(e);
-                        if (! $char(',')) { break; }
-                    } else {
-                        e = entities.variable();
-                        if (e) {
-                            features.push(e);
-                            if (! $char(',')) { break; }
-                        }
-                    }
-                } while (e);
-
-                return features.length > 0 ? features : null;
-            },
-
-            media: function () {
-                var features, rules, media, debugInfo;
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                if ($re(/^@media/)) {
-                    features = this.mediaFeatures();
-
-                    rules = this.block();
-                    if (rules) {
-                        media = new(tree.Media)(rules, features, i, env.currentFileInfo);
-                        if (env.dumpLineNumbers) {
-                            media.debugInfo = debugInfo;
-                        }
-                        return media;
-                    }
-                }
-            },
-
-            //
-            // A CSS Directive
-            //
-            //     @charset "utf-8";
-            //
-            directive: function () {
-                var index = i, name, value, rules, nonVendorSpecificName,
-                    hasIdentifier, hasExpression, hasUnknown, hasBlock = true;
-
-                if (input.charAt(i) !== '@') { return; }
-
-                value = this['import']() || this.media();
-                if (value) {
-                    return value;
-                }
-
-                save();
-
-                name = $re(/^@[a-z-]+/);
-
-                if (!name) { return; }
-
-                nonVendorSpecificName = name;
-                if (name.charAt(1) == '-' && name.indexOf('-', 2) > 0) {
-                    nonVendorSpecificName = "@" + name.slice(name.indexOf('-', 2) + 1);
-                }
-
-                switch(nonVendorSpecificName) {
-                    /*
-                    case "@font-face":
-                    case "@viewport":
-                    case "@top-left":
-                    case "@top-left-corner":
-                    case "@top-center":
-                    case "@top-right":
-                    case "@top-right-corner":
-                    case "@bottom-left":
-                    case "@bottom-left-corner":
-                    case "@bottom-center":
-                    case "@bottom-right":
-                    case "@bottom-right-corner":
-                    case "@left-top":
-                    case "@left-middle":
-                    case "@left-bottom":
-                    case "@right-top":
-                    case "@right-middle":
-                    case "@right-bottom":
-                        hasBlock = true;
-                        break;
-                    */
-                    case "@charset":
-                        hasIdentifier = true;
-                        hasBlock = false;
-                        break;
-                    case "@namespace":
-                        hasExpression = true;
-                        hasBlock = false;
-                        break;
-                    case "@keyframes":
-                        hasIdentifier = true;
-                        break;
-                    case "@host":
-                    case "@page":
-                    case "@document":
-                    case "@supports":
-                        hasUnknown = true;
-                        break;
-                }
-
-                if (hasIdentifier) {
-                    value = this.entity();
-                    if (!value) {
-                        error("expected " + name + " identifier");
-                    }
-                } else if (hasExpression) {
-                    value = this.expression();
-                    if (!value) {
-                        error("expected " + name + " expression");
-                    }
-                } else if (hasUnknown) {
-                    value = ($re(/^[^{;]+/) || '').trim();
-                    if (value) {
-                        value = new(tree.Anonymous)(value);
-                    }
-                }
-
-                if (hasBlock) {
-                    rules = this.blockRuleset();
-                }
-
-                if (rules || (!hasBlock && value && $char(';'))) {
-                    forget();
-                    return new(tree.Directive)(name, value, rules, index, env.currentFileInfo,
-                        env.dumpLineNumbers ? getDebugInfo(index, input, env) : null);
-                }
-
-                restore();
-            },
-
-            //
-            // A Value is a comma-delimited list of Expressions
-            //
-            //     font-family: Baskerville, Georgia, serif;
-            //
-            // In a Rule, a Value represents everything after the `:`,
-            // and before the `;`.
-            //
-            value: function () {
-                var e, expressions = [];
-
-                do {
-                    e = this.expression();
-                    if (e) {
-                        expressions.push(e);
-                        if (! $char(',')) { break; }
-                    }
-                } while(e);
-
-                if (expressions.length > 0) {
-                    return new(tree.Value)(expressions);
-                }
-            },
-            important: function () {
-                if (input.charAt(i) === '!') {
-                    return $re(/^! *important/);
-                }
-            },
-            sub: function () {
-                var a, e;
-
-                if ($char('(')) {
-                    a = this.addition();
-                    if (a) {
-                        e = new(tree.Expression)([a]);
-                        expectChar(')');
-                        e.parens = true;
-                        return e;
-                    }
-                }
-            },
-            multiplication: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.operand();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        if (peek(/^\/[*\/]/)) {
-                            break;
-                        }
-                        op = $char('/') || $char('*');
-
-                        if (!op) { break; }
-
-                        a = this.operand();
-
-                        if (!a) { break; }
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            addition: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.multiplication();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        op = $re(/^[-+]\s+/) || (!isSpaced && ($char('+') || $char('-')));
-                        if (!op) {
-                            break;
-                        }
-                        a = this.multiplication();
-                        if (!a) {
-                            break;
-                        }
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            conditions: function () {
-                var a, b, index = i, condition;
-
-                a = this.condition();
-                if (a) {
-                    while (true) {
-                        if (!peek(/^,\s*(not\s*)?\(/) || !$char(',')) {
-                            break;
-                        }
-                        b = this.condition();
-                        if (!b) {
-                            break;
-                        }
-                        condition = new(tree.Condition)('or', condition || a, b, index);
-                    }
-                    return condition || a;
-                }
-            },
-            condition: function () {
-                var entities = this.entities, index = i, negate = false,
-                    a, b, c, op;
-
-                if ($re(/^not/)) { negate = true; }
-                expectChar('(');
-                a = this.addition() || entities.keyword() || entities.quoted();
-                if (a) {
-                    op = $re(/^(?:>=|<=|=<|[<=>])/);
-                    if (op) {
-                        b = this.addition() || entities.keyword() || entities.quoted();
-                        if (b) {
-                            c = new(tree.Condition)(op, a, b, index, negate);
-                        } else {
-                            error('expected expression');
-                        }
-                    } else {
-                        c = new(tree.Condition)('=', a, new(tree.Keyword)('true'), index, negate);
-                    }
-                    expectChar(')');
-                    return $re(/^and/) ? new(tree.Condition)('and', c, this.condition()) : c;
-                }
-            },
-
-            //
-            // An operand is anything that can be part of an operation,
-            // such as a Color, or a Variable
-            //
-            operand: function () {
-                var entities = this.entities,
-                    p = input.charAt(i + 1), negate;
-
-                if (input.charAt(i) === '-' && (p === '@' || p === '(')) { negate = $char('-'); }
-                var o = this.sub() || entities.dimension() ||
-                        entities.color() || entities.variable() ||
-                        entities.call();
-
-                if (negate) {
-                    o.parensInOp = true;
-                    o = new(tree.Negative)(o);
-                }
-
-                return o;
-            },
-
-            //
-            // Expressions either represent mathematical operations,
-            // or white-space delimited Entities.
-            //
-            //     1px solid black
-            //     @var * 2
-            //
-            expression: function () {
-                var entities = [], e, delim;
-
-                do {
-                    e = this.addition() || this.entity();
-                    if (e) {
-                        entities.push(e);
-                        // operations do not allow keyword "/" dimension (e.g. small/20px) so we support that here
-                        if (!peek(/^\/[\/*]/)) {
-                            delim = $char('/');
-                            if (delim) {
-                                entities.push(new(tree.Anonymous)(delim));
-                            }
-                        }
-                    }
-                } while (e);
-                if (entities.length > 0) {
-                    return new(tree.Expression)(entities);
-                }
-            },
-            property: function () {
-                var name = $re(/^(\*?-?[_a-zA-Z0-9-]+)\s*:/);
-                if (name) {
-                    return name[1];
-                }
-            },
-            ruleProperty: function () {
-                var c = current, name = [], index = [], length = 0, s, k;
-
-                function match(re) {
-                    var a = re.exec(c);
-                    if (a) {
-                        index.push(i + length);
-                        length += a[0].length;
-                        c = c.slice(a[1].length);
-                        return name.push(a[1]);
-                    }
-                }
-
-                match(/^(\*?)/);
-                while (match(/^((?:[\w-]+)|(?:@\{[\w-]+\}))/)); // !
-                if ((name.length > 1) && match(/^\s*((?:\+_|\+)?)\s*:/)) {
-                    // at last, we have the complete match now. move forward,
-                    // convert name particles to tree objects and return:
-                    skipWhitespace(length);
-                    if (name[0] === '') {
-                        name.shift();
-                        index.shift();
-                    }
-                    for (k = 0; k < name.length; k++) {
-                        s = name[k];
-                        name[k] = (s.charAt(0) !== '@')
-                            ? new(tree.Keyword)(s)
-                            : new(tree.Variable)('@' + s.slice(2, -1),
-                                index[k], env.currentFileInfo);
-                    }
-                    return name;
-                }
-            }
-        }
-    };
-    return parser;
-};
-less.Parser.serializeVars = function(vars) {
-    var s = '';
-
-    for (var name in vars) {
-        if (Object.hasOwnProperty.call(vars, name)) {
-            var value = vars[name];
-            s += ((name[0] === '@') ? '' : '@') + name +': '+ value +
-                    ((('' + value).slice(-1) === ';') ? '' : ';');
-        }
-    }
-
-    return s;
-};
-
-(function (tree) {
-
-tree.functions = {
-    rgb: function (r, g, b) {
-        return this.rgba(r, g, b, 1.0);
-    },
-    rgba: function (r, g, b, a) {
-        var rgb = [r, g, b].map(function (c) { return scaled(c, 255); });
-        a = number(a);
-        return new(tree.Color)(rgb, a);
-    },
-    hsl: function (h, s, l) {
-        return this.hsla(h, s, l, 1.0);
-    },
-    hsla: function (h, s, l, a) {
-        function hue(h) {
-            h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
-            if      (h * 6 < 1) { return m1 + (m2 - m1) * h * 6; }
-            else if (h * 2 < 1) { return m2; }
-            else if (h * 3 < 2) { return m1 + (m2 - m1) * (2/3 - h) * 6; }
-            else                { return m1; }
-        }
-
-        h = (number(h) % 360) / 360;
-        s = clamp(number(s)); l = clamp(number(l)); a = clamp(number(a));
-
-        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
-        var m1 = l * 2 - m2;
-
-        return this.rgba(hue(h + 1/3) * 255,
-                         hue(h)       * 255,
-                         hue(h - 1/3) * 255,
-                         a);
-    },
-
-    hsv: function(h, s, v) {
-        return this.hsva(h, s, v, 1.0);
-    },
-
-    hsva: function(h, s, v, a) {
-        h = ((number(h) % 360) / 360) * 360;
-        s = number(s); v = number(v); a = number(a);
-
-        var i, f;
-        i = Math.floor((h / 60) % 6);
-        f = (h / 60) - i;
-
-        var vs = [v,
-                  v * (1 - s),
-                  v * (1 - f * s),
-                  v * (1 - (1 - f) * s)];
-        var perm = [[0, 3, 1],
-                    [2, 0, 1],
-                    [1, 0, 3],
-                    [1, 2, 0],
-                    [3, 1, 0],
-                    [0, 1, 2]];
-
-        return this.rgba(vs[perm[i][0]] * 255,
-                         vs[perm[i][1]] * 255,
-                         vs[perm[i][2]] * 255,
-                         a);
-    },
-
-    hue: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().h));
-    },
-    saturation: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().s * 100), '%');
-    },
-    lightness: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSL().l * 100), '%');
-    },
-    hsvhue: function(color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().h));
-    },
-    hsvsaturation: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().s * 100), '%');
-    },
-    hsvvalue: function (color) {
-        return new(tree.Dimension)(Math.round(color.toHSV().v * 100), '%');
-    },
-    red: function (color) {
-        return new(tree.Dimension)(color.rgb[0]);
-    },
-    green: function (color) {
-        return new(tree.Dimension)(color.rgb[1]);
-    },
-    blue: function (color) {
-        return new(tree.Dimension)(color.rgb[2]);
-    },
-    alpha: function (color) {
-        return new(tree.Dimension)(color.toHSL().a);
-    },
-    luma: function (color) {
-        return new(tree.Dimension)(Math.round(color.luma() * color.alpha * 100), '%');
-    },
-    luminance: function (color) {
-        var luminance =
-            (0.2126 * color.rgb[0] / 255)
-          + (0.7152 * color.rgb[1] / 255)
-          + (0.0722 * color.rgb[2] / 255);
-
-        return new(tree.Dimension)(Math.round(luminance * color.alpha * 100), '%');
-    },
-    saturate: function (color, amount) {
-        // filter: saturate(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        var hsl = color.toHSL();
-
-        hsl.s += amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    desaturate: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.s -= amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    lighten: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l += amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    darken: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l -= amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    fadein: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a += amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fadeout: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a -= amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fade: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a = amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    spin: function (color, amount) {
-        var hsl = color.toHSL();
-        var hue = (hsl.h + amount.value) % 360;
-
-        hsl.h = hue < 0 ? 360 + hue : hue;
-
-        return hsla(hsl);
-    },
-    //
-    // Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
-    // http://sass-lang.com
-    //
-    mix: function (color1, color2, weight) {
-        if (!weight) {
-            weight = new(tree.Dimension)(50);
-        }
-        var p = weight.value / 100.0;
-        var w = p * 2 - 1;
-        var a = color1.toHSL().a - color2.toHSL().a;
-
-        var w1 = (((w * a == -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
-        var w2 = 1 - w1;
-
-        var rgb = [color1.rgb[0] * w1 + color2.rgb[0] * w2,
-                   color1.rgb[1] * w1 + color2.rgb[1] * w2,
-                   color1.rgb[2] * w1 + color2.rgb[2] * w2];
-
-        var alpha = color1.alpha * p + color2.alpha * (1 - p);
-
-        return new(tree.Color)(rgb, alpha);
-    },
-    greyscale: function (color) {
-        return this.desaturate(color, new(tree.Dimension)(100));
-    },
-    contrast: function (color, dark, light, threshold) {
-        // filter: contrast(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        if (typeof light === 'undefined') {
-            light = this.rgba(255, 255, 255, 1.0);
-        }
-        if (typeof dark === 'undefined') {
-            dark = this.rgba(0, 0, 0, 1.0);
-        }
-        //Figure out which is actually light and dark!
-        if (dark.luma() > light.luma()) {
-            var t = light;
-            light = dark;
-            dark = t;
-        }
-        if (typeof threshold === 'undefined') {
-            threshold = 0.43;
-        } else {
-            threshold = number(threshold);
-        }
-        if (color.luma() < threshold) {
-            return light;
-        } else {
-            return dark;
-        }
-    },
-    e: function (str) {
-        return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str.value);
-    },
-    escape: function (str) {
-        return new(tree.Anonymous)(encodeURI(str.value).replace(/=/g, "%3D").replace(/:/g, "%3A").replace(/#/g, "%23").replace(/;/g, "%3B").replace(/\(/g, "%28").replace(/\)/g, "%29"));
-    },
-    replace: function (string, pattern, replacement, flags) {
-        var result = string.value;
-
-        result = result.replace(new RegExp(pattern.value, flags ? flags.value : ''), replacement.value);
-        return new(tree.Quoted)(string.quote || '', result, string.escaped);
-    },
-    '%': function (string /* arg, arg, ...*/) {
-        var args = Array.prototype.slice.call(arguments, 1),
-            result = string.value;
-
-        for (var i = 0; i < args.length; i++) {
-            /*jshint loopfunc:true */
-            result = result.replace(/%[sda]/i, function(token) {
-                var value = token.match(/s/i) ? args[i].value : args[i].toCSS();
-                return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
-            });
-        }
-        result = result.replace(/%%/g, '%');
-        return new(tree.Quoted)(string.quote || '', result, string.escaped);
-    },
-    unit: function (val, unit) {
-        if(!(val instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "the first argument to unit must be a number" + (val instanceof tree.Operation ? ". Have you forgotten parenthesis?" : "") };
-        }
-        if (unit) {
-            if (unit instanceof tree.Keyword) {
-                unit = unit.value;
-            } else {
-                unit = unit.toCSS();
-            }
-        } else {
-            unit = "";
-        }
-        return new(tree.Dimension)(val.value, unit);
-    },
-    convert: function (val, unit) {
-        return val.convertTo(unit.value);
-    },
-    round: function (n, f) {
-        var fraction = typeof(f) === "undefined" ? 0 : f.value;
-        return _math(function(num) { return num.toFixed(fraction); }, null, n);
-    },
-    pi: function () {
-        return new(tree.Dimension)(Math.PI);
-    },
-    mod: function(a, b) {
-        return new(tree.Dimension)(a.value % b.value, a.unit);
-    },
-    pow: function(x, y) {
-        if (typeof x === "number" && typeof y === "number") {
-            x = new(tree.Dimension)(x);
-            y = new(tree.Dimension)(y);
-        } else if (!(x instanceof tree.Dimension) || !(y instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "arguments must be numbers" };
-        }
-
-        return new(tree.Dimension)(Math.pow(x.value, y.value), x.unit);
-    },
-    _minmax: function (isMin, args) {
-        args = Array.prototype.slice.call(args);
-        switch(args.length) {
-            case 0: throw { type: "Argument", message: "one or more arguments required" };
-        }
-        var i, j, current, currentUnified, referenceUnified, unit, unitStatic, unitClone,
-            order  = [], // elems only contains original argument values.
-            values = {}; // key is the unit.toString() for unified tree.Dimension values,
-                         // value is the index into the order array.
-        for (i = 0; i < args.length; i++) {
-            current = args[i];
-            if (!(current instanceof tree.Dimension)) {
-                if(Array.isArray(args[i].value)) {
-                    Array.prototype.push.apply(args, Array.prototype.slice.call(args[i].value));
-                }
-                continue;
-            }
-            currentUnified = current.unit.toString() === "" && unitClone !== undefined ? new(tree.Dimension)(current.value, unitClone).unify() : current.unify();
-            unit = currentUnified.unit.toString() === "" && unitStatic !== undefined ? unitStatic : currentUnified.unit.toString();
-            unitStatic = unit !== "" && unitStatic === undefined || unit !== "" && order[0].unify().unit.toString() === "" ? unit : unitStatic;
-            unitClone = unit !== "" && unitClone === undefined ? current.unit.toString() : unitClone;
-            j = values[""] !== undefined && unit !== "" && unit === unitStatic ? values[""] : values[unit];
-            if (j === undefined) {
-                if(unitStatic !== undefined && unit !== unitStatic) {
-                    throw{ type: "Argument", message: "incompatible types" };
-                }
-                values[unit] = order.length;
-                order.push(current);
-                continue;
-            }
-            referenceUnified = order[j].unit.toString() === "" && unitClone !== undefined ? new(tree.Dimension)(order[j].value, unitClone).unify() : order[j].unify();
-            if ( isMin && currentUnified.value < referenceUnified.value ||
-                !isMin && currentUnified.value > referenceUnified.value) {
-                order[j] = current;
-            }
-        }
-        if (order.length == 1) {
-            return order[0];
-        }
-        args = order.map(function (a) { return a.toCSS(this.env); }).join(this.env.compress ? "," : ", ");
-        return new(tree.Anonymous)((isMin ? "min" : "max") + "(" + args + ")");
-    },
-    min: function () {
-        return this._minmax(true, arguments);
-    },
-    max: function () {
-        return this._minmax(false, arguments);
-    },
-    "get-unit": function (n) {
-        return new(tree.Anonymous)(n.unit);
-    },
-    argb: function (color) {
-        return new(tree.Anonymous)(color.toARGB());
-    },
-    percentage: function (n) {
-        return new(tree.Dimension)(n.value * 100, '%');
-    },
-    color: function (n) {
-        if (n instanceof tree.Quoted) {
-            var colorCandidate = n.value,
-                returnColor;
-            returnColor = tree.Color.fromKeyword(colorCandidate);
-            if (returnColor) {
-                return returnColor;
-            }
-            if (/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/.test(colorCandidate)) {
-                return new(tree.Color)(colorCandidate.slice(1));
-            }
-            throw { type: "Argument", message: "argument must be a color keyword or 3/6 digit hex e.g. #FFF" };
-        } else {
-            throw { type: "Argument", message: "argument must be a string" };
-        }
-    },
-    iscolor: function (n) {
-        return this._isa(n, tree.Color);
-    },
-    isnumber: function (n) {
-        return this._isa(n, tree.Dimension);
-    },
-    isstring: function (n) {
-        return this._isa(n, tree.Quoted);
-    },
-    iskeyword: function (n) {
-        return this._isa(n, tree.Keyword);
-    },
-    isurl: function (n) {
-        return this._isa(n, tree.URL);
-    },
-    ispixel: function (n) {
-        return this.isunit(n, 'px');
-    },
-    ispercentage: function (n) {
-        return this.isunit(n, '%');
-    },
-    isem: function (n) {
-        return this.isunit(n, 'em');
-    },
-    isunit: function (n, unit) {
-        return (n instanceof tree.Dimension) && n.unit.is(unit.value || unit) ? tree.True : tree.False;
-    },
-    _isa: function (n, Type) {
-        return (n instanceof Type) ? tree.True : tree.False;
-    },
-    tint: function(color, amount) {
-        return this.mix(this.rgb(255,255,255), color, amount);
-    },
-    shade: function(color, amount) {
-        return this.mix(this.rgb(0, 0, 0), color, amount);
-    },
-    extract: function(values, index) {
-        index = index.value - 1; // (1-based index)
-        // handle non-array values as an array of length 1
-        // return 'undefined' if index is invalid
-        return Array.isArray(values.value)
-            ? values.value[index] : Array(values)[index];
-    },
-    length: function(values) {
-        var n = Array.isArray(values.value) ? values.value.length : 1;
-        return new tree.Dimension(n);
-    },
-
-    "data-uri": function(mimetypeNode, filePathNode) {
-
-        if (typeof window !== 'undefined') {
-            return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-        }
-
-        var mimetype = mimetypeNode.value;
-        var filePath = (filePathNode && filePathNode.value);
-
-        var fs = require('./fs'),
-            path = require('path'),
-            useBase64 = false;
-
-        if (arguments.length < 2) {
-            filePath = mimetype;
-        }
-
-        if (this.env.isPathRelative(filePath)) {
-            if (this.currentFileInfo.relativeUrls) {
-                filePath = path.join(this.currentFileInfo.currentDirectory, filePath);
-            } else {
-                filePath = path.join(this.currentFileInfo.entryPath, filePath);
-            }
-        }
-
-        // detect the mimetype if not given
-        if (arguments.length < 2) {
-            var mime;
-            try {
-                mime = require('mime');
-            } catch (ex) {
-                mime = tree._mime;
-            }
-
-            mimetype = mime.lookup(filePath);
-
-            // use base 64 unless it's an ASCII or UTF-8 format
-            var charset = mime.charsets.lookup(mimetype);
-            useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
-            if (useBase64) { mimetype += ';base64'; }
-        }
-        else {
-            useBase64 = /;base64$/.test(mimetype);
-        }
-
-        var buf = fs.readFileSync(filePath);
-
-        // IE8 cannot handle a data-uri larger than 32KB. If this is exceeded
-        // and the --ieCompat flag is enabled, return a normal url() instead.
-        var DATA_URI_MAX_KB = 32,
-            fileSizeInKB = parseInt((buf.length / 1024), 10);
-        if (fileSizeInKB >= DATA_URI_MAX_KB) {
-
-            if (this.env.ieCompat !== false) {
-                if (!this.env.silent) {
-                    console.warn("Skipped data-uri embedding of %s because its size (%dKB) exceeds IE8-safe %dKB!", filePath, fileSizeInKB, DATA_URI_MAX_KB);
-                }
-
-                return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-            }
-        }
-
-        buf = useBase64 ? buf.toString('base64')
-                        : encodeURIComponent(buf);
-
-        var uri = "\"data:" + mimetype + ',' + buf + "\"";
-        return new(tree.URL)(new(tree.Anonymous)(uri));
-    },
-
-    "svg-gradient": function(direction) {
-
-        function throwArgumentDescriptor() {
-            throw { type: "Argument", message: "svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position]" };
-        }
-
-        if (arguments.length < 3) {
-            throwArgumentDescriptor();
-        }
-        var stops = Array.prototype.slice.call(arguments, 1),
-            gradientDirectionSvg,
-            gradientType = "linear",
-            rectangleDimension = 'x="0" y="0" width="1" height="1"',
-            useBase64 = true,
-            renderEnv = {compress: false},
-            returner,
-            directionValue = direction.toCSS(renderEnv),
-            i, color, position, positionValue, alpha;
-
-        switch (directionValue) {
-            case "to bottom":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
-                break;
-            case "to right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
-                break;
-            case "to bottom right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
-                break;
-            case "to top right":
-                gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
-                break;
-            case "ellipse":
-            case "ellipse at center":
-                gradientType = "radial";
-                gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
-                rectangleDimension = 'x="-50" y="-50" width="101" height="101"';
-                break;
-            default:
-                throw { type: "Argument", message: "svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" };
-        }
-        returner = '<?xml version="1.0" ?>' +
-            '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' +
-            '<' + gradientType + 'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' + gradientDirectionSvg + '>';
-
-        for (i = 0; i < stops.length; i+= 1) {
-            if (stops[i].value) {
-                color = stops[i].value[0];
-                position = stops[i].value[1];
-            } else {
-                color = stops[i];
-                position = undefined;
-            }
-
-            if (!(color instanceof tree.Color) || (!((i === 0 || i+1 === stops.length) && position === undefined) && !(position instanceof tree.Dimension))) {
-                throwArgumentDescriptor();
-            }
-            positionValue = position ? position.toCSS(renderEnv) : i === 0 ? "0%" : "100%";
-            alpha = color.alpha;
-            returner += '<stop offset="' + positionValue + '" stop-color="' + color.toRGB() + '"' + (alpha < 1 ? ' stop-opacity="' + alpha + '"' : '') + '/>';
-        }
-        returner += '</' + gradientType + 'Gradient>' +
-                    '<rect ' + rectangleDimension + ' fill="url(#gradient)" /></svg>';
-
-        if (useBase64) {
-            try {
-                returner = require('./encoder').encodeBase64(returner); // TODO browser implementation
-            } catch(e) {
-                useBase64 = false;
-            }
-        }
-
-        returner = "'data:image/svg+xml" + (useBase64 ? ";base64" : "") + "," + returner + "'";
-        return new(tree.URL)(new(tree.Anonymous)(returner));
-    }
-};
-
-// these static methods are used as a fallback when the optional 'mime' dependency is missing
-tree._mime = {
-    // this map is intentionally incomplete
-    // if you want more, install 'mime' dep
-    _types: {
-        '.htm' : 'text/html',
-        '.html': 'text/html',
-        '.gif' : 'image/gif',
-        '.jpg' : 'image/jpeg',
-        '.jpeg': 'image/jpeg',
-        '.png' : 'image/png'
-    },
-    lookup: function (filepath) {
-        var ext = require('path').extname(filepath),
-            type = tree._mime._types[ext];
-        if (type === undefined) {
-            throw new Error('Optional dependency "mime" is required for ' + ext);
-        }
-        return type;
-    },
-    charsets: {
-        lookup: function (type) {
-            // assumes all text types are UTF-8
-            return type && (/^text\//).test(type) ? 'UTF-8' : '';
-        }
-    }
-};
-
-// Math
-
-var mathFunctions = {
- // name,  unit
-    ceil:  null,
-    floor: null,
-    sqrt:  null,
-    abs:   null,
-    tan:   "",
-    sin:   "",
-    cos:   "",
-    atan:  "rad",
-    asin:  "rad",
-    acos:  "rad"
-};
-
-function _math(fn, unit, n) {
-    if (!(n instanceof tree.Dimension)) {
-        throw { type: "Argument", message: "argument must be a number" };
-    }
-    if (unit == null) {
-        unit = n.unit;
-    } else {
-        n = n.unify();
-    }
-    return new(tree.Dimension)(fn(parseFloat(n.value)), unit);
-}
-
-// ~ End of Math
-
-// Color Blending
-// ref: http://www.w3.org/TR/compositing-1
-
-function colorBlend(mode, color1, color2) {
-    var ab = color1.alpha, cb, // backdrop
-        as = color2.alpha, cs, // source
-        ar, cr, r = [];        // result
-
-    ar = as + ab * (1 - as);
-    for (var i = 0; i < 3; i++) {
-        cb = color1.rgb[i] / 255;
-        cs = color2.rgb[i] / 255;
-        cr = mode(cb, cs);
-        if (ar) {
-            cr = (as * cs + ab * (cb
-                - as * (cb + cs - cr))) / ar;
-        }
-        r[i] = cr * 255;
-    }
-
-    return new(tree.Color)(r, ar);
-}
-
-var colorBlendMode = {
-    multiply: function(cb, cs) {
-        return cb * cs;
-    },
-    screen: function(cb, cs) {
-        return cb + cs - cb * cs;
-    },
-    overlay: function(cb, cs) {
-        cb *= 2;
-        return (cb <= 1)
-            ? colorBlendMode.multiply(cb, cs)
-            : colorBlendMode.screen(cb - 1, cs);
-    },
-    softlight: function(cb, cs) {
-        var d = 1, e = cb;
-        if (cs > 0.5) {
-            e = 1;
-            d = (cb > 0.25) ? Math.sqrt(cb)
-                : ((16 * cb - 12) * cb + 4) * cb;
-        }
-        return cb - (1 - 2 * cs) * e * (d - cb);
-    },
-    hardlight: function(cb, cs) {
-        return colorBlendMode.overlay(cs, cb);
-    },
-    difference: function(cb, cs) {
-        return Math.abs(cb - cs);
-    },
-    exclusion: function(cb, cs) {
-        return cb + cs - 2 * cb * cs;
-    },
-
-    // non-w3c functions:
-    average: function(cb, cs) {
-        return (cb + cs) / 2;
-    },
-    negation: function(cb, cs) {
-        return 1 - Math.abs(cb + cs - 1);
-    }
-};
-
-// ~ End of Color Blending
-
-tree.defaultFunc = {
-    eval: function () {
-        var v = this.value_, e = this.error_;
-        if (e) {
-            throw e;
-        }
-        if (v != null) {
-            return v ? tree.True : tree.False;
-        }
-    },
-    value: function (v) {
-        this.value_ = v;
-    },
-    error: function (e) {
-        this.error_ = e;
-    },
-    reset: function () {
-        this.value_ = this.error_ = null;
-    }
-};
-
-function initFunctions() {
-    var f, tf = tree.functions;
-
-    // math
-    for (f in mathFunctions) {
-        if (mathFunctions.hasOwnProperty(f)) {
-            tf[f] = _math.bind(null, Math[f], mathFunctions[f]);
-        }
-    }
-
-    // color blending
-    for (f in colorBlendMode) {
-        if (colorBlendMode.hasOwnProperty(f)) {
-            tf[f] = colorBlend.bind(null, colorBlendMode[f]);
-        }
-    }
-
-    // default
-    f = tree.defaultFunc;
-    tf["default"] = f.eval.bind(f);
-
-} initFunctions();
-
-function hsla(color) {
-    return tree.functions.hsla(color.h, color.s, color.l, color.a);
-}
-
-function scaled(n, size) {
-    if (n instanceof tree.Dimension && n.unit.is('%')) {
-        return parseFloat(n.value * size / 100);
-    } else {
-        return number(n);
-    }
-}
-
-function number(n) {
-    if (n instanceof tree.Dimension) {
-        return parseFloat(n.unit.is('%') ? n.value / 100 : n.value);
-    } else if (typeof(n) === 'number') {
-        return n;
-    } else {
-        throw {
-            error: "RuntimeError",
-            message: "color functions take numbers as parameters"
-        };
-    }
-}
-
-function clamp(val) {
-    return Math.min(1, Math.max(0, val));
-}
-
-tree.fround = function(env, value) {
-    var p = env && env.numPrecision;
-    //add "epsilon" to ensure numbers like 1.000000005 (represented as 1.000000004999....) are properly rounded...
-    return (p == null) ? value : Number((value + 2e-16).toFixed(p));
-};
-
-tree.functionCall = function(env, currentFileInfo) {
-    this.env = env;
-    this.currentFileInfo = currentFileInfo;
-};
-
-tree.functionCall.prototype = tree.functions;
-
-})(require('./tree'));
-
-(function (tree) {
-    tree.colors = {
-        'aliceblue':'#f0f8ff',
-        'antiquewhite':'#faebd7',
-        'aqua':'#00ffff',
-        'aquamarine':'#7fffd4',
-        'azure':'#f0ffff',
-        'beige':'#f5f5dc',
-        'bisque':'#ffe4c4',
-        'black':'#000000',
-        'blanchedalmond':'#ffebcd',
-        'blue':'#0000ff',
-        'blueviolet':'#8a2be2',
-        'brown':'#a52a2a',
-        'burlywood':'#deb887',
-        'cadetblue':'#5f9ea0',
-        'chartreuse':'#7fff00',
-        'chocolate':'#d2691e',
-        'coral':'#ff7f50',
-        'cornflowerblue':'#6495ed',
-        'cornsilk':'#fff8dc',
-        'crimson':'#dc143c',
-        'cyan':'#00ffff',
-        'darkblue':'#00008b',
-        'darkcyan':'#008b8b',
-        'darkgoldenrod':'#b8860b',
-        'darkgray':'#a9a9a9',
-        'darkgrey':'#a9a9a9',
-        'darkgreen':'#006400',
-        'darkkhaki':'#bdb76b',
-        'darkmagenta':'#8b008b',
-        'darkolivegreen':'#556b2f',
-        'darkorange':'#ff8c00',
-        'darkorchid':'#9932cc',
-        'darkred':'#8b0000',
-        'darksalmon':'#e9967a',
-        'darkseagreen':'#8fbc8f',
-        'darkslateblue':'#483d8b',
-        'darkslategray':'#2f4f4f',
-        'darkslategrey':'#2f4f4f',
-        'darkturquoise':'#00ced1',
-        'darkviolet':'#9400d3',
-        'deeppink':'#ff1493',
-        'deepskyblue':'#00bfff',
-        'dimgray':'#696969',
-        'dimgrey':'#696969',
-        'dodgerblue':'#1e90ff',
-        'firebrick':'#b22222',
-        'floralwhite':'#fffaf0',
-        'forestgreen':'#228b22',
-        'fuchsia':'#ff00ff',
-        'gainsboro':'#dcdcdc',
-        'ghostwhite':'#f8f8ff',
-        'gold':'#ffd700',
-        'goldenrod':'#daa520',
-        'gray':'#808080',
-        'grey':'#808080',
-        'green':'#008000',
-        'greenyellow':'#adff2f',
-        'honeydew':'#f0fff0',
-        'hotpink':'#ff69b4',
-        'indianred':'#cd5c5c',
-        'indigo':'#4b0082',
-        'ivory':'#fffff0',
-        'khaki':'#f0e68c',
-        'lavender':'#e6e6fa',
-        'lavenderblush':'#fff0f5',
-        'lawngreen':'#7cfc00',
-        'lemonchiffon':'#fffacd',
-        'lightblue':'#add8e6',
-        'lightcoral':'#f08080',
-        'lightcyan':'#e0ffff',
-        'lightgoldenrodyellow':'#fafad2',
-        'lightgray':'#d3d3d3',
-        'lightgrey':'#d3d3d3',
-        'lightgreen':'#90ee90',
-        'lightpink':'#ffb6c1',
-        'lightsalmon':'#ffa07a',
-        'lightseagreen':'#20b2aa',
-        'lightskyblue':'#87cefa',
-        'lightslategray':'#778899',
-        'lightslategrey':'#778899',
-        'lightsteelblue':'#b0c4de',
-        'lightyellow':'#ffffe0',
-        'lime':'#00ff00',
-        'limegreen':'#32cd32',
-        'linen':'#faf0e6',
-        'magenta':'#ff00ff',
-        'maroon':'#800000',
-        'mediumaquamarine':'#66cdaa',
-        'mediumblue':'#0000cd',
-        'mediumorchid':'#ba55d3',
-        'mediumpurple':'#9370d8',
-        'mediumseagreen':'#3cb371',
-        'mediumslateblue':'#7b68ee',
-        'mediumspringgreen':'#00fa9a',
-        'mediumturquoise':'#48d1cc',
-        'mediumvioletred':'#c71585',
-        'midnightblue':'#191970',
-        'mintcream':'#f5fffa',
-        'mistyrose':'#ffe4e1',
-        'moccasin':'#ffe4b5',
-        'navajowhite':'#ffdead',
-        'navy':'#000080',
-        'oldlace':'#fdf5e6',
-        'olive':'#808000',
-        'olivedrab':'#6b8e23',
-        'orange':'#ffa500',
-        'orangered':'#ff4500',
-        'orchid':'#da70d6',
-        'palegoldenrod':'#eee8aa',
-        'palegreen':'#98fb98',
-        'paleturquoise':'#afeeee',
-        'palevioletred':'#d87093',
-        'papayawhip':'#ffefd5',
-        'peachpuff':'#ffdab9',
-        'peru':'#cd853f',
-        'pink':'#ffc0cb',
-        'plum':'#dda0dd',
-        'powderblue':'#b0e0e6',
-        'purple':'#800080',
-        'red':'#ff0000',
-        'rosybrown':'#bc8f8f',
-        'royalblue':'#4169e1',
-        'saddlebrown':'#8b4513',
-        'salmon':'#fa8072',
-        'sandybrown':'#f4a460',
-        'seagreen':'#2e8b57',
-        'seashell':'#fff5ee',
-        'sienna':'#a0522d',
-        'silver':'#c0c0c0',
-        'skyblue':'#87ceeb',
-        'slateblue':'#6a5acd',
-        'slategray':'#708090',
-        'slategrey':'#708090',
-        'snow':'#fffafa',
-        'springgreen':'#00ff7f',
-        'steelblue':'#4682b4',
-        'tan':'#d2b48c',
-        'teal':'#008080',
-        'thistle':'#d8bfd8',
-        'tomato':'#ff6347',
-        'turquoise':'#40e0d0',
-        'violet':'#ee82ee',
-        'wheat':'#f5deb3',
-        'white':'#ffffff',
-        'whitesmoke':'#f5f5f5',
-        'yellow':'#ffff00',
-        'yellowgreen':'#9acd32'
-    };
-})(require('./tree'));
-
-(function (tree) {
-
-tree.debugInfo = function(env, ctx, lineSeperator) {
-    var result="";
-    if (env.dumpLineNumbers && !env.compress) {
-        switch(env.dumpLineNumbers) {
-            case 'comments':
-                result = tree.debugInfo.asComment(ctx);
-                break;
-            case 'mediaquery':
-                result = tree.debugInfo.asMediaQuery(ctx);
-                break;
-            case 'all':
-                result = tree.debugInfo.asComment(ctx) + (lineSeperator || "") + tree.debugInfo.asMediaQuery(ctx);
-                break;
-        }
-    }
-    return result;
-};
-
-tree.debugInfo.asComment = function(ctx) {
-    return '/* line ' + ctx.debugInfo.lineNumber + ', ' + ctx.debugInfo.fileName + ' */\n';
-};
-
-tree.debugInfo.asMediaQuery = function(ctx) {
-    return '@media -sass-debug-info{filename{font-family:' +
-        ('file://' + ctx.debugInfo.fileName).replace(/([.:\/\\])/g, function (a) {
-            if (a == '\\') {
-                a = '\/';
-            }
-            return '\\' + a;
-        }) +
-        '}line{font-family:\\00003' + ctx.debugInfo.lineNumber + '}}\n';
-};
-
-tree.find = function (obj, fun) {
-    for (var i = 0, r; i < obj.length; i++) {
-        r = fun.call(obj, obj[i]);
-        if (r) { return r; }
-    }
-    return null;
-};
-
-tree.jsify = function (obj) {
-    if (Array.isArray(obj.value) && (obj.value.length > 1)) {
-        return '[' + obj.value.map(function (v) { return v.toCSS(false); }).join(', ') + ']';
-    } else {
-        return obj.toCSS(false);
-    }
-};
-
-tree.toCSS = function (env) {
-    var strs = [];
-    this.genCSS(env, {
-        add: function(chunk, fileInfo, index) {
-            strs.push(chunk);
-        },
-        isEmpty: function () {
-            return strs.length === 0;
-        }
-    });
-    return strs.join('');
-};
-
-tree.outputRuleset = function (env, output, rules) {
-    var ruleCnt = rules.length, i;
-    env.tabLevel = (env.tabLevel | 0) + 1;
-
-    // Compressed
-    if (env.compress) {
-        output.add('{');
-        for (i = 0; i < ruleCnt; i++) {
-            rules[i].genCSS(env, output);
-        }
-        output.add('}');
-        env.tabLevel--;
-        return;
-    }
-
-    // Non-compressed
-    var tabSetStr = '\n' + Array(env.tabLevel).join("  "), tabRuleStr = tabSetStr + "  ";
-    if (!ruleCnt) {
-        output.add(" {" + tabSetStr + '}');
-    } else {
-        output.add(" {" + tabRuleStr);
-        rules[0].genCSS(env, output);
-        for (i = 1; i < ruleCnt; i++) {
-            output.add(tabRuleStr);
-            rules[i].genCSS(env, output);
-        }
-        output.add(tabSetStr + '}');
-    }
-
-    env.tabLevel--;
-};
-
-})(require('./tree'));
-
-(function (tree) {
-
-tree.Alpha = function (val) {
-    this.value = val;
-};
-tree.Alpha.prototype = {
-    type: "Alpha",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) { return new tree.Alpha(this.value.eval(env)); }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add("alpha(opacity=");
-
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-
-        output.add(")");
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Anonymous = function (value, index, currentFileInfo, mapLines) {
-    this.value = value;
-    this.index = index;
-    this.mapLines = mapLines;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Anonymous.prototype = {
-    type: "Anonymous",
-    eval: function () {
-        return new tree.Anonymous(this.value, this.index, this.currentFileInfo, this.mapLines);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left = this.toCSS(),
-            right = x.toCSS();
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    },
-    genCSS: function (env, output) {
-        output.add(this.value, this.currentFileInfo, this.index, this.mapLines);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Assignment = function (key, val) {
-    this.key = key;
-    this.value = val;
-};
-tree.Assignment.prototype = {
-    type: "Assignment",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) {
-            return new(tree.Assignment)(this.key, this.value.eval(env));
-        }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add(this.key + '=');
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A function call node.
-//
-tree.Call = function (name, args, index, currentFileInfo) {
-    this.name = name;
-    this.args = args;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Call.prototype = {
-    type: "Call",
-    accept: function (visitor) {
-        if (this.args) {
-            this.args = visitor.visitArray(this.args);
-        }
-    },
-    //
-    // When evaluating a function call,
-    // we either find the function in `tree.functions` [1],
-    // in which case we call it, passing the  evaluated arguments,
-    // if this returns null or we cannot find the function, we
-    // simply print it out as it appeared originally [2].
-    //
-    // The *functions.js* file contains the built-in functions.
-    //
-    // The reason why we evaluate the arguments, is in the case where
-    // we try to pass a variable to a function, like: `saturate(@color)`.
-    // The function should receive the value, not the variable.
-    //
-    eval: function (env) {
-        var args = this.args.map(function (a) { return a.eval(env); }),
-            nameLC = this.name.toLowerCase(),
-            result, func;
-
-        if (nameLC in tree.functions) { // 1.
-            try {
-                func = new tree.functionCall(env, this.currentFileInfo);
-                result = func[nameLC].apply(func, args);
-                if (result != null) {
-                    return result;
-                }
-            } catch (e) {
-                throw { type: e.type || "Runtime",
-                        message: "error evaluating function `" + this.name + "`" +
-                                 (e.message ? ': ' + e.message : ''),
-                        index: this.index, filename: this.currentFileInfo.filename };
-            }
-        }
-
-        return new tree.Call(this.name, args, this.index, this.currentFileInfo);
-    },
-
-    genCSS: function (env, output) {
-        output.add(this.name + "(", this.currentFileInfo, this.index);
-
-        for(var i = 0; i < this.args.length; i++) {
-            this.args[i].genCSS(env, output);
-            if (i + 1 < this.args.length) {
-                output.add(", ");
-            }
-        }
-
-        output.add(")");
-    },
-
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// RGB Colors - #ff0014, #eee
-//
-tree.Color = function (rgb, a) {
-    //
-    // The end goal here, is to parse the arguments
-    // into an integer triplet, such as `128, 255, 0`
-    //
-    // This facilitates operations and conversions.
-    //
-    if (Array.isArray(rgb)) {
-        this.rgb = rgb;
-    } else if (rgb.length == 6) {
-        this.rgb = rgb.match(/.{2}/g).map(function (c) {
-            return parseInt(c, 16);
-        });
-    } else {
-        this.rgb = rgb.split('').map(function (c) {
-            return parseInt(c + c, 16);
-        });
-    }
-    this.alpha = typeof(a) === 'number' ? a : 1;
-};
-
-var transparentKeyword = "transparent";
-
-tree.Color.prototype = {
-    type: "Color",
-    eval: function () { return this; },
-    luma: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255;
-
-        r = (r <= 0.03928) ? r / 12.92 : Math.pow(((r + 0.055) / 1.055), 2.4);
-        g = (g <= 0.03928) ? g / 12.92 : Math.pow(((g + 0.055) / 1.055), 2.4);
-        b = (b <= 0.03928) ? b / 12.92 : Math.pow(((b + 0.055) / 1.055), 2.4);
-
-        return 0.2126 * r + 0.7152 * g + 0.0722 * b;
-    },
-
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env, doNotCompress) {
-        var compress = env && env.compress && !doNotCompress,
-            alpha = tree.fround(env, this.alpha);
-
-        // If we have some transparency, the only way to represent it
-        // is via `rgba`. Otherwise, we use the hex representation,
-        // which has better compatibility with older browsers.
-        // Values are capped between `0` and `255`, rounded and zero-padded.
-        if (alpha < 1) {
-            if (alpha === 0 && this.isTransparentKeyword) {
-                return transparentKeyword;
-            }
-            return "rgba(" + this.rgb.map(function (c) {
-                return clamp(Math.round(c), 255);
-            }).concat(clamp(alpha, 1))
-                .join(',' + (compress ? '' : ' ')) + ")";
-        } else {
-            var color = this.toRGB();
-
-            if (compress) {
-                var splitcolor = color.split('');
-
-                // Convert color to short format
-                if (splitcolor[1] === splitcolor[2] && splitcolor[3] === splitcolor[4] && splitcolor[5] === splitcolor[6]) {
-                    color = '#' + splitcolor[1] + splitcolor[3] + splitcolor[5];
-                }
-            }
-
-            return color;
-        }
-    },
-
-    //
-    // Operations have to be done per-channel, if not,
-    // channels will spill onto each other. Once we have
-    // our result, in the form of an integer triplet,
-    // we create a new Color node to hold the result.
-    //
-    operate: function (env, op, other) {
-        var rgb = [];
-        var alpha = this.alpha * (1 - other.alpha) + other.alpha;
-        for (var c = 0; c < 3; c++) {
-            rgb[c] = tree.operate(env, op, this.rgb[c], other.rgb[c]);
-        }
-        return new(tree.Color)(rgb, alpha);
-    },
-
-    toRGB: function () {
-        return toHex(this.rgb);
-    },
-
-    toHSL: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, l = (max + min) / 2, d = max - min;
-
-        if (max === min) {
-            h = s = 0;
-        } else {
-            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
-
-            switch (max) {
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2;               break;
-                case b: h = (r - g) / d + 4;               break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, l: l, a: a };
-    },
-    //Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
-    toHSV: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, v = max;
-
-        var d = max - min;
-        if (max === 0) {
-            s = 0;
-        } else {
-            s = d / max;
-        }
-
-        if (max === min) {
-            h = 0;
-        } else {
-            switch(max){
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2; break;
-                case b: h = (r - g) / d + 4; break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, v: v, a: a };
-    },
-    toARGB: function () {
-        return toHex([this.alpha * 255].concat(this.rgb));
-    },
-    compare: function (x) {
-        if (!x.rgb) {
-            return -1;
-        }
-
-        return (x.rgb[0] === this.rgb[0] &&
-            x.rgb[1] === this.rgb[1] &&
-            x.rgb[2] === this.rgb[2] &&
-            x.alpha === this.alpha) ? 0 : -1;
-    }
-};
-
-tree.Color.fromKeyword = function(keyword) {
-    keyword = keyword.toLowerCase();
-
-    if (tree.colors.hasOwnProperty(keyword)) {
-        // detect named color
-        return new(tree.Color)(tree.colors[keyword].slice(1));
-    }
-    if (keyword === transparentKeyword) {
-        var transparent = new(tree.Color)([0, 0, 0], 0);
-        transparent.isTransparentKeyword = true;
-        return transparent;
-    }
-};
-
-function toHex(v) {
-    return '#' + v.map(function (c) {
-        c = clamp(Math.round(c), 255);
-        return (c < 16 ? '0' : '') + c.toString(16);
-    }).join('');
-}
-
-function clamp(v, max) {
-    return Math.min(Math.max(v, 0), max);
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Comment = function (value, silent, index, currentFileInfo) {
-    this.value = value;
-    this.silent = !!silent;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Comment.prototype = {
-    type: "Comment",
-    genCSS: function (env, output) {
-        if (this.debugInfo) {
-            output.add(tree.debugInfo(env, this), this.currentFileInfo, this.index);
-        }
-        output.add(this.value.trim()); //TODO shouldn't need to trim, we shouldn't grab the \n
-    },
-    toCSS: tree.toCSS,
-    isSilent: function(env) {
-        var isReference = (this.currentFileInfo && this.currentFileInfo.reference && !this.isReferenced),
-            isCompressed = env.compress && !this.value.match(/^\/\*!/);
-        return this.silent || isReference || isCompressed;
-    },
-    eval: function () { return this; },
-    markReferenced: function () {
-        this.isReferenced = true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Condition = function (op, l, r, i, negate) {
-    this.op = op.trim();
-    this.lvalue = l;
-    this.rvalue = r;
-    this.index = i;
-    this.negate = negate;
-};
-tree.Condition.prototype = {
-    type: "Condition",
-    accept: function (visitor) {
-        this.lvalue = visitor.visit(this.lvalue);
-        this.rvalue = visitor.visit(this.rvalue);
-    },
-    eval: function (env) {
-        var a = this.lvalue.eval(env),
-            b = this.rvalue.eval(env);
-
-        var i = this.index, result;
-
-        result = (function (op) {
-            switch (op) {
-                case 'and':
-                    return a && b;
-                case 'or':
-                    return a || b;
-                default:
-                    if (a.compare) {
-                        result = a.compare(b);
-                    } else if (b.compare) {
-                        result = b.compare(a);
-                    } else {
-                        throw { type: "Type",
-                                message: "Unable to perform comparison",
-                                index: i };
-                    }
-                    switch (result) {
-                        case -1: return op === '<' || op === '=<' || op === '<=';
-                        case  0: return op === '=' || op === '>=' || op === '=<' || op === '<=';
-                        case  1: return op === '>' || op === '>=';
-                    }
-            }
-        })(this.op);
-        return this.negate ? !result : result;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.DetachedRuleset = function (ruleset, frames) {
-    this.ruleset = ruleset;
-    this.frames = frames;
-};
-tree.DetachedRuleset.prototype = {
-    type: "DetachedRuleset",
-    accept: function (visitor) {
-        this.ruleset = visitor.visit(this.ruleset);
-    },
-    eval: function (env) {
-        var frames = this.frames || env.frames.slice(0);
-        return new tree.DetachedRuleset(this.ruleset, frames);
-    },
-    callEval: function (env) {
-        return this.ruleset.eval(this.frames ? new(tree.evalEnv)(env, this.frames.concat(env.frames)) : env);
-    }
-};
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A number with a unit
-//
-tree.Dimension = function (value, unit) {
-    this.value = parseFloat(value);
-    this.unit = (unit && unit instanceof tree.Unit) ? unit :
-      new(tree.Unit)(unit ? [unit] : undefined);
-};
-
-tree.Dimension.prototype = {
-    type: "Dimension",
-    accept: function (visitor) {
-        this.unit = visitor.visit(this.unit);
-    },
-    eval: function (env) {
-        return this;
-    },
-    toColor: function () {
-        return new(tree.Color)([this.value, this.value, this.value]);
-    },
-    genCSS: function (env, output) {
-        if ((env && env.strictUnits) && !this.unit.isSingular()) {
-            throw new Error("Multiple units in dimension. Correct the units or use the unit function. Bad unit: "+this.unit.toString());
-        }
-
-        var value = tree.fround(env, this.value),
-            strValue = String(value);
-
-        if (value !== 0 && value < 0.000001 && value > -0.000001) {
-            // would be output 1e-6 etc.
-            strValue = value.toFixed(20).replace(/0+$/, "");
-        }
-
-        if (env && env.compress) {
-            // Zero values doesn't need a unit
-            if (value === 0 && this.unit.isLength()) {
-                output.add(strValue);
-                return;
-            }
-
-            // Float values doesn't need a leading zero
-            if (value > 0 && value < 1) {
-                strValue = (strValue).substr(1);
-            }
-        }
-
-        output.add(strValue);
-        this.unit.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-
-    // In an operation between two Dimensions,
-    // we default to the first Dimension's unit,
-    // so `1px + 2` will yield `3px`.
-    operate: function (env, op, other) {
-        /*jshint noempty:false */
-        var value = tree.operate(env, op, this.value, other.value),
-            unit = this.unit.clone();
-
-        if (op === '+' || op === '-') {
-            if (unit.numerator.length === 0 && unit.denominator.length === 0) {
-                unit.numerator = other.unit.numerator.slice(0);
-                unit.denominator = other.unit.denominator.slice(0);
-            } else if (other.unit.numerator.length === 0 && unit.denominator.length === 0) {
-                // do nothing
-            } else {
-                other = other.convertTo(this.unit.usedUnits());
-
-                if(env.strictUnits && other.unit.toString() !== unit.toString()) {
-                  throw new Error("Incompatible units. Change the units or use the unit function. Bad units: '" + unit.toString() +
-                    "' and '" + other.unit.toString() + "'.");
-                }
-
-                value = tree.operate(env, op, this.value, other.value);
-            }
-        } else if (op === '*') {
-            unit.numerator = unit.numerator.concat(other.unit.numerator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.denominator).sort();
-            unit.cancel();
-        } else if (op === '/') {
-            unit.numerator = unit.numerator.concat(other.unit.denominator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.numerator).sort();
-            unit.cancel();
-        }
-        return new(tree.Dimension)(value, unit);
-    },
-
-    compare: function (other) {
-        if (other instanceof tree.Dimension) {
-            var a, b,
-                aValue, bValue;
-
-            if (this.unit.isEmpty() || other.unit.isEmpty()) {
-                a = this;
-                b = other;
-            } else {
-                a = this.unify();
-                b = other.unify();
-                if (a.unit.compare(b.unit) !== 0) {
-                    return -1;
-                }
-            }
-            aValue = a.value;
-            bValue = b.value;
-
-            if (bValue > aValue) {
-                return -1;
-            } else if (bValue < aValue) {
-                return 1;
-            } else {
-                return 0;
-            }
-        } else {
-            return -1;
-        }
-    },
-
-    unify: function () {
-        return this.convertTo({ length: 'px', duration: 's', angle: 'rad' });
-    },
-
-    convertTo: function (conversions) {
-        var value = this.value, unit = this.unit.clone(),
-            i, groupName, group, targetUnit, derivedConversions = {}, applyUnit;
-
-        if (typeof conversions === 'string') {
-            for(i in tree.UnitConversions) {
-                if (tree.UnitConversions[i].hasOwnProperty(conversions)) {
-                    derivedConversions = {};
-                    derivedConversions[i] = conversions;
-                }
-            }
-            conversions = derivedConversions;
-        }
-        applyUnit = function (atomicUnit, denominator) {
-          /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit)) {
-                if (denominator) {
-                    value = value / (group[atomicUnit] / group[targetUnit]);
-                } else {
-                    value = value * (group[atomicUnit] / group[targetUnit]);
-                }
-
-                return targetUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (groupName in conversions) {
-            if (conversions.hasOwnProperty(groupName)) {
-                targetUnit = conversions[groupName];
-                group = tree.UnitConversions[groupName];
-
-                unit.map(applyUnit);
-            }
-        }
-
-        unit.cancel();
-
-        return new(tree.Dimension)(value, unit);
-    }
-};
-
-// http://www.w3.org/TR/css3-values/#absolute-lengths
-tree.UnitConversions = {
-    length: {
-         'm': 1,
-        'cm': 0.01,
-        'mm': 0.001,
-        'in': 0.0254,
-        'px': 0.0254 / 96,
-        'pt': 0.0254 / 72,
-        'pc': 0.0254 / 72 * 12
-    },
-    duration: {
-        's': 1,
-        'ms': 0.001
-    },
-    angle: {
-        'rad': 1/(2*Math.PI),
-        'deg': 1/360,
-        'grad': 1/400,
-        'turn': 1
-    }
-};
-
-tree.Unit = function (numerator, denominator, backupUnit) {
-    this.numerator = numerator ? numerator.slice(0).sort() : [];
-    this.denominator = denominator ? denominator.slice(0).sort() : [];
-    this.backupUnit = backupUnit;
-};
-
-tree.Unit.prototype = {
-    type: "Unit",
-    clone: function () {
-        return new tree.Unit(this.numerator.slice(0), this.denominator.slice(0), this.backupUnit);
-    },
-    genCSS: function (env, output) {
-        if (this.numerator.length >= 1) {
-            output.add(this.numerator[0]);
-        } else
-        if (this.denominator.length >= 1) {
-            output.add(this.denominator[0]);
-        } else
-        if ((!env || !env.strictUnits) && this.backupUnit) {
-            output.add(this.backupUnit);
-        }
-    },
-    toCSS: tree.toCSS,
-
-    toString: function () {
-      var i, returnStr = this.numerator.join("*");
-      for (i = 0; i < this.denominator.length; i++) {
-          returnStr += "/" + this.denominator[i];
-      }
-      return returnStr;
-    },
-
-    compare: function (other) {
-        return this.is(other.toString()) ? 0 : -1;
-    },
-
-    is: function (unitString) {
-        return this.toString() === unitString;
-    },
-
-    isLength: function () {
-        return Boolean(this.toCSS().match(/px|em|%|in|cm|mm|pc|pt|ex/));
-    },
-
-    isEmpty: function () {
-        return this.numerator.length === 0 && this.denominator.length === 0;
-    },
-
-    isSingular: function() {
-        return this.numerator.length <= 1 && this.denominator.length === 0;
-    },
-
-    map: function(callback) {
-        var i;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            this.numerator[i] = callback(this.numerator[i], false);
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            this.denominator[i] = callback(this.denominator[i], true);
-        }
-    },
-
-    usedUnits: function() {
-        var group, result = {}, mapUnit;
-
-        mapUnit = function (atomicUnit) {
-        /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit) && !result[groupName]) {
-                result[groupName] = atomicUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (var groupName in tree.UnitConversions) {
-            if (tree.UnitConversions.hasOwnProperty(groupName)) {
-                group = tree.UnitConversions[groupName];
-
-                this.map(mapUnit);
-            }
-        }
-
-        return result;
-    },
-
-    cancel: function () {
-        var counter = {}, atomicUnit, i, backup;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            atomicUnit = this.numerator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) + 1;
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            atomicUnit = this.denominator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) - 1;
-        }
-
-        this.numerator = [];
-        this.denominator = [];
-
-        for (atomicUnit in counter) {
-            if (counter.hasOwnProperty(atomicUnit)) {
-                var count = counter[atomicUnit];
-
-                if (count > 0) {
-                    for (i = 0; i < count; i++) {
-                        this.numerator.push(atomicUnit);
-                    }
-                } else if (count < 0) {
-                    for (i = 0; i < -count; i++) {
-                        this.denominator.push(atomicUnit);
-                    }
-                }
-            }
-        }
-
-        if (this.numerator.length === 0 && this.denominator.length === 0 && backup) {
-            this.backupUnit = backup;
-        }
-
-        this.numerator.sort();
-        this.denominator.sort();
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Directive = function (name, value, rules, index, currentFileInfo, debugInfo) {
-    this.name  = name;
-    this.value = value;
-    if (rules) {
-        this.rules = rules;
-        this.rules.allowImports = true;
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.debugInfo = debugInfo;
-};
-
-tree.Directive.prototype = {
-    type: "Directive",
-    accept: function (visitor) {
-        var value = this.value, rules = this.rules;
-        if (rules) {
-            rules = visitor.visit(rules);
-        }
-        if (value) {
-            value = visitor.visit(value);
-        }
-    },
-    genCSS: function (env, output) {
-        var value = this.value, rules = this.rules;
-        output.add(this.name, this.currentFileInfo, this.index);
-        if (value) {
-            output.add(' ');
-            value.genCSS(env, output);
-        }
-        if (rules) {
-            tree.outputRuleset(env, output, [rules]);
-        } else {
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var value = this.value, rules = this.rules;
-        if (value) {
-            value = value.eval(env);
-        }
-        if (rules) {
-            rules = rules.eval(env);
-            rules.root = true;
-        }
-        return new(tree.Directive)(this.name, value, rules,
-            this.index, this.currentFileInfo, this.debugInfo);
-    },
-    variable: function (name) { if (this.rules) return tree.Ruleset.prototype.variable.call(this.rules, name); },
-    find: function () { if (this.rules) return tree.Ruleset.prototype.find.apply(this.rules, arguments); },
-    rulesets: function () { if (this.rules) return tree.Ruleset.prototype.rulesets.apply(this.rules); },
-    markReferenced: function () {
-        var i, rules;
-        this.isReferenced = true;
-        if (this.rules) {
-            rules = this.rules.rules;
-            for (i = 0; i < rules.length; i++) {
-                if (rules[i].markReferenced) {
-                    rules[i].markReferenced();
-                }
-            }
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Element = function (combinator, value, index, currentFileInfo) {
-    this.combinator = combinator instanceof tree.Combinator ?
-                      combinator : new(tree.Combinator)(combinator);
-
-    if (typeof(value) === 'string') {
-        this.value = value.trim();
-    } else if (value) {
-        this.value = value;
-    } else {
-        this.value = "";
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Element.prototype = {
-    type: "Element",
-    accept: function (visitor) {
-        var value = this.value;
-        this.combinator = visitor.visit(this.combinator);
-        if (typeof value === "object") {
-            this.value = visitor.visit(value);
-        }
-    },
-    eval: function (env) {
-        return new(tree.Element)(this.combinator,
-                                 this.value.eval ? this.value.eval(env) : this.value,
-                                 this.index,
-                                 this.currentFileInfo);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env), this.currentFileInfo, this.index);
-    },
-    toCSS: function (env) {
-        var value = (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        if (value === '' && this.combinator.value.charAt(0) === '&') {
-            return '';
-        } else {
-            return this.combinator.toCSS(env || {}) + value;
-        }
-    }
-};
-
-tree.Attribute = function (key, op, value) {
-    this.key = key;
-    this.op = op;
-    this.value = value;
-};
-tree.Attribute.prototype = {
-    type: "Attribute",
-    eval: function (env) {
-        return new(tree.Attribute)(this.key.eval ? this.key.eval(env) : this.key,
-            this.op, (this.value && this.value.eval) ? this.value.eval(env) : this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env) {
-        var value = this.key.toCSS ? this.key.toCSS(env) : this.key;
-
-        if (this.op) {
-            value += this.op;
-            value += (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        }
-
-        return '[' + value + ']';
-    }
-};
-
-tree.Combinator = function (value) {
-    if (value === ' ') {
-        this.value = ' ';
-    } else {
-        this.value = value ? value.trim() : "";
-    }
-};
-tree.Combinator.prototype = {
-    type: "Combinator",
-    _outputMap: {
-        ''  : '',
-        ' ' : ' ',
-        ':' : ' :',
-        '+' : ' + ',
-        '~' : ' ~ ',
-        '>' : ' > ',
-        '|' : '|',
-        '^' : ' ^ ',
-        '^^' : ' ^^ '
-    },
-    _outputMapCompressed: {
-        ''  : '',
-        ' ' : ' ',
-        ':' : ' :',
-        '+' : '+',
-        '~' : '~',
-        '>' : '>',
-        '|' : '|',
-        '^' : '^',
-        '^^' : '^^'
-    },
-    genCSS: function (env, output) {
-        output.add((env.compress ? this._outputMapCompressed : this._outputMap)[this.value]);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Expression = function (value) { this.value = value; };
-tree.Expression.prototype = {
-    type: "Expression",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        var returnValue,
-            inParenthesis = this.parens && !this.parensInOp,
-            doubleParen = false;
-        if (inParenthesis) {
-            env.inParenthesis();
-        }
-        if (this.value.length > 1) {
-            returnValue = new(tree.Expression)(this.value.map(function (e) {
-                return e.eval(env);
-            }));
-        } else if (this.value.length === 1) {
-            if (this.value[0].parens && !this.value[0].parensInOp) {
-                doubleParen = true;
-            }
-            returnValue = this.value[0].eval(env);
-        } else {
-            returnValue = this;
-        }
-        if (inParenthesis) {
-            env.outOfParenthesis();
-        }
-        if (this.parens && this.parensInOp && !(env.isMathOn()) && !doubleParen) {
-            returnValue = new(tree.Paren)(returnValue);
-        }
-        return returnValue;
-    },
-    genCSS: function (env, output) {
-        for(var i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i + 1 < this.value.length) {
-                output.add(" ");
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    throwAwayComments: function () {
-        this.value = this.value.filter(function(v) {
-            return !(v instanceof tree.Comment);
-        });
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Extend = function Extend(selector, option, index) {
-    this.selector = selector;
-    this.option = option;
-    this.index = index;
-    this.object_id = tree.Extend.next_id++;
-    this.parent_ids = [this.object_id];
-
-    switch(option) {
-        case "all":
-            this.allowBefore = true;
-            this.allowAfter = true;
-        break;
-        default:
-            this.allowBefore = false;
-            this.allowAfter = false;
-        break;
-    }
-};
-tree.Extend.next_id = 0;
-
-tree.Extend.prototype = {
-    type: "Extend",
-    accept: function (visitor) {
-        this.selector = visitor.visit(this.selector);
-    },
-    eval: function (env) {
-        return new(tree.Extend)(this.selector.eval(env), this.option, this.index);
-    },
-    clone: function (env) {
-        return new(tree.Extend)(this.selector, this.option, this.index);
-    },
-    findSelfSelectors: function (selectors) {
-        var selfElements = [],
-            i,
-            selectorElements;
-
-        for(i = 0; i < selectors.length; i++) {
-            selectorElements = selectors[i].elements;
-            // duplicate the logic in genCSS function inside the selector node.
-            // future TODO - move both logics into the selector joiner visitor
-            if (i > 0 && selectorElements.length && selectorElements[0].combinator.value === "") {
-                selectorElements[0].combinator.value = ' ';
-            }
-            selfElements = selfElements.concat(selectors[i].elements);
-        }
-
-        this.selfSelectors = [{ elements: selfElements }];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// CSS @import node
-//
-// The general strategy here is that we don't want to wait
-// for the parsing to be completed, before we start importing
-// the file. That's because in the context of a browser,
-// most of the time will be spent waiting for the server to respond.
-//
-// On creation, we push the import path to our import queue, though
-// `import,push`, we also pass it a callback, which it'll call once
-// the file has been fetched, and parsed.
-//
-tree.Import = function (path, features, options, index, currentFileInfo) {
-    this.options = options;
-    this.index = index;
-    this.path = path;
-    this.features = features;
-    this.currentFileInfo = currentFileInfo;
-
-    if (this.options.less !== undefined || this.options.inline) {
-        this.css = !this.options.less || this.options.inline;
-    } else {
-        var pathValue = this.getPath();
-        if (pathValue && /css([\?;].*)?$/.test(pathValue)) {
-            this.css = true;
-        }
-    }
-};
-
-//
-// The actual import node doesn't return anything, when converted to CSS.
-// The reason is that it's used at the evaluation stage, so that the rules
-// it imports can be treated like any other rules.
-//
-// In `eval`, we make sure all Import nodes get evaluated, recursively, so
-// we end up with a flat structure, which can easily be imported in the parent
-// ruleset.
-//
-tree.Import.prototype = {
-    type: "Import",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        this.path = visitor.visit(this.path);
-        if (!this.options.inline && this.root) {
-            this.root = visitor.visit(this.root);
-        }
-    },
-    genCSS: function (env, output) {
-        if (this.css) {
-            output.add("@import ", this.currentFileInfo, this.index);
-            this.path.genCSS(env, output);
-            if (this.features) {
-                output.add(" ");
-                this.features.genCSS(env, output);
-            }
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    getPath: function () {
-        if (this.path instanceof tree.Quoted) {
-            var path = this.path.value;
-            return (this.css !== undefined || /(\.[a-z]*$)|([\?;].*)$/.test(path)) ? path : path + '.less';
-        } else if (this.path instanceof tree.URL) {
-            return this.path.value.value;
-        }
-        return null;
-    },
-    evalForImport: function (env) {
-        return new(tree.Import)(this.path.eval(env), this.features, this.options, this.index, this.currentFileInfo);
-    },
-    evalPath: function (env) {
-        var path = this.path.eval(env);
-        var rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-
-        if (!(path instanceof tree.URL)) {
-            if (rootpath) {
-                var pathValue = path.value;
-                // Add the base path if the import is relative
-                if (pathValue && env.isPathRelative(pathValue)) {
-                    path.value = rootpath +pathValue;
-                }
-            }
-            path.value = env.normalizePath(path.value);
-        }
-
-        return path;
-    },
-    eval: function (env) {
-        var ruleset, features = this.features && this.features.eval(env);
-
-        if (this.skip) {
-            if (typeof this.skip === "function") {
-                this.skip = this.skip();
-            }
-            if (this.skip) {
-                return [];
-            }
-        }
-
-        if (this.options.inline) {
-            //todo needs to reference css file not import
-            var contents = new(tree.Anonymous)(this.root, 0, {filename: this.importedFilename}, true);
-            return this.features ? new(tree.Media)([contents], this.features.value) : [contents];
-        } else if (this.css) {
-            var newImport = new(tree.Import)(this.evalPath(env), features, this.options, this.index);
-            if (!newImport.css && this.error) {
-                throw this.error;
-            }
-            return newImport;
-        } else {
-            ruleset = new(tree.Ruleset)(null, this.root.rules.slice(0));
-
-            ruleset.evalImports(env);
-
-            return this.features ? new(tree.Media)(ruleset.rules, this.features.value) : ruleset.rules;
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.JavaScript = function (string, index, escaped) {
-    this.escaped = escaped;
-    this.expression = string;
-    this.index = index;
-};
-tree.JavaScript.prototype = {
-    type: "JavaScript",
-    eval: function (env) {
-        var result,
-            that = this,
-            context = {};
-
-        var expression = this.expression.replace(/@\{([\w-]+)\}/g, function (_, name) {
-            return tree.jsify(new(tree.Variable)('@' + name, that.index).eval(env));
-        });
-
-        try {
-            expression = new(Function)('return (' + expression + ')');
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: " + e.message + " from `" + expression + "`" ,
-                    index: this.index };
-        }
-
-        var variables = env.frames[0].variables();
-        for (var k in variables) {
-            if (variables.hasOwnProperty(k)) {
-                /*jshint loopfunc:true */
-                context[k.slice(1)] = {
-                    value: variables[k].value,
-                    toJS: function () {
-                        return this.value.eval(env).toCSS();
-                    }
-                };
-            }
-        }
-
-        try {
-            result = expression.call(context);
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: '" + e.name + ': ' + e.message.replace(/["]/g, "'") + "'" ,
-                    index: this.index };
-        }
-        if (typeof(result) === 'number') {
-            return new(tree.Dimension)(result);
-        } else if (typeof(result) === 'string') {
-            return new(tree.Quoted)('"' + result + '"', result, this.escaped, this.index);
-        } else if (Array.isArray(result)) {
-            return new(tree.Anonymous)(result.join(', '));
-        } else {
-            return new(tree.Anonymous)(result);
-        }
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Keyword = function (value) { this.value = value; };
-tree.Keyword.prototype = {
-    type: "Keyword",
-    eval: function () { return this; },
-    genCSS: function (env, output) {
-        if (this.value === '%') { throw { type: "Syntax", message: "Invalid % without number" }; }
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    compare: function (other) {
-        if (other instanceof tree.Keyword) {
-            return other.value === this.value ? 0 : 1;
-        } else {
-            return -1;
-        }
-    }
-};
-
-tree.True = new(tree.Keyword)('true');
-tree.False = new(tree.Keyword)('false');
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Media = function (value, features, index, currentFileInfo) {
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-
-    var selectors = this.emptySelectors();
-
-    this.features = new(tree.Value)(features);
-    this.rules = [new(tree.Ruleset)(selectors, value)];
-    this.rules[0].allowImports = true;
-};
-tree.Media.prototype = {
-    type: "Media",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        if (this.rules) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    genCSS: function (env, output) {
-        output.add('@media ', this.currentFileInfo, this.index);
-        this.features.genCSS(env, output);
-        tree.outputRuleset(env, output, this.rules);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (!env.mediaBlocks) {
-            env.mediaBlocks = [];
-            env.mediaPath = [];
-        }
-
-        var media = new(tree.Media)(null, [], this.index, this.currentFileInfo);
-        if(this.debugInfo) {
-            this.rules[0].debugInfo = this.debugInfo;
-            media.debugInfo = this.debugInfo;
-        }
-        var strictMathBypass = false;
-        if (!env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            media.features = this.features.eval(env);
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-
-        env.mediaPath.push(media);
-        env.mediaBlocks.push(media);
-
-        env.frames.unshift(this.rules[0]);
-        media.rules = [this.rules[0].eval(env)];
-        env.frames.shift();
-
-        env.mediaPath.pop();
-
-        return env.mediaPath.length === 0 ? media.evalTop(env) :
-                    media.evalNested(env);
-    },
-    variable: function (name) { return tree.Ruleset.prototype.variable.call(this.rules[0], name); },
-    find: function () { return tree.Ruleset.prototype.find.apply(this.rules[0], arguments); },
-    rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.rules[0]); },
-    emptySelectors: function() {
-        var el = new(tree.Element)('', '&', this.index, this.currentFileInfo),
-            sels = [new(tree.Selector)([el], null, null, this.index, this.currentFileInfo)];
-        sels[0].mediaEmpty = true;
-        return sels;
-    },
-    markReferenced: function () {
-        var i, rules = this.rules[0].rules;
-        this.rules[0].markReferenced();
-        this.isReferenced = true;
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i].markReferenced) {
-                rules[i].markReferenced();
-            }
-        }
-    },
-
-    evalTop: function (env) {
-        var result = this;
-
-        // Render all dependent Media blocks.
-        if (env.mediaBlocks.length > 1) {
-            var selectors = this.emptySelectors();
-            result = new(tree.Ruleset)(selectors, env.mediaBlocks);
-            result.multiMedia = true;
-        }
-
-        delete env.mediaBlocks;
-        delete env.mediaPath;
-
-        return result;
-    },
-    evalNested: function (env) {
-        var i, value,
-            path = env.mediaPath.concat([this]);
-
-        // Extract the media-query conditions separated with `,` (OR).
-        for (i = 0; i < path.length; i++) {
-            value = path[i].features instanceof tree.Value ?
-                        path[i].features.value : path[i].features;
-            path[i] = Array.isArray(value) ? value : [value];
-        }
-
-        // Trace all permutations to generate the resulting media-query.
-        //
-        // (a, b and c) with nested (d, e) ->
-        //    a and d
-        //    a and e
-        //    b and c and d
-        //    b and c and e
-        this.features = new(tree.Value)(this.permute(path).map(function (path) {
-            path = path.map(function (fragment) {
-                return fragment.toCSS ? fragment : new(tree.Anonymous)(fragment);
-            });
-
-            for(i = path.length - 1; i > 0; i--) {
-                path.splice(i, 0, new(tree.Anonymous)("and"));
-            }
-
-            return new(tree.Expression)(path);
-        }));
-
-        // Fake a tree-node that doesn't output anything.
-        return new(tree.Ruleset)([], []);
-    },
-    permute: function (arr) {
-      if (arr.length === 0) {
-          return [];
-      } else if (arr.length === 1) {
-          return arr[0];
-      } else {
-          var result = [];
-          var rest = this.permute(arr.slice(1));
-          for (var i = 0; i < rest.length; i++) {
-              for (var j = 0; j < arr[0].length; j++) {
-                  result.push([arr[0][j]].concat(rest[i]));
-              }
-          }
-          return result;
-      }
-    },
-    bubbleSelectors: function (selectors) {
-      if (!selectors)
-        return;
-      this.rules = [new(tree.Ruleset)(selectors.slice(0), [this.rules[0]])];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.mixin = {};
-tree.mixin.Call = function (elements, args, index, currentFileInfo, important) {
-    this.selector = new(tree.Selector)(elements);
-    this.arguments = (args && args.length) ? args : null;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.important = important;
-};
-tree.mixin.Call.prototype = {
-    type: "MixinCall",
-    accept: function (visitor) {
-        if (this.selector) {
-            this.selector = visitor.visit(this.selector);
-        }
-        if (this.arguments) {
-            this.arguments = visitor.visitArray(this.arguments);
-        }
-    },
-    eval: function (env) {
-        var mixins, mixin, args, rules = [], match = false, i, m, f, isRecursive, isOneFound, rule,
-            candidates = [], candidate, conditionResult = [], defaultFunc = tree.defaultFunc,
-            defaultResult, defNone = 0, defTrue = 1, defFalse = 2, count, originalRuleset;
-
-        args = this.arguments && this.arguments.map(function (a) {
-            return { name: a.name, value: a.value.eval(env) };
-        });
-
-        for (i = 0; i < env.frames.length; i++) {
-            if ((mixins = env.frames[i].find(this.selector)).length > 0) {
-                isOneFound = true;
-
-                // To make `default()` function independent of definition order we have two "subpasses" here.
-                // At first we evaluate each guard *twice* (with `default() == true` and `default() == false`),
-                // and build candidate list with corresponding flags. Then, when we know all possible matches,
-                // we make a final decision.
-
-                for (m = 0; m < mixins.length; m++) {
-                    mixin = mixins[m];
-                    isRecursive = false;
-                    for(f = 0; f < env.frames.length; f++) {
-                        if ((!(mixin instanceof tree.mixin.Definition)) && mixin === (env.frames[f].originalRuleset || env.frames[f])) {
-                            isRecursive = true;
-                            break;
-                        }
-                    }
-                    if (isRecursive) {
-                        continue;
-                    }
-
-                    if (mixin.matchArgs(args, env)) {
-                        candidate = {mixin: mixin, group: defNone};
-
-                        if (mixin.matchCondition) {
-                            for (f = 0; f < 2; f++) {
-                                defaultFunc.value(f);
-                                conditionResult[f] = mixin.matchCondition(args, env);
-                            }
-                            if (conditionResult[0] || conditionResult[1]) {
-                                if (conditionResult[0] != conditionResult[1]) {
-                                    candidate.group = conditionResult[1] ?
-                                        defTrue : defFalse;
-                                }
-
-                                candidates.push(candidate);
-                            }
-                        }
-                        else {
-                            candidates.push(candidate);
-                        }
-
-                        match = true;
-                    }
-                }
-
-                defaultFunc.reset();
-
-                count = [0, 0, 0];
-                for (m = 0; m < candidates.length; m++) {
-                    count[candidates[m].group]++;
-                }
-
-                if (count[defNone] > 0) {
-                    defaultResult = defFalse;
-                } else {
-                    defaultResult = defTrue;
-                    if ((count[defTrue] + count[defFalse]) > 1) {
-                        throw { type: 'Runtime',
-                            message: 'Ambiguous use of `default()` found when matching for `'
-                                + this.format(args) + '`',
-                            index: this.index, filename: this.currentFileInfo.filename };
-                    }
-                }
-
-                for (m = 0; m < candidates.length; m++) {
-                    candidate = candidates[m].group;
-                    if ((candidate === defNone) || (candidate === defaultResult)) {
-                        try {
-                            mixin = candidates[m].mixin;
-                            if (!(mixin instanceof tree.mixin.Definition)) {
-                                originalRuleset = mixin.originalRuleset || mixin;
-                                mixin = new tree.mixin.Definition("", [], mixin.rules, null, false);
-                                mixin.originalRuleset = originalRuleset;
-                            }
-                            Array.prototype.push.apply(
-                                  rules, mixin.evalCall(env, args, this.important).rules);
-                        } catch (e) {
-                            throw { message: e.message, index: this.index, filename: this.currentFileInfo.filename, stack: e.stack };
-                        }
-                    }
-                }
-
-                if (match) {
-                    if (!this.currentFileInfo || !this.currentFileInfo.reference) {
-                        for (i = 0; i < rules.length; i++) {
-                            rule = rules[i];
-                            if (rule.markReferenced) {
-                                rule.markReferenced();
-                            }
-                        }
-                    }
-                    return rules;
-                }
-            }
-        }
-        if (isOneFound) {
-            throw { type:    'Runtime',
-                    message: 'No matching definition was found for `' + this.format(args) + '`',
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        } else {
-            throw { type:    'Name',
-                    message: this.selector.toCSS().trim() + " is undefined",
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        }
-    },
-    format: function (args) {
-        return this.selector.toCSS().trim() + '(' +
-            (args ? args.map(function (a) {
-                var argValue = "";
-                if (a.name) {
-                    argValue += a.name + ":";
-                }
-                if (a.value.toCSS) {
-                    argValue += a.value.toCSS();
-                } else {
-                    argValue += "???";
-                }
-                return argValue;
-            }).join(', ') : "") + ")";
-    }
-};
-
-tree.mixin.Definition = function (name, params, rules, condition, variadic, frames) {
-    this.name = name;
-    this.selectors = [new(tree.Selector)([new(tree.Element)(null, name, this.index, this.currentFileInfo)])];
-    this.params = params;
-    this.condition = condition;
-    this.variadic = variadic;
-    this.arity = params.length;
-    this.rules = rules;
-    this._lookups = {};
-    this.required = params.reduce(function (count, p) {
-        if (!p.name || (p.name && !p.value)) { return count + 1; }
-        else                                 { return count; }
-    }, 0);
-    this.parent = tree.Ruleset.prototype;
-    this.frames = frames;
-};
-tree.mixin.Definition.prototype = {
-    type: "MixinDefinition",
-    accept: function (visitor) {
-        if (this.params && this.params.length) {
-            this.params = visitor.visitArray(this.params);
-        }
-        this.rules = visitor.visitArray(this.rules);
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    variable:  function (name) { return this.parent.variable.call(this, name); },
-    variables: function ()     { return this.parent.variables.call(this); },
-    find:      function ()     { return this.parent.find.apply(this, arguments); },
-    rulesets:  function ()     { return this.parent.rulesets.apply(this); },
-
-    evalParams: function (env, mixinEnv, args, evaldArguments) {
-        /*jshint boss:true */
-        var frame = new(tree.Ruleset)(null, null),
-            varargs, arg,
-            params = this.params.slice(0),
-            i, j, val, name, isNamedFound, argIndex, argsLength = 0;
-
-        mixinEnv = new tree.evalEnv(mixinEnv, [frame].concat(mixinEnv.frames));
-
-        if (args) {
-            args = args.slice(0);
-            argsLength = args.length;
-
-            for(i = 0; i < argsLength; i++) {
-                arg = args[i];
-                if (name = (arg && arg.name)) {
-                    isNamedFound = false;
-                    for(j = 0; j < params.length; j++) {
-                        if (!evaldArguments[j] && name === params[j].name) {
-                            evaldArguments[j] = arg.value.eval(env);
-                            frame.prependRule(new(tree.Rule)(name, arg.value.eval(env)));
-                            isNamedFound = true;
-                            break;
-                        }
-                    }
-                    if (isNamedFound) {
-                        args.splice(i, 1);
-                        i--;
-                        continue;
-                    } else {
-                        throw { type: 'Runtime', message: "Named argument for " + this.name +
-                            ' ' + args[i].name + ' not found' };
-                    }
-                }
-            }
-        }
-        argIndex = 0;
-        for (i = 0; i < params.length; i++) {
-            if (evaldArguments[i]) { continue; }
-
-            arg = args && args[argIndex];
-
-            if (name = params[i].name) {
-                if (params[i].variadic) {
-                    varargs = [];
-                    for (j = argIndex; j < argsLength; j++) {
-                        varargs.push(args[j].value.eval(env));
-                    }
-                    frame.prependRule(new(tree.Rule)(name, new(tree.Expression)(varargs).eval(env)));
-                } else {
-                    val = arg && arg.value;
-                    if (val) {
-                        val = val.eval(env);
-                    } else if (params[i].value) {
-                        val = params[i].value.eval(mixinEnv);
-                        frame.resetCache();
-                    } else {
-                        throw { type: 'Runtime', message: "wrong number of arguments for " + this.name +
-                            ' (' + argsLength + ' for ' + this.arity + ')' };
-                    }
-
-                    frame.prependRule(new(tree.Rule)(name, val));
-                    evaldArguments[i] = val;
-                }
-            }
-
-            if (params[i].variadic && args) {
-                for (j = argIndex; j < argsLength; j++) {
-                    evaldArguments[j] = args[j].value.eval(env);
-                }
-            }
-            argIndex++;
-        }
-
-        return frame;
-    },
-    eval: function (env) {
-        return new tree.mixin.Definition(this.name, this.params, this.rules, this.condition, this.variadic, this.frames || env.frames.slice(0));
-    },
-    evalCall: function (env, args, important) {
-        var _arguments = [],
-            mixinFrames = this.frames ? this.frames.concat(env.frames) : env.frames,
-            frame = this.evalParams(env, new(tree.evalEnv)(env, mixinFrames), args, _arguments),
-            rules, ruleset;
-
-        frame.prependRule(new(tree.Rule)('@arguments', new(tree.Expression)(_arguments).eval(env)));
-
-        rules = this.rules.slice(0);
-
-        ruleset = new(tree.Ruleset)(null, rules);
-        ruleset.originalRuleset = this;
-        ruleset = ruleset.eval(new(tree.evalEnv)(env, [this, frame].concat(mixinFrames)));
-        if (important) {
-            ruleset = this.parent.makeImportant.apply(ruleset);
-        }
-        return ruleset;
-    },
-    matchCondition: function (args, env) {
-        if (this.condition && !this.condition.eval(
-            new(tree.evalEnv)(env,
-                [this.evalParams(env, new(tree.evalEnv)(env, this.frames ? this.frames.concat(env.frames) : env.frames), args, [])] // the parameter variables
-                    .concat(this.frames) // the parent namespace/mixin frames
-                    .concat(env.frames)))) { // the current environment frames
-            return false;
-        }
-        return true;
-    },
-    matchArgs: function (args, env) {
-        var argsLength = (args && args.length) || 0, len;
-
-        if (! this.variadic) {
-            if (argsLength < this.required)                               { return false; }
-            if (argsLength > this.params.length)                          { return false; }
-        } else {
-            if (argsLength < (this.required - 1))                         { return false; }
-        }
-
-        len = Math.min(argsLength, this.arity);
-
-        for (var i = 0; i < len; i++) {
-            if (!this.params[i].name && !this.params[i].variadic) {
-                if (args[i].value.eval(env).toCSS() != this.params[i].value.eval(env).toCSS()) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Negative = function (node) {
-    this.value = node;
-};
-tree.Negative.prototype = {
-    type: "Negative",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('-');
-        this.value.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (env.isMathOn()) {
-            return (new(tree.Operation)('*', [new(tree.Dimension)(-1), this.value])).eval(env);
-        }
-        return new(tree.Negative)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Operation = function (op, operands, isSpaced) {
-    this.op = op.trim();
-    this.operands = operands;
-    this.isSpaced = isSpaced;
-};
-tree.Operation.prototype = {
-    type: "Operation",
-    accept: function (visitor) {
-        this.operands = visitor.visit(this.operands);
-    },
-    eval: function (env) {
-        var a = this.operands[0].eval(env),
-            b = this.operands[1].eval(env);
-
-        if (env.isMathOn()) {
-            if (a instanceof tree.Dimension && b instanceof tree.Color) {
-                a = a.toColor();
-            }
-            if (b instanceof tree.Dimension && a instanceof tree.Color) {
-                b = b.toColor();
-            }
-            if (!a.operate) {
-                throw { type: "Operation",
-                        message: "Operation on an invalid type" };
-            }
-
-            return a.operate(env, this.op, b);
-        } else {
-            return new(tree.Operation)(this.op, [a, b], this.isSpaced);
-        }
-    },
-    genCSS: function (env, output) {
-        this.operands[0].genCSS(env, output);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        output.add(this.op);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        this.operands[1].genCSS(env, output);
-    },
-    toCSS: tree.toCSS
-};
-
-tree.operate = function (env, op, a, b) {
-    switch (op) {
-        case '+': return a + b;
-        case '-': return a - b;
-        case '*': return a * b;
-        case '/': return a / b;
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Paren = function (node) {
-    this.value = node;
-};
-tree.Paren.prototype = {
-    type: "Paren",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('(');
-        this.value.genCSS(env, output);
-        output.add(')');
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        return new(tree.Paren)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Quoted = function (str, content, escaped, index, currentFileInfo) {
-    this.escaped = escaped;
-    this.value = content || '';
-    this.quote = str.charAt(0);
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Quoted.prototype = {
-    type: "Quoted",
-    genCSS: function (env, output) {
-        if (!this.escaped) {
-            output.add(this.quote, this.currentFileInfo, this.index);
-        }
-        output.add(this.value);
-        if (!this.escaped) {
-            output.add(this.quote);
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var that = this;
-        var value = this.value.replace(/`([^`]+)`/g, function (_, exp) {
-            return new(tree.JavaScript)(exp, that.index, true).eval(env).value;
-        }).replace(/@\{([\w-]+)\}/g, function (_, name) {
-            var v = new(tree.Variable)('@' + name, that.index, that.currentFileInfo).eval(env, true);
-            return (v instanceof tree.Quoted) ? v.value : v.toCSS();
-        });
-        return new(tree.Quoted)(this.quote + value + this.quote, value, this.escaped, this.index, this.currentFileInfo);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left, right;
-
-        // when comparing quoted strings allow the quote to differ
-        if (x.type === "Quoted" && !this.escaped && !x.escaped) {
-            left = x.value;
-            right = this.value;
-        } else {
-            left = this.toCSS();
-            right = x.toCSS();
-        }
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Rule = function (name, value, important, merge, index, currentFileInfo, inline) {
-    this.name = name;
-    this.value = (value instanceof tree.Value || value instanceof tree.Ruleset) ? value : new(tree.Value)([value]);
-    this.important = important ? ' ' + important.trim() : '';
-    this.merge = merge;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.inline = inline || false;
-    this.variable = name.charAt && (name.charAt(0) === '@');
-};
-
-tree.Rule.prototype = {
-    type: "Rule",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.name + (env.compress ? ':' : ': '), this.currentFileInfo, this.index);
-        try {
-            this.value.genCSS(env, output);
-        }
-        catch(e) {
-            e.index = this.index;
-            e.filename = this.currentFileInfo.filename;
-            throw e;
-        }
-        output.add(this.important + ((this.inline || (env.lastRule && env.compress)) ? "" : ";"), this.currentFileInfo, this.index);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var strictMathBypass = false, name = this.name, evaldValue;
-        if (typeof name !== "string") {
-            // expand 'primitive' name directly to get
-            // things faster (~10% for benchmark.less):
-            name = (name.length === 1)
-                && (name[0] instanceof tree.Keyword)
-                    ? name[0].value : evalName(env, name);
-        }
-        if (name === "font" && !env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            evaldValue = this.value.eval(env);
-
-            if (!this.variable && evaldValue.type === "DetachedRuleset") {
-                throw { message: "Rulesets cannot be evaluated on a property.",
-                        index: this.index, filename: this.currentFileInfo.filename };
-            }
-
-            return new(tree.Rule)(name,
-                              evaldValue,
-                              this.important,
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline);
-        }
-        catch(e) {
-            if (typeof e.index !== 'number') {
-                e.index = this.index;
-                e.filename = this.currentFileInfo.filename;
-            }
-            throw e;
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-    },
-    makeImportant: function () {
-        return new(tree.Rule)(this.name,
-                              this.value,
-                              "!important",
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline);
-    }
-};
-
-function evalName(env, name) {
-    var value = "", i, n = name.length,
-        output = {add: function (s) {value += s;}};
-    for (i = 0; i < n; i++) {
-        name[i].eval(env).genCSS(env, output);
-    }
-    return value;
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.RulesetCall = function (variable) {
-    this.variable = variable;
-};
-tree.RulesetCall.prototype = {
-    type: "RulesetCall",
-    accept: function (visitor) {
-    },
-    eval: function (env) {
-        var detachedRuleset = new(tree.Variable)(this.variable).eval(env);
-        return detachedRuleset.callEval(env);
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Ruleset = function (selectors, rules, strictImports) {
-    this.selectors = selectors;
-    this.rules = rules;
-    this._lookups = {};
-    this.strictImports = strictImports;
-};
-tree.Ruleset.prototype = {
-    type: "Ruleset",
-    accept: function (visitor) {
-        if (this.paths) {
-            visitor.visitArray(this.paths, true);
-        } else if (this.selectors) {
-            this.selectors = visitor.visitArray(this.selectors);
-        }
-        if (this.rules && this.rules.length) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    eval: function (env) {
-        var thisSelectors = this.selectors, selectors,
-            selCnt, selector, i, defaultFunc = tree.defaultFunc, hasOnePassingSelector = false;
-
-        if (thisSelectors && (selCnt = thisSelectors.length)) {
-            selectors = [];
-            defaultFunc.error({
-                type: "Syntax",
-                message: "it is currently only allowed in parametric mixin guards,"
-            });
-            for (i = 0; i < selCnt; i++) {
-                selector = thisSelectors[i].eval(env);
-                selectors.push(selector);
-                if (selector.evaldCondition) {
-                    hasOnePassingSelector = true;
-                }
-            }
-            defaultFunc.reset();
-        } else {
-            hasOnePassingSelector = true;
-        }
-
-        var rules = this.rules ? this.rules.slice(0) : null,
-            ruleset = new(tree.Ruleset)(selectors, rules, this.strictImports),
-            rule, subRule;
-
-        ruleset.originalRuleset = this;
-        ruleset.root = this.root;
-        ruleset.firstRoot = this.firstRoot;
-        ruleset.allowImports = this.allowImports;
-
-        if(this.debugInfo) {
-            ruleset.debugInfo = this.debugInfo;
-        }
-
-        if (!hasOnePassingSelector) {
-            rules.length = 0;
-        }
-
-        // push the current ruleset to the frames stack
-        var envFrames = env.frames;
-        envFrames.unshift(ruleset);
-
-        // currrent selectors
-        var envSelectors = env.selectors;
-        if (!envSelectors) {
-            env.selectors = envSelectors = [];
-        }
-        envSelectors.unshift(this.selectors);
-
-        // Evaluate imports
-        if (ruleset.root || ruleset.allowImports || !ruleset.strictImports) {
-            ruleset.evalImports(env);
-        }
-
-        // Store the frames around mixin definitions,
-        // so they can be evaluated like closures when the time comes.
-        var rsRules = ruleset.rules, rsRuleCnt = rsRules ? rsRules.length : 0;
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Definition || rsRules[i] instanceof tree.DetachedRuleset) {
-                rsRules[i] = rsRules[i].eval(env);
-            }
-        }
-
-        var mediaBlockCount = (env.mediaBlocks && env.mediaBlocks.length) || 0;
-
-        // Evaluate mixin calls.
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Call) {
-                /*jshint loopfunc:true */
-                rules = rsRules[i].eval(env).filter(function(r) {
-                    if ((r instanceof tree.Rule) && r.variable) {
-                        // do not pollute the scope if the variable is
-                        // already there. consider returning false here
-                        // but we need a way to "return" variable from mixins
-                        return !(ruleset.variable(r.name));
-                    }
-                    return true;
-                });
-                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
-                rsRuleCnt += rules.length - 1;
-                i += rules.length-1;
-                ruleset.resetCache();
-            } else if (rsRules[i] instanceof tree.RulesetCall) {
-                /*jshint loopfunc:true */
-                rules = rsRules[i].eval(env).rules.filter(function(r) {
-                    if ((r instanceof tree.Rule) && r.variable) {
-                        // do not pollute the scope at all
-                        return false;
-                    }
-                    return true;
-                });
-                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
-                rsRuleCnt += rules.length - 1;
-                i += rules.length-1;
-                ruleset.resetCache();
-            }
-        }
-
-        // Evaluate everything else
-        for (i = 0; i < rsRules.length; i++) {
-            rule = rsRules[i];
-            if (! (rule instanceof tree.mixin.Definition || rule instanceof tree.DetachedRuleset)) {
-                rsRules[i] = rule = rule.eval ? rule.eval(env) : rule;
-            }
-        }
-
-        // Evaluate everything else
-        for (i = 0; i < rsRules.length; i++) {
-            rule = rsRules[i];
-            // for rulesets, check if it is a css guard and can be removed
-            if (rule instanceof tree.Ruleset && rule.selectors && rule.selectors.length === 1) {
-                // check if it can be folded in (e.g. & where)
-                if (rule.selectors[0].isJustParentSelector()) {
-                    rsRules.splice(i--, 1);
-
-                    for(var j = 0; j < rule.rules.length; j++) {
-                        subRule = rule.rules[j];
-                        if (!(subRule instanceof tree.Rule) || !subRule.variable) {
-                            rsRules.splice(++i, 0, subRule);
-                        }
-                    }
-                }
-            }
-        }
-
-        // Pop the stack
-        envFrames.shift();
-        envSelectors.shift();
-
-        if (env.mediaBlocks) {
-            for (i = mediaBlockCount; i < env.mediaBlocks.length; i++) {
-                env.mediaBlocks[i].bubbleSelectors(selectors);
-            }
-        }
-
-        return ruleset;
-    },
-    evalImports: function(env) {
-        var rules = this.rules, i, importRules;
-        if (!rules) { return; }
-
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i] instanceof tree.Import) {
-                importRules = rules[i].eval(env);
-                if (importRules && importRules.length) {
-                    rules.splice.apply(rules, [i, 1].concat(importRules));
-                    i+= importRules.length-1;
-                } else {
-                    rules.splice(i, 1, importRules);
-                }
-                this.resetCache();
-            }
-        }
-    },
-    makeImportant: function() {
-        return new tree.Ruleset(this.selectors, this.rules.map(function (r) {
-                    if (r.makeImportant) {
-                        return r.makeImportant();
-                    } else {
-                        return r;
-                    }
-                }), this.strictImports);
-    },
-    matchArgs: function (args) {
-        return !args || args.length === 0;
-    },
-    // lets you call a css selector with a guard
-    matchCondition: function (args, env) {
-        var lastSelector = this.selectors[this.selectors.length-1];
-        if (!lastSelector.evaldCondition) {
-            return false;
-        }
-        if (lastSelector.condition &&
-            !lastSelector.condition.eval(
-                new(tree.evalEnv)(env,
-                    env.frames))) {
-            return false;
-        }
-        return true;
-    },
-    resetCache: function () {
-        this._rulesets = null;
-        this._variables = null;
-        this._lookups = {};
-    },
-    variables: function () {
-        if (!this._variables) {
-            this._variables = !this.rules ? {} : this.rules.reduce(function (hash, r) {
-                if (r instanceof tree.Rule && r.variable === true) {
-                    hash[r.name] = r;
-                }
-                return hash;
-            }, {});
-        }
-        return this._variables;
-    },
-    variable: function (name) {
-        return this.variables()[name];
-    },
-    rulesets: function () {
-        if (!this.rules) { return null; }
-
-        var _Ruleset = tree.Ruleset, _MixinDefinition = tree.mixin.Definition,
-            filtRules = [], rules = this.rules, cnt = rules.length,
-            i, rule;
-
-        for (i = 0; i < cnt; i++) {
-            rule = rules[i];
-            if ((rule instanceof _Ruleset) || (rule instanceof _MixinDefinition)) {
-                filtRules.push(rule);
-            }
-        }
-
-        return filtRules;
-    },
-    prependRule: function (rule) {
-        var rules = this.rules;
-        if (rules) { rules.unshift(rule); } else { this.rules = [ rule ]; }
-    },
-    find: function (selector, self) {
-        self = self || this;
-        var rules = [], match,
-            key = selector.toCSS();
-
-        if (key in this._lookups) { return this._lookups[key]; }
-
-        this.rulesets().forEach(function (rule) {
-            if (rule !== self) {
-                for (var j = 0; j < rule.selectors.length; j++) {
-                    match = selector.match(rule.selectors[j]);
-                    if (match) {
-                        if (selector.elements.length > match) {
-                            Array.prototype.push.apply(rules, rule.find(
-                                new(tree.Selector)(selector.elements.slice(match)), self));
-                        } else {
-                            rules.push(rule);
-                        }
-                        break;
-                    }
-                }
-            }
-        });
-        this._lookups[key] = rules;
-        return rules;
-    },
-    genCSS: function (env, output) {
-        var i, j,
-            ruleNodes = [],
-            rulesetNodes = [],
-            rulesetNodeCnt,
-            debugInfo,     // Line number debugging
-            rule,
-            path;
-
-        env.tabLevel = (env.tabLevel || 0);
-
-        if (!this.root) {
-            env.tabLevel++;
-        }
-
-        var tabRuleStr = env.compress ? '' : Array(env.tabLevel + 1).join("  "),
-            tabSetStr = env.compress ? '' : Array(env.tabLevel).join("  "),
-            sep;
-
-        for (i = 0; i < this.rules.length; i++) {
-            rule = this.rules[i];
-            if (rule.rules || (rule instanceof tree.Media) || rule instanceof tree.Directive || (this.root && rule instanceof tree.Comment)) {
-                rulesetNodes.push(rule);
-            } else {
-                ruleNodes.push(rule);
-            }
-        }
-
-        // If this is the root node, we don't render
-        // a selector, or {}.
-        if (!this.root) {
-            debugInfo = tree.debugInfo(env, this, tabSetStr);
-
-            if (debugInfo) {
-                output.add(debugInfo);
-                output.add(tabSetStr);
-            }
-
-            var paths = this.paths, pathCnt = paths.length,
-                pathSubCnt;
-
-            sep = env.compress ? ',' : (',\n' + tabSetStr);
-
-            for (i = 0; i < pathCnt; i++) {
-                path = paths[i];
-                if (!(pathSubCnt = path.length)) { continue; }
-                if (i > 0) { output.add(sep); }
-
-                env.firstSelector = true;
-                path[0].genCSS(env, output);
-
-                env.firstSelector = false;
-                for (j = 1; j < pathSubCnt; j++) {
-                    path[j].genCSS(env, output);
-                }
-            }
-
-            output.add((env.compress ? '{' : ' {\n') + tabRuleStr);
-        }
-
-        // Compile rules and rulesets
-        for (i = 0; i < ruleNodes.length; i++) {
-            rule = ruleNodes[i];
-
-            // @page{ directive ends up with root elements inside it, a mix of rules and rulesets
-            // In this instance we do not know whether it is the last property
-            if (i + 1 === ruleNodes.length && (!this.root || rulesetNodes.length === 0 || this.firstRoot)) {
-                env.lastRule = true;
-            }
-
-            if (rule.genCSS) {
-                rule.genCSS(env, output);
-            } else if (rule.value) {
-                output.add(rule.value.toString());
-            }
-
-            if (!env.lastRule) {
-                output.add(env.compress ? '' : ('\n' + tabRuleStr));
-            } else {
-                env.lastRule = false;
-            }
-        }
-
-        if (!this.root) {
-            output.add((env.compress ? '}' : '\n' + tabSetStr + '}'));
-            env.tabLevel--;
-        }
-
-        sep = (env.compress ? "" : "\n") + (this.root ? tabRuleStr : tabSetStr);
-        rulesetNodeCnt = rulesetNodes.length;
-        if (rulesetNodeCnt) {
-            if (ruleNodes.length && sep) { output.add(sep); }
-            rulesetNodes[0].genCSS(env, output);
-            for (i = 1; i < rulesetNodeCnt; i++) {
-                if (sep) { output.add(sep); }
-                rulesetNodes[i].genCSS(env, output);
-            }
-        }
-
-        if (!output.isEmpty() && !env.compress && this.firstRoot) {
-            output.add('\n');
-        }
-    },
-
-    toCSS: tree.toCSS,
-
-    markReferenced: function () {
-        if (!this.selectors) {
-            return;
-        }
-        for (var s = 0; s < this.selectors.length; s++) {
-            this.selectors[s].markReferenced();
-        }
-    },
-
-    joinSelectors: function (paths, context, selectors) {
-        for (var s = 0; s < selectors.length; s++) {
-            this.joinSelector(paths, context, selectors[s]);
-        }
-    },
-
-    joinSelector: function (paths, context, selector) {
-
-        var i, j, k,
-            hasParentSelector, newSelectors, el, sel, parentSel,
-            newSelectorPath, afterParentJoin, newJoinedSelector,
-            newJoinedSelectorEmpty, lastSelector, currentElements,
-            selectorsMultiplied;
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            if (el.value === '&') {
-                hasParentSelector = true;
-            }
-        }
-
-        if (!hasParentSelector) {
-            if (context.length > 0) {
-                for (i = 0; i < context.length; i++) {
-                    paths.push(context[i].concat(selector));
-                }
-            }
-            else {
-                paths.push([selector]);
-            }
-            return;
-        }
-
-        // The paths are [[Selector]]
-        // The first list is a list of comma seperated selectors
-        // The inner list is a list of inheritance seperated selectors
-        // e.g.
-        // .a, .b {
-        //   .c {
-        //   }
-        // }
-        // == [[.a] [.c]] [[.b] [.c]]
-        //
-
-        // the elements from the current selector so far
-        currentElements = [];
-        // the current list of new selectors to add to the path.
-        // We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
-        // by the parents
-        newSelectors = [[]];
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            // non parent reference elements just get added
-            if (el.value !== "&") {
-                currentElements.push(el);
-            } else {
-                // the new list of selectors to add
-                selectorsMultiplied = [];
-
-                // merge the current list of non parent selector elements
-                // on to the current list of selectors to add
-                if (currentElements.length > 0) {
-                    this.mergeElementsOnToSelectors(currentElements, newSelectors);
-                }
-
-                // loop through our current selectors
-                for (j = 0; j < newSelectors.length; j++) {
-                    sel = newSelectors[j];
-                    // if we don't have any parent paths, the & might be in a mixin so that it can be used
-                    // whether there are parents or not
-                    if (context.length === 0) {
-                        // the combinator used on el should now be applied to the next element instead so that
-                        // it is not lost
-                        if (sel.length > 0) {
-                            sel[0].elements = sel[0].elements.slice(0);
-                            sel[0].elements.push(new(tree.Element)(el.combinator, '', el.index, el.currentFileInfo));
-                        }
-                        selectorsMultiplied.push(sel);
-                    }
-                    else {
-                        // and the parent selectors
-                        for (k = 0; k < context.length; k++) {
-                            parentSel = context[k];
-                            // We need to put the current selectors
-                            // then join the last selector's elements on to the parents selectors
-
-                            // our new selector path
-                            newSelectorPath = [];
-                            // selectors from the parent after the join
-                            afterParentJoin = [];
-                            newJoinedSelectorEmpty = true;
-
-                            //construct the joined selector - if & is the first thing this will be empty,
-                            // if not newJoinedSelector will be the last set of elements in the selector
-                            if (sel.length > 0) {
-                                newSelectorPath = sel.slice(0);
-                                lastSelector = newSelectorPath.pop();
-                                newJoinedSelector = selector.createDerived(lastSelector.elements.slice(0));
-                                newJoinedSelectorEmpty = false;
-                            }
-                            else {
-                                newJoinedSelector = selector.createDerived([]);
-                            }
-
-                            //put together the parent selectors after the join
-                            if (parentSel.length > 1) {
-                                afterParentJoin = afterParentJoin.concat(parentSel.slice(1));
-                            }
-
-                            if (parentSel.length > 0) {
-                                newJoinedSelectorEmpty = false;
-
-                                // join the elements so far with the first part of the parent
-                                newJoinedSelector.elements.push(new(tree.Element)(el.combinator, parentSel[0].elements[0].value, el.index, el.currentFileInfo));
-                                newJoinedSelector.elements = newJoinedSelector.elements.concat(parentSel[0].elements.slice(1));
-                            }
-
-                            if (!newJoinedSelectorEmpty) {
-                                // now add the joined selector
-                                newSelectorPath.push(newJoinedSelector);
-                            }
-
-                            // and the rest of the parent
-                            newSelectorPath = newSelectorPath.concat(afterParentJoin);
-
-                            // add that to our new set of selectors
-                            selectorsMultiplied.push(newSelectorPath);
-                        }
-                    }
-                }
-
-                // our new selectors has been multiplied, so reset the state
-                newSelectors = selectorsMultiplied;
-                currentElements = [];
-            }
-        }
-
-        // if we have any elements left over (e.g. .a& .b == .b)
-        // add them on to all the current selectors
-        if (currentElements.length > 0) {
-            this.mergeElementsOnToSelectors(currentElements, newSelectors);
-        }
-
-        for (i = 0; i < newSelectors.length; i++) {
-            if (newSelectors[i].length > 0) {
-                paths.push(newSelectors[i]);
-            }
-        }
-    },
-
-    mergeElementsOnToSelectors: function(elements, selectors) {
-        var i, sel;
-
-        if (selectors.length === 0) {
-            selectors.push([ new(tree.Selector)(elements) ]);
-            return;
-        }
-
-        for (i = 0; i < selectors.length; i++) {
-            sel = selectors[i];
-
-            // if the previous thing in sel is a parent this needs to join on to it
-            if (sel.length > 0) {
-                sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));
-            }
-            else {
-                sel.push(new(tree.Selector)(elements));
-            }
-        }
-    }
-};
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Selector = function (elements, extendList, condition, index, currentFileInfo, isReferenced) {
-    this.elements = elements;
-    this.extendList = extendList;
-    this.condition = condition;
-    this.currentFileInfo = currentFileInfo || {};
-    this.isReferenced = isReferenced;
-    if (!condition) {
-        this.evaldCondition = true;
-    }
-};
-tree.Selector.prototype = {
-    type: "Selector",
-    accept: function (visitor) {
-        if (this.elements) {
-            this.elements = visitor.visitArray(this.elements);
-        }
-        if (this.extendList) {
-            this.extendList = visitor.visitArray(this.extendList);
-        }
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    createDerived: function(elements, extendList, evaldCondition) {
-        evaldCondition = (evaldCondition != null) ? evaldCondition : this.evaldCondition;
-        var newSelector = new(tree.Selector)(elements, extendList || this.extendList, null, this.index, this.currentFileInfo, this.isReferenced);
-        newSelector.evaldCondition = evaldCondition;
-        newSelector.mediaEmpty = this.mediaEmpty;
-        return newSelector;
-    },
-    match: function (other) {
-        var elements = this.elements,
-            len = elements.length,
-            olen, i;
-
-        other.CacheElements();
-
-        olen = other._elements.length;
-        if (olen === 0 || len < olen) {
-            return 0;
-        } else {
-            for (i = 0; i < olen; i++) {
-                if (elements[i].value !== other._elements[i]) {
-                    return 0;
-                }
-            }
-        }
-
-        return olen; // return number of matched elements
-    },
-    CacheElements: function(){
-        var css = '', len, v, i;
-
-        if( !this._elements ){
-
-            len = this.elements.length;
-            for(i = 0; i < len; i++){
-
-                v = this.elements[i];
-                css += v.combinator.value;
-
-                if( !v.value.value ){
-                    css += v.value;
-                    continue;
-                }
-
-                if( typeof v.value.value !== "string" ){
-                    css = '';
-                    break;
-                }
-                css += v.value.value;
-            }
-
-            this._elements = css.match(/[,&#\.\w-]([\w-]|(\\.))*/g);
-
-            if (this._elements) {
-                if (this._elements[0] === "&") {
-                    this._elements.shift();
-                }
-
-            } else {
-                this._elements = [];
-            }
-
-        }
-    },
-    isJustParentSelector: function() {
-        return !this.mediaEmpty &&
-            this.elements.length === 1 &&
-            this.elements[0].value === '&' &&
-            (this.elements[0].combinator.value === ' ' || this.elements[0].combinator.value === '');
-    },
-    eval: function (env) {
-        var evaldCondition = this.condition && this.condition.eval(env),
-            elements = this.elements, extendList = this.extendList;
-
-        elements = elements && elements.map(function (e) { return e.eval(env); });
-        extendList = extendList && extendList.map(function(extend) { return extend.eval(env); });
-
-        return this.createDerived(elements, extendList, evaldCondition);
-    },
-    genCSS: function (env, output) {
-        var i, element;
-        if ((!env || !env.firstSelector) && this.elements[0].combinator.value === "") {
-            output.add(' ', this.currentFileInfo, this.index);
-        }
-        if (!this._css) {
-            //TODO caching? speed comparison?
-            for(i = 0; i < this.elements.length; i++) {
-                element = this.elements[i];
-                element.genCSS(env, output);
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    markReferenced: function () {
-        this.isReferenced = true;
-    },
-    getIsReferenced: function() {
-        return !this.currentFileInfo.reference || this.isReferenced;
-    },
-    getIsOutput: function() {
-        return this.evaldCondition;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.UnicodeDescriptor = function (value) {
-    this.value = value;
-};
-tree.UnicodeDescriptor.prototype = {
-    type: "UnicodeDescriptor",
-    genCSS: function (env, output) {
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    eval: function () { return this; }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.URL = function (val, currentFileInfo, isEvald) {
-    this.value = val;
-    this.currentFileInfo = currentFileInfo;
-    this.isEvald = isEvald;
-};
-tree.URL.prototype = {
-    type: "Url",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add("url(");
-        this.value.genCSS(env, output);
-        output.add(")");
-    },
-    toCSS: tree.toCSS,
-    eval: function (ctx) {
-        var val = this.value.eval(ctx),
-            rootpath;
-
-        if (!this.isEvald) {
-            // Add the base path if the URL is relative
-            rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-            if (rootpath && typeof val.value === "string" && ctx.isPathRelative(val.value)) {
-                if (!val.quote) {
-                    rootpath = rootpath.replace(/[\(\)'"\s]/g, function(match) { return "\\"+match; });
-                }
-                val.value = rootpath + val.value;
-            }
-
-            val.value = ctx.normalizePath(val.value);
-
-            // Add url args if enabled
-            if (ctx.urlArgs) {
-                if (!val.value.match(/^\s*data:/)) {
-                    var delimiter = val.value.indexOf('?') === -1 ? '?' : '&';
-                    var urlArgs = delimiter + ctx.urlArgs;
-                    if (val.value.indexOf('#') !== -1) {
-                        val.value = val.value.replace('#', urlArgs + '#');
-                    } else {
-                        val.value += urlArgs;
-                    }
-                }
-            }
-        }
-
-        return new(tree.URL)(val, this.currentFileInfo, true);
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Value = function (value) {
-    this.value = value;
-};
-tree.Value.prototype = {
-    type: "Value",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        if (this.value.length === 1) {
-            return this.value[0].eval(env);
-        } else {
-            return new(tree.Value)(this.value.map(function (v) {
-                return v.eval(env);
-            }));
-        }
-    },
-    genCSS: function (env, output) {
-        var i;
-        for(i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i+1 < this.value.length) {
-                output.add((env && env.compress) ? ',' : ', ');
-            }
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Variable = function (name, index, currentFileInfo) {
-    this.name = name;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo || {};
-};
-tree.Variable.prototype = {
-    type: "Variable",
-    eval: function (env) {
-        var variable, name = this.name;
-
-        if (name.indexOf('@@') === 0) {
-            name = '@' + new(tree.Variable)(name.slice(1)).eval(env).value;
-        }
-
-        if (this.evaluating) {
-            throw { type: 'Name',
-                    message: "Recursive variable definition for " + name,
-                    filename: this.currentFileInfo.file,
-                    index: this.index };
-        }
-
-        this.evaluating = true;
-
-        variable = tree.find(env.frames, function (frame) {
-            var v = frame.variable(name);
-            if (v) {
-                return v.value.eval(env);
-            }
-        });
-        if (variable) {
-            this.evaluating = false;
-            return variable;
-        } else {
-            throw { type: 'Name',
-                    message: "variable " + name + " is undefined",
-                    filename: this.currentFileInfo.filename,
-                    index: this.index };
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-    var parseCopyProperties = [
-        'paths',            // option - unmodified - paths to search for imports on
-        'optimization',     // option - optimization level (for the chunker)
-        'files',            // list of files that have been imported, used for import-once
-        'contents',         // map - filename to contents of all the files
-        'contentsIgnoredChars', // map - filename to lines at the begining of each file to ignore
-        'relativeUrls',     // option - whether to adjust URL's to be relative
-        'rootpath',         // option - rootpath to append to URL's
-        'strictImports',    // option -
-        'insecure',         // option - whether to allow imports from insecure ssl hosts
-        'dumpLineNumbers',  // option - whether to dump line numbers
-        'compress',         // option - whether to compress
-        'processImports',   // option - whether to process imports. if false then imports will not be imported
-        'syncImport',       // option - whether to import synchronously
-        'javascriptEnabled',// option - whether JavaScript is enabled. if undefined, defaults to true
-        'mime',             // browser only - mime type for sheet import
-        'useFileCache',     // browser only - whether to use the per file session cache
-        'currentFileInfo'   // information about the current file - for error reporting and importing and making urls relative etc.
-    ];
-
-    //currentFileInfo = {
-    //  'relativeUrls' - option - whether to adjust URL's to be relative
-    //  'filename' - full resolved filename of current file
-    //  'rootpath' - path to append to normal URLs for this node
-    //  'currentDirectory' - path to the current file, absolute
-    //  'rootFilename' - filename of the base file
-    //  'entryPath' - absolute path to the entry file
-    //  'reference' - whether the file should not be output and only output parts that are referenced
-
-    tree.parseEnv = function(options) {
-        copyFromOriginal(options, this, parseCopyProperties);
-
-        if (!this.contents) { this.contents = {}; }
-        if (!this.contentsIgnoredChars) { this.contentsIgnoredChars = {}; }
-        if (!this.files) { this.files = {}; }
-
-        if (!this.currentFileInfo) {
-            var filename = (options && options.filename) || "input";
-            var entryPath = filename.replace(/[^\/\\]*$/, "");
-            if (options) {
-                options.filename = null;
-            }
-            this.currentFileInfo = {
-                filename: filename,
-                relativeUrls: this.relativeUrls,
-                rootpath: (options && options.rootpath) || "",
-                currentDirectory: entryPath,
-                entryPath: entryPath,
-                rootFilename: filename
-            };
-        }
-    };
-
-    var evalCopyProperties = [
-        'silent',         // whether to swallow errors and warnings
-        'verbose',        // whether to log more activity
-        'compress',       // whether to compress
-        'yuicompress',    // whether to compress with the outside tool yui compressor
-        'ieCompat',       // whether to enforce IE compatibility (IE8 data-uri)
-        'strictMath',     // whether math has to be within parenthesis
-        'strictUnits',    // whether units need to evaluate correctly
-        'cleancss',       // whether to compress with clean-css
-        'sourceMap',      // whether to output a source map
-        'importMultiple', // whether we are currently importing multiple copies
-        'urlArgs'         // whether to add args into url tokens
-        ];
-
-    tree.evalEnv = function(options, frames) {
-        copyFromOriginal(options, this, evalCopyProperties);
-
-        this.frames = frames || [];
-    };
-
-    tree.evalEnv.prototype.inParenthesis = function () {
-        if (!this.parensStack) {
-            this.parensStack = [];
-        }
-        this.parensStack.push(true);
-    };
-
-    tree.evalEnv.prototype.outOfParenthesis = function () {
-        this.parensStack.pop();
-    };
-
-    tree.evalEnv.prototype.isMathOn = function () {
-        return this.strictMath ? (this.parensStack && this.parensStack.length) : true;
-    };
-
-    tree.evalEnv.prototype.isPathRelative = function (path) {
-        return !/^(?:[a-z-]+:|\/)/.test(path);
-    };
-
-    tree.evalEnv.prototype.normalizePath = function( path ) {
-        var
-          segments = path.split("/").reverse(),
-          segment;
-
-        path = [];
-        while (segments.length !== 0 ) {
-            segment = segments.pop();
-            switch( segment ) {
-                case ".":
-                    break;
-                case "..":
-                    if ((path.length === 0) || (path[path.length - 1] === "..")) {
-                        path.push( segment );
-                    } else {
-                        path.pop();
-                    }
-                    break;
-                default:
-                    path.push( segment );
-                    break;
-            }
-        }
-
-        return path.join("/");
-    };
-
-    //todo - do the same for the toCSS env
-    //tree.toCSSEnv = function (options) {
-    //};
-
-    var copyFromOriginal = function(original, destination, propertiesToCopy) {
-        if (!original) { return; }
-
-        for(var i = 0; i < propertiesToCopy.length; i++) {
-            if (original.hasOwnProperty(propertiesToCopy[i])) {
-                destination[propertiesToCopy[i]] = original[propertiesToCopy[i]];
-            }
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    var _visitArgs = { visitDeeper: true },
-        _hasIndexed = false;
-
-    function _noop(node) {
-        return node;
-    }
-
-    function indexNodeTypes(parent, ticker) {
-        // add .typeIndex to tree node types for lookup table
-        var key, child;
-        for (key in parent) {
-            if (parent.hasOwnProperty(key)) {
-                child = parent[key];
-                switch (typeof child) {
-                    case "function":
-                        // ignore bound functions directly on tree which do not have a prototype
-                        // or aren't nodes
-                        if (child.prototype && child.prototype.type) {
-                            child.prototype.typeIndex = ticker++;
-                        }
-                        break;
-                    case "object":
-                        ticker = indexNodeTypes(child, ticker);
-                        break;
-                }
-            }
-        }
-        return ticker;
-    }
-
-    tree.visitor = function(implementation) {
-        this._implementation = implementation;
-        this._visitFnCache = [];
-
-        if (!_hasIndexed) {
-            indexNodeTypes(tree, 1);
-            _hasIndexed = true;
-        }
-    };
-
-    tree.visitor.prototype = {
-        visit: function(node) {
-            if (!node) {
-                return node;
-            }
-
-            var nodeTypeIndex = node.typeIndex;
-            if (!nodeTypeIndex) {
-                return node;
-            }
-
-            var visitFnCache = this._visitFnCache,
-                impl = this._implementation,
-                aryIndx = nodeTypeIndex << 1,
-                outAryIndex = aryIndx | 1,
-                func = visitFnCache[aryIndx],
-                funcOut = visitFnCache[outAryIndex],
-                visitArgs = _visitArgs,
-                fnName;
-
-            visitArgs.visitDeeper = true;
-
-            if (!func) {
-                fnName = "visit" + node.type;
-                func = impl[fnName] || _noop;
-                funcOut = impl[fnName + "Out"] || _noop;
-                visitFnCache[aryIndx] = func;
-                visitFnCache[outAryIndex] = funcOut;
-            }
-
-            if (func !== _noop) {
-                var newNode = func.call(impl, node, visitArgs);
-                if (impl.isReplacing) {
-                    node = newNode;
-                }
-            }
-
-            if (visitArgs.visitDeeper && node && node.accept) {
-                node.accept(this);
-            }
-
-            if (funcOut != _noop) {
-                funcOut.call(impl, node);
-            }
-
-            return node;
-        },
-        visitArray: function(nodes, nonReplacing) {
-            if (!nodes) {
-                return nodes;
-            }
-
-            var cnt = nodes.length, i;
-
-            // Non-replacing
-            if (nonReplacing || !this._implementation.isReplacing) {
-                for (i = 0; i < cnt; i++) {
-                    this.visit(nodes[i]);
-                }
-                return nodes;
-            }
-
-            // Replacing
-            var out = [];
-            for (i = 0; i < cnt; i++) {
-                var evald = this.visit(nodes[i]);
-                if (!evald.splice) {
-                    out.push(evald);
-                } else if (evald.length) {
-                    this.flatten(evald, out);
-                }
-            }
-            return out;
-        },
-        flatten: function(arr, out) {
-            if (!out) {
-                out = [];
-            }
-
-            var cnt, i, item,
-                nestedCnt, j, nestedItem;
-
-            for (i = 0, cnt = arr.length; i < cnt; i++) {
-                item = arr[i];
-                if (!item.splice) {
-                    out.push(item);
-                    continue;
-                }
-
-                for (j = 0, nestedCnt = item.length; j < nestedCnt; j++) {
-                    nestedItem = item[j];
-                    if (!nestedItem.splice) {
-                        out.push(nestedItem);
-                    } else if (nestedItem.length) {
-                        this.flatten(nestedItem, out);
-                    }
-                }
-            }
-
-            return out;
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.importVisitor = function(importer, finish, evalEnv, onceFileDetectionMap, recursionDetector) {
-        this._visitor = new tree.visitor(this);
-        this._importer = importer;
-        this._finish = finish;
-        this.env = evalEnv || new tree.evalEnv();
-        this.importCount = 0;
-        this.onceFileDetectionMap = onceFileDetectionMap || {};
-        this.recursionDetector = {};
-        if (recursionDetector) {
-            for(var fullFilename in recursionDetector) {
-                if (recursionDetector.hasOwnProperty(fullFilename)) {
-                    this.recursionDetector[fullFilename] = true;
-                }
-            }
-        }
-    };
-
-    tree.importVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            var error;
-            try {
-                // process the contents
-                this._visitor.visit(root);
-            }
-            catch(e) {
-                error = e;
-            }
-
-            this.isFinished = true;
-
-            if (this.importCount === 0) {
-                this._finish(error);
-            }
-        },
-        visitImport: function (importNode, visitArgs) {
-            var importVisitor = this,
-                evaldImportNode,
-                inlineCSS = importNode.options.inline;
-
-            if (!importNode.css || inlineCSS) {
-
-                try {
-                    evaldImportNode = importNode.evalForImport(this.env);
-                } catch(e){
-                    if (!e.filename) { e.index = importNode.index; e.filename = importNode.currentFileInfo.filename; }
-                    // attempt to eval properly and treat as css
-                    importNode.css = true;
-                    // if that fails, this error will be thrown
-                    importNode.error = e;
-                }
-
-                if (evaldImportNode && (!evaldImportNode.css || inlineCSS)) {
-                    importNode = evaldImportNode;
-                    this.importCount++;
-                    var env = new tree.evalEnv(this.env, this.env.frames.slice(0));
-
-                    if (importNode.options.multiple) {
-                        env.importMultiple = true;
-                    }
-
-                    this._importer.push(importNode.getPath(), importNode.currentFileInfo, importNode.options, function (e, root, importedAtRoot, fullPath) {
-                        if (e && !e.filename) { e.index = importNode.index; e.filename = importNode.currentFileInfo.filename; }
-
-                        if (!env.importMultiple) {
-                            if (importedAtRoot) {
-                                importNode.skip = true;
-                            } else {
-                                importNode.skip = function() {
-                                    if (fullPath in importVisitor.onceFileDetectionMap) {
-                                        return true;
-                                    }
-                                    importVisitor.onceFileDetectionMap[fullPath] = true;
-                                    return false;
-                                };
-                            }
-                        }
-
-                        var subFinish = function(e) {
-                            importVisitor.importCount--;
-
-                            if (importVisitor.importCount === 0 && importVisitor.isFinished) {
-                                importVisitor._finish(e);
-                            }
-                        };
-
-                        if (root) {
-                            importNode.root = root;
-                            importNode.importedFilename = fullPath;
-                            var duplicateImport = importedAtRoot || fullPath in importVisitor.recursionDetector;
-
-                            if (!inlineCSS && (env.importMultiple || !duplicateImport)) {
-                                importVisitor.recursionDetector[fullPath] = true;
-                                new(tree.importVisitor)(importVisitor._importer, subFinish, env, importVisitor.onceFileDetectionMap, importVisitor.recursionDetector)
-                                    .run(root);
-                                return;
-                            }
-                        }
-
-                        subFinish();
-                    });
-                }
-            }
-            visitArgs.visitDeeper = false;
-            return importNode;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-            return ruleNode;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            this.env.frames.unshift(directiveNode);
-            return directiveNode;
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.env.frames.shift();
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            this.env.frames.unshift(mixinDefinitionNode);
-            return mixinDefinitionNode;
-        },
-        visitMixinDefinitionOut: function (mixinDefinitionNode) {
-            this.env.frames.shift();
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            this.env.frames.unshift(rulesetNode);
-            return rulesetNode;
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.env.frames.shift();
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            this.env.frames.unshift(mediaNode.ruleset);
-            return mediaNode;
-        },
-        visitMediaOut: function (mediaNode) {
-            this.env.frames.shift();
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.joinSelectorVisitor = function() {
-        this.contexts = [[]];
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.joinSelectorVisitor.prototype = {
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1],
-                paths = [], selectors;
-
-            this.contexts.push(paths);
-
-            if (! rulesetNode.root) {
-                selectors = rulesetNode.selectors;
-                if (selectors) {
-                    selectors = selectors.filter(function(selector) { return selector.getIsOutput(); });
-                    rulesetNode.selectors = selectors.length ? selectors : (selectors = null);
-                    if (selectors) { rulesetNode.joinSelectors(paths, context, selectors); }
-                }
-                if (!selectors) { rulesetNode.rules = null; }
-                rulesetNode.paths = paths;
-            }
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.contexts.length = this.contexts.length - 1;
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1];
-            mediaNode.rules[0].root = (context.length === 0 || context[0].multiMedia);
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.toCSSVisitor = function(env) {
-        this._visitor = new tree.visitor(this);
-        this._env = env;
-    };
-
-    tree.toCSSVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-
-        visitRule: function (ruleNode, visitArgs) {
-            if (ruleNode.variable) {
-                return [];
-            }
-            return ruleNode;
-        },
-
-        visitMixinDefinition: function (mixinNode, visitArgs) {
-            // mixin definitions do not get eval'd - this means they keep state
-            // so we have to clear that state here so it isn't used if toCSS is called twice
-            mixinNode.frames = [];
-            return [];
-        },
-
-        visitExtend: function (extendNode, visitArgs) {
-            return [];
-        },
-
-        visitComment: function (commentNode, visitArgs) {
-            if (commentNode.isSilent(this._env)) {
-                return [];
-            }
-            return commentNode;
-        },
-
-        visitMedia: function(mediaNode, visitArgs) {
-            mediaNode.accept(this._visitor);
-            visitArgs.visitDeeper = false;
-
-            if (!mediaNode.rules.length) {
-                return [];
-            }
-            return mediaNode;
-        },
-
-        visitDirective: function(directiveNode, visitArgs) {
-            if (directiveNode.currentFileInfo.reference && !directiveNode.isReferenced) {
-                return [];
-            }
-            if (directiveNode.name === "@charset") {
-                // Only output the debug info together with subsequent @charset definitions
-                // a comment (or @media statement) before the actual @charset directive would
-                // be considered illegal css as it has to be on the first line
-                if (this.charset) {
-                    if (directiveNode.debugInfo) {
-                        var comment = new tree.Comment("/* " + directiveNode.toCSS(this._env).replace(/\n/g, "")+" */\n");
-                        comment.debugInfo = directiveNode.debugInfo;
-                        return this._visitor.visit(comment);
-                    }
-                    return [];
-                }
-                this.charset = true;
-            }
-            return directiveNode;
-        },
-
-        checkPropertiesInRoot: function(rules) {
-            var ruleNode;
-            for(var i = 0; i < rules.length; i++) {
-                ruleNode = rules[i];
-                if (ruleNode instanceof tree.Rule && !ruleNode.variable) {
-                    throw { message: "properties must be inside selector blocks, they cannot be in the root.",
-                        index: ruleNode.index, filename: ruleNode.currentFileInfo ? ruleNode.currentFileInfo.filename : null};
-                }
-            }
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var rule, rulesets = [];
-            if (rulesetNode.firstRoot) {
-                this.checkPropertiesInRoot(rulesetNode.rules);
-            }
-            if (! rulesetNode.root) {
-                if (rulesetNode.paths) {
-                    rulesetNode.paths = rulesetNode.paths
-                        .filter(function(p) {
-                            var i;
-                            if (p[0].elements[0].combinator.value === ' ') {
-                                p[0].elements[0].combinator = new(tree.Combinator)('');
-                            }
-                            for(i = 0; i < p.length; i++) {
-                                if (p[i].getIsReferenced() && p[i].getIsOutput()) {
-                                    return true;
-                                }
-                            }
-                            return false;
-                        });
-                }
-
-                // Compile rules and rulesets
-                var nodeRules = rulesetNode.rules, nodeRuleCnt = nodeRules ? nodeRules.length : 0;
-                for (var i = 0; i < nodeRuleCnt; ) {
-                    rule = nodeRules[i];
-                    if (rule && rule.rules) {
-                        // visit because we are moving them out from being a child
-                        rulesets.push(this._visitor.visit(rule));
-                        nodeRules.splice(i, 1);
-                        nodeRuleCnt--;
-                        continue;
-                    }
-                    i++;
-                }
-                // accept the visitor to remove rules and refactor itself
-                // then we can decide now whether we want it or not
-                if (nodeRuleCnt > 0) {
-                    rulesetNode.accept(this._visitor);
-                } else {
-                    rulesetNode.rules = null;
-                }
-                visitArgs.visitDeeper = false;
-
-                nodeRules = rulesetNode.rules;
-                if (nodeRules) {
-                    this._mergeRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-                if (nodeRules) {
-                    this._removeDuplicateRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-
-                // now decide whether we keep the ruleset
-                if (nodeRules && nodeRules.length > 0 && rulesetNode.paths.length > 0) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            } else {
-                rulesetNode.accept(this._visitor);
-                visitArgs.visitDeeper = false;
-                if (rulesetNode.firstRoot || (rulesetNode.rules && rulesetNode.rules.length > 0)) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            }
-            if (rulesets.length === 1) {
-                return rulesets[0];
-            }
-            return rulesets;
-        },
-
-        _removeDuplicateRules: function(rules) {
-            if (!rules) { return; }
-
-            // remove duplicates
-            var ruleCache = {},
-                ruleList, rule, i;
-
-            for(i = rules.length - 1; i >= 0 ; i--) {
-                rule = rules[i];
-                if (rule instanceof tree.Rule) {
-                    if (!ruleCache[rule.name]) {
-                        ruleCache[rule.name] = rule;
-                    } else {
-                        ruleList = ruleCache[rule.name];
-                        if (ruleList instanceof tree.Rule) {
-                            ruleList = ruleCache[rule.name] = [ruleCache[rule.name].toCSS(this._env)];
-                        }
-                        var ruleCSS = rule.toCSS(this._env);
-                        if (ruleList.indexOf(ruleCSS) !== -1) {
-                            rules.splice(i, 1);
-                        } else {
-                            ruleList.push(ruleCSS);
-                        }
-                    }
-                }
-            }
-        },
-
-        _mergeRules: function (rules) {
-            if (!rules) { return; }
-
-            var groups = {},
-                parts,
-                rule,
-                key;
-
-            for (var i = 0; i < rules.length; i++) {
-                rule = rules[i];
-
-                if ((rule instanceof tree.Rule) && rule.merge) {
-                    key = [rule.name,
-                        rule.important ? "!" : ""].join(",");
-
-                    if (!groups[key]) {
-                        groups[key] = [];
-                    } else {
-                        rules.splice(i--, 1);
-                    }
-
-                    groups[key].push(rule);
-                }
-            }
-
-            Object.keys(groups).map(function (k) {
-
-                function toExpression(values) {
-                    return new (tree.Expression)(values.map(function (p) {
-                        return p.value;
-                    }));
-                }
-
-                function toValue(values) {
-                    return new (tree.Value)(values.map(function (p) {
-                        return p;
-                    }));
-                }
-
-                parts = groups[k];
-
-                if (parts.length > 1) {
-                    rule = parts[0];
-                    var spacedGroups = [];
-                    var lastSpacedGroup = [];
-                    parts.map(function (p) {
-                    if (p.merge==="+") {
-                        if (lastSpacedGroup.length > 0) {
-                                spacedGroups.push(toExpression(lastSpacedGroup));
-                            }
-                            lastSpacedGroup = [];
-                        }
-                        lastSpacedGroup.push(p);
-                    });
-                    spacedGroups.push(toExpression(lastSpacedGroup));
-                    rule.value = toValue(spacedGroups);
-                }
-            });
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    /*jshint loopfunc:true */
-
-    tree.extendFinderVisitor = function() {
-        this._visitor = new tree.visitor(this);
-        this.contexts = [];
-        this.allExtendsStack = [[]];
-    };
-
-    tree.extendFinderVisitor.prototype = {
-        run: function (root) {
-            root = this._visitor.visit(root);
-            root.allExtends = this.allExtendsStack[0];
-            return root;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-
-            var i, j, extend, allSelectorsExtendList = [], extendList;
-
-            // get &:extend(.a); rules which apply to all selectors in this ruleset
-            var rules = rulesetNode.rules, ruleCnt = rules ? rules.length : 0;
-            for(i = 0; i < ruleCnt; i++) {
-                if (rulesetNode.rules[i] instanceof tree.Extend) {
-                    allSelectorsExtendList.push(rules[i]);
-                    rulesetNode.extendOnEveryPath = true;
-                }
-            }
-
-            // now find every selector and apply the extends that apply to all extends
-            // and the ones which apply to an individual extend
-            var paths = rulesetNode.paths;
-            for(i = 0; i < paths.length; i++) {
-                var selectorPath = paths[i],
-                    selector = selectorPath[selectorPath.length - 1],
-                    selExtendList = selector.extendList;
-
-                extendList = selExtendList ? selExtendList.slice(0).concat(allSelectorsExtendList)
-                                           : allSelectorsExtendList;
-
-                if (extendList) {
-                    extendList = extendList.map(function(allSelectorsExtend) {
-                        return allSelectorsExtend.clone();
-                    });
-                }
-
-                for(j = 0; j < extendList.length; j++) {
-                    this.foundExtends = true;
-                    extend = extendList[j];
-                    extend.findSelfSelectors(selectorPath);
-                    extend.ruleset = rulesetNode;
-                    if (j === 0) { extend.firstExtendOnThisSelectorPath = true; }
-                    this.allExtendsStack[this.allExtendsStack.length-1].push(extend);
-                }
-            }
-
-            this.contexts.push(rulesetNode.selectors);
-        },
-        visitRulesetOut: function (rulesetNode) {
-            if (!rulesetNode.root) {
-                this.contexts.length = this.contexts.length - 1;
-            }
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            mediaNode.allExtends = [];
-            this.allExtendsStack.push(mediaNode.allExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            directiveNode.allExtends = [];
-            this.allExtendsStack.push(directiveNode.allExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-    tree.processExtendsVisitor = function() {
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.processExtendsVisitor.prototype = {
-        run: function(root) {
-            var extendFinder = new tree.extendFinderVisitor();
-            extendFinder.run(root);
-            if (!extendFinder.foundExtends) { return root; }
-            root.allExtends = root.allExtends.concat(this.doExtendChaining(root.allExtends, root.allExtends));
-            this.allExtendsStack = [root.allExtends];
-            return this._visitor.visit(root);
-        },
-        doExtendChaining: function (extendsList, extendsListTarget, iterationCount) {
-            //
-            // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering and pasting
-            // the selector we would do normally, but we are also adding an extend with the same target selector
-            // this means this new extend can then go and alter other extends
-            //
-            // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors
-            // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already processed if
-            // we look at each selector at a time, as is done in visitRuleset
-
-            var extendIndex, targetExtendIndex, matches, extendsToAdd = [], newSelector, extendVisitor = this, selectorPath, extend, targetExtend, newExtend;
-
-            iterationCount = iterationCount || 0;
-
-            //loop through comparing every extend with every target extend.
-            // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place
-            // e.g.  .a:extend(.b) {}  and .b:extend(.c) {} then the first extend extends the second one
-            // and the second is the target.
-            // the seperation into two lists allows us to process a subset of chains with a bigger set, as is the
-            // case when processing media queries
-            for(extendIndex = 0; extendIndex < extendsList.length; extendIndex++){
-                for(targetExtendIndex = 0; targetExtendIndex < extendsListTarget.length; targetExtendIndex++){
-
-                    extend = extendsList[extendIndex];
-                    targetExtend = extendsListTarget[targetExtendIndex];
-
-                    // look for circular references
-                    if( extend.parent_ids.indexOf( targetExtend.object_id ) >= 0 ){ continue; }
-
-                    // find a match in the target extends self selector (the bit before :extend)
-                    selectorPath = [targetExtend.selfSelectors[0]];
-                    matches = extendVisitor.findMatch(extend, selectorPath);
-
-                    if (matches.length) {
-
-                        // we found a match, so for each self selector..
-                        extend.selfSelectors.forEach(function(selfSelector) {
-
-                            // process the extend as usual
-                            newSelector = extendVisitor.extendSelector(matches, selectorPath, selfSelector);
-
-                            // but now we create a new extend from it
-                            newExtend = new(tree.Extend)(targetExtend.selector, targetExtend.option, 0);
-                            newExtend.selfSelectors = newSelector;
-
-                            // add the extend onto the list of extends for that selector
-                            newSelector[newSelector.length-1].extendList = [newExtend];
-
-                            // record that we need to add it.
-                            extendsToAdd.push(newExtend);
-                            newExtend.ruleset = targetExtend.ruleset;
-
-                            //remember its parents for circular references
-                            newExtend.parent_ids = newExtend.parent_ids.concat(targetExtend.parent_ids, extend.parent_ids);
-
-                            // only process the selector once.. if we have :extend(.a,.b) then multiple
-                            // extends will look at the same selector path, so when extending
-                            // we know that any others will be duplicates in terms of what is added to the css
-                            if (targetExtend.firstExtendOnThisSelectorPath) {
-                                newExtend.firstExtendOnThisSelectorPath = true;
-                                targetExtend.ruleset.paths.push(newSelector);
-                            }
-                        });
-                    }
-                }
-            }
-
-            if (extendsToAdd.length) {
-                // try to detect circular references to stop a stack overflow.
-                // may no longer be needed.
-                this.extendChainCount++;
-                if (iterationCount > 100) {
-                    var selectorOne = "{unable to calculate}";
-                    var selectorTwo = "{unable to calculate}";
-                    try
-                    {
-                        selectorOne = extendsToAdd[0].selfSelectors[0].toCSS();
-                        selectorTwo = extendsToAdd[0].selector.toCSS();
-                    }
-                    catch(e) {}
-                    throw {message: "extend circular reference detected. One of the circular extends is currently:"+selectorOne+":extend(" + selectorTwo+")"};
-                }
-
-                // now process the new extends on the existing rules so that we can handle a extending b extending c ectending d extending e...
-                return extendsToAdd.concat(extendVisitor.doExtendChaining(extendsToAdd, extendsListTarget, iterationCount+1));
-            } else {
-                return extendsToAdd;
-            }
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitSelector: function (selectorNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-            var matches, pathIndex, extendIndex, allExtends = this.allExtendsStack[this.allExtendsStack.length-1], selectorsToAdd = [], extendVisitor = this, selectorPath;
-
-            // look at each selector path in the ruleset, find any extend matches and then copy, find and replace
-
-            for(extendIndex = 0; extendIndex < allExtends.length; extendIndex++) {
-                for(pathIndex = 0; pathIndex < rulesetNode.paths.length; pathIndex++) {
-                    selectorPath = rulesetNode.paths[pathIndex];
-
-                    // extending extends happens initially, before the main pass
-                    if (rulesetNode.extendOnEveryPath) { continue; }
-                    var extendList = selectorPath[selectorPath.length-1].extendList;
-                    if (extendList && extendList.length) { continue; }
-
-                    matches = this.findMatch(allExtends[extendIndex], selectorPath);
-
-                    if (matches.length) {
-
-                        allExtends[extendIndex].selfSelectors.forEach(function(selfSelector) {
-                            selectorsToAdd.push(extendVisitor.extendSelector(matches, selectorPath, selfSelector));
-                        });
-                    }
-                }
-            }
-            rulesetNode.paths = rulesetNode.paths.concat(selectorsToAdd);
-        },
-        findMatch: function (extend, haystackSelectorPath) {
-            //
-            // look through the haystack selector path to try and find the needle - extend.selector
-            // returns an array of selector matches that can then be replaced
-            //
-            var haystackSelectorIndex, hackstackSelector, hackstackElementIndex, haystackElement,
-                targetCombinator, i,
-                extendVisitor = this,
-                needleElements = extend.selector.elements,
-                potentialMatches = [], potentialMatch, matches = [];
-
-            // loop through the haystack elements
-            for(haystackSelectorIndex = 0; haystackSelectorIndex < haystackSelectorPath.length; haystackSelectorIndex++) {
-                hackstackSelector = haystackSelectorPath[haystackSelectorIndex];
-
-                for(hackstackElementIndex = 0; hackstackElementIndex < hackstackSelector.elements.length; hackstackElementIndex++) {
-
-                    haystackElement = hackstackSelector.elements[hackstackElementIndex];
-
-                    // if we allow elements before our match we can add a potential match every time. otherwise only at the first element.
-                    if (extend.allowBefore || (haystackSelectorIndex === 0 && hackstackElementIndex === 0)) {
-                        potentialMatches.push({pathIndex: haystackSelectorIndex, index: hackstackElementIndex, matched: 0, initialCombinator: haystackElement.combinator});
-                    }
-
-                    for(i = 0; i < potentialMatches.length; i++) {
-                        potentialMatch = potentialMatches[i];
-
-                        // selectors add " " onto the first element. When we use & it joins the selectors together, but if we don't
-                        // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to work out
-                        // what the resulting combinator will be
-                        targetCombinator = haystackElement.combinator.value;
-                        if (targetCombinator === '' && hackstackElementIndex === 0) {
-                            targetCombinator = ' ';
-                        }
-
-                        // if we don't match, null our match to indicate failure
-                        if (!extendVisitor.isElementValuesEqual(needleElements[potentialMatch.matched].value, haystackElement.value) ||
-                            (potentialMatch.matched > 0 && needleElements[potentialMatch.matched].combinator.value !== targetCombinator)) {
-                            potentialMatch = null;
-                        } else {
-                            potentialMatch.matched++;
-                        }
-
-                        // if we are still valid and have finished, test whether we have elements after and whether these are allowed
-                        if (potentialMatch) {
-                            potentialMatch.finished = potentialMatch.matched === needleElements.length;
-                            if (potentialMatch.finished &&
-                                (!extend.allowAfter && (hackstackElementIndex+1 < hackstackSelector.elements.length || haystackSelectorIndex+1 < haystackSelectorPath.length))) {
-                                potentialMatch = null;
-                            }
-                        }
-                        // if null we remove, if not, we are still valid, so either push as a valid match or continue
-                        if (potentialMatch) {
-                            if (potentialMatch.finished) {
-                                potentialMatch.length = needleElements.length;
-                                potentialMatch.endPathIndex = haystackSelectorIndex;
-                                potentialMatch.endPathElementIndex = hackstackElementIndex + 1; // index after end of match
-                                potentialMatches.length = 0; // we don't allow matches to overlap, so start matching again
-                                matches.push(potentialMatch);
-                            }
-                        } else {
-                            potentialMatches.splice(i, 1);
-                            i--;
-                        }
-                    }
-                }
-            }
-            return matches;
-        },
-        isElementValuesEqual: function(elementValue1, elementValue2) {
-            if (typeof elementValue1 === "string" || typeof elementValue2 === "string") {
-                return elementValue1 === elementValue2;
-            }
-            if (elementValue1 instanceof tree.Attribute) {
-                if (elementValue1.op !== elementValue2.op || elementValue1.key !== elementValue2.key) {
-                    return false;
-                }
-                if (!elementValue1.value || !elementValue2.value) {
-                    if (elementValue1.value || elementValue2.value) {
-                        return false;
-                    }
-                    return true;
-                }
-                elementValue1 = elementValue1.value.value || elementValue1.value;
-                elementValue2 = elementValue2.value.value || elementValue2.value;
-                return elementValue1 === elementValue2;
-            }
-            elementValue1 = elementValue1.value;
-            elementValue2 = elementValue2.value;
-            if (elementValue1 instanceof tree.Selector) {
-                if (!(elementValue2 instanceof tree.Selector) || elementValue1.elements.length !== elementValue2.elements.length) {
-                    return false;
-                }
-                for(var i = 0; i <elementValue1.elements.length; i++) {
-                    if (elementValue1.elements[i].combinator.value !== elementValue2.elements[i].combinator.value) {
-                        if (i !== 0 || (elementValue1.elements[i].combinator.value || ' ') !== (elementValue2.elements[i].combinator.value || ' ')) {
-                            return false;
-                        }
-                    }
-                    if (!this.isElementValuesEqual(elementValue1.elements[i].value, elementValue2.elements[i].value)) {
-                        return false;
-                    }
-                }
-                return true;
-            }
-            return false;
-        },
-        extendSelector:function (matches, selectorPath, replacementSelector) {
-
-            //for a set of matches, replace each match with the replacement selector
-
-            var currentSelectorPathIndex = 0,
-                currentSelectorPathElementIndex = 0,
-                path = [],
-                matchIndex,
-                selector,
-                firstElement,
-                match,
-                newElements;
-
-            for (matchIndex = 0; matchIndex < matches.length; matchIndex++) {
-                match = matches[matchIndex];
-                selector = selectorPath[match.pathIndex];
-                firstElement = new tree.Element(
-                    match.initialCombinator,
-                    replacementSelector.elements[0].value,
-                    replacementSelector.elements[0].index,
-                    replacementSelector.elements[0].currentFileInfo
-                );
-
-                if (match.pathIndex > currentSelectorPathIndex && currentSelectorPathElementIndex > 0) {
-                    path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-
-                newElements = selector.elements
-                    .slice(currentSelectorPathElementIndex, match.index)
-                    .concat([firstElement])
-                    .concat(replacementSelector.elements.slice(1));
-
-                if (currentSelectorPathIndex === match.pathIndex && matchIndex > 0) {
-                    path[path.length - 1].elements =
-                        path[path.length - 1].elements.concat(newElements);
-                } else {
-                    path = path.concat(selectorPath.slice(currentSelectorPathIndex, match.pathIndex));
-
-                    path.push(new tree.Selector(
-                        newElements
-                    ));
-                }
-                currentSelectorPathIndex = match.endPathIndex;
-                currentSelectorPathElementIndex = match.endPathElementIndex;
-                if (currentSelectorPathElementIndex >= selectorPath[currentSelectorPathIndex].elements.length) {
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-            }
-
-            if (currentSelectorPathIndex < selectorPath.length && currentSelectorPathElementIndex > 0) {
-                path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                currentSelectorPathIndex++;
-            }
-
-            path = path.concat(selectorPath.slice(currentSelectorPathIndex, selectorPath.length));
-
-            return path;
-        },
-        visitRulesetOut: function (rulesetNode) {
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var newAllExtends = mediaNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, mediaNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            var newAllExtends = directiveNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, directiveNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    tree.sourceMapOutput = function (options) {
-        this._css = [];
-        this._rootNode = options.rootNode;
-        this._writeSourceMap = options.writeSourceMap;
-        this._contentsMap = options.contentsMap;
-        this._contentsIgnoredCharsMap = options.contentsIgnoredCharsMap;
-        this._sourceMapFilename = options.sourceMapFilename;
-        this._outputFilename = options.outputFilename;
-        this._sourceMapURL = options.sourceMapURL;
-        if (options.sourceMapBasepath) {
-            this._sourceMapBasepath = options.sourceMapBasepath.replace(/\\/g, '/');
-        }
-        this._sourceMapRootpath = options.sourceMapRootpath;
-        this._outputSourceFiles = options.outputSourceFiles;
-        this._sourceMapGeneratorConstructor = options.sourceMapGenerator || require("source-map").SourceMapGenerator;
-
-        if (this._sourceMapRootpath && this._sourceMapRootpath.charAt(this._sourceMapRootpath.length-1) !== '/') {
-            this._sourceMapRootpath += '/';
-        }
-
-        this._lineNumber = 0;
-        this._column = 0;
-    };
-
-    tree.sourceMapOutput.prototype.normalizeFilename = function(filename) {
-        filename = filename.replace(/\\/g, '/');
-
-        if (this._sourceMapBasepath && filename.indexOf(this._sourceMapBasepath) === 0) {
-            filename = filename.substring(this._sourceMapBasepath.length);
-            if (filename.charAt(0) === '\\' || filename.charAt(0) === '/') {
-               filename = filename.substring(1);
-            }
-        }
-        return (this._sourceMapRootpath || "") + filename;
-    };
-
-    tree.sourceMapOutput.prototype.add = function(chunk, fileInfo, index, mapLines) {
-
-        //ignore adding empty strings
-        if (!chunk) {
-            return;
-        }
-
-        var lines,
-            sourceLines,
-            columns,
-            sourceColumns,
-            i;
-
-        if (fileInfo) {
-            var inputSource = this._contentsMap[fileInfo.filename];
-
-            // remove vars/banner added to the top of the file
-            if (this._contentsIgnoredCharsMap[fileInfo.filename]) {
-                // adjust the index
-                index -= this._contentsIgnoredCharsMap[fileInfo.filename];
-                if (index < 0) { index = 0; }
-                // adjust the source
-                inputSource = inputSource.slice(this._contentsIgnoredCharsMap[fileInfo.filename]);
-            }
-            inputSource = inputSource.substring(0, index);
-            sourceLines = inputSource.split("\n");
-            sourceColumns = sourceLines[sourceLines.length-1];
-        }
-
-        lines = chunk.split("\n");
-        columns = lines[lines.length-1];
-
-        if (fileInfo) {
-            if (!mapLines) {
-                this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + 1, column: this._column},
-                    original: { line: sourceLines.length, column: sourceColumns.length},
-                    source: this.normalizeFilename(fileInfo.filename)});
-            } else {
-                for(i = 0; i < lines.length; i++) {
-                    this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + i + 1, column: i === 0 ? this._column : 0},
-                        original: { line: sourceLines.length + i, column: i === 0 ? sourceColumns.length : 0},
-                        source: this.normalizeFilename(fileInfo.filename)});
-                }
-            }
-        }
-
-        if (lines.length === 1) {
-            this._column += columns.length;
-        } else {
-            this._lineNumber += lines.length - 1;
-            this._column = columns.length;
-        }
-
-        this._css.push(chunk);
-    };
-
-    tree.sourceMapOutput.prototype.isEmpty = function() {
-        return this._css.length === 0;
-    };
-
-    tree.sourceMapOutput.prototype.toCSS = function(env) {
-        this._sourceMapGenerator = new this._sourceMapGeneratorConstructor({ file: this._outputFilename, sourceRoot: null });
-
-        if (this._outputSourceFiles) {
-            for(var filename in this._contentsMap) {
-                if (this._contentsMap.hasOwnProperty(filename))
-                {
-                    var source = this._contentsMap[filename];
-                    if (this._contentsIgnoredCharsMap[filename]) {
-                        source = source.slice(this._contentsIgnoredCharsMap[filename]);
-                    }
-                    this._sourceMapGenerator.setSourceContent(this.normalizeFilename(filename), source);
-                }
-            }
-        }
-
-        this._rootNode.genCSS(env, this);
-
-        if (this._css.length > 0) {
-            var sourceMapURL,
-                sourceMapContent = JSON.stringify(this._sourceMapGenerator.toJSON());
-
-            if (this._sourceMapURL) {
-                sourceMapURL = this._sourceMapURL;
-            } else if (this._sourceMapFilename) {
-                sourceMapURL = this.normalizeFilename(this._sourceMapFilename);
-            }
-
-            if (this._writeSourceMap) {
-                this._writeSourceMap(sourceMapContent);
-            } else {
-                sourceMapURL = "data:application/json," + encodeURIComponent(sourceMapContent);
-            }
-
-            if (sourceMapURL) {
-                this._css.push("/*# sourceMappingURL=" + sourceMapURL + " */");
-            }
-        }
-
-        return this._css.join('');
-    };
-
-})(require('./tree'));
-
-//
-// browser.js - client-side engine
-//
-/*global less, window, document, XMLHttpRequest, location */
-
-var isFileProtocol = /^(file|chrome(-extension)?|resource|qrc|app):/.test(location.protocol);
-
-less.env = less.env || (location.hostname == '127.0.0.1' ||
-                        location.hostname == '0.0.0.0'   ||
-                        location.hostname == 'localhost' ||
-                        (location.port &&
-                          location.port.length > 0)      ||
-                        isFileProtocol                   ? 'development'
-                                                         : 'production');
-
-var logLevel = {
-    debug: 3,
-    info: 2,
-    errors: 1,
-    none: 0
-};
-
-// The amount of logging in the javascript console.
-// 3 - Debug, information and errors
-// 2 - Information and errors
-// 1 - Errors
-// 0 - None
-// Defaults to 2
-less.logLevel = typeof(less.logLevel) != 'undefined' ? less.logLevel : (less.env === 'development' ?  logLevel.debug : logLevel.errors);
-
-// Load styles asynchronously (default: false)
-//
-// This is set to `false` by default, so that the body
-// doesn't start loading before the stylesheets are parsed.
-// Setting this to `true` can result in flickering.
-//
-less.async = less.async || false;
-less.fileAsync = less.fileAsync || false;
-
-// Interval between watch polls
-less.poll = less.poll || (isFileProtocol ? 1000 : 1500);
-
-//Setup user functions
-if (less.functions) {
-    for(var func in less.functions) {
-        if (less.functions.hasOwnProperty(func)) {
-            less.tree.functions[func] = less.functions[func];
-        }
-   }
-}
-
-var dumpLineNumbers = /!dumpLineNumbers:(comments|mediaquery|all)/.exec(location.hash);
-if (dumpLineNumbers) {
-    less.dumpLineNumbers = dumpLineNumbers[1];
-}
-
-var typePattern = /^text\/(x-)?less$/;
-var cache = null;
-var fileCache = {};
-
-function log(str, level) {
-    if (typeof(console) !== 'undefined' && less.logLevel >= level) {
-        console.log('less: ' + str);
-    }
-}
-
-function extractId(href) {
-    return href.replace(/^[a-z-]+:\/+?[^\/]+/, '' )  // Remove protocol & domain
-        .replace(/^\//,                 '' )  // Remove root /
-        .replace(/\.[a-zA-Z]+$/,        '' )  // Remove simple extension
-        .replace(/[^\.\w-]+/g,          '-')  // Replace illegal characters
-        .replace(/\./g,                 ':'); // Replace dots with colons(for valid id)
-}
-
-function errorConsole(e, rootHref) {
-    var template = '{line} {content}';
-    var filename = e.filename || rootHref;
-    var errors = [];
-    var content = (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        " in " + filename + " ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':\n' +
-            errors.join('\n');
-    } else if (e.stack) {
-        content += e.stack;
-    }
-    log(content, logLevel.errors);
-}
-
-function createCSS(styles, sheet, lastModified) {
-    // Strip the query-string
-    var href = sheet.href || '';
-
-    // If there is no title set, use the filename, minus the extension
-    var id = 'less:' + (sheet.title || extractId(href));
-
-    // If this has already been inserted into the DOM, we may need to replace it
-    var oldCss = document.getElementById(id);
-    var keepOldCss = false;
-
-    // Create a new stylesheet node for insertion or (if necessary) replacement
-    var css = document.createElement('style');
-    css.setAttribute('type', 'text/css');
-    if (sheet.media) {
-        css.setAttribute('media', sheet.media);
-    }
-    css.id = id;
-
-    if (!css.styleSheet) {
-        css.appendChild(document.createTextNode(styles));
-
-        // If new contents match contents of oldCss, don't replace oldCss
-        keepOldCss = (oldCss !== null && oldCss.childNodes.length > 0 && css.childNodes.length > 0 &&
-            oldCss.firstChild.nodeValue === css.firstChild.nodeValue);
-    }
-
-    var head = document.getElementsByTagName('head')[0];
-
-    // If there is no oldCss, just append; otherwise, only append if we need
-    // to replace oldCss with an updated stylesheet
-    if (oldCss === null || keepOldCss === false) {
-        var nextEl = sheet && sheet.nextSibling || null;
-        if (nextEl) {
-            nextEl.parentNode.insertBefore(css, nextEl);
-        } else {
-            head.appendChild(css);
-        }
-    }
-    if (oldCss && keepOldCss === false) {
-        oldCss.parentNode.removeChild(oldCss);
-    }
-
-    // For IE.
-    // This needs to happen *after* the style element is added to the DOM, otherwise IE 7 and 8 may crash.
-    // See http://social.msdn.microsoft.com/Forums/en-US/7e081b65-878a-4c22-8e68-c10d39c2ed32/internet-explorer-crashes-appending-style-element-to-head
-    if (css.styleSheet) {
-        try {
-            css.styleSheet.cssText = styles;
-        } catch (e) {
-            throw new(Error)("Couldn't reassign styleSheet.cssText.");
-        }
-    }
-
-    // Don't update the local store if the file wasn't modified
-    if (lastModified && cache) {
-        log('saving ' + href + ' to cache.', logLevel.info);
-        try {
-            cache.setItem(href, styles);
-            cache.setItem(href + ':timestamp', lastModified);
-        } catch(e) {
-            //TODO - could do with adding more robust error handling
-            log('failed to save', logLevel.errors);
-        }
-    }
-}
-
-function postProcessCSS(styles) {
-    if (less.postProcessor && typeof less.postProcessor === 'function') {
-        styles = less.postProcessor.call(styles, styles) || styles;
-    }
-    return styles;
-}
-
-function errorHTML(e, rootHref) {
-    var id = 'less-error-message:' + extractId(rootHref || "");
-    var template = '<li><label>{line}</label><pre class="{class}">{content}</pre></li>';
-    var elem = document.createElement('div'), timer, content, errors = [];
-    var filename = e.filename || rootHref;
-    var filenameNoPath = filename.match(/([^\/]+(\?.*)?)$/)[1];
-
-    elem.id        = id;
-    elem.className = "less-error-message";
-
-    content = '<h3>'  + (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        '</h3>' + '<p>in <a href="' + filename   + '">' + filenameNoPath + "</a> ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':</p>' +
-            '<ul>' + errors.join('') + '</ul>';
-    } else if (e.stack) {
-        content += '<br/>' + e.stack.split('\n').slice(1).join('<br/>');
-    }
-    elem.innerHTML = content;
-
-    // CSS for error messages
-    createCSS([
-        '.less-error-message ul, .less-error-message li {',
-        'list-style-type: none;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message label {',
-        'font-size: 12px;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'color: #cc7777;',
-        '}',
-        '.less-error-message pre {',
-        'color: #dd6666;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        'display: inline-block;',
-        '}',
-        '.less-error-message pre.line {',
-        'color: #ff0000;',
-        '}',
-        '.less-error-message h3 {',
-        'font-size: 20px;',
-        'font-weight: bold;',
-        'padding: 15px 0 5px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message a {',
-        'color: #10a',
-        '}',
-        '.less-error-message .error {',
-        'color: red;',
-        'font-weight: bold;',
-        'padding-bottom: 2px;',
-        'border-bottom: 1px dashed red;',
-        '}'
-    ].join('\n'), { title: 'error-message' });
-
-    elem.style.cssText = [
-        "font-family: Arial, sans-serif",
-        "border: 1px solid #e00",
-        "background-color: #eee",
-        "border-radius: 5px",
-        "-webkit-border-radius: 5px",
-        "-moz-border-radius: 5px",
-        "color: #e00",
-        "padding: 15px",
-        "margin-bottom: 15px"
-    ].join(';');
-
-    if (less.env == 'development') {
-        timer = setInterval(function () {
-            if (document.body) {
-                if (document.getElementById(id)) {
-                    document.body.replaceChild(elem, document.getElementById(id));
-                } else {
-                    document.body.insertBefore(elem, document.body.firstChild);
-                }
-                clearInterval(timer);
-            }
-        }, 10);
-    }
-}
-
-function error(e, rootHref) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        errorHTML(e, rootHref);
-    } else if (less.errorReporting === "console") {
-        errorConsole(e, rootHref);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("add", e, rootHref);
-    }
-}
-
-function removeErrorHTML(path) {
-    var node = document.getElementById('less-error-message:' + extractId(path));
-    if (node) {
-        node.parentNode.removeChild(node);
-    }
-}
-
-function removeErrorConsole(path) {
-    //no action
-}
-
-function removeError(path) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        removeErrorHTML(path);
-    } else if (less.errorReporting === "console") {
-        removeErrorConsole(path);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("remove", path);
-    }
-}
-
-function loadStyles(modifyVars) {
-    var styles = document.getElementsByTagName('style'),
-        style;
-    for (var i = 0; i < styles.length; i++) {
-        style = styles[i];
-        if (style.type.match(typePattern)) {
-            var env = new less.tree.parseEnv(less),
-                lessText = style.innerHTML || '';
-            env.filename = document.location.href.replace(/#.*$/, '');
-
-            if (modifyVars || less.globalVars) {
-                env.useFileCache = true;
-            }
-
-            /*jshint loopfunc:true */
-            // use closure to store current value of i
-            var callback = (function(style) {
-                return function (e, cssAST) {
-                    if (e) {
-                        return error(e, "inline");
-                    }
-                    var css = cssAST.toCSS(less);
-                    style.type = 'text/css';
-                    if (style.styleSheet) {
-                        style.styleSheet.cssText = css;
-                    } else {
-                        style.innerHTML = css;
-                    }
-                };
-            })(style);
-            new(less.Parser)(env).parse(lessText, callback, {globalVars: less.globalVars, modifyVars: modifyVars});
-        }
-    }
-}
-
-function extractUrlParts(url, baseUrl) {
-    // urlParts[1] = protocol&hostname || /
-    // urlParts[2] = / if path relative to host base
-    // urlParts[3] = directories
-    // urlParts[4] = filename
-    // urlParts[5] = parameters
-
-    var urlPartsRegex = /^((?:[a-z-]+:)?\/+?(?:[^\/\?#]*\/)|([\/\\]))?((?:[^\/\\\?#]*[\/\\])*)([^\/\\\?#]*)([#\?].*)?$/i,
-        urlParts = url.match(urlPartsRegex),
-        returner = {}, directories = [], i, baseUrlParts;
-
-    if (!urlParts) {
-        throw new Error("Could not parse sheet href - '"+url+"'");
-    }
-
-    // Stylesheets in IE don't always return the full path
-    if (!urlParts[1] || urlParts[2]) {
-        baseUrlParts = baseUrl.match(urlPartsRegex);
-        if (!baseUrlParts) {
-            throw new Error("Could not parse page url - '"+baseUrl+"'");
-        }
-        urlParts[1] = urlParts[1] || baseUrlParts[1] || "";
-        if (!urlParts[2]) {
-            urlParts[3] = baseUrlParts[3] + urlParts[3];
-        }
-    }
-
-    if (urlParts[3]) {
-        directories = urlParts[3].replace(/\\/g, "/").split("/");
-
-        // extract out . before .. so .. doesn't absorb a non-directory
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".") {
-                directories.splice(i, 1);
-                i -= 1;
-            }
-        }
-
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".." && i > 0) {
-                directories.splice(i-1, 2);
-                i -= 2;
-            }
-        }
-    }
-
-    returner.hostPart = urlParts[1];
-    returner.directories = directories;
-    returner.path = urlParts[1] + directories.join("/");
-    returner.fileUrl = returner.path + (urlParts[4] || "");
-    returner.url = returner.fileUrl + (urlParts[5] || "");
-    return returner;
-}
-
-function pathDiff(url, baseUrl) {
-    // diff between two paths to create a relative path
-
-    var urlParts = extractUrlParts(url),
-        baseUrlParts = extractUrlParts(baseUrl),
-        i, max, urlDirectories, baseUrlDirectories, diff = "";
-    if (urlParts.hostPart !== baseUrlParts.hostPart) {
-        return "";
-    }
-    max = Math.max(baseUrlParts.directories.length, urlParts.directories.length);
-    for(i = 0; i < max; i++) {
-        if (baseUrlParts.directories[i] !== urlParts.directories[i]) { break; }
-    }
-    baseUrlDirectories = baseUrlParts.directories.slice(i);
-    urlDirectories = urlParts.directories.slice(i);
-    for(i = 0; i < baseUrlDirectories.length-1; i++) {
-        diff += "../";
-    }
-    for(i = 0; i < urlDirectories.length-1; i++) {
-        diff += urlDirectories[i] + "/";
-    }
-    return diff;
-}
-
-function getXMLHttpRequest() {
-    if (window.XMLHttpRequest && (window.location.protocol !== "file:" || !("ActiveXObject" in window))) {
-        return new XMLHttpRequest();
-    } else {
-        try {
-            /*global ActiveXObject */
-            return new ActiveXObject("Microsoft.XMLHTTP");
-        } catch (e) {
-            log("browser doesn't support AJAX.", logLevel.errors);
-            return null;
-        }
-    }
-}
-
-function doXHR(url, type, callback, errback) {
-    var xhr = getXMLHttpRequest();
-    var async = isFileProtocol ? less.fileAsync : less.async;
-
-    if (typeof(xhr.overrideMimeType) === 'function') {
-        xhr.overrideMimeType('text/css');
-    }
-    log("XHR: Getting '" + url + "'", logLevel.debug);
-    xhr.open('GET', url, async);
-    xhr.setRequestHeader('Accept', type || 'text/x-less, text/css; q=0.9, */*; q=0.5');
-    xhr.send(null);
-
-    function handleResponse(xhr, callback, errback) {
-        if (xhr.status >= 200 && xhr.status < 300) {
-            callback(xhr.responseText,
-                xhr.getResponseHeader("Last-Modified"));
-        } else if (typeof(errback) === 'function') {
-            errback(xhr.status, url);
-        }
-    }
-
-    if (isFileProtocol && !less.fileAsync) {
-        if (xhr.status === 0 || (xhr.status >= 200 && xhr.status < 300)) {
-            callback(xhr.responseText);
-        } else {
-            errback(xhr.status, url);
-        }
-    } else if (async) {
-        xhr.onreadystatechange = function () {
-            if (xhr.readyState == 4) {
-                handleResponse(xhr, callback, errback);
-            }
-        };
-    } else {
-        handleResponse(xhr, callback, errback);
-    }
-}
-
-function loadFile(originalHref, currentFileInfo, callback, env, modifyVars) {
-
-    if (currentFileInfo && currentFileInfo.currentDirectory && !/^([a-z-]+:)?\//.test(originalHref)) {
-        originalHref = currentFileInfo.currentDirectory + originalHref;
-    }
-
-    // sheet may be set to the stylesheet for the initial load or a collection of properties including
-    // some env variables for imports
-    var hrefParts = extractUrlParts(originalHref, window.location.href);
-    var href      = hrefParts.url;
-    var newFileInfo = {
-        currentDirectory: hrefParts.path,
-        filename: href
-    };
-
-    if (currentFileInfo) {
-        newFileInfo.entryPath = currentFileInfo.entryPath;
-        newFileInfo.rootpath = currentFileInfo.rootpath;
-        newFileInfo.rootFilename = currentFileInfo.rootFilename;
-        newFileInfo.relativeUrls = currentFileInfo.relativeUrls;
-    } else {
-        newFileInfo.entryPath = hrefParts.path;
-        newFileInfo.rootpath = less.rootpath || hrefParts.path;
-        newFileInfo.rootFilename = href;
-        newFileInfo.relativeUrls = env.relativeUrls;
-    }
-
-    if (newFileInfo.relativeUrls) {
-        if (env.rootpath) {
-            newFileInfo.rootpath = extractUrlParts(env.rootpath + pathDiff(hrefParts.path, newFileInfo.entryPath)).path;
-        } else {
-            newFileInfo.rootpath = hrefParts.path;
-        }
-    }
-
-    if (env.useFileCache && fileCache[href]) {
-        try {
-            var lessText = fileCache[href];
-            callback(null, lessText, href, newFileInfo, { lastModified: new Date() });
-        } catch (e) {
-            callback(e, null, href);
-        }
-        return;
-    }
-
-    doXHR(href, env.mime, function (data, lastModified) {
-        // per file cache
-        fileCache[href] = data;
-
-        // Use remote copy (re-parse)
-        try {
-            callback(null, data, href, newFileInfo, { lastModified: lastModified });
-        } catch (e) {
-            callback(e, null, href);
-        }
-    }, function (status, url) {
-        callback({ type: 'File', message: "'" + url + "' wasn't found (" + status + ")" }, null, href);
-    });
-}
-
-function loadStyleSheet(sheet, callback, reload, remaining, modifyVars) {
-
-    var env = new less.tree.parseEnv(less);
-    env.mime = sheet.type;
-
-    if (modifyVars || less.globalVars) {
-        env.useFileCache = true;
-    }
-
-    loadFile(sheet.href, null, function(e, data, path, newFileInfo, webInfo) {
-
-        if (webInfo) {
-            webInfo.remaining = remaining;
-
-            var css       = cache && cache.getItem(path),
-                timestamp = cache && cache.getItem(path + ':timestamp');
-
-            if (!reload && timestamp && webInfo.lastModified &&
-                (new(Date)(webInfo.lastModified).valueOf() ===
-                    new(Date)(timestamp).valueOf())) {
-                // Use local copy
-                createCSS(css, sheet);
-                webInfo.local = true;
-                callback(null, null, data, sheet, webInfo, path);
-                return;
-            }
-        }
-
-        //TODO add tests around how this behaves when reloading
-        removeError(path);
-
-        if (data) {
-            env.currentFileInfo = newFileInfo;
-            new(less.Parser)(env).parse(data, function (e, root) {
-                if (e) { return callback(e, null, null, sheet); }
-                try {
-                    callback(e, root, data, sheet, webInfo, path);
-                } catch (e) {
-                    callback(e, null, null, sheet);
-                }
-            }, {modifyVars: modifyVars, globalVars: less.globalVars});
-        } else {
-            callback(e, null, null, sheet, webInfo, path);
-        }
-    }, env, modifyVars);
-}
-
-function loadStyleSheets(callback, reload, modifyVars) {
-    for (var i = 0; i < less.sheets.length; i++) {
-        loadStyleSheet(less.sheets[i], callback, reload, less.sheets.length - (i + 1), modifyVars);
-    }
-}
-
-function initRunningMode(){
-    if (less.env === 'development') {
-        less.optimization = 0;
-        less.watchTimer = setInterval(function () {
-            if (less.watchMode) {
-                loadStyleSheets(function (e, root, _, sheet, env) {
-                    if (e) {
-                        error(e, sheet.href);
-                    } else if (root) {
-                        var styles = root.toCSS(less);
-                        styles = postProcessCSS(styles);
-                        createCSS(styles, sheet, env.lastModified);
-                    }
-                });
-            }
-        }, less.poll);
-    } else {
-        less.optimization = 3;
-    }
-}
-
-
-
-//
-// Watch mode
-//
-less.watch   = function () {
-    if (!less.watchMode ){
-        less.env = 'development';
-         initRunningMode();
-    }
-    this.watchMode = true;
-    return true;
-};
-
-less.unwatch = function () {clearInterval(less.watchTimer); this.watchMode = false; return false; };
-
-if (/!watch/.test(location.hash)) {
-    less.watch();
-}
-
-if (less.env != 'development') {
-    try {
-        cache = (typeof(window.localStorage) === 'undefined') ? null : window.localStorage;
-    } catch (_) {}
-}
-
-//
-// Get all <link> tags with the 'rel' attribute set to "stylesheet/less"
-//
-var links = document.getElementsByTagName('link');
-
-less.sheets = [];
-
-for (var i = 0; i < links.length; i++) {
-    if (links[i].rel === 'stylesheet/less' || (links[i].rel.match(/stylesheet/) &&
-       (links[i].type.match(typePattern)))) {
-        less.sheets.push(links[i]);
-    }
-}
-
-//
-// With this function, it's possible to alter variables and re-render
-// CSS without reloading less-files
-//
-less.modifyVars = function(record) {
-    less.refresh(false, record);
-};
-
-less.refresh = function (reload, modifyVars) {
-    var startTime, endTime;
-    startTime = endTime = new Date();
-
-    loadStyleSheets(function (e, root, _, sheet, env) {
-        if (e) {
-            return error(e, sheet.href);
-        }
-        if (env.local) {
-            log("loading " + sheet.href + " from cache.", logLevel.info);
-        } else {
-            log("parsed " + sheet.href + " successfully.", logLevel.debug);
-            var styles = root.toCSS(less);
-            styles = postProcessCSS(styles);
-            createCSS(styles, sheet, env.lastModified);
-        }
-        log("css for " + sheet.href + " generated in " + (new Date() - endTime) + 'ms', logLevel.info);
-        if (env.remaining === 0) {
-            log("less has finished. css generated in " + (new Date() - startTime) + 'ms', logLevel.info);
-        }
-        endTime = new Date();
-    }, reload, modifyVars);
-
-    loadStyles(modifyVars);
-};
-
-less.refreshStyles = loadStyles;
-
-less.Parser.fileLoader = loadFile;
-
-less.refresh(less.env === 'development');
-
-// amd.js
-//
-// Define Less as an AMD module.
-if (typeof define === "function" && define.amd) {
-    define(function () { return less; } );
-}
-
-})(window);
\ No newline at end of file
diff --git a/test/assets/less-1.7.5.js b/test/assets/less-1.7.5.js
deleted file mode 100644
index 9530af82..00000000
--- a/test/assets/less-1.7.5.js
+++ /dev/null
@@ -1,8023 +0,0 @@
-/*!
- * Less - Leaner CSS v1.7.5
- * http://lesscss.org
- *
- * Copyright (c) 2009-2014, Alexis Sellier <self@cloudhead.net>
- * Licensed under the Apache v2 License.
- *
- */
-
- /** * @license Apache v2
- */
-
-
-
-(function (window, undefined) {//
-// Stub out `require` in the browser
-//
-function require(arg) {
-    return window.less[arg.split('/')[1]];
-};
-
-
-if (typeof(window.less) === 'undefined' || typeof(window.less.nodeType) !== 'undefined') { window.less = {}; }
-less = window.less;
-tree = window.less.tree = {};
-less.mode = 'browser';
-
-var less, tree;
-
-// Node.js does not have a header file added which defines less
-if (less === undefined) {
-    less = exports;
-    tree = require('./tree');
-    less.mode = 'node';
-}
-//
-// less.js - parser
-//
-//    A relatively straight-forward predictive parser.
-//    There is no tokenization/lexing stage, the input is parsed
-//    in one sweep.
-//
-//    To make the parser fast enough to run in the browser, several
-//    optimization had to be made:
-//
-//    - Matching and slicing on a huge input is often cause of slowdowns.
-//      The solution is to chunkify the input into smaller strings.
-//      The chunks are stored in the `chunks` var,
-//      `j` holds the current chunk index, and `currentPos` holds
-//      the index of the current chunk in relation to `input`.
-//      This gives us an almost 4x speed-up.
-//
-//    - In many cases, we don't need to match individual tokens;
-//      for example, if a value doesn't hold any variables, operations
-//      or dynamic references, the parser can effectively 'skip' it,
-//      treating it as a literal.
-//      An example would be '1px solid #000' - which evaluates to itself,
-//      we don't need to know what the individual components are.
-//      The drawback, of course is that you don't get the benefits of
-//      syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
-//      and a smaller speed-up in the code-gen.
-//
-//
-//    Token matching is done with the `$` function, which either takes
-//    a terminal string or regexp, or a non-terminal function to call.
-//    It also takes care of moving all the indices forwards.
-//
-//
-less.Parser = function Parser(env) {
-    var input,       // LeSS input string
-        i,           // current index in `input`
-        j,           // current chunk
-        saveStack = [],   // holds state for backtracking
-        furthest,    // furthest index the parser has gone to
-        chunks,      // chunkified input
-        current,     // current chunk
-        currentPos,  // index of current chunk, in `input`
-        parser,
-        parsers,
-        rootFilename = env && env.filename;
-
-    // Top parser on an import tree must be sure there is one "env"
-    // which will then be passed around by reference.
-    if (!(env instanceof tree.parseEnv)) {
-        env = new tree.parseEnv(env);
-    }
-
-    var imports = this.imports = {
-        paths: env.paths || [],  // Search paths, when importing
-        queue: [],               // Files which haven't been imported yet
-        files: env.files,        // Holds the imported parse trees
-        contents: env.contents,  // Holds the imported file contents
-        contentsIgnoredChars: env.contentsIgnoredChars, // lines inserted, not in the original less
-        mime:  env.mime,         // MIME type of .less files
-        error: null,             // Error in parsing/evaluating an import
-        push: function (path, currentFileInfo, importOptions, callback) {
-            var parserImports = this;
-            this.queue.push(path);
-
-            var fileParsedFunc = function (e, root, fullPath) {
-                parserImports.queue.splice(parserImports.queue.indexOf(path), 1); // Remove the path from the queue
-
-                var importedPreviously = fullPath === rootFilename;
-
-                parserImports.files[fullPath] = root;                        // Store the root
-
-                if (e && !parserImports.error) { parserImports.error = e; }
-
-                callback(e, root, importedPreviously, fullPath);
-            };
-
-            if (less.Parser.importer) {
-                less.Parser.importer(path, currentFileInfo, fileParsedFunc, env);
-            } else {
-                less.Parser.fileLoader(path, currentFileInfo, function(e, contents, fullPath, newFileInfo) {
-                    if (e) {fileParsedFunc(e); return;}
-
-                    var newEnv = new tree.parseEnv(env);
-
-                    newEnv.currentFileInfo = newFileInfo;
-                    newEnv.processImports = false;
-                    newEnv.contents[fullPath] = contents;
-
-                    if (currentFileInfo.reference || importOptions.reference) {
-                        newFileInfo.reference = true;
-                    }
-
-                    if (importOptions.inline) {
-                        fileParsedFunc(null, contents, fullPath);
-                    } else {
-                        new(less.Parser)(newEnv).parse(contents, function (e, root) {
-                            fileParsedFunc(e, root, fullPath);
-                        });
-                    }
-                }, env);
-            }
-        }
-    };
-
-    function save()    { currentPos = i; saveStack.push( { current: current, i: i, j: j }); }
-    function restore() { var state = saveStack.pop(); current = state.current; currentPos = i = state.i; j = state.j; }
-    function forget() { saveStack.pop(); }
-
-    function sync() {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-    }
-    function isWhitespace(str, pos) {
-        var code = str.charCodeAt(pos | 0);
-        return (code <= 32) && (code === 32 || code === 10 || code === 9);
-    }
-    //
-    // Parse from a token, regexp or string, and move forward if match
-    //
-    function $(tok) {
-        var tokType = typeof tok,
-            match, length;
-
-        // Either match a single character in the input,
-        // or match a regexp in the current chunk (`current`).
-        //
-        if (tokType === "string") {
-            if (input.charAt(i) !== tok) {
-                return null;
-            }
-            skipWhitespace(1);
-            return tok;
-        }
-
-        // regexp
-        sync ();
-        if (! (match = tok.exec(current))) {
-            return null;
-        }
-
-        length = match[0].length;
-
-        // The match is confirmed, add the match length to `i`,
-        // and consume any extra white-space characters (' ' || '\n')
-        // which come after that. The reason for this is that LeSS's
-        // grammar is mostly white-space insensitive.
-        //
-        skipWhitespace(length);
-
-        if(typeof(match) === 'string') {
-            return match;
-        } else {
-            return match.length === 1 ? match[0] : match;
-        }
-    }
-
-    // Specialization of $(tok)
-    function $re(tok) {
-        if (i > currentPos) {
-            current = current.slice(i - currentPos);
-            currentPos = i;
-        }
-        var m = tok.exec(current);
-        if (!m) {
-            return null;
-        }
-
-        skipWhitespace(m[0].length);
-        if(typeof m === "string") {
-            return m;
-        }
-
-        return m.length === 1 ? m[0] : m;
-    }
-
-    var _$re = $re;
-
-    // Specialization of $(tok)
-    function $char(tok) {
-        if (input.charAt(i) !== tok) {
-            return null;
-        }
-        skipWhitespace(1);
-        return tok;
-    }
-
-    function skipWhitespace(length) {
-        var oldi = i, oldj = j,
-            curr = i - currentPos,
-            endIndex = i + current.length - curr,
-            mem = (i += length),
-            inp = input,
-            c;
-
-        for (; i < endIndex; i++) {
-            c = inp.charCodeAt(i);
-            if (c > 32) {
-                break;
-            }
-
-            if ((c !== 32) && (c !== 10) && (c !== 9) && (c !== 13)) {
-                break;
-            }
-         }
-
-        current = current.slice(length + i - mem + curr);
-        currentPos = i;
-
-        if (!current.length && (j < chunks.length - 1)) {
-            current = chunks[++j];
-            skipWhitespace(0); // skip space at the beginning of a chunk
-            return true; // things changed
-        }
-
-        return oldi !== i || oldj !== j;
-    }
-
-    function expect(arg, msg, index) {
-        // some older browsers return typeof 'function' for RegExp
-        var result = (Object.prototype.toString.call(arg) === '[object Function]') ? arg.call(parsers) : $(arg);
-        if (result) {
-            return result;
-        }
-        error(msg || (typeof(arg) === 'string' ? "expected '" + arg + "' got '" + input.charAt(i) + "'"
-                                               : "unexpected token"));
-    }
-
-    // Specialization of expect()
-    function expectChar(arg, msg) {
-        if (input.charAt(i) === arg) {
-            skipWhitespace(1);
-            return arg;
-        }
-        error(msg || "expected '" + arg + "' got '" + input.charAt(i) + "'");
-    }
-
-    function error(msg, type) {
-        var e = new Error(msg);
-        e.index = i;
-        e.type = type || 'Syntax';
-        throw e;
-    }
-
-    // Same as $(), but don't change the state of the parser,
-    // just return the match.
-    function peek(tok) {
-        if (typeof(tok) === 'string') {
-            return input.charAt(i) === tok;
-        } else {
-            return tok.test(current);
-        }
-    }
-
-    // Specialization of peek()
-    function peekChar(tok) {
-        return input.charAt(i) === tok;
-    }
-
-
-    function getInput(e, env) {
-        if (e.filename && env.currentFileInfo.filename && (e.filename !== env.currentFileInfo.filename)) {
-            return parser.imports.contents[e.filename];
-        } else {
-            return input;
-        }
-    }
-
-    function getLocation(index, inputStream) {
-        var n = index + 1,
-            line = null,
-            column = -1;
-
-        while (--n >= 0 && inputStream.charAt(n) !== '\n') {
-            column++;
-        }
-
-        if (typeof index === 'number') {
-            line = (inputStream.slice(0, index).match(/\n/g) || "").length;
-        }
-
-        return {
-            line: line,
-            column: column
-        };
-    }
-
-    function getDebugInfo(index, inputStream, env) {
-        var filename = env.currentFileInfo.filename;
-        if(less.mode !== 'browser' && less.mode !== 'rhino') {
-            filename = require('path').resolve(filename);
-        }
-
-        return {
-            lineNumber: getLocation(index, inputStream).line + 1,
-            fileName: filename
-        };
-    }
-
-    function LessError(e, env) {
-        var input = getInput(e, env),
-            loc = getLocation(e.index, input),
-            line = loc.line,
-            col  = loc.column,
-            callLine = e.call && getLocation(e.call, input).line,
-            lines = input.split('\n');
-
-        this.type = e.type || 'Syntax';
-        this.message = e.message;
-        this.filename = e.filename || env.currentFileInfo.filename;
-        this.index = e.index;
-        this.line = typeof(line) === 'number' ? line + 1 : null;
-        this.callLine = callLine + 1;
-        this.callExtract = lines[callLine];
-        this.stack = e.stack;
-        this.column = col;
-        this.extract = [
-            lines[line - 1],
-            lines[line],
-            lines[line + 1]
-        ];
-    }
-
-    LessError.prototype = new Error();
-    LessError.prototype.constructor = LessError;
-
-    this.env = env = env || {};
-
-    // The optimization level dictates the thoroughness of the parser,
-    // the lower the number, the less nodes it will create in the tree.
-    // This could matter for debugging, or if you want to access
-    // the individual nodes in the tree.
-    this.optimization = ('optimization' in this.env) ? this.env.optimization : 1;
-
-    //
-    // The Parser
-    //
-    parser = {
-
-        imports: imports,
-        //
-        // Parse an input string into an abstract syntax tree,
-        // @param str A string containing 'less' markup
-        // @param callback call `callback` when done.
-        // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply
-        //
-        parse: function (str, callback, additionalData) {
-            var root, line, lines, error = null, globalVars, modifyVars, preText = "";
-
-            i = j = currentPos = furthest = 0;
-
-            globalVars = (additionalData && additionalData.globalVars) ? less.Parser.serializeVars(additionalData.globalVars) + '\n' : '';
-            modifyVars = (additionalData && additionalData.modifyVars) ? '\n' + less.Parser.serializeVars(additionalData.modifyVars) : '';
-
-            if (globalVars || (additionalData && additionalData.banner)) {
-                preText = ((additionalData && additionalData.banner) ? additionalData.banner : "") + globalVars;
-                parser.imports.contentsIgnoredChars[env.currentFileInfo.filename] = preText.length;
-            }
-
-            str = str.replace(/\r\n/g, '\n');
-            // Remove potential UTF Byte Order Mark
-            input = str = preText + str.replace(/^\uFEFF/, '') + modifyVars;
-            parser.imports.contents[env.currentFileInfo.filename] = str;
-
-            // Split the input into chunks.
-            chunks = (function (input) {
-                var len = input.length, level = 0, parenLevel = 0,
-                    lastOpening, lastOpeningParen, lastMultiComment, lastMultiCommentEndBrace,
-                    chunks = [], emitFrom = 0,
-                    parserCurrentIndex, currentChunkStartIndex, cc, cc2, matched;
-
-                function fail(msg, index) {
-                    error = new(LessError)({
-                        index: index || parserCurrentIndex,
-                        type: 'Parse',
-                        message: msg,
-                        filename: env.currentFileInfo.filename
-                    }, env);
-                }
-
-                function emitChunk(force) {
-                    var len = parserCurrentIndex - emitFrom;
-                    if (((len < 512) && !force) || !len) {
-                        return;
-                    }
-                    chunks.push(input.slice(emitFrom, parserCurrentIndex + 1));
-                    emitFrom = parserCurrentIndex + 1;
-                }
-
-                for (parserCurrentIndex = 0; parserCurrentIndex < len; parserCurrentIndex++) {
-                    cc = input.charCodeAt(parserCurrentIndex);
-                    if (((cc >= 97) && (cc <= 122)) || (cc < 34)) {
-                        // a-z or whitespace
-                        continue;
-                    }
-
-                    switch (cc) {
-                        case 40:                        // (
-                            parenLevel++;
-                            lastOpeningParen = parserCurrentIndex;
-                            continue;
-                        case 41:                        // )
-                            if (--parenLevel < 0) {
-                                return fail("missing opening `(`");
-                            }
-                            continue;
-                        case 59:                        // ;
-                            if (!parenLevel) { emitChunk(); }
-                            continue;
-                        case 123:                       // {
-                            level++;
-                            lastOpening = parserCurrentIndex;
-                            continue;
-                        case 125:                       // }
-                            if (--level < 0) {
-                                return fail("missing opening `{`");
-                            }
-                            if (!level && !parenLevel) { emitChunk(); }
-                            continue;
-                        case 92:                        // \
-                            if (parserCurrentIndex < len - 1) { parserCurrentIndex++; continue; }
-                            return fail("unescaped `\\`");
-                        case 34:
-                        case 39:
-                        case 96:                        // ", ' and `
-                            matched = 0;
-                            currentChunkStartIndex = parserCurrentIndex;
-                            for (parserCurrentIndex = parserCurrentIndex + 1; parserCurrentIndex < len; parserCurrentIndex++) {
-                                cc2 = input.charCodeAt(parserCurrentIndex);
-                                if (cc2 > 96) { continue; }
-                                if (cc2 == cc) { matched = 1; break; }
-                                if (cc2 == 92) {        // \
-                                    if (parserCurrentIndex == len - 1) {
-                                        return fail("unescaped `\\`");
-                                    }
-                                    parserCurrentIndex++;
-                                }
-                            }
-                            if (matched) { continue; }
-                            return fail("unmatched `" + String.fromCharCode(cc) + "`", currentChunkStartIndex);
-                        case 47:                        // /, check for comment
-                            if (parenLevel || (parserCurrentIndex == len - 1)) { continue; }
-                            cc2 = input.charCodeAt(parserCurrentIndex + 1);
-                            if (cc2 == 47) {
-                                // //, find lnfeed
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if ((cc2 <= 13) && ((cc2 == 10) || (cc2 == 13))) { break; }
-                                }
-                            } else if (cc2 == 42) {
-                                // /*, find */
-                                lastMultiComment = currentChunkStartIndex = parserCurrentIndex;
-                                for (parserCurrentIndex = parserCurrentIndex + 2; parserCurrentIndex < len - 1; parserCurrentIndex++) {
-                                    cc2 = input.charCodeAt(parserCurrentIndex);
-                                    if (cc2 == 125) { lastMultiCommentEndBrace = parserCurrentIndex; }
-                                    if (cc2 != 42) { continue; }
-                                    if (input.charCodeAt(parserCurrentIndex + 1) == 47) { break; }
-                                }
-                                if (parserCurrentIndex == len - 1) {
-                                    return fail("missing closing `*/`", currentChunkStartIndex);
-                                }
-                                parserCurrentIndex++;
-                            }
-                            continue;
-                        case 42:                       // *, check for unmatched */
-                            if ((parserCurrentIndex < len - 1) && (input.charCodeAt(parserCurrentIndex + 1) == 47)) {
-                                return fail("unmatched `/*`");
-                            }
-                            continue;
-                    }
-                }
-
-                if (level !== 0) {
-                    if ((lastMultiComment > lastOpening) && (lastMultiCommentEndBrace > lastMultiComment)) {
-                        return fail("missing closing `}` or `*/`", lastOpening);
-                    } else {
-                        return fail("missing closing `}`", lastOpening);
-                    }
-                } else if (parenLevel !== 0) {
-                    return fail("missing closing `)`", lastOpeningParen);
-                }
-
-                emitChunk(true);
-                return chunks;
-            })(str);
-
-            if (error) {
-                return callback(new(LessError)(error, env));
-            }
-
-            current = chunks[0];
-
-            // Start with the primary rule.
-            // The whole syntax tree is held under a Ruleset node,
-            // with the `root` property set to true, so no `{}` are
-            // output. The callback is called when the input is parsed.
-            try {
-                root = new(tree.Ruleset)(null, this.parsers.primary());
-                root.root = true;
-                root.firstRoot = true;
-            } catch (e) {
-                return callback(new(LessError)(e, env));
-            }
-
-            root.toCSS = (function (evaluate) {
-                return function (options, variables) {
-                    options = options || {};
-                    var evaldRoot,
-                        css,
-                        evalEnv = new tree.evalEnv(options);
-
-                    //
-                    // Allows setting variables with a hash, so:
-                    //
-                    //   `{ color: new(tree.Color)('#f01') }` will become:
-                    //
-                    //   new(tree.Rule)('@color',
-                    //     new(tree.Value)([
-                    //       new(tree.Expression)([
-                    //         new(tree.Color)('#f01')
-                    //       ])
-                    //     ])
-                    //   )
-                    //
-                    if (typeof(variables) === 'object' && !Array.isArray(variables)) {
-                        variables = Object.keys(variables).map(function (k) {
-                            var value = variables[k];
-
-                            if (! (value instanceof tree.Value)) {
-                                if (! (value instanceof tree.Expression)) {
-                                    value = new(tree.Expression)([value]);
-                                }
-                                value = new(tree.Value)([value]);
-                            }
-                            return new(tree.Rule)('@' + k, value, false, null, 0);
-                        });
-                        evalEnv.frames = [new(tree.Ruleset)(null, variables)];
-                    }
-
-                    try {
-                        var preEvalVisitors = [],
-                            visitors = [
-                                new(tree.joinSelectorVisitor)(),
-                                new(tree.processExtendsVisitor)(),
-                                new(tree.toCSSVisitor)({compress: Boolean(options.compress)})
-                            ], i, root = this;
-
-                        if (options.plugins) {
-                            for(i =0; i < options.plugins.length; i++) {
-                                if (options.plugins[i].isPreEvalVisitor) {
-                                    preEvalVisitors.push(options.plugins[i]);
-                                } else {
-                                    if (options.plugins[i].isPreVisitor) {
-                                        visitors.splice(0, 0, options.plugins[i]);
-                                    } else {
-                                        visitors.push(options.plugins[i]);
-                                    }
-                                }
-                            }
-                        }
-
-                        for(i = 0; i < preEvalVisitors.length; i++) {
-                            preEvalVisitors[i].run(root);
-                        }
-
-                        evaldRoot = evaluate.call(root, evalEnv);
-
-                        for(i = 0; i < visitors.length; i++) {
-                            visitors[i].run(evaldRoot);
-                        }
-
-                        if (options.sourceMap) {
-                            evaldRoot = new tree.sourceMapOutput(
-                                {
-                                    contentsIgnoredCharsMap: parser.imports.contentsIgnoredChars,
-                                    writeSourceMap: options.writeSourceMap,
-                                    rootNode: evaldRoot,
-                                    contentsMap: parser.imports.contents,
-                                    sourceMapFilename: options.sourceMapFilename,
-                                    sourceMapURL: options.sourceMapURL,
-                                    outputFilename: options.sourceMapOutputFilename,
-                                    sourceMapBasepath: options.sourceMapBasepath,
-                                    sourceMapRootpath: options.sourceMapRootpath,
-                                    outputSourceFiles: options.outputSourceFiles,
-                                    sourceMapGenerator: options.sourceMapGenerator
-                                });
-                        }
-
-                        css = evaldRoot.toCSS({
-                                compress: Boolean(options.compress),
-                                dumpLineNumbers: env.dumpLineNumbers,
-                                strictUnits: Boolean(options.strictUnits),
-                                numPrecision: 8});
-                    } catch (e) {
-                        throw new(LessError)(e, env);
-                    }
-
-                    if (options.cleancss && less.mode === 'node') {
-                        var CleanCSS = require('clean-css'),
-                            cleancssOptions = options.cleancssOptions || {};
-
-                        if (cleancssOptions.keepSpecialComments === undefined) {
-                            cleancssOptions.keepSpecialComments = "*";
-                        }
-                        cleancssOptions.processImport = false;
-                        cleancssOptions.noRebase = true;
-                        if (cleancssOptions.noAdvanced === undefined) {
-                            cleancssOptions.noAdvanced = true;
-                        }
-
-                        return new CleanCSS(cleancssOptions).minify(css);
-                    } else if (options.compress) {
-                        return css.replace(/(^(\s)+)|((\s)+$)/g, "");
-                    } else {
-                        return css;
-                    }
-                };
-            })(root.eval);
-
-            // If `i` is smaller than the `input.length - 1`,
-            // it means the parser wasn't able to parse the whole
-            // string, so we've got a parsing error.
-            //
-            // We try to extract a \n delimited string,
-            // showing the line where the parse error occured.
-            // We split it up into two parts (the part which parsed,
-            // and the part which didn't), so we can color them differently.
-            if (i < input.length - 1) {
-                i = furthest;
-                var loc = getLocation(i, input);
-                lines = input.split('\n');
-                line = loc.line + 1;
-
-                error = {
-                    type: "Parse",
-                    message: "Unrecognised input",
-                    index: i,
-                    filename: env.currentFileInfo.filename,
-                    line: line,
-                    column: loc.column,
-                    extract: [
-                        lines[line - 2],
-                        lines[line - 1],
-                        lines[line]
-                    ]
-                };
-            }
-
-            var finish = function (e) {
-                e = error || e || parser.imports.error;
-
-                if (e) {
-                    if (!(e instanceof LessError)) {
-                        e = new(LessError)(e, env);
-                    }
-
-                    return callback(e);
-                }
-                else {
-                    return callback(null, root);
-                }
-            };
-
-            if (env.processImports !== false) {
-                new tree.importVisitor(this.imports, finish)
-                    .run(root);
-            } else {
-                return finish();
-            }
-        },
-
-        //
-        // Here in, the parsing rules/functions
-        //
-        // The basic structure of the syntax tree generated is as follows:
-        //
-        //   Ruleset ->  Rule -> Value -> Expression -> Entity
-        //
-        // Here's some Less code:
-        //
-        //    .class {
-        //      color: #fff;
-        //      border: 1px solid #000;
-        //      width: @w + 4px;
-        //      > .child {...}
-        //    }
-        //
-        // And here's what the parse tree might look like:
-        //
-        //     Ruleset (Selector '.class', [
-        //         Rule ("color",  Value ([Expression [Color #fff]]))
-        //         Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
-        //         Rule ("width",  Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
-        //         Ruleset (Selector [Element '>', '.child'], [...])
-        //     ])
-        //
-        //  In general, most rules will try to parse a token with the `$()` function, and if the return
-        //  value is truly, will return a new node, of the relevant type. Sometimes, we need to check
-        //  first, before parsing, that's when we use `peek()`.
-        //
-        parsers: parsers = {
-            //
-            // The `primary` rule is the *entry* and *exit* point of the parser.
-            // The rules here can appear at any level of the parse tree.
-            //
-            // The recursive nature of the grammar is an interplay between the `block`
-            // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
-            // as represented by this simplified grammar:
-            //
-            //     primary  →  (ruleset | rule)+
-            //     ruleset  →  selector+ block
-            //     block    →  '{' primary '}'
-            //
-            // Only at one point is the primary rule not called from the
-            // block rule: at the root level.
-            //
-            primary: function () {
-                var mixin = this.mixin, $re = _$re, root = [], node;
-
-                while (current)
-                {
-                    node = this.extendRule() || mixin.definition() || this.rule() || this.ruleset() ||
-                        mixin.call() || this.comment() || this.rulesetCall() || this.directive();
-                    if (node) {
-                        root.push(node);
-                    } else {
-                        if (!($re(/^[\s\n]+/) || $re(/^;+/))) {
-                            break;
-                        }
-                    }
-                    if (peekChar('}')) {
-                        break;
-                    }
-                }
-
-                return root;
-            },
-
-            // We create a Comment node for CSS comments `/* */`,
-            // but keep the LeSS comments `//` silent, by just skipping
-            // over them.
-            comment: function () {
-                var comment;
-
-                if (input.charAt(i) !== '/') { return; }
-
-                if (input.charAt(i + 1) === '/') {
-                    return new(tree.Comment)($re(/^\/\/.*/), true, i, env.currentFileInfo);
-                }
-                comment = $re(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/);
-                if (comment) {
-                    return new(tree.Comment)(comment, false, i, env.currentFileInfo);
-                }
-            },
-
-            comments: function () {
-                var comment, comments = [];
-
-                while(true) {
-                    comment = this.comment();
-                    if (!comment) {
-                        break;
-                    }
-                    comments.push(comment);
-                }
-
-                return comments;
-            },
-
-            //
-            // Entities are tokens which can be found inside an Expression
-            //
-            entities: {
-                //
-                // A string, which supports escaping " and '
-                //
-                //     "milky way" 'he\'s the one!'
-                //
-                quoted: function () {
-                    var str, j = i, e, index = i;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '"' && input.charAt(j) !== "'") { return; }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/);
-                    if (str) {
-                        return new(tree.Quoted)(str[0], str[1] || str[2], e, index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A catch-all word, such as:
-                //
-                //     black border-collapse
-                //
-                keyword: function () {
-                    var k;
-
-                    k = $re(/^%|^[_A-Za-z-][_A-Za-z0-9-]*/);
-                    if (k) {
-                        var color = tree.Color.fromKeyword(k);
-                        if (color) {
-                            return color;
-                        }
-                        return new(tree.Keyword)(k);
-                    }
-                },
-
-                //
-                // A function call
-                //
-                //     rgb(255, 0, 255)
-                //
-                // We also try to catch IE's `alpha()`, but let the `alpha` parser
-                // deal with the details.
-                //
-                // The arguments are parsed with the `entities.arguments` parser.
-                //
-                call: function () {
-                    var name, nameLC, args, alpha_ret, index = i;
-
-                    name = /^([\w-]+|%|progid:[\w\.]+)\(/.exec(current);
-                    if (!name) { return; }
-
-                    name = name[1];
-                    nameLC = name.toLowerCase();
-                    if (nameLC === 'url') {
-                        return null;
-                    }
-
-                    i += name.length;
-
-                    if (nameLC === 'alpha') {
-                        alpha_ret = parsers.alpha();
-                        if(typeof alpha_ret !== 'undefined') {
-                            return alpha_ret;
-                        }
-                    }
-
-                    $char('('); // Parse the '(' and consume whitespace.
-
-                    args = this.arguments();
-
-                    if (! $char(')')) {
-                        return;
-                    }
-
-                    if (name) { return new(tree.Call)(name, args, index, env.currentFileInfo); }
-                },
-                arguments: function () {
-                    var args = [], arg;
-
-                    while (true) {
-                        arg = this.assignment() || parsers.expression();
-                        if (!arg) {
-                            break;
-                        }
-                        args.push(arg);
-                        if (! $char(',')) {
-                            break;
-                        }
-                    }
-                    return args;
-                },
-                literal: function () {
-                    return this.dimension() ||
-                           this.color() ||
-                           this.quoted() ||
-                           this.unicodeDescriptor();
-                },
-
-                // Assignments are argument entities for calls.
-                // They are present in ie filter properties as shown below.
-                //
-                //     filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
-                //
-
-                assignment: function () {
-                    var key, value;
-                    key = $re(/^\w+(?=\s?=)/i);
-                    if (!key) {
-                        return;
-                    }
-                    if (!$char('=')) {
-                        return;
-                    }
-                    value = parsers.entity();
-                    if (value) {
-                        return new(tree.Assignment)(key, value);
-                    }
-                },
-
-                //
-                // Parse url() tokens
-                //
-                // We use a specific rule for urls, because they don't really behave like
-                // standard function calls. The difference is that the argument doesn't have
-                // to be enclosed within a string, so it can't be parsed as an Expression.
-                //
-                url: function () {
-                    var value;
-
-                    if (input.charAt(i) !== 'u' || !$re(/^url\(/)) {
-                        return;
-                    }
-
-                    value = this.quoted() || this.variable() ||
-                            $re(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) || "";
-
-                    expectChar(')');
-
-                    return new(tree.URL)((value.value != null || value instanceof tree.Variable)
-                                        ? value : new(tree.Anonymous)(value), env.currentFileInfo);
-                },
-
-                //
-                // A Variable entity, such as `@fink`, in
-                //
-                //     width: @fink + 2px
-                //
-                // We use a different parser for variable definitions,
-                // see `parsers.variable`.
-                //
-                variable: function () {
-                    var name, index = i;
-
-                    if (input.charAt(i) === '@' && (name = $re(/^@@?[\w-]+/))) {
-                        return new(tree.Variable)(name, index, env.currentFileInfo);
-                    }
-                },
-
-                // A variable entity useing the protective {} e.g. @{var}
-                variableCurly: function () {
-                    var curly, index = i;
-
-                    if (input.charAt(i) === '@' && (curly = $re(/^@\{([\w-]+)\}/))) {
-                        return new(tree.Variable)("@" + curly[1], index, env.currentFileInfo);
-                    }
-                },
-
-                //
-                // A Hexadecimal color
-                //
-                //     #4F3C2F
-                //
-                // `rgb` and `hsl` colors are parsed through the `entities.call` parser.
-                //
-                color: function () {
-                    var rgb;
-
-                    if (input.charAt(i) === '#' && (rgb = $re(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/))) {
-                        var colorCandidateString = rgb.input.match(/^#([\w]+).*/); // strip colons, brackets, whitespaces and other characters that should not definitely be part of color string
-                        colorCandidateString = colorCandidateString[1];
-                        if (!colorCandidateString.match(/^[A-Fa-f0-9]+$/)) { // verify if candidate consists only of allowed HEX characters
-                            error("Invalid HEX color code");
-                        }
-                        return new(tree.Color)(rgb[1]);
-                    }
-                },
-
-                //
-                // A Dimension, that is, a number and a unit
-                //
-                //     0.5em 95%
-                //
-                dimension: function () {
-                    var value, c = input.charCodeAt(i);
-                    //Is the first char of the dimension 0-9, '.', '+' or '-'
-                    if ((c > 57 || c < 43) || c === 47 || c == 44) {
-                        return;
-                    }
-
-                    value = $re(/^([+-]?\d*\.?\d+)(%|[a-z]+)?/);
-                    if (value) {
-                        return new(tree.Dimension)(value[1], value[2]);
-                    }
-                },
-
-                //
-                // A unicode descriptor, as is used in unicode-range
-                //
-                // U+0??  or U+00A1-00A9
-                //
-                unicodeDescriptor: function () {
-                    var ud;
-
-                    ud = $re(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/);
-                    if (ud) {
-                        return new(tree.UnicodeDescriptor)(ud[0]);
-                    }
-                },
-
-                //
-                // JavaScript code to be evaluated
-                //
-                //     `window.location.href`
-                //
-                javascript: function () {
-                    var str, j = i, e;
-
-                    if (input.charAt(j) === '~') { j++; e = true; } // Escaped strings
-                    if (input.charAt(j) !== '`') { return; }
-                    if (env.javascriptEnabled !== undefined && !env.javascriptEnabled) {
-                        error("You are using JavaScript, which has been disabled.");
-                    }
-
-                    if (e) { $char('~'); }
-
-                    str = $re(/^`([^`]*)`/);
-                    if (str) {
-                        return new(tree.JavaScript)(str[1], i, e);
-                    }
-                }
-            },
-
-            //
-            // The variable part of a variable definition. Used in the `rule` parser
-            //
-            //     @fink:
-            //
-            variable: function () {
-                var name;
-
-                if (input.charAt(i) === '@' && (name = $re(/^(@[\w-]+)\s*:/))) { return name[1]; }
-            },
-
-            //
-            // The variable part of a variable definition. Used in the `rule` parser
-            //
-            //     @fink();
-            //
-            rulesetCall: function () {
-                var name;
-
-                if (input.charAt(i) === '@' && (name = $re(/^(@[\w-]+)\s*\(\s*\)\s*;/))) {
-                    return new tree.RulesetCall(name[1]);
-                }
-            },
-
-            //
-            // extend syntax - used to extend selectors
-            //
-            extend: function(isRule) {
-                var elements, e, index = i, option, extendList, extend;
-
-                if (!(isRule ? $re(/^&:extend\(/) : $re(/^:extend\(/))) { return; }
-
-                do {
-                    option = null;
-                    elements = null;
-                    while (! (option = $re(/^(all)(?=\s*(\)|,))/))) {
-                        e = this.element();
-                        if (!e) { break; }
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                    }
-
-                    option = option && option[1];
-                    if (!elements)
-                        error("Missing target selector for :extend().");
-                    extend = new(tree.Extend)(new(tree.Selector)(elements), option, index);
-                    if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-
-                } while($char(","));
-
-                expect(/^\)/);
-
-                if (isRule) {
-                    expect(/^;/);
-                }
-
-                return extendList;
-            },
-
-            //
-            // extendRule - used in a rule to extend all the parent selectors
-            //
-            extendRule: function() {
-                return this.extend(true);
-            },
-
-            //
-            // Mixins
-            //
-            mixin: {
-                //
-                // A Mixin call, with an optional argument list
-                //
-                //     #mixins > .square(#fff);
-                //     .rounded(4px, black);
-                //     .button;
-                //
-                // The `while` loop is there because mixins can be
-                // namespaced, but we only support the child and descendant
-                // selector for now.
-                //
-                call: function () {
-                    var s = input.charAt(i), important = false, index = i, elemIndex,
-                        elements, elem, e, c, args;
-
-                    if (s !== '.' && s !== '#') { return; }
-
-                    save(); // stop us absorbing part of an invalid selector
-
-                    while (true) {
-                        elemIndex = i;
-                        e = $re(/^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/);
-                        if (!e) {
-                            break;
-                        }
-                        elem = new(tree.Element)(c, e, elemIndex, env.currentFileInfo);
-                        if (elements) { elements.push(elem); } else { elements = [ elem ]; }
-                        c = $char('>');
-                    }
-
-                    if (elements) {
-                        if ($char('(')) {
-                            args = this.args(true).args;
-                            expectChar(')');
-                        }
-
-                        if (parsers.important()) {
-                            important = true;
-                        }
-
-                        if (parsers.end()) {
-                            forget();
-                            return new(tree.mixin.Call)(elements, args, index, env.currentFileInfo, important);
-                        }
-                    }
-
-                    restore();
-                },
-                args: function (isCall) {
-                    var parsers = parser.parsers, entities = parsers.entities,
-                        returner = { args:null, variadic: false },
-                        expressions = [], argsSemiColon = [], argsComma = [],
-                        isSemiColonSeperated, expressionContainsNamed, name, nameLoop, value, arg;
-
-                    save();
-
-                    while (true) {
-                        if (isCall) {
-                            arg = parsers.detachedRuleset() || parsers.expression();
-                        } else {
-                            parsers.comments();
-                            if (input.charAt(i) === '.' && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ variadic: true });
-                                break;
-                            }
-                            arg = entities.variable() || entities.literal() || entities.keyword();
-                        }
-
-                        if (!arg) {
-                            break;
-                        }
-
-                        nameLoop = null;
-                        if (arg.throwAwayComments) {
-                            arg.throwAwayComments();
-                        }
-                        value = arg;
-                        var val = null;
-
-                        if (isCall) {
-                            // Variable
-                            if (arg.value && arg.value.length == 1) {
-                                val = arg.value[0];
-                            }
-                        } else {
-                            val = arg;
-                        }
-
-                        if (val && val instanceof tree.Variable) {
-                            if ($char(':')) {
-                                if (expressions.length > 0) {
-                                    if (isSemiColonSeperated) {
-                                        error("Cannot mix ; and , as delimiter types");
-                                    }
-                                    expressionContainsNamed = true;
-                                }
-
-                                // we do not support setting a ruleset as a default variable - it doesn't make sense
-                                // However if we do want to add it, there is nothing blocking it, just don't error
-                                // and remove isCall dependency below
-                                value = (isCall && parsers.detachedRuleset()) || parsers.expression();
-
-                                if (!value) {
-                                    if (isCall) {
-                                        error("could not understand value for named argument");
-                                    } else {
-                                        restore();
-                                        returner.args = [];
-                                        return returner;
-                                    }
-                                }
-                                nameLoop = (name = val.name);
-                            } else if (!isCall && $re(/^\.{3}/)) {
-                                returner.variadic = true;
-                                if ($char(";") && !isSemiColonSeperated) {
-                                    isSemiColonSeperated = true;
-                                }
-                                (isSemiColonSeperated ? argsSemiColon : argsComma)
-                                    .push({ name: arg.name, variadic: true });
-                                break;
-                            } else if (!isCall) {
-                                name = nameLoop = val.name;
-                                value = null;
-                            }
-                        }
-
-                        if (value) {
-                            expressions.push(value);
-                        }
-
-                        argsComma.push({ name:nameLoop, value:value });
-
-                        if ($char(',')) {
-                            continue;
-                        }
-
-                        if ($char(';') || isSemiColonSeperated) {
-
-                            if (expressionContainsNamed) {
-                                error("Cannot mix ; and , as delimiter types");
-                            }
-
-                            isSemiColonSeperated = true;
-
-                            if (expressions.length > 1) {
-                                value = new(tree.Value)(expressions);
-                            }
-                            argsSemiColon.push({ name:name, value:value });
-
-                            name = null;
-                            expressions = [];
-                            expressionContainsNamed = false;
-                        }
-                    }
-
-                    forget();
-                    returner.args = isSemiColonSeperated ? argsSemiColon : argsComma;
-                    return returner;
-                },
-                //
-                // A Mixin definition, with a list of parameters
-                //
-                //     .rounded (@radius: 2px, @color) {
-                //        ...
-                //     }
-                //
-                // Until we have a finer grained state-machine, we have to
-                // do a look-ahead, to make sure we don't have a mixin call.
-                // See the `rule` function for more information.
-                //
-                // We start by matching `.rounded (`, and then proceed on to
-                // the argument list, which has optional default values.
-                // We store the parameters in `params`, with a `value` key,
-                // if there is a value, such as in the case of `@radius`.
-                //
-                // Once we've got our params list, and a closing `)`, we parse
-                // the `{...}` block.
-                //
-                definition: function () {
-                    var name, params = [], match, ruleset, cond, variadic = false;
-                    if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
-                        peek(/^[^{]*\}/)) {
-                        return;
-                    }
-
-                    save();
-
-                    match = $re(/^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/);
-                    if (match) {
-                        name = match[1];
-
-                        var argInfo = this.args(false);
-                        params = argInfo.args;
-                        variadic = argInfo.variadic;
-
-                        // .mixincall("@{a}");
-                        // looks a bit like a mixin definition..
-                        // also
-                        // .mixincall(@a: {rule: set;});
-                        // so we have to be nice and restore
-                        if (!$char(')')) {
-                            furthest = i;
-                            restore();
-                            return;
-                        }
-
-                        parsers.comments();
-
-                        if ($re(/^when/)) { // Guard
-                            cond = expect(parsers.conditions, 'expected condition');
-                        }
-
-                        ruleset = parsers.block();
-
-                        if (ruleset) {
-                            forget();
-                            return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);
-                        } else {
-                            restore();
-                        }
-                    } else {
-                        forget();
-                    }
-                }
-            },
-
-            //
-            // Entities are the smallest recognized token,
-            // and can be found inside a rule's value.
-            //
-            entity: function () {
-                var entities = this.entities;
-
-                return entities.literal() || entities.variable() || entities.url() ||
-                       entities.call()    || entities.keyword()  || entities.javascript() ||
-                       this.comment();
-            },
-
-            //
-            // A Rule terminator. Note that we use `peek()` to check for '}',
-            // because the `block` rule will be expecting it, but we still need to make sure
-            // it's there, if ';' was ommitted.
-            //
-            end: function () {
-                return $char(';') || peekChar('}');
-            },
-
-            //
-            // IE's alpha function
-            //
-            //     alpha(opacity=88)
-            //
-            alpha: function () {
-                var value;
-
-                if (! $re(/^\(opacity=/i)) { return; }
-                value = $re(/^\d+/) || this.entities.variable();
-                if (value) {
-                    expectChar(')');
-                    return new(tree.Alpha)(value);
-                }
-            },
-
-            //
-            // A Selector Element
-            //
-            //     div
-            //     + h1
-            //     #socks
-            //     input[type="text"]
-            //
-            // Elements are the building blocks for Selectors,
-            // they are made out of a `Combinator` (see combinator rule),
-            // and an element name, such as a tag a class, or `*`.
-            //
-            element: function () {
-                var e, c, v, index = i;
-
-                c = this.combinator();
-
-                e = $re(/^(?:\d+\.\d+|\d+)%/) || $re(/^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||
-                    $char('*') || $char('&') || this.attribute() || $re(/^\([^()@]+\)/) || $re(/^[\.#](?=@)/) ||
-                    this.entities.variableCurly();
-
-                if (! e) {
-                    save();
-                    if ($char('(')) {
-                        if ((v = this.selector()) && $char(')')) {
-                            e = new(tree.Paren)(v);
-                            forget();
-                        } else {
-                            restore();
-                        }
-                    } else {
-                        forget();
-                    }
-                }
-
-                if (e) { return new(tree.Element)(c, e, index, env.currentFileInfo); }
-            },
-
-            //
-            // Combinators combine elements together, in a Selector.
-            //
-            // Because our parser isn't white-space sensitive, special care
-            // has to be taken, when parsing the descendant combinator, ` `,
-            // as it's an empty space. We have to check the previous character
-            // in the input, to see if it's a ` ` character. More info on how
-            // we deal with this in *combinator.js*.
-            //
-            combinator: function () {
-                var c = input.charAt(i);
-
-                if (c === '/') {
-                    save();
-                    var slashedCombinator = $re(/^\/[a-z]+\//i);
-                    if (slashedCombinator) {
-                        forget();
-                        return new(tree.Combinator)(slashedCombinator);
-                    }
-                    restore();
-                }
-
-                if (c === '>' || c === '+' || c === '~' || c === '|' || c === '^') {
-                    i++;
-                    if (c === '^' && input.charAt(i) === '^') {
-                        c = '^^';
-                        i++;
-                    }
-                    while (isWhitespace(input, i)) { i++; }
-                    return new(tree.Combinator)(c);
-                } else if (isWhitespace(input, i - 1)) {
-                    return new(tree.Combinator)(" ");
-                } else {
-                    return new(tree.Combinator)(null);
-                }
-            },
-            //
-            // A CSS selector (see selector below)
-            // with less extensions e.g. the ability to extend and guard
-            //
-            lessSelector: function () {
-                return this.selector(true);
-            },
-            //
-            // A CSS Selector
-            //
-            //     .class > div + h1
-            //     li a:hover
-            //
-            // Selectors are made out of one or more Elements, see above.
-            //
-            selector: function (isLess) {
-                var index = i, $re = _$re, elements, extendList, c, e, extend, when, condition;
-
-                while ((isLess && (extend = this.extend())) || (isLess && (when = $re(/^when/))) || (e = this.element())) {
-                    if (when) {
-                        condition = expect(this.conditions, 'expected condition');
-                    } else if (condition) {
-                        error("CSS guard can only be used at the end of selector");
-                    } else if (extend) {
-                        if (extendList) { extendList.push(extend); } else { extendList = [ extend ]; }
-                    } else {
-                        if (extendList) { error("Extend can only be used at the end of selector"); }
-                        c = input.charAt(i);
-                        if (elements) { elements.push(e); } else { elements = [ e ]; }
-                        e = null;
-                    }
-                    if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') {
-                        break;
-                    }
-                }
-
-                if (elements) { return new(tree.Selector)(elements, extendList, condition, index, env.currentFileInfo); }
-                if (extendList) { error("Extend must be used to extend a selector, it cannot be used on its own"); }
-            },
-            attribute: function () {
-                if (! $char('[')) { return; }
-
-                var entities = this.entities,
-                    key, val, op;
-
-                if (!(key = entities.variableCurly())) {
-                    key = expect(/^(?:[_A-Za-z0-9-\*]*\|)?(?:[_A-Za-z0-9-]|\\.)+/);
-                }
-
-                op = $re(/^[|~*$^]?=/);
-                if (op) {
-                    val = entities.quoted() || $re(/^[0-9]+%/) || $re(/^[\w-]+/) || entities.variableCurly();
-                }
-
-                expectChar(']');
-
-                return new(tree.Attribute)(key, op, val);
-            },
-
-            //
-            // The `block` rule is used by `ruleset` and `mixin.definition`.
-            // It's a wrapper around the `primary` rule, with added `{}`.
-            //
-            block: function () {
-                var content;
-                if ($char('{') && (content = this.primary()) && $char('}')) {
-                    return content;
-                }
-            },
-
-            blockRuleset: function() {
-                var block = this.block();
-
-                if (block) {
-                    block = new tree.Ruleset(null, block);
-                }
-                return block;
-            },
-
-            detachedRuleset: function() {
-                var blockRuleset = this.blockRuleset();
-                if (blockRuleset) {
-                    return new tree.DetachedRuleset(blockRuleset);
-                }
-            },
-
-            //
-            // div, .class, body > p {...}
-            //
-            ruleset: function () {
-                var selectors, s, rules, debugInfo;
-
-                save();
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                while (true) {
-                    s = this.lessSelector();
-                    if (!s) {
-                        break;
-                    }
-                    if (selectors) { selectors.push(s); } else { selectors = [ s ]; }
-                    this.comments();
-                    if (s.condition && selectors.length > 1) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    if (! $char(',')) { break; }
-                    if (s.condition) {
-                        error("Guards are only currently allowed on a single selector.");
-                    }
-                    this.comments();
-                }
-
-                if (selectors && (rules = this.block())) {
-                    forget();
-                    var ruleset = new(tree.Ruleset)(selectors, rules, env.strictImports);
-                    if (env.dumpLineNumbers) {
-                        ruleset.debugInfo = debugInfo;
-                    }
-                    return ruleset;
-                } else {
-                    // Backtrack
-                    furthest = i;
-                    restore();
-                }
-            },
-            rule: function (tryAnonymous) {
-                var name, value, startOfRule = i, c = input.charAt(startOfRule), important, merge, isVariable;
-
-                if (c === '.' || c === '#' || c === '&') { return; }
-
-                save();
-
-                name = this.variable() || this.ruleProperty();
-                if (name) {
-                    isVariable = typeof name === "string";
-
-                    if (isVariable) {
-                        value = this.detachedRuleset();
-                    }
-
-                    this.comments();
-                    if (!value) {
-                        // prefer to try to parse first if its a variable or we are compressing
-                        // but always fallback on the other one
-                        value = !tryAnonymous && (env.compress || isVariable) ?
-                            (this.value() || this.anonymousValue()) :
-                            (this.anonymousValue() || this.value());
-
-                        important = this.important();
-
-                        // a name returned by this.ruleProperty() is always an array of the form:
-                        // [string-1, ..., string-n, ""] or [string-1, ..., string-n, "+"]
-                        // where each item is a tree.Keyword or tree.Variable
-                        merge = !isVariable && name.pop().value;
-                    }
-
-                    if (value && this.end()) {
-                        forget();
-                        return new (tree.Rule)(name, value, important, merge, startOfRule, env.currentFileInfo);
-                    } else {
-                        furthest = i;
-                        restore();
-                        if (value && !tryAnonymous) {
-                            return this.rule(true);
-                        }
-                    }
-                } else {
-                    forget();
-                }
-            },
-            anonymousValue: function () {
-                var match;
-                match = /^([^@+\/'"*`(;{}-]*);/.exec(current);
-                if (match) {
-                    i += match[0].length - 1;
-                    return new(tree.Anonymous)(match[1]);
-                }
-            },
-
-            //
-            // An @import directive
-            //
-            //     @import "lib";
-            //
-            // Depending on our environment, importing is done differently:
-            // In the browser, it's an XHR request, in Node, it would be a
-            // file-system operation. The function used for importing is
-            // stored in `import`, which we pass to the Import constructor.
-            //
-            "import": function () {
-                var path, features, index = i;
-
-                var dir = $re(/^@import?\s+/);
-
-                if (dir) {
-                    var options = (dir ? this.importOptions() : null) || {};
-
-                    if ((path = this.entities.quoted() || this.entities.url())) {
-                        features = this.mediaFeatures();
-
-                        if (!$(';')) {
-                            i = index;
-                            error("missing semi-colon or unrecognised media features on import");
-                        }
-                        features = features && new(tree.Value)(features);
-                        return new(tree.Import)(path, features, options, index, env.currentFileInfo);
-                    }
-                    else
-                    {
-                        i = index;
-                        error("malformed import statement");
-                    }
-                }
-            },
-
-            importOptions: function() {
-                var o, options = {}, optionName, value;
-
-                // list of options, surrounded by parens
-                if (! $char('(')) { return null; }
-                do {
-                    o = this.importOption();
-                    if (o) {
-                        optionName = o;
-                        value = true;
-                        switch(optionName) {
-                            case "css":
-                                optionName = "less";
-                                value = false;
-                            break;
-                            case "once":
-                                optionName = "multiple";
-                                value = false;
-                            break;
-                        }
-                        options[optionName] = value;
-                        if (! $char(',')) { break; }
-                    }
-                } while (o);
-                expectChar(')');
-                return options;
-            },
-
-            importOption: function() {
-                var opt = $re(/^(less|css|multiple|once|inline|reference)/);
-                if (opt) {
-                    return opt[1];
-                }
-            },
-
-            mediaFeature: function () {
-                var entities = this.entities, nodes = [], e, p;
-                do {
-                    e = entities.keyword() || entities.variable();
-                    if (e) {
-                        nodes.push(e);
-                    } else if ($char('(')) {
-                        p = this.property();
-                        e = this.value();
-                        if ($char(')')) {
-                            if (p && e) {
-                                nodes.push(new(tree.Paren)(new(tree.Rule)(p, e, null, null, i, env.currentFileInfo, true)));
-                            } else if (e) {
-                                nodes.push(new(tree.Paren)(e));
-                            } else {
-                                return null;
-                            }
-                        } else { return null; }
-                    }
-                } while (e);
-
-                if (nodes.length > 0) {
-                    return new(tree.Expression)(nodes);
-                }
-            },
-
-            mediaFeatures: function () {
-                var entities = this.entities, features = [], e;
-                do {
-                    e = this.mediaFeature();
-                    if (e) {
-                        features.push(e);
-                        if (! $char(',')) { break; }
-                    } else {
-                        e = entities.variable();
-                        if (e) {
-                            features.push(e);
-                            if (! $char(',')) { break; }
-                        }
-                    }
-                } while (e);
-
-                return features.length > 0 ? features : null;
-            },
-
-            media: function () {
-                var features, rules, media, debugInfo;
-
-                if (env.dumpLineNumbers) {
-                    debugInfo = getDebugInfo(i, input, env);
-                }
-
-                if ($re(/^@media/)) {
-                    features = this.mediaFeatures();
-
-                    rules = this.block();
-                    if (rules) {
-                        media = new(tree.Media)(rules, features, i, env.currentFileInfo);
-                        if (env.dumpLineNumbers) {
-                            media.debugInfo = debugInfo;
-                        }
-                        return media;
-                    }
-                }
-            },
-
-            //
-            // A CSS Directive
-            //
-            //     @charset "utf-8";
-            //
-            directive: function () {
-                var index = i, name, value, rules, nonVendorSpecificName,
-                    hasIdentifier, hasExpression, hasUnknown, hasBlock = true;
-
-                if (input.charAt(i) !== '@') { return; }
-
-                value = this['import']() || this.media();
-                if (value) {
-                    return value;
-                }
-
-                save();
-
-                name = $re(/^@[a-z-]+/);
-
-                if (!name) { return; }
-
-                nonVendorSpecificName = name;
-                if (name.charAt(1) == '-' && name.indexOf('-', 2) > 0) {
-                    nonVendorSpecificName = "@" + name.slice(name.indexOf('-', 2) + 1);
-                }
-
-                switch(nonVendorSpecificName) {
-                    /*
-                    case "@font-face":
-                    case "@viewport":
-                    case "@top-left":
-                    case "@top-left-corner":
-                    case "@top-center":
-                    case "@top-right":
-                    case "@top-right-corner":
-                    case "@bottom-left":
-                    case "@bottom-left-corner":
-                    case "@bottom-center":
-                    case "@bottom-right":
-                    case "@bottom-right-corner":
-                    case "@left-top":
-                    case "@left-middle":
-                    case "@left-bottom":
-                    case "@right-top":
-                    case "@right-middle":
-                    case "@right-bottom":
-                        hasBlock = true;
-                        break;
-                    */
-                    case "@charset":
-                        hasIdentifier = true;
-                        hasBlock = false;
-                        break;
-                    case "@namespace":
-                        hasExpression = true;
-                        hasBlock = false;
-                        break;
-                    case "@keyframes":
-                        hasIdentifier = true;
-                        break;
-                    case "@host":
-                    case "@page":
-                    case "@document":
-                    case "@supports":
-                        hasUnknown = true;
-                        break;
-                }
-
-                this.comments();
-
-                if (hasIdentifier) {
-                    value = this.entity();
-                    if (!value) {
-                        error("expected " + name + " identifier");
-                    }
-                } else if (hasExpression) {
-                    value = this.expression();
-                    if (!value) {
-                        error("expected " + name + " expression");
-                    }
-                } else if (hasUnknown) {
-                    value = ($re(/^[^{;]+/) || '').trim();
-                    if (value) {
-                        value = new(tree.Anonymous)(value);
-                    }
-                }
-
-                this.comments();
-
-                if (hasBlock) {
-                    rules = this.blockRuleset();
-                }
-
-                if (rules || (!hasBlock && value && $char(';'))) {
-                    forget();
-                    return new(tree.Directive)(name, value, rules, index, env.currentFileInfo,
-                        env.dumpLineNumbers ? getDebugInfo(index, input, env) : null);
-                }
-
-                restore();
-            },
-
-            //
-            // A Value is a comma-delimited list of Expressions
-            //
-            //     font-family: Baskerville, Georgia, serif;
-            //
-            // In a Rule, a Value represents everything after the `:`,
-            // and before the `;`.
-            //
-            value: function () {
-                var e, expressions = [];
-
-                do {
-                    e = this.expression();
-                    if (e) {
-                        expressions.push(e);
-                        if (! $char(',')) { break; }
-                    }
-                } while(e);
-
-                if (expressions.length > 0) {
-                    return new(tree.Value)(expressions);
-                }
-            },
-            important: function () {
-                if (input.charAt(i) === '!') {
-                    return $re(/^! *important/);
-                }
-            },
-            sub: function () {
-                var a, e;
-
-                if ($char('(')) {
-                    a = this.addition();
-                    if (a) {
-                        e = new(tree.Expression)([a]);
-                        expectChar(')');
-                        e.parens = true;
-                        return e;
-                    }
-                }
-            },
-            multiplication: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.operand();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        if (peek(/^\/[*\/]/)) {
-                            break;
-                        }
-
-                        save();
-
-                        op = $char('/') || $char('*');
-
-                        if (!op) { forget(); break; }
-
-                        a = this.operand();
-
-                        if (!a) { restore(); break; }
-                        forget();
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            addition: function () {
-                var m, a, op, operation, isSpaced;
-                m = this.multiplication();
-                if (m) {
-                    isSpaced = isWhitespace(input, i - 1);
-                    while (true) {
-                        op = $re(/^[-+]\s+/) || (!isSpaced && ($char('+') || $char('-')));
-                        if (!op) {
-                            break;
-                        }
-                        a = this.multiplication();
-                        if (!a) {
-                            break;
-                        }
-
-                        m.parensInOp = true;
-                        a.parensInOp = true;
-                        operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
-                        isSpaced = isWhitespace(input, i - 1);
-                    }
-                    return operation || m;
-                }
-            },
-            conditions: function () {
-                var a, b, index = i, condition;
-
-                a = this.condition();
-                if (a) {
-                    while (true) {
-                        if (!peek(/^,\s*(not\s*)?\(/) || !$char(',')) {
-                            break;
-                        }
-                        b = this.condition();
-                        if (!b) {
-                            break;
-                        }
-                        condition = new(tree.Condition)('or', condition || a, b, index);
-                    }
-                    return condition || a;
-                }
-            },
-            condition: function () {
-                var entities = this.entities, index = i, negate = false,
-                    a, b, c, op;
-
-                if ($re(/^not/)) { negate = true; }
-                expectChar('(');
-                a = this.addition() || entities.keyword() || entities.quoted();
-                if (a) {
-                    op = $re(/^(?:>=|<=|=<|[<=>])/);
-                    if (op) {
-                        b = this.addition() || entities.keyword() || entities.quoted();
-                        if (b) {
-                            c = new(tree.Condition)(op, a, b, index, negate);
-                        } else {
-                            error('expected expression');
-                        }
-                    } else {
-                        c = new(tree.Condition)('=', a, new(tree.Keyword)('true'), index, negate);
-                    }
-                    expectChar(')');
-                    return $re(/^and/) ? new(tree.Condition)('and', c, this.condition()) : c;
-                }
-            },
-
-            //
-            // An operand is anything that can be part of an operation,
-            // such as a Color, or a Variable
-            //
-            operand: function () {
-                var entities = this.entities,
-                    p = input.charAt(i + 1), negate;
-
-                if (input.charAt(i) === '-' && (p === '@' || p === '(')) { negate = $char('-'); }
-                var o = this.sub() || entities.dimension() ||
-                        entities.color() || entities.variable() ||
-                        entities.call();
-
-                if (negate) {
-                    o.parensInOp = true;
-                    o = new(tree.Negative)(o);
-                }
-
-                return o;
-            },
-
-            //
-            // Expressions either represent mathematical operations,
-            // or white-space delimited Entities.
-            //
-            //     1px solid black
-            //     @var * 2
-            //
-            expression: function () {
-                var entities = [], e, delim;
-
-                do {
-                    e = this.addition() || this.entity();
-                    if (e) {
-                        entities.push(e);
-                        // operations do not allow keyword "/" dimension (e.g. small/20px) so we support that here
-                        if (!peek(/^\/[\/*]/)) {
-                            delim = $char('/');
-                            if (delim) {
-                                entities.push(new(tree.Anonymous)(delim));
-                            }
-                        }
-                    }
-                } while (e);
-                if (entities.length > 0) {
-                    return new(tree.Expression)(entities);
-                }
-            },
-            property: function () {
-                var name = $re(/^(\*?-?[_a-zA-Z0-9-]+)\s*:/);
-                if (name) {
-                    return name[1];
-                }
-            },
-            ruleProperty: function () {
-                var c = current, name = [], index = [], length = 0, s, k;
-
-                function match(re) {
-                    var a = re.exec(c);
-                    if (a) {
-                        index.push(i + length);
-                        length += a[0].length;
-                        c = c.slice(a[1].length);
-                        return name.push(a[1]);
-                    }
-                }
-                function cutOutBlockComments() {
-                    //match block comments
-                    var a = /^\s*\/\*(?:[^*]|\*+[^\/*])*\*+\//.exec(c);
-                    if (a) {
-                        length += a[0].length;
-                        c = c.slice(a[0].length);
-                        return true;
-                    }
-                    return false;
-                }
-
-                match(/^(\*?)/);
-                while (match(/^((?:[\w-]+)|(?:@\{[\w-]+\}))/)); // !
-                while (cutOutBlockComments());
-                if ((name.length > 1) && match(/^\s*((?:\+_|\+)?)\s*:/)) {
-                    // at last, we have the complete match now. move forward,
-                    // convert name particles to tree objects and return:
-                    skipWhitespace(length);
-                    if (name[0] === '') {
-                        name.shift();
-                        index.shift();
-                    }
-                    for (k = 0; k < name.length; k++) {
-                        s = name[k];
-                        name[k] = (s.charAt(0) !== '@')
-                            ? new(tree.Keyword)(s)
-                            : new(tree.Variable)('@' + s.slice(2, -1),
-                                index[k], env.currentFileInfo);
-                    }
-                    return name;
-                }
-            }
-        }
-    };
-    return parser;
-};
-less.Parser.serializeVars = function(vars) {
-    var s = '';
-
-    for (var name in vars) {
-        if (Object.hasOwnProperty.call(vars, name)) {
-            var value = vars[name];
-            s += ((name[0] === '@') ? '' : '@') + name +': '+ value +
-                    ((('' + value).slice(-1) === ';') ? '' : ';');
-        }
-    }
-
-    return s;
-};
-
-(function (tree) {
-
-tree.functions = {
-    rgb: function (r, g, b) {
-        return this.rgba(r, g, b, 1.0);
-    },
-    rgba: function (r, g, b, a) {
-        var rgb = [r, g, b].map(function (c) { return scaled(c, 255); });
-        a = number(a);
-        return new(tree.Color)(rgb, a);
-    },
-    hsl: function (h, s, l) {
-        return this.hsla(h, s, l, 1.0);
-    },
-    hsla: function (h, s, l, a) {
-        function hue(h) {
-            h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
-            if      (h * 6 < 1) { return m1 + (m2 - m1) * h * 6; }
-            else if (h * 2 < 1) { return m2; }
-            else if (h * 3 < 2) { return m1 + (m2 - m1) * (2/3 - h) * 6; }
-            else                { return m1; }
-        }
-
-        h = (number(h) % 360) / 360;
-        s = clamp(number(s)); l = clamp(number(l)); a = clamp(number(a));
-
-        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
-        var m1 = l * 2 - m2;
-
-        return this.rgba(hue(h + 1/3) * 255,
-                         hue(h)       * 255,
-                         hue(h - 1/3) * 255,
-                         a);
-    },
-
-    hsv: function(h, s, v) {
-        return this.hsva(h, s, v, 1.0);
-    },
-
-    hsva: function(h, s, v, a) {
-        h = ((number(h) % 360) / 360) * 360;
-        s = number(s); v = number(v); a = number(a);
-
-        var i, f;
-        i = Math.floor((h / 60) % 6);
-        f = (h / 60) - i;
-
-        var vs = [v,
-                  v * (1 - s),
-                  v * (1 - f * s),
-                  v * (1 - (1 - f) * s)];
-        var perm = [[0, 3, 1],
-                    [2, 0, 1],
-                    [1, 0, 3],
-                    [1, 2, 0],
-                    [3, 1, 0],
-                    [0, 1, 2]];
-
-        return this.rgba(vs[perm[i][0]] * 255,
-                         vs[perm[i][1]] * 255,
-                         vs[perm[i][2]] * 255,
-                         a);
-    },
-
-    hue: function (color) {
-        return new(tree.Dimension)(color.toHSL().h);
-    },
-    saturation: function (color) {
-        return new(tree.Dimension)(color.toHSL().s * 100, '%');
-    },
-    lightness: function (color) {
-        return new(tree.Dimension)(color.toHSL().l * 100, '%');
-    },
-    hsvhue: function(color) {
-        return new(tree.Dimension)(color.toHSV().h);
-    },
-    hsvsaturation: function (color) {
-        return new(tree.Dimension)(color.toHSV().s * 100, '%');
-    },
-    hsvvalue: function (color) {
-        return new(tree.Dimension)(color.toHSV().v * 100, '%');
-    },
-    red: function (color) {
-        return new(tree.Dimension)(color.rgb[0]);
-    },
-    green: function (color) {
-        return new(tree.Dimension)(color.rgb[1]);
-    },
-    blue: function (color) {
-        return new(tree.Dimension)(color.rgb[2]);
-    },
-    alpha: function (color) {
-        return new(tree.Dimension)(color.toHSL().a);
-    },
-    luma: function (color) {
-        return new(tree.Dimension)(color.luma() * color.alpha * 100, '%');
-    },
-    luminance: function (color) {
-        var luminance =
-            (0.2126 * color.rgb[0] / 255)
-          + (0.7152 * color.rgb[1] / 255)
-          + (0.0722 * color.rgb[2] / 255);
-
-        return new(tree.Dimension)(luminance * color.alpha * 100, '%');
-    },
-    saturate: function (color, amount) {
-        // filter: saturate(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        var hsl = color.toHSL();
-
-        hsl.s += amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    desaturate: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.s -= amount.value / 100;
-        hsl.s = clamp(hsl.s);
-        return hsla(hsl);
-    },
-    lighten: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l += amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    darken: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.l -= amount.value / 100;
-        hsl.l = clamp(hsl.l);
-        return hsla(hsl);
-    },
-    fadein: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a += amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fadeout: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a -= amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    fade: function (color, amount) {
-        var hsl = color.toHSL();
-
-        hsl.a = amount.value / 100;
-        hsl.a = clamp(hsl.a);
-        return hsla(hsl);
-    },
-    spin: function (color, amount) {
-        var hsl = color.toHSL();
-        var hue = (hsl.h + amount.value) % 360;
-
-        hsl.h = hue < 0 ? 360 + hue : hue;
-
-        return hsla(hsl);
-    },
-    //
-    // Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
-    // http://sass-lang.com
-    //
-    mix: function (color1, color2, weight) {
-        if (!weight) {
-            weight = new(tree.Dimension)(50);
-        }
-        var p = weight.value / 100.0;
-        var w = p * 2 - 1;
-        var a = color1.toHSL().a - color2.toHSL().a;
-
-        var w1 = (((w * a == -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
-        var w2 = 1 - w1;
-
-        var rgb = [color1.rgb[0] * w1 + color2.rgb[0] * w2,
-                   color1.rgb[1] * w1 + color2.rgb[1] * w2,
-                   color1.rgb[2] * w1 + color2.rgb[2] * w2];
-
-        var alpha = color1.alpha * p + color2.alpha * (1 - p);
-
-        return new(tree.Color)(rgb, alpha);
-    },
-    greyscale: function (color) {
-        return this.desaturate(color, new(tree.Dimension)(100));
-    },
-    contrast: function (color, dark, light, threshold) {
-        // filter: contrast(3.2);
-        // should be kept as is, so check for color
-        if (!color.rgb) {
-            return null;
-        }
-        if (typeof light === 'undefined') {
-            light = this.rgba(255, 255, 255, 1.0);
-        }
-        if (typeof dark === 'undefined') {
-            dark = this.rgba(0, 0, 0, 1.0);
-        }
-        //Figure out which is actually light and dark!
-        if (dark.luma() > light.luma()) {
-            var t = light;
-            light = dark;
-            dark = t;
-        }
-        if (typeof threshold === 'undefined') {
-            threshold = 0.43;
-        } else {
-            threshold = number(threshold);
-        }
-        if (color.luma() < threshold) {
-            return light;
-        } else {
-            return dark;
-        }
-    },
-    e: function (str) {
-        return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str.value);
-    },
-    escape: function (str) {
-        return new(tree.Anonymous)(encodeURI(str.value).replace(/=/g, "%3D").replace(/:/g, "%3A").replace(/#/g, "%23").replace(/;/g, "%3B").replace(/\(/g, "%28").replace(/\)/g, "%29"));
-    },
-    replace: function (string, pattern, replacement, flags) {
-        var result = string.value;
-
-        result = result.replace(new RegExp(pattern.value, flags ? flags.value : ''), replacement.value);
-        return new(tree.Quoted)(string.quote || '', result, string.escaped);
-    },
-    '%': function (string /* arg, arg, ...*/) {
-        var args = Array.prototype.slice.call(arguments, 1),
-            result = string.value;
-
-        for (var i = 0; i < args.length; i++) {
-            /*jshint loopfunc:true */
-            result = result.replace(/%[sda]/i, function(token) {
-                var value = token.match(/s/i) ? args[i].value : args[i].toCSS();
-                return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
-            });
-        }
-        result = result.replace(/%%/g, '%');
-        return new(tree.Quoted)(string.quote || '', result, string.escaped);
-    },
-    unit: function (val, unit) {
-        if(!(val instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "the first argument to unit must be a number" + (val instanceof tree.Operation ? ". Have you forgotten parenthesis?" : "") };
-        }
-        if (unit) {
-            if (unit instanceof tree.Keyword) {
-                unit = unit.value;
-            } else {
-                unit = unit.toCSS();
-            }
-        } else {
-            unit = "";
-        }
-        return new(tree.Dimension)(val.value, unit);
-    },
-    convert: function (val, unit) {
-        return val.convertTo(unit.value);
-    },
-    round: function (n, f) {
-        var fraction = typeof(f) === "undefined" ? 0 : f.value;
-        return _math(function(num) { return num.toFixed(fraction); }, null, n);
-    },
-    pi: function () {
-        return new(tree.Dimension)(Math.PI);
-    },
-    mod: function(a, b) {
-        return new(tree.Dimension)(a.value % b.value, a.unit);
-    },
-    pow: function(x, y) {
-        if (typeof x === "number" && typeof y === "number") {
-            x = new(tree.Dimension)(x);
-            y = new(tree.Dimension)(y);
-        } else if (!(x instanceof tree.Dimension) || !(y instanceof tree.Dimension)) {
-            throw { type: "Argument", message: "arguments must be numbers" };
-        }
-
-        return new(tree.Dimension)(Math.pow(x.value, y.value), x.unit);
-    },
-    _minmax: function (isMin, args) {
-        args = Array.prototype.slice.call(args);
-        switch(args.length) {
-            case 0: throw { type: "Argument", message: "one or more arguments required" };
-        }
-        var i, j, current, currentUnified, referenceUnified, unit, unitStatic, unitClone,
-            order  = [], // elems only contains original argument values.
-            values = {}; // key is the unit.toString() for unified tree.Dimension values,
-                         // value is the index into the order array.
-        for (i = 0; i < args.length; i++) {
-            current = args[i];
-            if (!(current instanceof tree.Dimension)) {
-                if(Array.isArray(args[i].value)) {
-                    Array.prototype.push.apply(args, Array.prototype.slice.call(args[i].value));
-                }
-                continue;
-            }
-            currentUnified = current.unit.toString() === "" && unitClone !== undefined ? new(tree.Dimension)(current.value, unitClone).unify() : current.unify();
-            unit = currentUnified.unit.toString() === "" && unitStatic !== undefined ? unitStatic : currentUnified.unit.toString();
-            unitStatic = unit !== "" && unitStatic === undefined || unit !== "" && order[0].unify().unit.toString() === "" ? unit : unitStatic;
-            unitClone = unit !== "" && unitClone === undefined ? current.unit.toString() : unitClone;
-            j = values[""] !== undefined && unit !== "" && unit === unitStatic ? values[""] : values[unit];
-            if (j === undefined) {
-                if(unitStatic !== undefined && unit !== unitStatic) {
-                    throw{ type: "Argument", message: "incompatible types" };
-                }
-                values[unit] = order.length;
-                order.push(current);
-                continue;
-            }
-            referenceUnified = order[j].unit.toString() === "" && unitClone !== undefined ? new(tree.Dimension)(order[j].value, unitClone).unify() : order[j].unify();
-            if ( isMin && currentUnified.value < referenceUnified.value ||
-                !isMin && currentUnified.value > referenceUnified.value) {
-                order[j] = current;
-            }
-        }
-        if (order.length == 1) {
-            return order[0];
-        }
-        args = order.map(function (a) { return a.toCSS(this.env); }).join(this.env.compress ? "," : ", ");
-        return new(tree.Anonymous)((isMin ? "min" : "max") + "(" + args + ")");
-    },
-    min: function () {
-        return this._minmax(true, arguments);
-    },
-    max: function () {
-        return this._minmax(false, arguments);
-    },
-    "get-unit": function (n) {
-        return new(tree.Anonymous)(n.unit);
-    },
-    argb: function (color) {
-        return new(tree.Anonymous)(color.toARGB());
-    },
-    percentage: function (n) {
-        return new(tree.Dimension)(n.value * 100, '%');
-    },
-    color: function (n) {
-        if (n instanceof tree.Quoted) {
-            var colorCandidate = n.value,
-                returnColor;
-            returnColor = tree.Color.fromKeyword(colorCandidate);
-            if (returnColor) {
-                return returnColor;
-            }
-            if (/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/.test(colorCandidate)) {
-                return new(tree.Color)(colorCandidate.slice(1));
-            }
-            throw { type: "Argument", message: "argument must be a color keyword or 3/6 digit hex e.g. #FFF" };
-        } else {
-            throw { type: "Argument", message: "argument must be a string" };
-        }
-    },
-    iscolor: function (n) {
-        return this._isa(n, tree.Color);
-    },
-    isnumber: function (n) {
-        return this._isa(n, tree.Dimension);
-    },
-    isstring: function (n) {
-        return this._isa(n, tree.Quoted);
-    },
-    iskeyword: function (n) {
-        return this._isa(n, tree.Keyword);
-    },
-    isurl: function (n) {
-        return this._isa(n, tree.URL);
-    },
-    ispixel: function (n) {
-        return this.isunit(n, 'px');
-    },
-    ispercentage: function (n) {
-        return this.isunit(n, '%');
-    },
-    isem: function (n) {
-        return this.isunit(n, 'em');
-    },
-    isunit: function (n, unit) {
-        return (n instanceof tree.Dimension) && n.unit.is(unit.value || unit) ? tree.True : tree.False;
-    },
-    _isa: function (n, Type) {
-        return (n instanceof Type) ? tree.True : tree.False;
-    },
-    tint: function(color, amount) {
-        return this.mix(this.rgb(255,255,255), color, amount);
-    },
-    shade: function(color, amount) {
-        return this.mix(this.rgb(0, 0, 0), color, amount);
-    },
-    extract: function(values, index) {
-        index = index.value - 1; // (1-based index)
-        // handle non-array values as an array of length 1
-        // return 'undefined' if index is invalid
-        return Array.isArray(values.value)
-            ? values.value[index] : Array(values)[index];
-    },
-    length: function(values) {
-        var n = Array.isArray(values.value) ? values.value.length : 1;
-        return new tree.Dimension(n);
-    },
-
-    "data-uri": function(mimetypeNode, filePathNode) {
-
-        if (typeof window !== 'undefined') {
-            return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-        }
-
-        var mimetype = mimetypeNode.value;
-        var filePath = (filePathNode && filePathNode.value);
-
-        var fs = require('./fs'),
-            path = require('path'),
-            useBase64 = false;
-
-        if (arguments.length < 2) {
-            filePath = mimetype;
-        }
-
-        var fragmentStart = filePath.indexOf('#');
-        var fragment = '';
-        if (fragmentStart!==-1) {
-            fragment = filePath.slice(fragmentStart);
-            filePath = filePath.slice(0, fragmentStart);
-        }
-
-        if (this.env.isPathRelative(filePath)) {
-            if (this.currentFileInfo.relativeUrls) {
-                filePath = path.join(this.currentFileInfo.currentDirectory, filePath);
-            } else {
-                filePath = path.join(this.currentFileInfo.entryPath, filePath);
-            }
-        }
-
-        // detect the mimetype if not given
-        if (arguments.length < 2) {
-            var mime;
-            try {
-                mime = require('mime');
-            } catch (ex) {
-                mime = tree._mime;
-            }
-
-            mimetype = mime.lookup(filePath);
-
-            // use base 64 unless it's an ASCII or UTF-8 format
-            var charset = mime.charsets.lookup(mimetype);
-            useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
-            if (useBase64) { mimetype += ';base64'; }
-        }
-        else {
-            useBase64 = /;base64$/.test(mimetype);
-        }
-
-        var buf = fs.readFileSync(filePath);
-
-        // IE8 cannot handle a data-uri larger than 32KB. If this is exceeded
-        // and the --ieCompat flag is enabled, return a normal url() instead.
-        var DATA_URI_MAX_KB = 32,
-            fileSizeInKB = parseInt((buf.length / 1024), 10);
-        if (fileSizeInKB >= DATA_URI_MAX_KB) {
-
-            if (this.env.ieCompat !== false) {
-                if (!this.env.silent) {
-                    console.warn("Skipped data-uri embedding of %s because its size (%dKB) exceeds IE8-safe %dKB!", filePath, fileSizeInKB, DATA_URI_MAX_KB);
-                }
-
-                return new tree.URL(filePathNode || mimetypeNode, this.currentFileInfo).eval(this.env);
-            }
-        }
-
-        buf = useBase64 ? buf.toString('base64')
-                        : encodeURIComponent(buf);
-
-        var uri = "\"data:" + mimetype + ',' + buf + fragment + "\"";
-        return new(tree.URL)(new(tree.Anonymous)(uri));
-    },
-
-    "svg-gradient": function(direction) {
-
-        function throwArgumentDescriptor() {
-            throw { type: "Argument", message: "svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position]" };
-        }
-
-        if (arguments.length < 3) {
-            throwArgumentDescriptor();
-        }
-        var stops = Array.prototype.slice.call(arguments, 1),
-            gradientDirectionSvg,
-            gradientType = "linear",
-            rectangleDimension = 'x="0" y="0" width="1" height="1"',
-            useBase64 = true,
-            renderEnv = {compress: false},
-            returner,
-            directionValue = direction.toCSS(renderEnv),
-            i, color, position, positionValue, alpha;
-
-        switch (directionValue) {
-            case "to bottom":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
-                break;
-            case "to right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
-                break;
-            case "to bottom right":
-                gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
-                break;
-            case "to top right":
-                gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
-                break;
-            case "ellipse":
-            case "ellipse at center":
-                gradientType = "radial";
-                gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
-                rectangleDimension = 'x="-50" y="-50" width="101" height="101"';
-                break;
-            default:
-                throw { type: "Argument", message: "svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" };
-        }
-        returner = '<?xml version="1.0" ?>' +
-            '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' +
-            '<' + gradientType + 'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' + gradientDirectionSvg + '>';
-
-        for (i = 0; i < stops.length; i+= 1) {
-            if (stops[i].value) {
-                color = stops[i].value[0];
-                position = stops[i].value[1];
-            } else {
-                color = stops[i];
-                position = undefined;
-            }
-
-            if (!(color instanceof tree.Color) || (!((i === 0 || i+1 === stops.length) && position === undefined) && !(position instanceof tree.Dimension))) {
-                throwArgumentDescriptor();
-            }
-            positionValue = position ? position.toCSS(renderEnv) : i === 0 ? "0%" : "100%";
-            alpha = color.alpha;
-            returner += '<stop offset="' + positionValue + '" stop-color="' + color.toRGB() + '"' + (alpha < 1 ? ' stop-opacity="' + alpha + '"' : '') + '/>';
-        }
-        returner += '</' + gradientType + 'Gradient>' +
-                    '<rect ' + rectangleDimension + ' fill="url(#gradient)" /></svg>';
-
-        if (useBase64) {
-            try {
-                returner = require('./encoder').encodeBase64(returner); // TODO browser implementation
-            } catch(e) {
-                useBase64 = false;
-            }
-        }
-
-        returner = "'data:image/svg+xml" + (useBase64 ? ";base64" : "") + "," + returner + "'";
-        return new(tree.URL)(new(tree.Anonymous)(returner));
-    }
-};
-
-// these static methods are used as a fallback when the optional 'mime' dependency is missing
-tree._mime = {
-    // this map is intentionally incomplete
-    // if you want more, install 'mime' dep
-    _types: {
-        '.htm' : 'text/html',
-        '.html': 'text/html',
-        '.gif' : 'image/gif',
-        '.jpg' : 'image/jpeg',
-        '.jpeg': 'image/jpeg',
-        '.png' : 'image/png'
-    },
-    lookup: function (filepath) {
-        var ext = require('path').extname(filepath),
-            type = tree._mime._types[ext];
-        if (type === undefined) {
-            throw new Error('Optional dependency "mime" is required for ' + ext);
-        }
-        return type;
-    },
-    charsets: {
-        lookup: function (type) {
-            // assumes all text types are UTF-8
-            return type && (/^text\//).test(type) ? 'UTF-8' : '';
-        }
-    }
-};
-
-// Math
-
-var mathFunctions = {
- // name,  unit
-    ceil:  null,
-    floor: null,
-    sqrt:  null,
-    abs:   null,
-    tan:   "",
-    sin:   "",
-    cos:   "",
-    atan:  "rad",
-    asin:  "rad",
-    acos:  "rad"
-};
-
-function _math(fn, unit, n) {
-    if (!(n instanceof tree.Dimension)) {
-        throw { type: "Argument", message: "argument must be a number" };
-    }
-    if (unit == null) {
-        unit = n.unit;
-    } else {
-        n = n.unify();
-    }
-    return new(tree.Dimension)(fn(parseFloat(n.value)), unit);
-}
-
-// ~ End of Math
-
-// Color Blending
-// ref: http://www.w3.org/TR/compositing-1
-
-function colorBlend(mode, color1, color2) {
-    var ab = color1.alpha, cb, // backdrop
-        as = color2.alpha, cs, // source
-        ar, cr, r = [];        // result
-
-    ar = as + ab * (1 - as);
-    for (var i = 0; i < 3; i++) {
-        cb = color1.rgb[i] / 255;
-        cs = color2.rgb[i] / 255;
-        cr = mode(cb, cs);
-        if (ar) {
-            cr = (as * cs + ab * (cb
-                - as * (cb + cs - cr))) / ar;
-        }
-        r[i] = cr * 255;
-    }
-
-    return new(tree.Color)(r, ar);
-}
-
-var colorBlendMode = {
-    multiply: function(cb, cs) {
-        return cb * cs;
-    },
-    screen: function(cb, cs) {
-        return cb + cs - cb * cs;
-    },
-    overlay: function(cb, cs) {
-        cb *= 2;
-        return (cb <= 1)
-            ? colorBlendMode.multiply(cb, cs)
-            : colorBlendMode.screen(cb - 1, cs);
-    },
-    softlight: function(cb, cs) {
-        var d = 1, e = cb;
-        if (cs > 0.5) {
-            e = 1;
-            d = (cb > 0.25) ? Math.sqrt(cb)
-                : ((16 * cb - 12) * cb + 4) * cb;
-        }
-        return cb - (1 - 2 * cs) * e * (d - cb);
-    },
-    hardlight: function(cb, cs) {
-        return colorBlendMode.overlay(cs, cb);
-    },
-    difference: function(cb, cs) {
-        return Math.abs(cb - cs);
-    },
-    exclusion: function(cb, cs) {
-        return cb + cs - 2 * cb * cs;
-    },
-
-    // non-w3c functions:
-    average: function(cb, cs) {
-        return (cb + cs) / 2;
-    },
-    negation: function(cb, cs) {
-        return 1 - Math.abs(cb + cs - 1);
-    }
-};
-
-// ~ End of Color Blending
-
-tree.defaultFunc = {
-    eval: function () {
-        var v = this.value_, e = this.error_;
-        if (e) {
-            throw e;
-        }
-        if (v != null) {
-            return v ? tree.True : tree.False;
-        }
-    },
-    value: function (v) {
-        this.value_ = v;
-    },
-    error: function (e) {
-        this.error_ = e;
-    },
-    reset: function () {
-        this.value_ = this.error_ = null;
-    }
-};
-
-function initFunctions() {
-    var f, tf = tree.functions;
-
-    // math
-    for (f in mathFunctions) {
-        if (mathFunctions.hasOwnProperty(f)) {
-            tf[f] = _math.bind(null, Math[f], mathFunctions[f]);
-        }
-    }
-
-    // color blending
-    for (f in colorBlendMode) {
-        if (colorBlendMode.hasOwnProperty(f)) {
-            tf[f] = colorBlend.bind(null, colorBlendMode[f]);
-        }
-    }
-
-    // default
-    f = tree.defaultFunc;
-    tf["default"] = f.eval.bind(f);
-
-} initFunctions();
-
-function hsla(color) {
-    return tree.functions.hsla(color.h, color.s, color.l, color.a);
-}
-
-function scaled(n, size) {
-    if (n instanceof tree.Dimension && n.unit.is('%')) {
-        return parseFloat(n.value * size / 100);
-    } else {
-        return number(n);
-    }
-}
-
-function number(n) {
-    if (n instanceof tree.Dimension) {
-        return parseFloat(n.unit.is('%') ? n.value / 100 : n.value);
-    } else if (typeof(n) === 'number') {
-        return n;
-    } else {
-        throw {
-            error: "RuntimeError",
-            message: "color functions take numbers as parameters"
-        };
-    }
-}
-
-function clamp(val) {
-    return Math.min(1, Math.max(0, val));
-}
-
-tree.fround = function(env, value) {
-    var p = env && env.numPrecision;
-    //add "epsilon" to ensure numbers like 1.000000005 (represented as 1.000000004999....) are properly rounded...
-    return (p == null) ? value : Number((value + 2e-16).toFixed(p));
-};
-
-tree.functionCall = function(env, currentFileInfo) {
-    this.env = env;
-    this.currentFileInfo = currentFileInfo;
-};
-
-tree.functionCall.prototype = tree.functions;
-
-})(require('./tree'));
-
-(function (tree) {
-    tree.colors = {
-        'aliceblue':'#f0f8ff',
-        'antiquewhite':'#faebd7',
-        'aqua':'#00ffff',
-        'aquamarine':'#7fffd4',
-        'azure':'#f0ffff',
-        'beige':'#f5f5dc',
-        'bisque':'#ffe4c4',
-        'black':'#000000',
-        'blanchedalmond':'#ffebcd',
-        'blue':'#0000ff',
-        'blueviolet':'#8a2be2',
-        'brown':'#a52a2a',
-        'burlywood':'#deb887',
-        'cadetblue':'#5f9ea0',
-        'chartreuse':'#7fff00',
-        'chocolate':'#d2691e',
-        'coral':'#ff7f50',
-        'cornflowerblue':'#6495ed',
-        'cornsilk':'#fff8dc',
-        'crimson':'#dc143c',
-        'cyan':'#00ffff',
-        'darkblue':'#00008b',
-        'darkcyan':'#008b8b',
-        'darkgoldenrod':'#b8860b',
-        'darkgray':'#a9a9a9',
-        'darkgrey':'#a9a9a9',
-        'darkgreen':'#006400',
-        'darkkhaki':'#bdb76b',
-        'darkmagenta':'#8b008b',
-        'darkolivegreen':'#556b2f',
-        'darkorange':'#ff8c00',
-        'darkorchid':'#9932cc',
-        'darkred':'#8b0000',
-        'darksalmon':'#e9967a',
-        'darkseagreen':'#8fbc8f',
-        'darkslateblue':'#483d8b',
-        'darkslategray':'#2f4f4f',
-        'darkslategrey':'#2f4f4f',
-        'darkturquoise':'#00ced1',
-        'darkviolet':'#9400d3',
-        'deeppink':'#ff1493',
-        'deepskyblue':'#00bfff',
-        'dimgray':'#696969',
-        'dimgrey':'#696969',
-        'dodgerblue':'#1e90ff',
-        'firebrick':'#b22222',
-        'floralwhite':'#fffaf0',
-        'forestgreen':'#228b22',
-        'fuchsia':'#ff00ff',
-        'gainsboro':'#dcdcdc',
-        'ghostwhite':'#f8f8ff',
-        'gold':'#ffd700',
-        'goldenrod':'#daa520',
-        'gray':'#808080',
-        'grey':'#808080',
-        'green':'#008000',
-        'greenyellow':'#adff2f',
-        'honeydew':'#f0fff0',
-        'hotpink':'#ff69b4',
-        'indianred':'#cd5c5c',
-        'indigo':'#4b0082',
-        'ivory':'#fffff0',
-        'khaki':'#f0e68c',
-        'lavender':'#e6e6fa',
-        'lavenderblush':'#fff0f5',
-        'lawngreen':'#7cfc00',
-        'lemonchiffon':'#fffacd',
-        'lightblue':'#add8e6',
-        'lightcoral':'#f08080',
-        'lightcyan':'#e0ffff',
-        'lightgoldenrodyellow':'#fafad2',
-        'lightgray':'#d3d3d3',
-        'lightgrey':'#d3d3d3',
-        'lightgreen':'#90ee90',
-        'lightpink':'#ffb6c1',
-        'lightsalmon':'#ffa07a',
-        'lightseagreen':'#20b2aa',
-        'lightskyblue':'#87cefa',
-        'lightslategray':'#778899',
-        'lightslategrey':'#778899',
-        'lightsteelblue':'#b0c4de',
-        'lightyellow':'#ffffe0',
-        'lime':'#00ff00',
-        'limegreen':'#32cd32',
-        'linen':'#faf0e6',
-        'magenta':'#ff00ff',
-        'maroon':'#800000',
-        'mediumaquamarine':'#66cdaa',
-        'mediumblue':'#0000cd',
-        'mediumorchid':'#ba55d3',
-        'mediumpurple':'#9370d8',
-        'mediumseagreen':'#3cb371',
-        'mediumslateblue':'#7b68ee',
-        'mediumspringgreen':'#00fa9a',
-        'mediumturquoise':'#48d1cc',
-        'mediumvioletred':'#c71585',
-        'midnightblue':'#191970',
-        'mintcream':'#f5fffa',
-        'mistyrose':'#ffe4e1',
-        'moccasin':'#ffe4b5',
-        'navajowhite':'#ffdead',
-        'navy':'#000080',
-        'oldlace':'#fdf5e6',
-        'olive':'#808000',
-        'olivedrab':'#6b8e23',
-        'orange':'#ffa500',
-        'orangered':'#ff4500',
-        'orchid':'#da70d6',
-        'palegoldenrod':'#eee8aa',
-        'palegreen':'#98fb98',
-        'paleturquoise':'#afeeee',
-        'palevioletred':'#d87093',
-        'papayawhip':'#ffefd5',
-        'peachpuff':'#ffdab9',
-        'peru':'#cd853f',
-        'pink':'#ffc0cb',
-        'plum':'#dda0dd',
-        'powderblue':'#b0e0e6',
-        'purple':'#800080',
-        'red':'#ff0000',
-        'rosybrown':'#bc8f8f',
-        'royalblue':'#4169e1',
-        'saddlebrown':'#8b4513',
-        'salmon':'#fa8072',
-        'sandybrown':'#f4a460',
-        'seagreen':'#2e8b57',
-        'seashell':'#fff5ee',
-        'sienna':'#a0522d',
-        'silver':'#c0c0c0',
-        'skyblue':'#87ceeb',
-        'slateblue':'#6a5acd',
-        'slategray':'#708090',
-        'slategrey':'#708090',
-        'snow':'#fffafa',
-        'springgreen':'#00ff7f',
-        'steelblue':'#4682b4',
-        'tan':'#d2b48c',
-        'teal':'#008080',
-        'thistle':'#d8bfd8',
-        'tomato':'#ff6347',
-        'turquoise':'#40e0d0',
-        'violet':'#ee82ee',
-        'wheat':'#f5deb3',
-        'white':'#ffffff',
-        'whitesmoke':'#f5f5f5',
-        'yellow':'#ffff00',
-        'yellowgreen':'#9acd32'
-    };
-})(require('./tree'));
-
-(function (tree) {
-
-tree.debugInfo = function(env, ctx, lineSeperator) {
-    var result="";
-    if (env.dumpLineNumbers && !env.compress) {
-        switch(env.dumpLineNumbers) {
-            case 'comments':
-                result = tree.debugInfo.asComment(ctx);
-                break;
-            case 'mediaquery':
-                result = tree.debugInfo.asMediaQuery(ctx);
-                break;
-            case 'all':
-                result = tree.debugInfo.asComment(ctx) + (lineSeperator || "") + tree.debugInfo.asMediaQuery(ctx);
-                break;
-        }
-    }
-    return result;
-};
-
-tree.debugInfo.asComment = function(ctx) {
-    return '/* line ' + ctx.debugInfo.lineNumber + ', ' + ctx.debugInfo.fileName + ' */\n';
-};
-
-tree.debugInfo.asMediaQuery = function(ctx) {
-    return '@media -sass-debug-info{filename{font-family:' +
-        ('file://' + ctx.debugInfo.fileName).replace(/([.:\/\\])/g, function (a) {
-            if (a == '\\') {
-                a = '\/';
-            }
-            return '\\' + a;
-        }) +
-        '}line{font-family:\\00003' + ctx.debugInfo.lineNumber + '}}\n';
-};
-
-tree.find = function (obj, fun) {
-    for (var i = 0, r; i < obj.length; i++) {
-        r = fun.call(obj, obj[i]);
-        if (r) { return r; }
-    }
-    return null;
-};
-
-tree.jsify = function (obj) {
-    if (Array.isArray(obj.value) && (obj.value.length > 1)) {
-        return '[' + obj.value.map(function (v) { return v.toCSS(); }).join(', ') + ']';
-    } else {
-        return obj.toCSS();
-    }
-};
-
-tree.toCSS = function (env) {
-    var strs = [];
-    this.genCSS(env, {
-        add: function(chunk, fileInfo, index) {
-            strs.push(chunk);
-        },
-        isEmpty: function () {
-            return strs.length === 0;
-        }
-    });
-    return strs.join('');
-};
-
-tree.outputRuleset = function (env, output, rules) {
-    var ruleCnt = rules.length, i;
-    env.tabLevel = (env.tabLevel | 0) + 1;
-
-    // Compressed
-    if (env.compress) {
-        output.add('{');
-        for (i = 0; i < ruleCnt; i++) {
-            rules[i].genCSS(env, output);
-        }
-        output.add('}');
-        env.tabLevel--;
-        return;
-    }
-
-    // Non-compressed
-    var tabSetStr = '\n' + Array(env.tabLevel).join("  "), tabRuleStr = tabSetStr + "  ";
-    if (!ruleCnt) {
-        output.add(" {" + tabSetStr + '}');
-    } else {
-        output.add(" {" + tabRuleStr);
-        rules[0].genCSS(env, output);
-        for (i = 1; i < ruleCnt; i++) {
-            output.add(tabRuleStr);
-            rules[i].genCSS(env, output);
-        }
-        output.add(tabSetStr + '}');
-    }
-
-    env.tabLevel--;
-};
-
-})(require('./tree'));
-
-(function (tree) {
-
-tree.Alpha = function (val) {
-    this.value = val;
-};
-tree.Alpha.prototype = {
-    type: "Alpha",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) { return new tree.Alpha(this.value.eval(env)); }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add("alpha(opacity=");
-
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-
-        output.add(")");
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Anonymous = function (value, index, currentFileInfo, mapLines, rulesetLike) {
-    this.value = value;
-    this.index = index;
-    this.mapLines = mapLines;
-    this.currentFileInfo = currentFileInfo;
-    this.rulesetLike = (typeof rulesetLike === 'undefined')? false : rulesetLike;
-};
-tree.Anonymous.prototype = {
-    type: "Anonymous",
-    eval: function () {
-        return new tree.Anonymous(this.value, this.index, this.currentFileInfo, this.mapLines, this.rulesetLike);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left = this.toCSS(),
-            right = x.toCSS();
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    },
-    isRulesetLike: function() {
-        return this.rulesetLike;
-    },
-    genCSS: function (env, output) {
-        output.add(this.value, this.currentFileInfo, this.index, this.mapLines);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Assignment = function (key, val) {
-    this.key = key;
-    this.value = val;
-};
-tree.Assignment.prototype = {
-    type: "Assignment",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    eval: function (env) {
-        if (this.value.eval) {
-            return new(tree.Assignment)(this.key, this.value.eval(env));
-        }
-        return this;
-    },
-    genCSS: function (env, output) {
-        output.add(this.key + '=');
-        if (this.value.genCSS) {
-            this.value.genCSS(env, output);
-        } else {
-            output.add(this.value);
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A function call node.
-//
-tree.Call = function (name, args, index, currentFileInfo) {
-    this.name = name;
-    this.args = args;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Call.prototype = {
-    type: "Call",
-    accept: function (visitor) {
-        if (this.args) {
-            this.args = visitor.visitArray(this.args);
-        }
-    },
-    //
-    // When evaluating a function call,
-    // we either find the function in `tree.functions` [1],
-    // in which case we call it, passing the  evaluated arguments,
-    // if this returns null or we cannot find the function, we
-    // simply print it out as it appeared originally [2].
-    //
-    // The *functions.js* file contains the built-in functions.
-    //
-    // The reason why we evaluate the arguments, is in the case where
-    // we try to pass a variable to a function, like: `saturate(@color)`.
-    // The function should receive the value, not the variable.
-    //
-    eval: function (env) {
-        var args = this.args.map(function (a) { return a.eval(env); }),
-            nameLC = this.name.toLowerCase(),
-            result, func;
-
-        if (nameLC in tree.functions) { // 1.
-            try {
-                func = new tree.functionCall(env, this.currentFileInfo);
-                result = func[nameLC].apply(func, args);
-                if (result != null) {
-                    return result;
-                }
-            } catch (e) {
-                throw { type: e.type || "Runtime",
-                        message: "error evaluating function `" + this.name + "`" +
-                                 (e.message ? ': ' + e.message : ''),
-                        index: this.index, filename: this.currentFileInfo.filename };
-            }
-        }
-
-        return new tree.Call(this.name, args, this.index, this.currentFileInfo);
-    },
-
-    genCSS: function (env, output) {
-        output.add(this.name + "(", this.currentFileInfo, this.index);
-
-        for(var i = 0; i < this.args.length; i++) {
-            this.args[i].genCSS(env, output);
-            if (i + 1 < this.args.length) {
-                output.add(", ");
-            }
-        }
-
-        output.add(")");
-    },
-
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// RGB Colors - #ff0014, #eee
-//
-tree.Color = function (rgb, a) {
-    //
-    // The end goal here, is to parse the arguments
-    // into an integer triplet, such as `128, 255, 0`
-    //
-    // This facilitates operations and conversions.
-    //
-    if (Array.isArray(rgb)) {
-        this.rgb = rgb;
-    } else if (rgb.length == 6) {
-        this.rgb = rgb.match(/.{2}/g).map(function (c) {
-            return parseInt(c, 16);
-        });
-    } else {
-        this.rgb = rgb.split('').map(function (c) {
-            return parseInt(c + c, 16);
-        });
-    }
-    this.alpha = typeof(a) === 'number' ? a : 1;
-};
-
-var transparentKeyword = "transparent";
-
-tree.Color.prototype = {
-    type: "Color",
-    eval: function () { return this; },
-    luma: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255;
-
-        r = (r <= 0.03928) ? r / 12.92 : Math.pow(((r + 0.055) / 1.055), 2.4);
-        g = (g <= 0.03928) ? g / 12.92 : Math.pow(((g + 0.055) / 1.055), 2.4);
-        b = (b <= 0.03928) ? b / 12.92 : Math.pow(((b + 0.055) / 1.055), 2.4);
-
-        return 0.2126 * r + 0.7152 * g + 0.0722 * b;
-    },
-
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env, doNotCompress) {
-        var compress = env && env.compress && !doNotCompress,
-            alpha = tree.fround(env, this.alpha);
-
-        // If we have some transparency, the only way to represent it
-        // is via `rgba`. Otherwise, we use the hex representation,
-        // which has better compatibility with older browsers.
-        // Values are capped between `0` and `255`, rounded and zero-padded.
-        if (alpha < 1) {
-            if (alpha === 0 && this.isTransparentKeyword) {
-                return transparentKeyword;
-            }
-            return "rgba(" + this.rgb.map(function (c) {
-                return clamp(Math.round(c), 255);
-            }).concat(clamp(alpha, 1))
-                .join(',' + (compress ? '' : ' ')) + ")";
-        } else {
-            var color = this.toRGB();
-
-            if (compress) {
-                var splitcolor = color.split('');
-
-                // Convert color to short format
-                if (splitcolor[1] === splitcolor[2] && splitcolor[3] === splitcolor[4] && splitcolor[5] === splitcolor[6]) {
-                    color = '#' + splitcolor[1] + splitcolor[3] + splitcolor[5];
-                }
-            }
-
-            return color;
-        }
-    },
-
-    //
-    // Operations have to be done per-channel, if not,
-    // channels will spill onto each other. Once we have
-    // our result, in the form of an integer triplet,
-    // we create a new Color node to hold the result.
-    //
-    operate: function (env, op, other) {
-        var rgb = [];
-        var alpha = this.alpha * (1 - other.alpha) + other.alpha;
-        for (var c = 0; c < 3; c++) {
-            rgb[c] = tree.operate(env, op, this.rgb[c], other.rgb[c]);
-        }
-        return new(tree.Color)(rgb, alpha);
-    },
-
-    toRGB: function () {
-        return toHex(this.rgb);
-    },
-
-    toHSL: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, l = (max + min) / 2, d = max - min;
-
-        if (max === min) {
-            h = s = 0;
-        } else {
-            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
-
-            switch (max) {
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2;               break;
-                case b: h = (r - g) / d + 4;               break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, l: l, a: a };
-    },
-    //Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
-    toHSV: function () {
-        var r = this.rgb[0] / 255,
-            g = this.rgb[1] / 255,
-            b = this.rgb[2] / 255,
-            a = this.alpha;
-
-        var max = Math.max(r, g, b), min = Math.min(r, g, b);
-        var h, s, v = max;
-
-        var d = max - min;
-        if (max === 0) {
-            s = 0;
-        } else {
-            s = d / max;
-        }
-
-        if (max === min) {
-            h = 0;
-        } else {
-            switch(max){
-                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
-                case g: h = (b - r) / d + 2; break;
-                case b: h = (r - g) / d + 4; break;
-            }
-            h /= 6;
-        }
-        return { h: h * 360, s: s, v: v, a: a };
-    },
-    toARGB: function () {
-        return toHex([this.alpha * 255].concat(this.rgb));
-    },
-    compare: function (x) {
-        if (!x.rgb) {
-            return -1;
-        }
-
-        return (x.rgb[0] === this.rgb[0] &&
-            x.rgb[1] === this.rgb[1] &&
-            x.rgb[2] === this.rgb[2] &&
-            x.alpha === this.alpha) ? 0 : -1;
-    }
-};
-
-tree.Color.fromKeyword = function(keyword) {
-    keyword = keyword.toLowerCase();
-
-    if (tree.colors.hasOwnProperty(keyword)) {
-        // detect named color
-        return new(tree.Color)(tree.colors[keyword].slice(1));
-    }
-    if (keyword === transparentKeyword) {
-        var transparent = new(tree.Color)([0, 0, 0], 0);
-        transparent.isTransparentKeyword = true;
-        return transparent;
-    }
-};
-
-function toHex(v) {
-    return '#' + v.map(function (c) {
-        c = clamp(Math.round(c), 255);
-        return (c < 16 ? '0' : '') + c.toString(16);
-    }).join('');
-}
-
-function clamp(v, max) {
-    return Math.min(Math.max(v, 0), max);
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Comment = function (value, silent, index, currentFileInfo) {
-    this.value = value;
-    this.silent = !!silent;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Comment.prototype = {
-    type: "Comment",
-    genCSS: function (env, output) {
-        if (this.debugInfo) {
-            output.add(tree.debugInfo(env, this), this.currentFileInfo, this.index);
-        }
-        output.add(this.value.trim()); //TODO shouldn't need to trim, we shouldn't grab the \n
-    },
-    toCSS: tree.toCSS,
-    isSilent: function(env) {
-        var isReference = (this.currentFileInfo && this.currentFileInfo.reference && !this.isReferenced),
-            isCompressed = env.compress && !this.value.match(/^\/\*!/);
-        return this.silent || isReference || isCompressed;
-    },
-    eval: function () { return this; },
-    markReferenced: function () {
-        this.isReferenced = true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Condition = function (op, l, r, i, negate) {
-    this.op = op.trim();
-    this.lvalue = l;
-    this.rvalue = r;
-    this.index = i;
-    this.negate = negate;
-};
-tree.Condition.prototype = {
-    type: "Condition",
-    accept: function (visitor) {
-        this.lvalue = visitor.visit(this.lvalue);
-        this.rvalue = visitor.visit(this.rvalue);
-    },
-    eval: function (env) {
-        var a = this.lvalue.eval(env),
-            b = this.rvalue.eval(env);
-
-        var i = this.index, result;
-
-        result = (function (op) {
-            switch (op) {
-                case 'and':
-                    return a && b;
-                case 'or':
-                    return a || b;
-                default:
-                    if (a.compare) {
-                        result = a.compare(b);
-                    } else if (b.compare) {
-                        result = b.compare(a);
-                    } else {
-                        throw { type: "Type",
-                                message: "Unable to perform comparison",
-                                index: i };
-                    }
-                    switch (result) {
-                        case -1: return op === '<' || op === '=<' || op === '<=';
-                        case  0: return op === '=' || op === '>=' || op === '=<' || op === '<=';
-                        case  1: return op === '>' || op === '>=';
-                    }
-            }
-        })(this.op);
-        return this.negate ? !result : result;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.DetachedRuleset = function (ruleset, frames) {
-    this.ruleset = ruleset;
-    this.frames = frames;
-};
-tree.DetachedRuleset.prototype = {
-    type: "DetachedRuleset",
-    accept: function (visitor) {
-        this.ruleset = visitor.visit(this.ruleset);
-    },
-    eval: function (env) {
-        var frames = this.frames || env.frames.slice(0);
-        return new tree.DetachedRuleset(this.ruleset, frames);
-    },
-    callEval: function (env) {
-        return this.ruleset.eval(this.frames ? new(tree.evalEnv)(env, this.frames.concat(env.frames)) : env);
-    }
-};
-})(require('../tree'));
-
-(function (tree) {
-
-//
-// A number with a unit
-//
-tree.Dimension = function (value, unit) {
-    this.value = parseFloat(value);
-    this.unit = (unit && unit instanceof tree.Unit) ? unit :
-      new(tree.Unit)(unit ? [unit] : undefined);
-};
-
-tree.Dimension.prototype = {
-    type: "Dimension",
-    accept: function (visitor) {
-        this.unit = visitor.visit(this.unit);
-    },
-    eval: function (env) {
-        return this;
-    },
-    toColor: function () {
-        return new(tree.Color)([this.value, this.value, this.value]);
-    },
-    genCSS: function (env, output) {
-        if ((env && env.strictUnits) && !this.unit.isSingular()) {
-            throw new Error("Multiple units in dimension. Correct the units or use the unit function. Bad unit: "+this.unit.toString());
-        }
-
-        var value = tree.fround(env, this.value),
-            strValue = String(value);
-
-        if (value !== 0 && value < 0.000001 && value > -0.000001) {
-            // would be output 1e-6 etc.
-            strValue = value.toFixed(20).replace(/0+$/, "");
-        }
-
-        if (env && env.compress) {
-            // Zero values doesn't need a unit
-            if (value === 0 && this.unit.isLength()) {
-                output.add(strValue);
-                return;
-            }
-
-            // Float values doesn't need a leading zero
-            if (value > 0 && value < 1) {
-                strValue = (strValue).substr(1);
-            }
-        }
-
-        output.add(strValue);
-        this.unit.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-
-    // In an operation between two Dimensions,
-    // we default to the first Dimension's unit,
-    // so `1px + 2` will yield `3px`.
-    operate: function (env, op, other) {
-        /*jshint noempty:false */
-        var value = tree.operate(env, op, this.value, other.value),
-            unit = this.unit.clone();
-
-        if (op === '+' || op === '-') {
-            if (unit.numerator.length === 0 && unit.denominator.length === 0) {
-                unit.numerator = other.unit.numerator.slice(0);
-                unit.denominator = other.unit.denominator.slice(0);
-            } else if (other.unit.numerator.length === 0 && unit.denominator.length === 0) {
-                // do nothing
-            } else {
-                other = other.convertTo(this.unit.usedUnits());
-
-                if(env.strictUnits && other.unit.toString() !== unit.toString()) {
-                  throw new Error("Incompatible units. Change the units or use the unit function. Bad units: '" + unit.toString() +
-                    "' and '" + other.unit.toString() + "'.");
-                }
-
-                value = tree.operate(env, op, this.value, other.value);
-            }
-        } else if (op === '*') {
-            unit.numerator = unit.numerator.concat(other.unit.numerator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.denominator).sort();
-            unit.cancel();
-        } else if (op === '/') {
-            unit.numerator = unit.numerator.concat(other.unit.denominator).sort();
-            unit.denominator = unit.denominator.concat(other.unit.numerator).sort();
-            unit.cancel();
-        }
-        return new(tree.Dimension)(value, unit);
-    },
-
-    compare: function (other) {
-        if (other instanceof tree.Dimension) {
-            var a, b,
-                aValue, bValue;
-
-            if (this.unit.isEmpty() || other.unit.isEmpty()) {
-                a = this;
-                b = other;
-            } else {
-                a = this.unify();
-                b = other.unify();
-                if (a.unit.compare(b.unit) !== 0) {
-                    return -1;
-                }
-            }
-            aValue = a.value;
-            bValue = b.value;
-
-            if (bValue > aValue) {
-                return -1;
-            } else if (bValue < aValue) {
-                return 1;
-            } else {
-                return 0;
-            }
-        } else {
-            return -1;
-        }
-    },
-
-    unify: function () {
-        return this.convertTo({ length: 'px', duration: 's', angle: 'rad' });
-    },
-
-    convertTo: function (conversions) {
-        var value = this.value, unit = this.unit.clone(),
-            i, groupName, group, targetUnit, derivedConversions = {}, applyUnit;
-
-        if (typeof conversions === 'string') {
-            for(i in tree.UnitConversions) {
-                if (tree.UnitConversions[i].hasOwnProperty(conversions)) {
-                    derivedConversions = {};
-                    derivedConversions[i] = conversions;
-                }
-            }
-            conversions = derivedConversions;
-        }
-        applyUnit = function (atomicUnit, denominator) {
-          /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit)) {
-                if (denominator) {
-                    value = value / (group[atomicUnit] / group[targetUnit]);
-                } else {
-                    value = value * (group[atomicUnit] / group[targetUnit]);
-                }
-
-                return targetUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (groupName in conversions) {
-            if (conversions.hasOwnProperty(groupName)) {
-                targetUnit = conversions[groupName];
-                group = tree.UnitConversions[groupName];
-
-                unit.map(applyUnit);
-            }
-        }
-
-        unit.cancel();
-
-        return new(tree.Dimension)(value, unit);
-    }
-};
-
-// http://www.w3.org/TR/css3-values/#absolute-lengths
-tree.UnitConversions = {
-    length: {
-         'm': 1,
-        'cm': 0.01,
-        'mm': 0.001,
-        'in': 0.0254,
-        'px': 0.0254 / 96,
-        'pt': 0.0254 / 72,
-        'pc': 0.0254 / 72 * 12
-    },
-    duration: {
-        's': 1,
-        'ms': 0.001
-    },
-    angle: {
-        'rad': 1/(2*Math.PI),
-        'deg': 1/360,
-        'grad': 1/400,
-        'turn': 1
-    }
-};
-
-tree.Unit = function (numerator, denominator, backupUnit) {
-    this.numerator = numerator ? numerator.slice(0).sort() : [];
-    this.denominator = denominator ? denominator.slice(0).sort() : [];
-    this.backupUnit = backupUnit;
-};
-
-tree.Unit.prototype = {
-    type: "Unit",
-    clone: function () {
-        return new tree.Unit(this.numerator.slice(0), this.denominator.slice(0), this.backupUnit);
-    },
-    genCSS: function (env, output) {
-        if (this.numerator.length >= 1) {
-            output.add(this.numerator[0]);
-        } else
-        if (this.denominator.length >= 1) {
-            output.add(this.denominator[0]);
-        } else
-        if ((!env || !env.strictUnits) && this.backupUnit) {
-            output.add(this.backupUnit);
-        }
-    },
-    toCSS: tree.toCSS,
-
-    toString: function () {
-      var i, returnStr = this.numerator.join("*");
-      for (i = 0; i < this.denominator.length; i++) {
-          returnStr += "/" + this.denominator[i];
-      }
-      return returnStr;
-    },
-
-    compare: function (other) {
-        return this.is(other.toString()) ? 0 : -1;
-    },
-
-    is: function (unitString) {
-        return this.toString() === unitString;
-    },
-
-    isLength: function () {
-        return Boolean(this.toCSS().match(/px|em|%|in|cm|mm|pc|pt|ex/));
-    },
-
-    isEmpty: function () {
-        return this.numerator.length === 0 && this.denominator.length === 0;
-    },
-
-    isSingular: function() {
-        return this.numerator.length <= 1 && this.denominator.length === 0;
-    },
-
-    map: function(callback) {
-        var i;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            this.numerator[i] = callback(this.numerator[i], false);
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            this.denominator[i] = callback(this.denominator[i], true);
-        }
-    },
-
-    usedUnits: function() {
-        var group, result = {}, mapUnit;
-
-        mapUnit = function (atomicUnit) {
-        /*jshint loopfunc:true */
-            if (group.hasOwnProperty(atomicUnit) && !result[groupName]) {
-                result[groupName] = atomicUnit;
-            }
-
-            return atomicUnit;
-        };
-
-        for (var groupName in tree.UnitConversions) {
-            if (tree.UnitConversions.hasOwnProperty(groupName)) {
-                group = tree.UnitConversions[groupName];
-
-                this.map(mapUnit);
-            }
-        }
-
-        return result;
-    },
-
-    cancel: function () {
-        var counter = {}, atomicUnit, i, backup;
-
-        for (i = 0; i < this.numerator.length; i++) {
-            atomicUnit = this.numerator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) + 1;
-        }
-
-        for (i = 0; i < this.denominator.length; i++) {
-            atomicUnit = this.denominator[i];
-            if (!backup) {
-                backup = atomicUnit;
-            }
-            counter[atomicUnit] = (counter[atomicUnit] || 0) - 1;
-        }
-
-        this.numerator = [];
-        this.denominator = [];
-
-        for (atomicUnit in counter) {
-            if (counter.hasOwnProperty(atomicUnit)) {
-                var count = counter[atomicUnit];
-
-                if (count > 0) {
-                    for (i = 0; i < count; i++) {
-                        this.numerator.push(atomicUnit);
-                    }
-                } else if (count < 0) {
-                    for (i = 0; i < -count; i++) {
-                        this.denominator.push(atomicUnit);
-                    }
-                }
-            }
-        }
-
-        if (this.numerator.length === 0 && this.denominator.length === 0 && backup) {
-            this.backupUnit = backup;
-        }
-
-        this.numerator.sort();
-        this.denominator.sort();
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Directive = function (name, value, rules, index, currentFileInfo, debugInfo) {
-    this.name  = name;
-    this.value = value;
-    if (rules) {
-        this.rules = rules;
-        this.rules.allowImports = true;
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.debugInfo = debugInfo;
-};
-
-tree.Directive.prototype = {
-    type: "Directive",
-    accept: function (visitor) {
-        var value = this.value, rules = this.rules;
-        if (rules) {
-            rules = visitor.visit(rules);
-        }
-        if (value) {
-            value = visitor.visit(value);
-        }
-    },
-    isRulesetLike: function() {
-        return !this.isCharset();
-    },
-    isCharset: function() {
-        return "@charset" === this.name;
-    },
-    genCSS: function (env, output) {
-        var value = this.value, rules = this.rules;
-        output.add(this.name, this.currentFileInfo, this.index);
-        if (value) {
-            output.add(' ');
-            value.genCSS(env, output);
-        }
-        if (rules) {
-            tree.outputRuleset(env, output, [rules]);
-        } else {
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var value = this.value, rules = this.rules;
-        if (value) {
-            value = value.eval(env);
-        }
-        if (rules) {
-            rules = rules.eval(env);
-            rules.root = true;
-        }
-        return new(tree.Directive)(this.name, value, rules,
-            this.index, this.currentFileInfo, this.debugInfo);
-    },
-    variable: function (name) { if (this.rules) return tree.Ruleset.prototype.variable.call(this.rules, name); },
-    find: function () { if (this.rules) return tree.Ruleset.prototype.find.apply(this.rules, arguments); },
-    rulesets: function () { if (this.rules) return tree.Ruleset.prototype.rulesets.apply(this.rules); },
-    markReferenced: function () {
-        var i, rules;
-        this.isReferenced = true;
-        if (this.rules) {
-            rules = this.rules.rules;
-            for (i = 0; i < rules.length; i++) {
-                if (rules[i].markReferenced) {
-                    rules[i].markReferenced();
-                }
-            }
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Element = function (combinator, value, index, currentFileInfo) {
-    this.combinator = combinator instanceof tree.Combinator ?
-                      combinator : new(tree.Combinator)(combinator);
-
-    if (typeof(value) === 'string') {
-        this.value = value.trim();
-    } else if (value) {
-        this.value = value;
-    } else {
-        this.value = "";
-    }
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Element.prototype = {
-    type: "Element",
-    accept: function (visitor) {
-        var value = this.value;
-        this.combinator = visitor.visit(this.combinator);
-        if (typeof value === "object") {
-            this.value = visitor.visit(value);
-        }
-    },
-    eval: function (env) {
-        return new(tree.Element)(this.combinator,
-                                 this.value.eval ? this.value.eval(env) : this.value,
-                                 this.index,
-                                 this.currentFileInfo);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env), this.currentFileInfo, this.index);
-    },
-    toCSS: function (env) {
-        var value = (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        if (value === '' && this.combinator.value.charAt(0) === '&') {
-            return '';
-        } else {
-            return this.combinator.toCSS(env || {}) + value;
-        }
-    }
-};
-
-tree.Attribute = function (key, op, value) {
-    this.key = key;
-    this.op = op;
-    this.value = value;
-};
-tree.Attribute.prototype = {
-    type: "Attribute",
-    eval: function (env) {
-        return new(tree.Attribute)(this.key.eval ? this.key.eval(env) : this.key,
-            this.op, (this.value && this.value.eval) ? this.value.eval(env) : this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.toCSS(env));
-    },
-    toCSS: function (env) {
-        var value = this.key.toCSS ? this.key.toCSS(env) : this.key;
-
-        if (this.op) {
-            value += this.op;
-            value += (this.value.toCSS ? this.value.toCSS(env) : this.value);
-        }
-
-        return '[' + value + ']';
-    }
-};
-
-tree.Combinator = function (value) {
-    if (value === ' ') {
-        this.value = ' ';
-    } else {
-        this.value = value ? value.trim() : "";
-    }
-};
-tree.Combinator.prototype = {
-    type: "Combinator",
-    _noSpaceCombinators: {
-        '': true,
-        ' ': true,
-        '|': true
-    },
-    genCSS: function (env, output) {
-        var spaceOrEmpty = (env.compress || this._noSpaceCombinators[this.value]) ? '' : ' ';
-        output.add(spaceOrEmpty + this.value + spaceOrEmpty);
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Expression = function (value) { this.value = value; };
-tree.Expression.prototype = {
-    type: "Expression",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        var returnValue,
-            inParenthesis = this.parens && !this.parensInOp,
-            doubleParen = false;
-        if (inParenthesis) {
-            env.inParenthesis();
-        }
-        if (this.value.length > 1) {
-            returnValue = new(tree.Expression)(this.value.map(function (e) {
-                return e.eval(env);
-            }));
-        } else if (this.value.length === 1) {
-            if (this.value[0].parens && !this.value[0].parensInOp) {
-                doubleParen = true;
-            }
-            returnValue = this.value[0].eval(env);
-        } else {
-            returnValue = this;
-        }
-        if (inParenthesis) {
-            env.outOfParenthesis();
-        }
-        if (this.parens && this.parensInOp && !(env.isMathOn()) && !doubleParen) {
-            returnValue = new(tree.Paren)(returnValue);
-        }
-        return returnValue;
-    },
-    genCSS: function (env, output) {
-        for(var i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i + 1 < this.value.length) {
-                output.add(" ");
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    throwAwayComments: function () {
-        this.value = this.value.filter(function(v) {
-            return !(v instanceof tree.Comment);
-        });
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Extend = function Extend(selector, option, index) {
-    this.selector = selector;
-    this.option = option;
-    this.index = index;
-    this.object_id = tree.Extend.next_id++;
-    this.parent_ids = [this.object_id];
-
-    switch(option) {
-        case "all":
-            this.allowBefore = true;
-            this.allowAfter = true;
-        break;
-        default:
-            this.allowBefore = false;
-            this.allowAfter = false;
-        break;
-    }
-};
-tree.Extend.next_id = 0;
-
-tree.Extend.prototype = {
-    type: "Extend",
-    accept: function (visitor) {
-        this.selector = visitor.visit(this.selector);
-    },
-    eval: function (env) {
-        return new(tree.Extend)(this.selector.eval(env), this.option, this.index);
-    },
-    clone: function (env) {
-        return new(tree.Extend)(this.selector, this.option, this.index);
-    },
-    findSelfSelectors: function (selectors) {
-        var selfElements = [],
-            i,
-            selectorElements;
-
-        for(i = 0; i < selectors.length; i++) {
-            selectorElements = selectors[i].elements;
-            // duplicate the logic in genCSS function inside the selector node.
-            // future TODO - move both logics into the selector joiner visitor
-            if (i > 0 && selectorElements.length && selectorElements[0].combinator.value === "") {
-                selectorElements[0].combinator.value = ' ';
-            }
-            selfElements = selfElements.concat(selectors[i].elements);
-        }
-
-        this.selfSelectors = [{ elements: selfElements }];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-//
-// CSS @import node
-//
-// The general strategy here is that we don't want to wait
-// for the parsing to be completed, before we start importing
-// the file. That's because in the context of a browser,
-// most of the time will be spent waiting for the server to respond.
-//
-// On creation, we push the import path to our import queue, though
-// `import,push`, we also pass it a callback, which it'll call once
-// the file has been fetched, and parsed.
-//
-tree.Import = function (path, features, options, index, currentFileInfo) {
-    this.options = options;
-    this.index = index;
-    this.path = path;
-    this.features = features;
-    this.currentFileInfo = currentFileInfo;
-
-    if (this.options.less !== undefined || this.options.inline) {
-        this.css = !this.options.less || this.options.inline;
-    } else {
-        var pathValue = this.getPath();
-        if (pathValue && /css([\?;].*)?$/.test(pathValue)) {
-            this.css = true;
-        }
-    }
-};
-
-//
-// The actual import node doesn't return anything, when converted to CSS.
-// The reason is that it's used at the evaluation stage, so that the rules
-// it imports can be treated like any other rules.
-//
-// In `eval`, we make sure all Import nodes get evaluated, recursively, so
-// we end up with a flat structure, which can easily be imported in the parent
-// ruleset.
-//
-tree.Import.prototype = {
-    type: "Import",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        this.path = visitor.visit(this.path);
-        if (!this.options.inline && this.root) {
-            this.root = visitor.visit(this.root);
-        }
-    },
-    genCSS: function (env, output) {
-        if (this.css) {
-            output.add("@import ", this.currentFileInfo, this.index);
-            this.path.genCSS(env, output);
-            if (this.features) {
-                output.add(" ");
-                this.features.genCSS(env, output);
-            }
-            output.add(';');
-        }
-    },
-    toCSS: tree.toCSS,
-    getPath: function () {
-        if (this.path instanceof tree.Quoted) {
-            var path = this.path.value;
-            return (this.css !== undefined || /(\.[a-z]*$)|([\?;].*)$/.test(path)) ? path : path + '.less';
-        } else if (this.path instanceof tree.URL) {
-            return this.path.value.value;
-        }
-        return null;
-    },
-    evalForImport: function (env) {
-        return new(tree.Import)(this.path.eval(env), this.features, this.options, this.index, this.currentFileInfo);
-    },
-    evalPath: function (env) {
-        var path = this.path.eval(env);
-        var rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-
-        if (!(path instanceof tree.URL)) {
-            if (rootpath) {
-                var pathValue = path.value;
-                // Add the base path if the import is relative
-                if (pathValue && env.isPathRelative(pathValue)) {
-                    path.value = rootpath +pathValue;
-                }
-            }
-            path.value = env.normalizePath(path.value);
-        }
-
-        return path;
-    },
-    eval: function (env) {
-        var ruleset, features = this.features && this.features.eval(env);
-
-        if (this.skip) {
-            if (typeof this.skip === "function") {
-                this.skip = this.skip();
-            }
-            if (this.skip) {
-                return [];
-            }
-        }
-
-        if (this.options.inline) {
-            //todo needs to reference css file not import
-            var contents = new(tree.Anonymous)(this.root, 0, {filename: this.importedFilename}, true, true);
-            return this.features ? new(tree.Media)([contents], this.features.value) : [contents];
-        } else if (this.css) {
-            var newImport = new(tree.Import)(this.evalPath(env), features, this.options, this.index);
-            if (!newImport.css && this.error) {
-                throw this.error;
-            }
-            return newImport;
-        } else {
-            ruleset = new(tree.Ruleset)(null, this.root.rules.slice(0));
-
-            ruleset.evalImports(env);
-
-            return this.features ? new(tree.Media)(ruleset.rules, this.features.value) : ruleset.rules;
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.JavaScript = function (string, index, escaped) {
-    this.escaped = escaped;
-    this.expression = string;
-    this.index = index;
-};
-tree.JavaScript.prototype = {
-    type: "JavaScript",
-    eval: function (env) {
-        var result,
-            that = this,
-            context = {};
-
-        var expression = this.expression.replace(/@\{([\w-]+)\}/g, function (_, name) {
-            return tree.jsify(new(tree.Variable)('@' + name, that.index).eval(env));
-        });
-
-        try {
-            expression = new(Function)('return (' + expression + ')');
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: " + e.message + " from `" + expression + "`" ,
-                    index: this.index };
-        }
-
-        var variables = env.frames[0].variables();
-        for (var k in variables) {
-            if (variables.hasOwnProperty(k)) {
-                /*jshint loopfunc:true */
-                context[k.slice(1)] = {
-                    value: variables[k].value,
-                    toJS: function () {
-                        return this.value.eval(env).toCSS();
-                    }
-                };
-            }
-        }
-
-        try {
-            result = expression.call(context);
-        } catch (e) {
-            throw { message: "JavaScript evaluation error: '" + e.name + ': ' + e.message.replace(/["]/g, "'") + "'" ,
-                    index: this.index };
-        }
-        if (typeof(result) === 'number') {
-            return new(tree.Dimension)(result);
-        } else if (typeof(result) === 'string') {
-            return new(tree.Quoted)('"' + result + '"', result, this.escaped, this.index);
-        } else if (Array.isArray(result)) {
-            return new(tree.Anonymous)(result.join(', '));
-        } else {
-            return new(tree.Anonymous)(result);
-        }
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Keyword = function (value) { this.value = value; };
-tree.Keyword.prototype = {
-    type: "Keyword",
-    eval: function () { return this; },
-    genCSS: function (env, output) {
-        if (this.value === '%') { throw { type: "Syntax", message: "Invalid % without number" }; }
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    compare: function (other) {
-        if (other instanceof tree.Keyword) {
-            return other.value === this.value ? 0 : 1;
-        } else {
-            return -1;
-        }
-    }
-};
-
-tree.True = new(tree.Keyword)('true');
-tree.False = new(tree.Keyword)('false');
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Media = function (value, features, index, currentFileInfo) {
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-
-    var selectors = this.emptySelectors();
-
-    this.features = new(tree.Value)(features);
-    this.rules = [new(tree.Ruleset)(selectors, value)];
-    this.rules[0].allowImports = true;
-};
-tree.Media.prototype = {
-    type: "Media",
-    accept: function (visitor) {
-        if (this.features) {
-            this.features = visitor.visit(this.features);
-        }
-        if (this.rules) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    genCSS: function (env, output) {
-        output.add('@media ', this.currentFileInfo, this.index);
-        this.features.genCSS(env, output);
-        tree.outputRuleset(env, output, this.rules);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (!env.mediaBlocks) {
-            env.mediaBlocks = [];
-            env.mediaPath = [];
-        }
-
-        var media = new(tree.Media)(null, [], this.index, this.currentFileInfo);
-        if(this.debugInfo) {
-            this.rules[0].debugInfo = this.debugInfo;
-            media.debugInfo = this.debugInfo;
-        }
-        var strictMathBypass = false;
-        if (!env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            media.features = this.features.eval(env);
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-
-        env.mediaPath.push(media);
-        env.mediaBlocks.push(media);
-
-        env.frames.unshift(this.rules[0]);
-        media.rules = [this.rules[0].eval(env)];
-        env.frames.shift();
-
-        env.mediaPath.pop();
-
-        return env.mediaPath.length === 0 ? media.evalTop(env) :
-                    media.evalNested(env);
-    },
-    variable: function (name) { return tree.Ruleset.prototype.variable.call(this.rules[0], name); },
-    find: function () { return tree.Ruleset.prototype.find.apply(this.rules[0], arguments); },
-    rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.rules[0]); },
-    emptySelectors: function() {
-        var el = new(tree.Element)('', '&', this.index, this.currentFileInfo),
-            sels = [new(tree.Selector)([el], null, null, this.index, this.currentFileInfo)];
-        sels[0].mediaEmpty = true;
-        return sels;
-    },
-    markReferenced: function () {
-        var i, rules = this.rules[0].rules;
-        this.rules[0].markReferenced();
-        this.isReferenced = true;
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i].markReferenced) {
-                rules[i].markReferenced();
-            }
-        }
-    },
-
-    evalTop: function (env) {
-        var result = this;
-
-        // Render all dependent Media blocks.
-        if (env.mediaBlocks.length > 1) {
-            var selectors = this.emptySelectors();
-            result = new(tree.Ruleset)(selectors, env.mediaBlocks);
-            result.multiMedia = true;
-        }
-
-        delete env.mediaBlocks;
-        delete env.mediaPath;
-
-        return result;
-    },
-    evalNested: function (env) {
-        var i, value,
-            path = env.mediaPath.concat([this]);
-
-        // Extract the media-query conditions separated with `,` (OR).
-        for (i = 0; i < path.length; i++) {
-            value = path[i].features instanceof tree.Value ?
-                        path[i].features.value : path[i].features;
-            path[i] = Array.isArray(value) ? value : [value];
-        }
-
-        // Trace all permutations to generate the resulting media-query.
-        //
-        // (a, b and c) with nested (d, e) ->
-        //    a and d
-        //    a and e
-        //    b and c and d
-        //    b and c and e
-        this.features = new(tree.Value)(this.permute(path).map(function (path) {
-            path = path.map(function (fragment) {
-                return fragment.toCSS ? fragment : new(tree.Anonymous)(fragment);
-            });
-
-            for(i = path.length - 1; i > 0; i--) {
-                path.splice(i, 0, new(tree.Anonymous)("and"));
-            }
-
-            return new(tree.Expression)(path);
-        }));
-
-        // Fake a tree-node that doesn't output anything.
-        return new(tree.Ruleset)([], []);
-    },
-    permute: function (arr) {
-      if (arr.length === 0) {
-          return [];
-      } else if (arr.length === 1) {
-          return arr[0];
-      } else {
-          var result = [];
-          var rest = this.permute(arr.slice(1));
-          for (var i = 0; i < rest.length; i++) {
-              for (var j = 0; j < arr[0].length; j++) {
-                  result.push([arr[0][j]].concat(rest[i]));
-              }
-          }
-          return result;
-      }
-    },
-    bubbleSelectors: function (selectors) {
-      if (!selectors)
-        return;
-      this.rules = [new(tree.Ruleset)(selectors.slice(0), [this.rules[0]])];
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.mixin = {};
-tree.mixin.Call = function (elements, args, index, currentFileInfo, important) {
-    this.selector = new(tree.Selector)(elements);
-    this.arguments = (args && args.length) ? args : null;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.important = important;
-};
-tree.mixin.Call.prototype = {
-    type: "MixinCall",
-    accept: function (visitor) {
-        if (this.selector) {
-            this.selector = visitor.visit(this.selector);
-        }
-        if (this.arguments) {
-            this.arguments = visitor.visitArray(this.arguments);
-        }
-    },
-    eval: function (env) {
-        var mixins, mixin, args, rules = [], match = false, i, m, f, isRecursive, isOneFound, rule,
-            candidates = [], candidate, conditionResult = [], defaultFunc = tree.defaultFunc,
-            defaultResult, defNone = 0, defTrue = 1, defFalse = 2, count, originalRuleset;
-
-        args = this.arguments && this.arguments.map(function (a) {
-            return { name: a.name, value: a.value.eval(env) };
-        });
-
-        for (i = 0; i < env.frames.length; i++) {
-            if ((mixins = env.frames[i].find(this.selector)).length > 0) {
-                isOneFound = true;
-
-                // To make `default()` function independent of definition order we have two "subpasses" here.
-                // At first we evaluate each guard *twice* (with `default() == true` and `default() == false`),
-                // and build candidate list with corresponding flags. Then, when we know all possible matches,
-                // we make a final decision.
-
-                for (m = 0; m < mixins.length; m++) {
-                    mixin = mixins[m];
-                    isRecursive = false;
-                    for(f = 0; f < env.frames.length; f++) {
-                        if ((!(mixin instanceof tree.mixin.Definition)) && mixin === (env.frames[f].originalRuleset || env.frames[f])) {
-                            isRecursive = true;
-                            break;
-                        }
-                    }
-                    if (isRecursive) {
-                        continue;
-                    }
-
-                    if (mixin.matchArgs(args, env)) {
-                        candidate = {mixin: mixin, group: defNone};
-
-                        if (mixin.matchCondition) {
-                            for (f = 0; f < 2; f++) {
-                                defaultFunc.value(f);
-                                conditionResult[f] = mixin.matchCondition(args, env);
-                            }
-                            if (conditionResult[0] || conditionResult[1]) {
-                                if (conditionResult[0] != conditionResult[1]) {
-                                    candidate.group = conditionResult[1] ?
-                                        defTrue : defFalse;
-                                }
-
-                                candidates.push(candidate);
-                            }
-                        }
-                        else {
-                            candidates.push(candidate);
-                        }
-
-                        match = true;
-                    }
-                }
-
-                defaultFunc.reset();
-
-                count = [0, 0, 0];
-                for (m = 0; m < candidates.length; m++) {
-                    count[candidates[m].group]++;
-                }
-
-                if (count[defNone] > 0) {
-                    defaultResult = defFalse;
-                } else {
-                    defaultResult = defTrue;
-                    if ((count[defTrue] + count[defFalse]) > 1) {
-                        throw { type: 'Runtime',
-                            message: 'Ambiguous use of `default()` found when matching for `'
-                                + this.format(args) + '`',
-                            index: this.index, filename: this.currentFileInfo.filename };
-                    }
-                }
-
-                for (m = 0; m < candidates.length; m++) {
-                    candidate = candidates[m].group;
-                    if ((candidate === defNone) || (candidate === defaultResult)) {
-                        try {
-                            mixin = candidates[m].mixin;
-                            if (!(mixin instanceof tree.mixin.Definition)) {
-                                originalRuleset = mixin.originalRuleset || mixin;
-                                mixin = new tree.mixin.Definition("", [], mixin.rules, null, false);
-                                mixin.originalRuleset = originalRuleset;
-                            }
-                            Array.prototype.push.apply(
-                                  rules, mixin.evalCall(env, args, this.important).rules);
-                        } catch (e) {
-                            throw { message: e.message, index: this.index, filename: this.currentFileInfo.filename, stack: e.stack };
-                        }
-                    }
-                }
-
-                if (match) {
-                    if (!this.currentFileInfo || !this.currentFileInfo.reference) {
-                        for (i = 0; i < rules.length; i++) {
-                            rule = rules[i];
-                            if (rule.markReferenced) {
-                                rule.markReferenced();
-                            }
-                        }
-                    }
-                    return rules;
-                }
-            }
-        }
-        if (isOneFound) {
-            throw { type:    'Runtime',
-                    message: 'No matching definition was found for `' + this.format(args) + '`',
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        } else {
-            throw { type:    'Name',
-                    message: this.selector.toCSS().trim() + " is undefined",
-                    index:   this.index, filename: this.currentFileInfo.filename };
-        }
-    },
-    format: function (args) {
-        return this.selector.toCSS().trim() + '(' +
-            (args ? args.map(function (a) {
-                var argValue = "";
-                if (a.name) {
-                    argValue += a.name + ":";
-                }
-                if (a.value.toCSS) {
-                    argValue += a.value.toCSS();
-                } else {
-                    argValue += "???";
-                }
-                return argValue;
-            }).join(', ') : "") + ")";
-    }
-};
-
-tree.mixin.Definition = function (name, params, rules, condition, variadic, frames) {
-    this.name = name;
-    this.selectors = [new(tree.Selector)([new(tree.Element)(null, name, this.index, this.currentFileInfo)])];
-    this.params = params;
-    this.condition = condition;
-    this.variadic = variadic;
-    this.arity = params.length;
-    this.rules = rules;
-    this._lookups = {};
-    this.required = params.reduce(function (count, p) {
-        if (!p.name || (p.name && !p.value)) { return count + 1; }
-        else                                 { return count; }
-    }, 0);
-    this.parent = tree.Ruleset.prototype;
-    this.frames = frames;
-};
-tree.mixin.Definition.prototype = {
-    type: "MixinDefinition",
-    accept: function (visitor) {
-        if (this.params && this.params.length) {
-            this.params = visitor.visitArray(this.params);
-        }
-        this.rules = visitor.visitArray(this.rules);
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    variable:  function (name) { return this.parent.variable.call(this, name); },
-    variables: function ()     { return this.parent.variables.call(this); },
-    find:      function ()     { return this.parent.find.apply(this, arguments); },
-    rulesets:  function ()     { return this.parent.rulesets.apply(this); },
-
-    evalParams: function (env, mixinEnv, args, evaldArguments) {
-        /*jshint boss:true */
-        var frame = new(tree.Ruleset)(null, null),
-            varargs, arg,
-            params = this.params.slice(0),
-            i, j, val, name, isNamedFound, argIndex, argsLength = 0;
-
-        mixinEnv = new tree.evalEnv(mixinEnv, [frame].concat(mixinEnv.frames));
-
-        if (args) {
-            args = args.slice(0);
-            argsLength = args.length;
-
-            for(i = 0; i < argsLength; i++) {
-                arg = args[i];
-                if (name = (arg && arg.name)) {
-                    isNamedFound = false;
-                    for(j = 0; j < params.length; j++) {
-                        if (!evaldArguments[j] && name === params[j].name) {
-                            evaldArguments[j] = arg.value.eval(env);
-                            frame.prependRule(new(tree.Rule)(name, arg.value.eval(env)));
-                            isNamedFound = true;
-                            break;
-                        }
-                    }
-                    if (isNamedFound) {
-                        args.splice(i, 1);
-                        i--;
-                        continue;
-                    } else {
-                        throw { type: 'Runtime', message: "Named argument for " + this.name +
-                            ' ' + args[i].name + ' not found' };
-                    }
-                }
-            }
-        }
-        argIndex = 0;
-        for (i = 0; i < params.length; i++) {
-            if (evaldArguments[i]) { continue; }
-
-            arg = args && args[argIndex];
-
-            if (name = params[i].name) {
-                if (params[i].variadic) {
-                    varargs = [];
-                    for (j = argIndex; j < argsLength; j++) {
-                        varargs.push(args[j].value.eval(env));
-                    }
-                    frame.prependRule(new(tree.Rule)(name, new(tree.Expression)(varargs).eval(env)));
-                } else {
-                    val = arg && arg.value;
-                    if (val) {
-                        val = val.eval(env);
-                    } else if (params[i].value) {
-                        val = params[i].value.eval(mixinEnv);
-                        frame.resetCache();
-                    } else {
-                        throw { type: 'Runtime', message: "wrong number of arguments for " + this.name +
-                            ' (' + argsLength + ' for ' + this.arity + ')' };
-                    }
-
-                    frame.prependRule(new(tree.Rule)(name, val));
-                    evaldArguments[i] = val;
-                }
-            }
-
-            if (params[i].variadic && args) {
-                for (j = argIndex; j < argsLength; j++) {
-                    evaldArguments[j] = args[j].value.eval(env);
-                }
-            }
-            argIndex++;
-        }
-
-        return frame;
-    },
-    eval: function (env) {
-        return new tree.mixin.Definition(this.name, this.params, this.rules, this.condition, this.variadic, this.frames || env.frames.slice(0));
-    },
-    evalCall: function (env, args, important) {
-        var _arguments = [],
-            mixinFrames = this.frames ? this.frames.concat(env.frames) : env.frames,
-            frame = this.evalParams(env, new(tree.evalEnv)(env, mixinFrames), args, _arguments),
-            rules, ruleset;
-
-        frame.prependRule(new(tree.Rule)('@arguments', new(tree.Expression)(_arguments).eval(env)));
-
-        rules = this.rules.slice(0);
-
-        ruleset = new(tree.Ruleset)(null, rules);
-        ruleset.originalRuleset = this;
-        ruleset = ruleset.eval(new(tree.evalEnv)(env, [this, frame].concat(mixinFrames)));
-        if (important) {
-            ruleset = this.parent.makeImportant.apply(ruleset);
-        }
-        return ruleset;
-    },
-    matchCondition: function (args, env) {
-        if (this.condition && !this.condition.eval(
-            new(tree.evalEnv)(env,
-                [this.evalParams(env, new(tree.evalEnv)(env, this.frames ? this.frames.concat(env.frames) : env.frames), args, [])] // the parameter variables
-                    .concat(this.frames) // the parent namespace/mixin frames
-                    .concat(env.frames)))) { // the current environment frames
-            return false;
-        }
-        return true;
-    },
-    matchArgs: function (args, env) {
-        var argsLength = (args && args.length) || 0, len;
-
-        if (! this.variadic) {
-            if (argsLength < this.required)                               { return false; }
-            if (argsLength > this.params.length)                          { return false; }
-        } else {
-            if (argsLength < (this.required - 1))                         { return false; }
-        }
-
-        len = Math.min(argsLength, this.arity);
-
-        for (var i = 0; i < len; i++) {
-            if (!this.params[i].name && !this.params[i].variadic) {
-                if (args[i].value.eval(env).toCSS() != this.params[i].value.eval(env).toCSS()) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Negative = function (node) {
-    this.value = node;
-};
-tree.Negative.prototype = {
-    type: "Negative",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('-');
-        this.value.genCSS(env, output);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        if (env.isMathOn()) {
-            return (new(tree.Operation)('*', [new(tree.Dimension)(-1), this.value])).eval(env);
-        }
-        return new(tree.Negative)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Operation = function (op, operands, isSpaced) {
-    this.op = op.trim();
-    this.operands = operands;
-    this.isSpaced = isSpaced;
-};
-tree.Operation.prototype = {
-    type: "Operation",
-    accept: function (visitor) {
-        this.operands = visitor.visit(this.operands);
-    },
-    eval: function (env) {
-        var a = this.operands[0].eval(env),
-            b = this.operands[1].eval(env);
-
-        if (env.isMathOn()) {
-            if (a instanceof tree.Dimension && b instanceof tree.Color) {
-                a = a.toColor();
-            }
-            if (b instanceof tree.Dimension && a instanceof tree.Color) {
-                b = b.toColor();
-            }
-            if (!a.operate) {
-                throw { type: "Operation",
-                        message: "Operation on an invalid type" };
-            }
-
-            return a.operate(env, this.op, b);
-        } else {
-            return new(tree.Operation)(this.op, [a, b], this.isSpaced);
-        }
-    },
-    genCSS: function (env, output) {
-        this.operands[0].genCSS(env, output);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        output.add(this.op);
-        if (this.isSpaced) {
-            output.add(" ");
-        }
-        this.operands[1].genCSS(env, output);
-    },
-    toCSS: tree.toCSS
-};
-
-tree.operate = function (env, op, a, b) {
-    switch (op) {
-        case '+': return a + b;
-        case '-': return a - b;
-        case '*': return a * b;
-        case '/': return a / b;
-    }
-};
-
-})(require('../tree'));
-
-
-(function (tree) {
-
-tree.Paren = function (node) {
-    this.value = node;
-};
-tree.Paren.prototype = {
-    type: "Paren",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add('(');
-        this.value.genCSS(env, output);
-        output.add(')');
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        return new(tree.Paren)(this.value.eval(env));
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Quoted = function (str, content, escaped, index, currentFileInfo) {
-    this.escaped = escaped;
-    this.value = content || '';
-    this.quote = str.charAt(0);
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-};
-tree.Quoted.prototype = {
-    type: "Quoted",
-    genCSS: function (env, output) {
-        if (!this.escaped) {
-            output.add(this.quote, this.currentFileInfo, this.index);
-        }
-        output.add(this.value);
-        if (!this.escaped) {
-            output.add(this.quote);
-        }
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var that = this;
-        var value = this.value.replace(/`([^`]+)`/g, function (_, exp) {
-            return new(tree.JavaScript)(exp, that.index, true).eval(env).value;
-        }).replace(/@\{([\w-]+)\}/g, function (_, name) {
-            var v = new(tree.Variable)('@' + name, that.index, that.currentFileInfo).eval(env, true);
-            return (v instanceof tree.Quoted) ? v.value : v.toCSS();
-        });
-        return new(tree.Quoted)(this.quote + value + this.quote, value, this.escaped, this.index, this.currentFileInfo);
-    },
-    compare: function (x) {
-        if (!x.toCSS) {
-            return -1;
-        }
-
-        var left, right;
-
-        // when comparing quoted strings allow the quote to differ
-        if (x.type === "Quoted" && !this.escaped && !x.escaped) {
-            left = x.value;
-            right = this.value;
-        } else {
-            left = this.toCSS();
-            right = x.toCSS();
-        }
-
-        if (left === right) {
-            return 0;
-        }
-
-        return left < right ? -1 : 1;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Rule = function (name, value, important, merge, index, currentFileInfo, inline, variable) {
-    this.name = name;
-    this.value = (value instanceof tree.Value || value instanceof tree.Ruleset) ? value : new(tree.Value)([value]);
-    this.important = important ? ' ' + important.trim() : '';
-    this.merge = merge;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo;
-    this.inline = inline || false;
-    this.variable = (variable !== undefined) ? variable
-        : (name.charAt && (name.charAt(0) === '@'));
-};
-
-tree.Rule.prototype = {
-    type: "Rule",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add(this.name + (env.compress ? ':' : ': '), this.currentFileInfo, this.index);
-        try {
-            this.value.genCSS(env, output);
-        }
-        catch(e) {
-            e.index = this.index;
-            e.filename = this.currentFileInfo.filename;
-            throw e;
-        }
-        output.add(this.important + ((this.inline || (env.lastRule && env.compress)) ? "" : ";"), this.currentFileInfo, this.index);
-    },
-    toCSS: tree.toCSS,
-    eval: function (env) {
-        var strictMathBypass = false, name = this.name, variable = this.variable, evaldValue;
-        if (typeof name !== "string") {
-            // expand 'primitive' name directly to get
-            // things faster (~10% for benchmark.less):
-            name = (name.length === 1)
-                && (name[0] instanceof tree.Keyword)
-                    ? name[0].value : evalName(env, name);
-            variable = false; // never treat expanded interpolation as new variable name
-        }
-        if (name === "font" && !env.strictMath) {
-            strictMathBypass = true;
-            env.strictMath = true;
-        }
-        try {
-            evaldValue = this.value.eval(env);
-
-            if (!this.variable && evaldValue.type === "DetachedRuleset") {
-                throw { message: "Rulesets cannot be evaluated on a property.",
-                        index: this.index, filename: this.currentFileInfo.filename };
-            }
-
-            return new(tree.Rule)(name,
-                              evaldValue,
-                              this.important,
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline,
-                              variable);
-        }
-        catch(e) {
-            if (typeof e.index !== 'number') {
-                e.index = this.index;
-                e.filename = this.currentFileInfo.filename;
-            }
-            throw e;
-        }
-        finally {
-            if (strictMathBypass) {
-                env.strictMath = false;
-            }
-        }
-    },
-    makeImportant: function () {
-        return new(tree.Rule)(this.name,
-                              this.value,
-                              "!important",
-                              this.merge,
-                              this.index, this.currentFileInfo, this.inline);
-    }
-};
-
-function evalName(env, name) {
-    var value = "", i, n = name.length,
-        output = {add: function (s) {value += s;}};
-    for (i = 0; i < n; i++) {
-        name[i].eval(env).genCSS(env, output);
-    }
-    return value;
-}
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.RulesetCall = function (variable) {
-    this.variable = variable;
-};
-tree.RulesetCall.prototype = {
-    type: "RulesetCall",
-    accept: function (visitor) {
-    },
-    eval: function (env) {
-        var detachedRuleset = new(tree.Variable)(this.variable).eval(env);
-        return detachedRuleset.callEval(env);
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Ruleset = function (selectors, rules, strictImports) {
-    this.selectors = selectors;
-    this.rules = rules;
-    this._lookups = {};
-    this.strictImports = strictImports;
-};
-tree.Ruleset.prototype = {
-    type: "Ruleset",
-    accept: function (visitor) {
-        if (this.paths) {
-            visitor.visitArray(this.paths, true);
-        } else if (this.selectors) {
-            this.selectors = visitor.visitArray(this.selectors);
-        }
-        if (this.rules && this.rules.length) {
-            this.rules = visitor.visitArray(this.rules);
-        }
-    },
-    eval: function (env) {
-        var thisSelectors = this.selectors, selectors,
-            selCnt, selector, i, defaultFunc = tree.defaultFunc, hasOnePassingSelector = false;
-
-        if (thisSelectors && (selCnt = thisSelectors.length)) {
-            selectors = [];
-            defaultFunc.error({
-                type: "Syntax",
-                message: "it is currently only allowed in parametric mixin guards,"
-            });
-            for (i = 0; i < selCnt; i++) {
-                selector = thisSelectors[i].eval(env);
-                selectors.push(selector);
-                if (selector.evaldCondition) {
-                    hasOnePassingSelector = true;
-                }
-            }
-            defaultFunc.reset();
-        } else {
-            hasOnePassingSelector = true;
-        }
-
-        var rules = this.rules ? this.rules.slice(0) : null,
-            ruleset = new(tree.Ruleset)(selectors, rules, this.strictImports),
-            rule, subRule;
-
-        ruleset.originalRuleset = this;
-        ruleset.root = this.root;
-        ruleset.firstRoot = this.firstRoot;
-        ruleset.allowImports = this.allowImports;
-
-        if(this.debugInfo) {
-            ruleset.debugInfo = this.debugInfo;
-        }
-
-        if (!hasOnePassingSelector) {
-            rules.length = 0;
-        }
-
-        // push the current ruleset to the frames stack
-        var envFrames = env.frames;
-        envFrames.unshift(ruleset);
-
-        // currrent selectors
-        var envSelectors = env.selectors;
-        if (!envSelectors) {
-            env.selectors = envSelectors = [];
-        }
-        envSelectors.unshift(this.selectors);
-
-        // Evaluate imports
-        if (ruleset.root || ruleset.allowImports || !ruleset.strictImports) {
-            ruleset.evalImports(env);
-        }
-
-        // Store the frames around mixin definitions,
-        // so they can be evaluated like closures when the time comes.
-        var rsRules = ruleset.rules, rsRuleCnt = rsRules ? rsRules.length : 0;
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Definition || rsRules[i] instanceof tree.DetachedRuleset) {
-                rsRules[i] = rsRules[i].eval(env);
-            }
-        }
-
-        var mediaBlockCount = (env.mediaBlocks && env.mediaBlocks.length) || 0;
-
-        // Evaluate mixin calls.
-        for (i = 0; i < rsRuleCnt; i++) {
-            if (rsRules[i] instanceof tree.mixin.Call) {
-                /*jshint loopfunc:true */
-                rules = rsRules[i].eval(env).filter(function(r) {
-                    if ((r instanceof tree.Rule) && r.variable) {
-                        // do not pollute the scope if the variable is
-                        // already there. consider returning false here
-                        // but we need a way to "return" variable from mixins
-                        return !(ruleset.variable(r.name));
-                    }
-                    return true;
-                });
-                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
-                rsRuleCnt += rules.length - 1;
-                i += rules.length-1;
-                ruleset.resetCache();
-            } else if (rsRules[i] instanceof tree.RulesetCall) {
-                /*jshint loopfunc:true */
-                rules = rsRules[i].eval(env).rules.filter(function(r) {
-                    if ((r instanceof tree.Rule) && r.variable) {
-                        // do not pollute the scope at all
-                        return false;
-                    }
-                    return true;
-                });
-                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
-                rsRuleCnt += rules.length - 1;
-                i += rules.length-1;
-                ruleset.resetCache();
-            }
-        }
-
-        // Evaluate everything else
-        for (i = 0; i < rsRules.length; i++) {
-            rule = rsRules[i];
-            if (! (rule instanceof tree.mixin.Definition || rule instanceof tree.DetachedRuleset)) {
-                rsRules[i] = rule = rule.eval ? rule.eval(env) : rule;
-            }
-        }
-
-        // Evaluate everything else
-        for (i = 0; i < rsRules.length; i++) {
-            rule = rsRules[i];
-            // for rulesets, check if it is a css guard and can be removed
-            if (rule instanceof tree.Ruleset && rule.selectors && rule.selectors.length === 1) {
-                // check if it can be folded in (e.g. & where)
-                if (rule.selectors[0].isJustParentSelector()) {
-                    rsRules.splice(i--, 1);
-
-                    for(var j = 0; j < rule.rules.length; j++) {
-                        subRule = rule.rules[j];
-                        if (!(subRule instanceof tree.Rule) || !subRule.variable) {
-                            rsRules.splice(++i, 0, subRule);
-                        }
-                    }
-                }
-            }
-        }
-
-        // Pop the stack
-        envFrames.shift();
-        envSelectors.shift();
-
-        if (env.mediaBlocks) {
-            for (i = mediaBlockCount; i < env.mediaBlocks.length; i++) {
-                env.mediaBlocks[i].bubbleSelectors(selectors);
-            }
-        }
-
-        return ruleset;
-    },
-    evalImports: function(env) {
-        var rules = this.rules, i, importRules;
-        if (!rules) { return; }
-
-        for (i = 0; i < rules.length; i++) {
-            if (rules[i] instanceof tree.Import) {
-                importRules = rules[i].eval(env);
-                if (importRules && importRules.length) {
-                    rules.splice.apply(rules, [i, 1].concat(importRules));
-                    i+= importRules.length-1;
-                } else {
-                    rules.splice(i, 1, importRules);
-                }
-                this.resetCache();
-            }
-        }
-    },
-    makeImportant: function() {
-        return new tree.Ruleset(this.selectors, this.rules.map(function (r) {
-                    if (r.makeImportant) {
-                        return r.makeImportant();
-                    } else {
-                        return r;
-                    }
-                }), this.strictImports);
-    },
-    matchArgs: function (args) {
-        return !args || args.length === 0;
-    },
-    // lets you call a css selector with a guard
-    matchCondition: function (args, env) {
-        var lastSelector = this.selectors[this.selectors.length-1];
-        if (!lastSelector.evaldCondition) {
-            return false;
-        }
-        if (lastSelector.condition &&
-            !lastSelector.condition.eval(
-                new(tree.evalEnv)(env,
-                    env.frames))) {
-            return false;
-        }
-        return true;
-    },
-    resetCache: function () {
-        this._rulesets = null;
-        this._variables = null;
-        this._lookups = {};
-    },
-    variables: function () {
-        if (!this._variables) {
-            this._variables = !this.rules ? {} : this.rules.reduce(function (hash, r) {
-                if (r instanceof tree.Rule && r.variable === true) {
-                    hash[r.name] = r;
-                }
-                return hash;
-            }, {});
-        }
-        return this._variables;
-    },
-    variable: function (name) {
-        return this.variables()[name];
-    },
-    rulesets: function () {
-        if (!this.rules) { return null; }
-
-        var _Ruleset = tree.Ruleset, _MixinDefinition = tree.mixin.Definition,
-            filtRules = [], rules = this.rules, cnt = rules.length,
-            i, rule;
-
-        for (i = 0; i < cnt; i++) {
-            rule = rules[i];
-            if ((rule instanceof _Ruleset) || (rule instanceof _MixinDefinition)) {
-                filtRules.push(rule);
-            }
-        }
-
-        return filtRules;
-    },
-    prependRule: function (rule) {
-        var rules = this.rules;
-        if (rules) { rules.unshift(rule); } else { this.rules = [ rule ]; }
-    },
-    find: function (selector, self) {
-        self = self || this;
-        var rules = [], match,
-            key = selector.toCSS();
-
-        if (key in this._lookups) { return this._lookups[key]; }
-
-        this.rulesets().forEach(function (rule) {
-            if (rule !== self) {
-                for (var j = 0; j < rule.selectors.length; j++) {
-                    match = selector.match(rule.selectors[j]);
-                    if (match) {
-                        if (selector.elements.length > match) {
-                            Array.prototype.push.apply(rules, rule.find(
-                                new(tree.Selector)(selector.elements.slice(match)), self));
-                        } else {
-                            rules.push(rule);
-                        }
-                        break;
-                    }
-                }
-            }
-        });
-        this._lookups[key] = rules;
-        return rules;
-    },
-    genCSS: function (env, output) {
-        var i, j,
-            charsetRuleNodes = [],
-            ruleNodes = [],
-            rulesetNodes = [],
-            rulesetNodeCnt,
-            debugInfo,     // Line number debugging
-            rule,
-            path;
-
-        env.tabLevel = (env.tabLevel || 0);
-
-        if (!this.root) {
-            env.tabLevel++;
-        }
-
-        var tabRuleStr = env.compress ? '' : Array(env.tabLevel + 1).join("  "),
-            tabSetStr = env.compress ? '' : Array(env.tabLevel).join("  "),
-            sep;
-
-        function isRulesetLikeNode(rule, root) {
-             // if it has nested rules, then it should be treated like a ruleset
-             if (rule.rules)
-                 return true;
-
-             // medias and comments do not have nested rules, but should be treated like rulesets anyway
-             if ( (rule instanceof tree.Media) || (root && rule instanceof tree.Comment))
-                 return true;
-
-             // some directives and anonumoust nodes are ruleset like, others are not
-             if ((rule instanceof tree.Directive) || (rule instanceof tree.Anonymous)) {
-                 return rule.isRulesetLike();
-             }
-
-             //anything else is assumed to be a rule
-             return false;
-        }
-
-        for (i = 0; i < this.rules.length; i++) {
-            rule = this.rules[i];
-            if (isRulesetLikeNode(rule, this.root)) {
-                rulesetNodes.push(rule);
-            } else {
-                //charsets should float on top of everything
-                if (rule.isCharset && rule.isCharset()) {
-                    charsetRuleNodes.push(rule);
-                } else {
-                    ruleNodes.push(rule);
-                }
-            }
-        }
-        ruleNodes = charsetRuleNodes.concat(ruleNodes);
-
-        // If this is the root node, we don't render
-        // a selector, or {}.
-        if (!this.root) {
-            debugInfo = tree.debugInfo(env, this, tabSetStr);
-
-            if (debugInfo) {
-                output.add(debugInfo);
-                output.add(tabSetStr);
-            }
-
-            var paths = this.paths, pathCnt = paths.length,
-                pathSubCnt;
-
-            sep = env.compress ? ',' : (',\n' + tabSetStr);
-
-            for (i = 0; i < pathCnt; i++) {
-                path = paths[i];
-                if (!(pathSubCnt = path.length)) { continue; }
-                if (i > 0) { output.add(sep); }
-
-                env.firstSelector = true;
-                path[0].genCSS(env, output);
-
-                env.firstSelector = false;
-                for (j = 1; j < pathSubCnt; j++) {
-                    path[j].genCSS(env, output);
-                }
-            }
-
-            output.add((env.compress ? '{' : ' {\n') + tabRuleStr);
-        }
-
-        // Compile rules and rulesets
-        for (i = 0; i < ruleNodes.length; i++) {
-            rule = ruleNodes[i];
-
-            // @page{ directive ends up with root elements inside it, a mix of rules and rulesets
-            // In this instance we do not know whether it is the last property
-            if (i + 1 === ruleNodes.length && (!this.root || rulesetNodes.length === 0 || this.firstRoot)) {
-                env.lastRule = true;
-            }
-
-            if (rule.genCSS) {
-                rule.genCSS(env, output);
-            } else if (rule.value) {
-                output.add(rule.value.toString());
-            }
-
-            if (!env.lastRule) {
-                output.add(env.compress ? '' : ('\n' + tabRuleStr));
-            } else {
-                env.lastRule = false;
-            }
-        }
-
-        if (!this.root) {
-            output.add((env.compress ? '}' : '\n' + tabSetStr + '}'));
-            env.tabLevel--;
-        }
-
-        sep = (env.compress ? "" : "\n") + (this.root ? tabRuleStr : tabSetStr);
-        rulesetNodeCnt = rulesetNodes.length;
-        if (rulesetNodeCnt) {
-            if (ruleNodes.length && sep) { output.add(sep); }
-            rulesetNodes[0].genCSS(env, output);
-            for (i = 1; i < rulesetNodeCnt; i++) {
-                if (sep) { output.add(sep); }
-                rulesetNodes[i].genCSS(env, output);
-            }
-        }
-
-        if (!output.isEmpty() && !env.compress && this.firstRoot) {
-            output.add('\n');
-        }
-    },
-
-    toCSS: tree.toCSS,
-
-    markReferenced: function () {
-        if (!this.selectors) {
-            return;
-        }
-        for (var s = 0; s < this.selectors.length; s++) {
-            this.selectors[s].markReferenced();
-        }
-    },
-
-    joinSelectors: function (paths, context, selectors) {
-        for (var s = 0; s < selectors.length; s++) {
-            this.joinSelector(paths, context, selectors[s]);
-        }
-    },
-
-    joinSelector: function (paths, context, selector) {
-
-        var i, j, k,
-            hasParentSelector, newSelectors, el, sel, parentSel,
-            newSelectorPath, afterParentJoin, newJoinedSelector,
-            newJoinedSelectorEmpty, lastSelector, currentElements,
-            selectorsMultiplied;
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            if (el.value === '&') {
-                hasParentSelector = true;
-            }
-        }
-
-        if (!hasParentSelector) {
-            if (context.length > 0) {
-                for (i = 0; i < context.length; i++) {
-                    paths.push(context[i].concat(selector));
-                }
-            }
-            else {
-                paths.push([selector]);
-            }
-            return;
-        }
-
-        // The paths are [[Selector]]
-        // The first list is a list of comma seperated selectors
-        // The inner list is a list of inheritance seperated selectors
-        // e.g.
-        // .a, .b {
-        //   .c {
-        //   }
-        // }
-        // == [[.a] [.c]] [[.b] [.c]]
-        //
-
-        // the elements from the current selector so far
-        currentElements = [];
-        // the current list of new selectors to add to the path.
-        // We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
-        // by the parents
-        newSelectors = [[]];
-
-        for (i = 0; i < selector.elements.length; i++) {
-            el = selector.elements[i];
-            // non parent reference elements just get added
-            if (el.value !== "&") {
-                currentElements.push(el);
-            } else {
-                // the new list of selectors to add
-                selectorsMultiplied = [];
-
-                // merge the current list of non parent selector elements
-                // on to the current list of selectors to add
-                if (currentElements.length > 0) {
-                    this.mergeElementsOnToSelectors(currentElements, newSelectors);
-                }
-
-                // loop through our current selectors
-                for (j = 0; j < newSelectors.length; j++) {
-                    sel = newSelectors[j];
-                    // if we don't have any parent paths, the & might be in a mixin so that it can be used
-                    // whether there are parents or not
-                    if (context.length === 0) {
-                        // the combinator used on el should now be applied to the next element instead so that
-                        // it is not lost
-                        if (sel.length > 0) {
-                            sel[0].elements = sel[0].elements.slice(0);
-                            sel[0].elements.push(new(tree.Element)(el.combinator, '', el.index, el.currentFileInfo));
-                        }
-                        selectorsMultiplied.push(sel);
-                    }
-                    else {
-                        // and the parent selectors
-                        for (k = 0; k < context.length; k++) {
-                            parentSel = context[k];
-                            // We need to put the current selectors
-                            // then join the last selector's elements on to the parents selectors
-
-                            // our new selector path
-                            newSelectorPath = [];
-                            // selectors from the parent after the join
-                            afterParentJoin = [];
-                            newJoinedSelectorEmpty = true;
-
-                            //construct the joined selector - if & is the first thing this will be empty,
-                            // if not newJoinedSelector will be the last set of elements in the selector
-                            if (sel.length > 0) {
-                                newSelectorPath = sel.slice(0);
-                                lastSelector = newSelectorPath.pop();
-                                newJoinedSelector = selector.createDerived(lastSelector.elements.slice(0));
-                                newJoinedSelectorEmpty = false;
-                            }
-                            else {
-                                newJoinedSelector = selector.createDerived([]);
-                            }
-
-                            //put together the parent selectors after the join
-                            if (parentSel.length > 1) {
-                                afterParentJoin = afterParentJoin.concat(parentSel.slice(1));
-                            }
-
-                            if (parentSel.length > 0) {
-                                newJoinedSelectorEmpty = false;
-
-                                // join the elements so far with the first part of the parent
-                                newJoinedSelector.elements.push(new(tree.Element)(el.combinator, parentSel[0].elements[0].value, el.index, el.currentFileInfo));
-                                newJoinedSelector.elements = newJoinedSelector.elements.concat(parentSel[0].elements.slice(1));
-                            }
-
-                            if (!newJoinedSelectorEmpty) {
-                                // now add the joined selector
-                                newSelectorPath.push(newJoinedSelector);
-                            }
-
-                            // and the rest of the parent
-                            newSelectorPath = newSelectorPath.concat(afterParentJoin);
-
-                            // add that to our new set of selectors
-                            selectorsMultiplied.push(newSelectorPath);
-                        }
-                    }
-                }
-
-                // our new selectors has been multiplied, so reset the state
-                newSelectors = selectorsMultiplied;
-                currentElements = [];
-            }
-        }
-
-        // if we have any elements left over (e.g. .a& .b == .b)
-        // add them on to all the current selectors
-        if (currentElements.length > 0) {
-            this.mergeElementsOnToSelectors(currentElements, newSelectors);
-        }
-
-        for (i = 0; i < newSelectors.length; i++) {
-            if (newSelectors[i].length > 0) {
-                paths.push(newSelectors[i]);
-            }
-        }
-    },
-
-    mergeElementsOnToSelectors: function(elements, selectors) {
-        var i, sel;
-
-        if (selectors.length === 0) {
-            selectors.push([ new(tree.Selector)(elements) ]);
-            return;
-        }
-
-        for (i = 0; i < selectors.length; i++) {
-            sel = selectors[i];
-
-            // if the previous thing in sel is a parent this needs to join on to it
-            if (sel.length > 0) {
-                sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));
-            }
-            else {
-                sel.push(new(tree.Selector)(elements));
-            }
-        }
-    }
-};
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Selector = function (elements, extendList, condition, index, currentFileInfo, isReferenced) {
-    this.elements = elements;
-    this.extendList = extendList;
-    this.condition = condition;
-    this.currentFileInfo = currentFileInfo || {};
-    this.isReferenced = isReferenced;
-    if (!condition) {
-        this.evaldCondition = true;
-    }
-};
-tree.Selector.prototype = {
-    type: "Selector",
-    accept: function (visitor) {
-        if (this.elements) {
-            this.elements = visitor.visitArray(this.elements);
-        }
-        if (this.extendList) {
-            this.extendList = visitor.visitArray(this.extendList);
-        }
-        if (this.condition) {
-            this.condition = visitor.visit(this.condition);
-        }
-    },
-    createDerived: function(elements, extendList, evaldCondition) {
-        evaldCondition = (evaldCondition != null) ? evaldCondition : this.evaldCondition;
-        var newSelector = new(tree.Selector)(elements, extendList || this.extendList, null, this.index, this.currentFileInfo, this.isReferenced);
-        newSelector.evaldCondition = evaldCondition;
-        newSelector.mediaEmpty = this.mediaEmpty;
-        return newSelector;
-    },
-    match: function (other) {
-        var elements = this.elements,
-            len = elements.length,
-            olen, i;
-
-        other.CacheElements();
-
-        olen = other._elements.length;
-        if (olen === 0 || len < olen) {
-            return 0;
-        } else {
-            for (i = 0; i < olen; i++) {
-                if (elements[i].value !== other._elements[i]) {
-                    return 0;
-                }
-            }
-        }
-
-        return olen; // return number of matched elements
-    },
-    CacheElements: function(){
-        var css = '', len, v, i;
-
-        if( !this._elements ){
-
-            len = this.elements.length;
-            for(i = 0; i < len; i++){
-
-                v = this.elements[i];
-                css += v.combinator.value;
-
-                if( !v.value.value ){
-                    css += v.value;
-                    continue;
-                }
-
-                if( typeof v.value.value !== "string" ){
-                    css = '';
-                    break;
-                }
-                css += v.value.value;
-            }
-
-            this._elements = css.match(/[,&#\*\.\w-]([\w-]|(\\.))*/g);
-
-            if (this._elements) {
-                if (this._elements[0] === "&") {
-                    this._elements.shift();
-                }
-
-            } else {
-                this._elements = [];
-            }
-
-        }
-    },
-    isJustParentSelector: function() {
-        return !this.mediaEmpty &&
-            this.elements.length === 1 &&
-            this.elements[0].value === '&' &&
-            (this.elements[0].combinator.value === ' ' || this.elements[0].combinator.value === '');
-    },
-    eval: function (env) {
-        var evaldCondition = this.condition && this.condition.eval(env),
-            elements = this.elements, extendList = this.extendList;
-
-        elements = elements && elements.map(function (e) { return e.eval(env); });
-        extendList = extendList && extendList.map(function(extend) { return extend.eval(env); });
-
-        return this.createDerived(elements, extendList, evaldCondition);
-    },
-    genCSS: function (env, output) {
-        var i, element;
-        if ((!env || !env.firstSelector) && this.elements[0].combinator.value === "") {
-            output.add(' ', this.currentFileInfo, this.index);
-        }
-        if (!this._css) {
-            //TODO caching? speed comparison?
-            for(i = 0; i < this.elements.length; i++) {
-                element = this.elements[i];
-                element.genCSS(env, output);
-            }
-        }
-    },
-    toCSS: tree.toCSS,
-    markReferenced: function () {
-        this.isReferenced = true;
-    },
-    getIsReferenced: function() {
-        return !this.currentFileInfo.reference || this.isReferenced;
-    },
-    getIsOutput: function() {
-        return this.evaldCondition;
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.UnicodeDescriptor = function (value) {
-    this.value = value;
-};
-tree.UnicodeDescriptor.prototype = {
-    type: "UnicodeDescriptor",
-    genCSS: function (env, output) {
-        output.add(this.value);
-    },
-    toCSS: tree.toCSS,
-    eval: function () { return this; }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.URL = function (val, currentFileInfo, isEvald) {
-    this.value = val;
-    this.currentFileInfo = currentFileInfo;
-    this.isEvald = isEvald;
-};
-tree.URL.prototype = {
-    type: "Url",
-    accept: function (visitor) {
-        this.value = visitor.visit(this.value);
-    },
-    genCSS: function (env, output) {
-        output.add("url(");
-        this.value.genCSS(env, output);
-        output.add(")");
-    },
-    toCSS: tree.toCSS,
-    eval: function (ctx) {
-        var val = this.value.eval(ctx),
-            rootpath;
-
-        if (!this.isEvald) {
-            // Add the base path if the URL is relative
-            rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
-            if (rootpath && typeof val.value === "string" && ctx.isPathRelative(val.value)) {
-                if (!val.quote) {
-                    rootpath = rootpath.replace(/[\(\)'"\s]/g, function(match) { return "\\"+match; });
-                }
-                val.value = rootpath + val.value;
-            }
-
-            val.value = ctx.normalizePath(val.value);
-
-            // Add url args if enabled
-            if (ctx.urlArgs) {
-                if (!val.value.match(/^\s*data:/)) {
-                    var delimiter = val.value.indexOf('?') === -1 ? '?' : '&';
-                    var urlArgs = delimiter + ctx.urlArgs;
-                    if (val.value.indexOf('#') !== -1) {
-                        val.value = val.value.replace('#', urlArgs + '#');
-                    } else {
-                        val.value += urlArgs;
-                    }
-                }
-            }
-        }
-
-        return new(tree.URL)(val, this.currentFileInfo, true);
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Value = function (value) {
-    this.value = value;
-};
-tree.Value.prototype = {
-    type: "Value",
-    accept: function (visitor) {
-        if (this.value) {
-            this.value = visitor.visitArray(this.value);
-        }
-    },
-    eval: function (env) {
-        if (this.value.length === 1) {
-            return this.value[0].eval(env);
-        } else {
-            return new(tree.Value)(this.value.map(function (v) {
-                return v.eval(env);
-            }));
-        }
-    },
-    genCSS: function (env, output) {
-        var i;
-        for(i = 0; i < this.value.length; i++) {
-            this.value[i].genCSS(env, output);
-            if (i+1 < this.value.length) {
-                output.add((env && env.compress) ? ',' : ', ');
-            }
-        }
-    },
-    toCSS: tree.toCSS
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-tree.Variable = function (name, index, currentFileInfo) {
-    this.name = name;
-    this.index = index;
-    this.currentFileInfo = currentFileInfo || {};
-};
-tree.Variable.prototype = {
-    type: "Variable",
-    eval: function (env) {
-        var variable, name = this.name;
-
-        if (name.indexOf('@@') === 0) {
-            name = '@' + new(tree.Variable)(name.slice(1)).eval(env).value;
-        }
-
-        if (this.evaluating) {
-            throw { type: 'Name',
-                    message: "Recursive variable definition for " + name,
-                    filename: this.currentFileInfo.file,
-                    index: this.index };
-        }
-
-        this.evaluating = true;
-
-        variable = tree.find(env.frames, function (frame) {
-            var v = frame.variable(name);
-            if (v) {
-                return v.value.eval(env);
-            }
-        });
-        if (variable) {
-            this.evaluating = false;
-            return variable;
-        } else {
-            throw { type: 'Name',
-                    message: "variable " + name + " is undefined",
-                    filename: this.currentFileInfo.filename,
-                    index: this.index };
-        }
-    }
-};
-
-})(require('../tree'));
-
-(function (tree) {
-
-    var parseCopyProperties = [
-        'paths',            // option - unmodified - paths to search for imports on
-        'optimization',     // option - optimization level (for the chunker)
-        'files',            // list of files that have been imported, used for import-once
-        'contents',         // map - filename to contents of all the files
-        'contentsIgnoredChars', // map - filename to lines at the begining of each file to ignore
-        'relativeUrls',     // option - whether to adjust URL's to be relative
-        'rootpath',         // option - rootpath to append to URL's
-        'strictImports',    // option -
-        'insecure',         // option - whether to allow imports from insecure ssl hosts
-        'dumpLineNumbers',  // option - whether to dump line numbers
-        'compress',         // option - whether to compress
-        'processImports',   // option - whether to process imports. if false then imports will not be imported
-        'syncImport',       // option - whether to import synchronously
-        'javascriptEnabled',// option - whether JavaScript is enabled. if undefined, defaults to true
-        'mime',             // browser only - mime type for sheet import
-        'useFileCache',     // browser only - whether to use the per file session cache
-        'currentFileInfo'   // information about the current file - for error reporting and importing and making urls relative etc.
-    ];
-
-    //currentFileInfo = {
-    //  'relativeUrls' - option - whether to adjust URL's to be relative
-    //  'filename' - full resolved filename of current file
-    //  'rootpath' - path to append to normal URLs for this node
-    //  'currentDirectory' - path to the current file, absolute
-    //  'rootFilename' - filename of the base file
-    //  'entryPath' - absolute path to the entry file
-    //  'reference' - whether the file should not be output and only output parts that are referenced
-
-    tree.parseEnv = function(options) {
-        copyFromOriginal(options, this, parseCopyProperties);
-
-        if (!this.contents) { this.contents = {}; }
-        if (!this.contentsIgnoredChars) { this.contentsIgnoredChars = {}; }
-        if (!this.files) { this.files = {}; }
-
-        if (typeof this.paths === "string") { this.paths = [this.paths]; }
-
-        if (!this.currentFileInfo) {
-            var filename = (options && options.filename) || "input";
-            var entryPath = filename.replace(/[^\/\\]*$/, "");
-            if (options) {
-                options.filename = null;
-            }
-            this.currentFileInfo = {
-                filename: filename,
-                relativeUrls: this.relativeUrls,
-                rootpath: (options && options.rootpath) || "",
-                currentDirectory: entryPath,
-                entryPath: entryPath,
-                rootFilename: filename
-            };
-        }
-    };
-
-    var evalCopyProperties = [
-        'silent',         // whether to swallow errors and warnings
-        'verbose',        // whether to log more activity
-        'compress',       // whether to compress
-        'yuicompress',    // whether to compress with the outside tool yui compressor
-        'ieCompat',       // whether to enforce IE compatibility (IE8 data-uri)
-        'strictMath',     // whether math has to be within parenthesis
-        'strictUnits',    // whether units need to evaluate correctly
-        'cleancss',       // whether to compress with clean-css
-        'sourceMap',      // whether to output a source map
-        'importMultiple', // whether we are currently importing multiple copies
-        'urlArgs'         // whether to add args into url tokens
-        ];
-
-    tree.evalEnv = function(options, frames) {
-        copyFromOriginal(options, this, evalCopyProperties);
-
-        this.frames = frames || [];
-    };
-
-    tree.evalEnv.prototype.inParenthesis = function () {
-        if (!this.parensStack) {
-            this.parensStack = [];
-        }
-        this.parensStack.push(true);
-    };
-
-    tree.evalEnv.prototype.outOfParenthesis = function () {
-        this.parensStack.pop();
-    };
-
-    tree.evalEnv.prototype.isMathOn = function () {
-        return this.strictMath ? (this.parensStack && this.parensStack.length) : true;
-    };
-
-    tree.evalEnv.prototype.isPathRelative = function (path) {
-        return !/^(?:[a-z-]+:|\/)/.test(path);
-    };
-
-    tree.evalEnv.prototype.normalizePath = function( path ) {
-        var
-          segments = path.split("/").reverse(),
-          segment;
-
-        path = [];
-        while (segments.length !== 0 ) {
-            segment = segments.pop();
-            switch( segment ) {
-                case ".":
-                    break;
-                case "..":
-                    if ((path.length === 0) || (path[path.length - 1] === "..")) {
-                        path.push( segment );
-                    } else {
-                        path.pop();
-                    }
-                    break;
-                default:
-                    path.push( segment );
-                    break;
-            }
-        }
-
-        return path.join("/");
-    };
-
-    //todo - do the same for the toCSS env
-    //tree.toCSSEnv = function (options) {
-    //};
-
-    var copyFromOriginal = function(original, destination, propertiesToCopy) {
-        if (!original) { return; }
-
-        for(var i = 0; i < propertiesToCopy.length; i++) {
-            if (original.hasOwnProperty(propertiesToCopy[i])) {
-                destination[propertiesToCopy[i]] = original[propertiesToCopy[i]];
-            }
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    var _visitArgs = { visitDeeper: true },
-        _hasIndexed = false;
-
-    function _noop(node) {
-        return node;
-    }
-
-    function indexNodeTypes(parent, ticker) {
-        // add .typeIndex to tree node types for lookup table
-        var key, child;
-        for (key in parent) {
-            if (parent.hasOwnProperty(key)) {
-                child = parent[key];
-                switch (typeof child) {
-                    case "function":
-                        // ignore bound functions directly on tree which do not have a prototype
-                        // or aren't nodes
-                        if (child.prototype && child.prototype.type) {
-                            child.prototype.typeIndex = ticker++;
-                        }
-                        break;
-                    case "object":
-                        ticker = indexNodeTypes(child, ticker);
-                        break;
-                }
-            }
-        }
-        return ticker;
-    }
-
-    tree.visitor = function(implementation) {
-        this._implementation = implementation;
-        this._visitFnCache = [];
-
-        if (!_hasIndexed) {
-            indexNodeTypes(tree, 1);
-            _hasIndexed = true;
-        }
-    };
-
-    tree.visitor.prototype = {
-        visit: function(node) {
-            if (!node) {
-                return node;
-            }
-
-            var nodeTypeIndex = node.typeIndex;
-            if (!nodeTypeIndex) {
-                return node;
-            }
-
-            var visitFnCache = this._visitFnCache,
-                impl = this._implementation,
-                aryIndx = nodeTypeIndex << 1,
-                outAryIndex = aryIndx | 1,
-                func = visitFnCache[aryIndx],
-                funcOut = visitFnCache[outAryIndex],
-                visitArgs = _visitArgs,
-                fnName;
-
-            visitArgs.visitDeeper = true;
-
-            if (!func) {
-                fnName = "visit" + node.type;
-                func = impl[fnName] || _noop;
-                funcOut = impl[fnName + "Out"] || _noop;
-                visitFnCache[aryIndx] = func;
-                visitFnCache[outAryIndex] = funcOut;
-            }
-
-            if (func !== _noop) {
-                var newNode = func.call(impl, node, visitArgs);
-                if (impl.isReplacing) {
-                    node = newNode;
-                }
-            }
-
-            if (visitArgs.visitDeeper && node && node.accept) {
-                node.accept(this);
-            }
-
-            if (funcOut != _noop) {
-                funcOut.call(impl, node);
-            }
-
-            return node;
-        },
-        visitArray: function(nodes, nonReplacing) {
-            if (!nodes) {
-                return nodes;
-            }
-
-            var cnt = nodes.length, i;
-
-            // Non-replacing
-            if (nonReplacing || !this._implementation.isReplacing) {
-                for (i = 0; i < cnt; i++) {
-                    this.visit(nodes[i]);
-                }
-                return nodes;
-            }
-
-            // Replacing
-            var out = [];
-            for (i = 0; i < cnt; i++) {
-                var evald = this.visit(nodes[i]);
-                if (!evald.splice) {
-                    out.push(evald);
-                } else if (evald.length) {
-                    this.flatten(evald, out);
-                }
-            }
-            return out;
-        },
-        flatten: function(arr, out) {
-            if (!out) {
-                out = [];
-            }
-
-            var cnt, i, item,
-                nestedCnt, j, nestedItem;
-
-            for (i = 0, cnt = arr.length; i < cnt; i++) {
-                item = arr[i];
-                if (!item.splice) {
-                    out.push(item);
-                    continue;
-                }
-
-                for (j = 0, nestedCnt = item.length; j < nestedCnt; j++) {
-                    nestedItem = item[j];
-                    if (!nestedItem.splice) {
-                        out.push(nestedItem);
-                    } else if (nestedItem.length) {
-                        this.flatten(nestedItem, out);
-                    }
-                }
-            }
-
-            return out;
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.importVisitor = function(importer, finish, evalEnv, onceFileDetectionMap, recursionDetector) {
-        this._visitor = new tree.visitor(this);
-        this._importer = importer;
-        this._finish = finish;
-        this.env = evalEnv || new tree.evalEnv();
-        this.importCount = 0;
-        this.onceFileDetectionMap = onceFileDetectionMap || {};
-        this.recursionDetector = {};
-        if (recursionDetector) {
-            for(var fullFilename in recursionDetector) {
-                if (recursionDetector.hasOwnProperty(fullFilename)) {
-                    this.recursionDetector[fullFilename] = true;
-                }
-            }
-        }
-    };
-
-    tree.importVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            var error;
-            try {
-                // process the contents
-                this._visitor.visit(root);
-            }
-            catch(e) {
-                error = e;
-            }
-
-            this.isFinished = true;
-
-            if (this.importCount === 0) {
-                this._finish(error);
-            }
-        },
-        visitImport: function (importNode, visitArgs) {
-            var importVisitor = this,
-                evaldImportNode,
-                inlineCSS = importNode.options.inline;
-
-            if (!importNode.css || inlineCSS) {
-
-                try {
-                    evaldImportNode = importNode.evalForImport(this.env);
-                } catch(e){
-                    if (!e.filename) { e.index = importNode.index; e.filename = importNode.currentFileInfo.filename; }
-                    // attempt to eval properly and treat as css
-                    importNode.css = true;
-                    // if that fails, this error will be thrown
-                    importNode.error = e;
-                }
-
-                if (evaldImportNode && (!evaldImportNode.css || inlineCSS)) {
-                    importNode = evaldImportNode;
-                    this.importCount++;
-                    var env = new tree.evalEnv(this.env, this.env.frames.slice(0));
-
-                    if (importNode.options.multiple) {
-                        env.importMultiple = true;
-                    }
-
-                    this._importer.push(importNode.getPath(), importNode.currentFileInfo, importNode.options, function (e, root, importedAtRoot, fullPath) {
-                        if (e && !e.filename) {
-                            e.index = importNode.index; e.filename = importNode.currentFileInfo.filename;
-                        }
-
-                        var duplicateImport = importedAtRoot || fullPath in importVisitor.recursionDetector;
-                        if (!env.importMultiple) {
-                            if (duplicateImport) {
-                                importNode.skip = true;
-                            } else {
-                                importNode.skip = function() {
-                                    if (fullPath in importVisitor.onceFileDetectionMap) {
-                                        return true;
-                                    }
-                                    importVisitor.onceFileDetectionMap[fullPath] = true;
-                                    return false;
-                                };
-                            }
-                        }
-
-                        var subFinish = function(e) {
-                            importVisitor.importCount--;
-
-                            if (importVisitor.importCount === 0 && importVisitor.isFinished) {
-                                importVisitor._finish(e);
-                            }
-                        };
-
-                        if (root) {
-                            importNode.root = root;
-                            importNode.importedFilename = fullPath;
-
-                            if (!inlineCSS && (env.importMultiple || !duplicateImport)) {
-                                importVisitor.recursionDetector[fullPath] = true;
-                                new(tree.importVisitor)(importVisitor._importer, subFinish, env, importVisitor.onceFileDetectionMap, importVisitor.recursionDetector)
-                                    .run(root);
-                                return;
-                            }
-                        }
-
-                        subFinish();
-                    });
-                }
-            }
-            visitArgs.visitDeeper = false;
-            return importNode;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-            return ruleNode;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            this.env.frames.unshift(directiveNode);
-            return directiveNode;
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.env.frames.shift();
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            this.env.frames.unshift(mixinDefinitionNode);
-            return mixinDefinitionNode;
-        },
-        visitMixinDefinitionOut: function (mixinDefinitionNode) {
-            this.env.frames.shift();
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            this.env.frames.unshift(rulesetNode);
-            return rulesetNode;
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.env.frames.shift();
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            this.env.frames.unshift(mediaNode.rules[0]);
-            return mediaNode;
-        },
-        visitMediaOut: function (mediaNode) {
-            this.env.frames.shift();
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.joinSelectorVisitor = function() {
-        this.contexts = [[]];
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.joinSelectorVisitor.prototype = {
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1],
-                paths = [], selectors;
-
-            this.contexts.push(paths);
-
-            if (! rulesetNode.root) {
-                selectors = rulesetNode.selectors;
-                if (selectors) {
-                    selectors = selectors.filter(function(selector) { return selector.getIsOutput(); });
-                    rulesetNode.selectors = selectors.length ? selectors : (selectors = null);
-                    if (selectors) { rulesetNode.joinSelectors(paths, context, selectors); }
-                }
-                if (!selectors) { rulesetNode.rules = null; }
-                rulesetNode.paths = paths;
-            }
-        },
-        visitRulesetOut: function (rulesetNode) {
-            this.contexts.length = this.contexts.length - 1;
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var context = this.contexts[this.contexts.length - 1];
-            mediaNode.rules[0].root = (context.length === 0 || context[0].multiMedia);
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    tree.toCSSVisitor = function(env) {
-        this._visitor = new tree.visitor(this);
-        this._env = env;
-    };
-
-    tree.toCSSVisitor.prototype = {
-        isReplacing: true,
-        run: function (root) {
-            return this._visitor.visit(root);
-        },
-
-        visitRule: function (ruleNode, visitArgs) {
-            if (ruleNode.variable) {
-                return [];
-            }
-            return ruleNode;
-        },
-
-        visitMixinDefinition: function (mixinNode, visitArgs) {
-            // mixin definitions do not get eval'd - this means they keep state
-            // so we have to clear that state here so it isn't used if toCSS is called twice
-            mixinNode.frames = [];
-            return [];
-        },
-
-        visitExtend: function (extendNode, visitArgs) {
-            return [];
-        },
-
-        visitComment: function (commentNode, visitArgs) {
-            if (commentNode.isSilent(this._env)) {
-                return [];
-            }
-            return commentNode;
-        },
-
-        visitMedia: function(mediaNode, visitArgs) {
-            mediaNode.accept(this._visitor);
-            visitArgs.visitDeeper = false;
-
-            if (!mediaNode.rules.length) {
-                return [];
-            }
-            return mediaNode;
-        },
-
-        visitDirective: function(directiveNode, visitArgs) {
-            if (directiveNode.currentFileInfo.reference && !directiveNode.isReferenced) {
-                return [];
-            }
-            if (directiveNode.name === "@charset") {
-                // Only output the debug info together with subsequent @charset definitions
-                // a comment (or @media statement) before the actual @charset directive would
-                // be considered illegal css as it has to be on the first line
-                if (this.charset) {
-                    if (directiveNode.debugInfo) {
-                        var comment = new tree.Comment("/* " + directiveNode.toCSS(this._env).replace(/\n/g, "")+" */\n");
-                        comment.debugInfo = directiveNode.debugInfo;
-                        return this._visitor.visit(comment);
-                    }
-                    return [];
-                }
-                this.charset = true;
-            }
-            if (directiveNode.rules && directiveNode.rules.rules) {
-                this._mergeRules(directiveNode.rules.rules);
-            }
-            return directiveNode;
-        },
-
-        checkPropertiesInRoot: function(rules) {
-            var ruleNode;
-            for(var i = 0; i < rules.length; i++) {
-                ruleNode = rules[i];
-                if (ruleNode instanceof tree.Rule && !ruleNode.variable) {
-                    throw { message: "properties must be inside selector blocks, they cannot be in the root.",
-                        index: ruleNode.index, filename: ruleNode.currentFileInfo ? ruleNode.currentFileInfo.filename : null};
-                }
-            }
-        },
-
-        visitRuleset: function (rulesetNode, visitArgs) {
-            var rule, rulesets = [];
-            if (rulesetNode.firstRoot) {
-                this.checkPropertiesInRoot(rulesetNode.rules);
-            }
-            if (! rulesetNode.root) {
-                if (rulesetNode.paths) {
-                    rulesetNode.paths = rulesetNode.paths
-                        .filter(function(p) {
-                            var i;
-                            if (p[0].elements[0].combinator.value === ' ') {
-                                p[0].elements[0].combinator = new(tree.Combinator)('');
-                            }
-                            for(i = 0; i < p.length; i++) {
-                                if (p[i].getIsReferenced() && p[i].getIsOutput()) {
-                                    return true;
-                                }
-                            }
-                            return false;
-                        });
-                }
-
-                // Compile rules and rulesets
-                var nodeRules = rulesetNode.rules, nodeRuleCnt = nodeRules ? nodeRules.length : 0;
-                for (var i = 0; i < nodeRuleCnt; ) {
-                    rule = nodeRules[i];
-                    if (rule && rule.rules) {
-                        // visit because we are moving them out from being a child
-                        rulesets.push(this._visitor.visit(rule));
-                        nodeRules.splice(i, 1);
-                        nodeRuleCnt--;
-                        continue;
-                    }
-                    i++;
-                }
-                // accept the visitor to remove rules and refactor itself
-                // then we can decide now whether we want it or not
-                if (nodeRuleCnt > 0) {
-                    rulesetNode.accept(this._visitor);
-                } else {
-                    rulesetNode.rules = null;
-                }
-                visitArgs.visitDeeper = false;
-
-                nodeRules = rulesetNode.rules;
-                if (nodeRules) {
-                    this._mergeRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-                if (nodeRules) {
-                    this._removeDuplicateRules(nodeRules);
-                    nodeRules = rulesetNode.rules;
-                }
-
-                // now decide whether we keep the ruleset
-                if (nodeRules && nodeRules.length > 0 && rulesetNode.paths.length > 0) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            } else {
-                rulesetNode.accept(this._visitor);
-                visitArgs.visitDeeper = false;
-                if (rulesetNode.firstRoot || (rulesetNode.rules && rulesetNode.rules.length > 0)) {
-                    rulesets.splice(0, 0, rulesetNode);
-                }
-            }
-            if (rulesets.length === 1) {
-                return rulesets[0];
-            }
-            return rulesets;
-        },
-
-        _removeDuplicateRules: function(rules) {
-            if (!rules) { return; }
-
-            // remove duplicates
-            var ruleCache = {},
-                ruleList, rule, i;
-
-            for(i = rules.length - 1; i >= 0 ; i--) {
-                rule = rules[i];
-                if (rule instanceof tree.Rule) {
-                    if (!ruleCache[rule.name]) {
-                        ruleCache[rule.name] = rule;
-                    } else {
-                        ruleList = ruleCache[rule.name];
-                        if (ruleList instanceof tree.Rule) {
-                            ruleList = ruleCache[rule.name] = [ruleCache[rule.name].toCSS(this._env)];
-                        }
-                        var ruleCSS = rule.toCSS(this._env);
-                        if (ruleList.indexOf(ruleCSS) !== -1) {
-                            rules.splice(i, 1);
-                        } else {
-                            ruleList.push(ruleCSS);
-                        }
-                    }
-                }
-            }
-        },
-
-        _mergeRules: function (rules) {
-            if (!rules) { return; }
-
-            var groups = {},
-                parts,
-                rule,
-                key;
-
-            for (var i = 0; i < rules.length; i++) {
-                rule = rules[i];
-
-                if ((rule instanceof tree.Rule) && rule.merge) {
-                    key = [rule.name,
-                        rule.important ? "!" : ""].join(",");
-
-                    if (!groups[key]) {
-                        groups[key] = [];
-                    } else {
-                        rules.splice(i--, 1);
-                    }
-
-                    groups[key].push(rule);
-                }
-            }
-
-            Object.keys(groups).map(function (k) {
-
-                function toExpression(values) {
-                    return new (tree.Expression)(values.map(function (p) {
-                        return p.value;
-                    }));
-                }
-
-                function toValue(values) {
-                    return new (tree.Value)(values.map(function (p) {
-                        return p;
-                    }));
-                }
-
-                parts = groups[k];
-
-                if (parts.length > 1) {
-                    rule = parts[0];
-                    var spacedGroups = [];
-                    var lastSpacedGroup = [];
-                    parts.map(function (p) {
-                    if (p.merge==="+") {
-                        if (lastSpacedGroup.length > 0) {
-                                spacedGroups.push(toExpression(lastSpacedGroup));
-                            }
-                            lastSpacedGroup = [];
-                        }
-                        lastSpacedGroup.push(p);
-                    });
-                    spacedGroups.push(toExpression(lastSpacedGroup));
-                    rule.value = toValue(spacedGroups);
-                }
-            });
-        }
-    };
-
-})(require('./tree'));
-(function (tree) {
-    /*jshint loopfunc:true */
-
-    tree.extendFinderVisitor = function() {
-        this._visitor = new tree.visitor(this);
-        this.contexts = [];
-        this.allExtendsStack = [[]];
-    };
-
-    tree.extendFinderVisitor.prototype = {
-        run: function (root) {
-            root = this._visitor.visit(root);
-            root.allExtends = this.allExtendsStack[0];
-            return root;
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-
-            var i, j, extend, allSelectorsExtendList = [], extendList;
-
-            // get &:extend(.a); rules which apply to all selectors in this ruleset
-            var rules = rulesetNode.rules, ruleCnt = rules ? rules.length : 0;
-            for(i = 0; i < ruleCnt; i++) {
-                if (rulesetNode.rules[i] instanceof tree.Extend) {
-                    allSelectorsExtendList.push(rules[i]);
-                    rulesetNode.extendOnEveryPath = true;
-                }
-            }
-
-            // now find every selector and apply the extends that apply to all extends
-            // and the ones which apply to an individual extend
-            var paths = rulesetNode.paths;
-            for(i = 0; i < paths.length; i++) {
-                var selectorPath = paths[i],
-                    selector = selectorPath[selectorPath.length - 1],
-                    selExtendList = selector.extendList;
-
-                extendList = selExtendList ? selExtendList.slice(0).concat(allSelectorsExtendList)
-                                           : allSelectorsExtendList;
-
-                if (extendList) {
-                    extendList = extendList.map(function(allSelectorsExtend) {
-                        return allSelectorsExtend.clone();
-                    });
-                }
-
-                for(j = 0; j < extendList.length; j++) {
-                    this.foundExtends = true;
-                    extend = extendList[j];
-                    extend.findSelfSelectors(selectorPath);
-                    extend.ruleset = rulesetNode;
-                    if (j === 0) { extend.firstExtendOnThisSelectorPath = true; }
-                    this.allExtendsStack[this.allExtendsStack.length-1].push(extend);
-                }
-            }
-
-            this.contexts.push(rulesetNode.selectors);
-        },
-        visitRulesetOut: function (rulesetNode) {
-            if (!rulesetNode.root) {
-                this.contexts.length = this.contexts.length - 1;
-            }
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            mediaNode.allExtends = [];
-            this.allExtendsStack.push(mediaNode.allExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            directiveNode.allExtends = [];
-            this.allExtendsStack.push(directiveNode.allExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-    tree.processExtendsVisitor = function() {
-        this._visitor = new tree.visitor(this);
-    };
-
-    tree.processExtendsVisitor.prototype = {
-        run: function(root) {
-            var extendFinder = new tree.extendFinderVisitor();
-            extendFinder.run(root);
-            if (!extendFinder.foundExtends) { return root; }
-            root.allExtends = root.allExtends.concat(this.doExtendChaining(root.allExtends, root.allExtends));
-            this.allExtendsStack = [root.allExtends];
-            return this._visitor.visit(root);
-        },
-        doExtendChaining: function (extendsList, extendsListTarget, iterationCount) {
-            //
-            // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering and pasting
-            // the selector we would do normally, but we are also adding an extend with the same target selector
-            // this means this new extend can then go and alter other extends
-            //
-            // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors
-            // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already processed if
-            // we look at each selector at a time, as is done in visitRuleset
-
-            var extendIndex, targetExtendIndex, matches, extendsToAdd = [], newSelector, extendVisitor = this, selectorPath, extend, targetExtend, newExtend;
-
-            iterationCount = iterationCount || 0;
-
-            //loop through comparing every extend with every target extend.
-            // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place
-            // e.g.  .a:extend(.b) {}  and .b:extend(.c) {} then the first extend extends the second one
-            // and the second is the target.
-            // the seperation into two lists allows us to process a subset of chains with a bigger set, as is the
-            // case when processing media queries
-            for(extendIndex = 0; extendIndex < extendsList.length; extendIndex++){
-                for(targetExtendIndex = 0; targetExtendIndex < extendsListTarget.length; targetExtendIndex++){
-
-                    extend = extendsList[extendIndex];
-                    targetExtend = extendsListTarget[targetExtendIndex];
-
-                    // look for circular references
-                    if( extend.parent_ids.indexOf( targetExtend.object_id ) >= 0 ){ continue; }
-
-                    // find a match in the target extends self selector (the bit before :extend)
-                    selectorPath = [targetExtend.selfSelectors[0]];
-                    matches = extendVisitor.findMatch(extend, selectorPath);
-
-                    if (matches.length) {
-
-                        // we found a match, so for each self selector..
-                        extend.selfSelectors.forEach(function(selfSelector) {
-
-                            // process the extend as usual
-                            newSelector = extendVisitor.extendSelector(matches, selectorPath, selfSelector);
-
-                            // but now we create a new extend from it
-                            newExtend = new(tree.Extend)(targetExtend.selector, targetExtend.option, 0);
-                            newExtend.selfSelectors = newSelector;
-
-                            // add the extend onto the list of extends for that selector
-                            newSelector[newSelector.length-1].extendList = [newExtend];
-
-                            // record that we need to add it.
-                            extendsToAdd.push(newExtend);
-                            newExtend.ruleset = targetExtend.ruleset;
-
-                            //remember its parents for circular references
-                            newExtend.parent_ids = newExtend.parent_ids.concat(targetExtend.parent_ids, extend.parent_ids);
-
-                            // only process the selector once.. if we have :extend(.a,.b) then multiple
-                            // extends will look at the same selector path, so when extending
-                            // we know that any others will be duplicates in terms of what is added to the css
-                            if (targetExtend.firstExtendOnThisSelectorPath) {
-                                newExtend.firstExtendOnThisSelectorPath = true;
-                                targetExtend.ruleset.paths.push(newSelector);
-                            }
-                        });
-                    }
-                }
-            }
-
-            if (extendsToAdd.length) {
-                // try to detect circular references to stop a stack overflow.
-                // may no longer be needed.
-                this.extendChainCount++;
-                if (iterationCount > 100) {
-                    var selectorOne = "{unable to calculate}";
-                    var selectorTwo = "{unable to calculate}";
-                    try
-                    {
-                        selectorOne = extendsToAdd[0].selfSelectors[0].toCSS();
-                        selectorTwo = extendsToAdd[0].selector.toCSS();
-                    }
-                    catch(e) {}
-                    throw {message: "extend circular reference detected. One of the circular extends is currently:"+selectorOne+":extend(" + selectorTwo+")"};
-                }
-
-                // now process the new extends on the existing rules so that we can handle a extending b extending c ectending d extending e...
-                return extendsToAdd.concat(extendVisitor.doExtendChaining(extendsToAdd, extendsListTarget, iterationCount+1));
-            } else {
-                return extendsToAdd;
-            }
-        },
-        visitRule: function (ruleNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitSelector: function (selectorNode, visitArgs) {
-            visitArgs.visitDeeper = false;
-        },
-        visitRuleset: function (rulesetNode, visitArgs) {
-            if (rulesetNode.root) {
-                return;
-            }
-            var matches, pathIndex, extendIndex, allExtends = this.allExtendsStack[this.allExtendsStack.length-1], selectorsToAdd = [], extendVisitor = this, selectorPath;
-
-            // look at each selector path in the ruleset, find any extend matches and then copy, find and replace
-
-            for(extendIndex = 0; extendIndex < allExtends.length; extendIndex++) {
-                for(pathIndex = 0; pathIndex < rulesetNode.paths.length; pathIndex++) {
-                    selectorPath = rulesetNode.paths[pathIndex];
-
-                    // extending extends happens initially, before the main pass
-                    if (rulesetNode.extendOnEveryPath) { continue; }
-                    var extendList = selectorPath[selectorPath.length-1].extendList;
-                    if (extendList && extendList.length) { continue; }
-
-                    matches = this.findMatch(allExtends[extendIndex], selectorPath);
-
-                    if (matches.length) {
-
-                        allExtends[extendIndex].selfSelectors.forEach(function(selfSelector) {
-                            selectorsToAdd.push(extendVisitor.extendSelector(matches, selectorPath, selfSelector));
-                        });
-                    }
-                }
-            }
-            rulesetNode.paths = rulesetNode.paths.concat(selectorsToAdd);
-        },
-        findMatch: function (extend, haystackSelectorPath) {
-            //
-            // look through the haystack selector path to try and find the needle - extend.selector
-            // returns an array of selector matches that can then be replaced
-            //
-            var haystackSelectorIndex, hackstackSelector, hackstackElementIndex, haystackElement,
-                targetCombinator, i,
-                extendVisitor = this,
-                needleElements = extend.selector.elements,
-                potentialMatches = [], potentialMatch, matches = [];
-
-            // loop through the haystack elements
-            for(haystackSelectorIndex = 0; haystackSelectorIndex < haystackSelectorPath.length; haystackSelectorIndex++) {
-                hackstackSelector = haystackSelectorPath[haystackSelectorIndex];
-
-                for(hackstackElementIndex = 0; hackstackElementIndex < hackstackSelector.elements.length; hackstackElementIndex++) {
-
-                    haystackElement = hackstackSelector.elements[hackstackElementIndex];
-
-                    // if we allow elements before our match we can add a potential match every time. otherwise only at the first element.
-                    if (extend.allowBefore || (haystackSelectorIndex === 0 && hackstackElementIndex === 0)) {
-                        potentialMatches.push({pathIndex: haystackSelectorIndex, index: hackstackElementIndex, matched: 0, initialCombinator: haystackElement.combinator});
-                    }
-
-                    for(i = 0; i < potentialMatches.length; i++) {
-                        potentialMatch = potentialMatches[i];
-
-                        // selectors add " " onto the first element. When we use & it joins the selectors together, but if we don't
-                        // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to work out
-                        // what the resulting combinator will be
-                        targetCombinator = haystackElement.combinator.value;
-                        if (targetCombinator === '' && hackstackElementIndex === 0) {
-                            targetCombinator = ' ';
-                        }
-
-                        // if we don't match, null our match to indicate failure
-                        if (!extendVisitor.isElementValuesEqual(needleElements[potentialMatch.matched].value, haystackElement.value) ||
-                            (potentialMatch.matched > 0 && needleElements[potentialMatch.matched].combinator.value !== targetCombinator)) {
-                            potentialMatch = null;
-                        } else {
-                            potentialMatch.matched++;
-                        }
-
-                        // if we are still valid and have finished, test whether we have elements after and whether these are allowed
-                        if (potentialMatch) {
-                            potentialMatch.finished = potentialMatch.matched === needleElements.length;
-                            if (potentialMatch.finished &&
-                                (!extend.allowAfter && (hackstackElementIndex+1 < hackstackSelector.elements.length || haystackSelectorIndex+1 < haystackSelectorPath.length))) {
-                                potentialMatch = null;
-                            }
-                        }
-                        // if null we remove, if not, we are still valid, so either push as a valid match or continue
-                        if (potentialMatch) {
-                            if (potentialMatch.finished) {
-                                potentialMatch.length = needleElements.length;
-                                potentialMatch.endPathIndex = haystackSelectorIndex;
-                                potentialMatch.endPathElementIndex = hackstackElementIndex + 1; // index after end of match
-                                potentialMatches.length = 0; // we don't allow matches to overlap, so start matching again
-                                matches.push(potentialMatch);
-                            }
-                        } else {
-                            potentialMatches.splice(i, 1);
-                            i--;
-                        }
-                    }
-                }
-            }
-            return matches;
-        },
-        isElementValuesEqual: function(elementValue1, elementValue2) {
-            if (typeof elementValue1 === "string" || typeof elementValue2 === "string") {
-                return elementValue1 === elementValue2;
-            }
-            if (elementValue1 instanceof tree.Attribute) {
-                if (elementValue1.op !== elementValue2.op || elementValue1.key !== elementValue2.key) {
-                    return false;
-                }
-                if (!elementValue1.value || !elementValue2.value) {
-                    if (elementValue1.value || elementValue2.value) {
-                        return false;
-                    }
-                    return true;
-                }
-                elementValue1 = elementValue1.value.value || elementValue1.value;
-                elementValue2 = elementValue2.value.value || elementValue2.value;
-                return elementValue1 === elementValue2;
-            }
-            elementValue1 = elementValue1.value;
-            elementValue2 = elementValue2.value;
-            if (elementValue1 instanceof tree.Selector) {
-                if (!(elementValue2 instanceof tree.Selector) || elementValue1.elements.length !== elementValue2.elements.length) {
-                    return false;
-                }
-                for(var i = 0; i <elementValue1.elements.length; i++) {
-                    if (elementValue1.elements[i].combinator.value !== elementValue2.elements[i].combinator.value) {
-                        if (i !== 0 || (elementValue1.elements[i].combinator.value || ' ') !== (elementValue2.elements[i].combinator.value || ' ')) {
-                            return false;
-                        }
-                    }
-                    if (!this.isElementValuesEqual(elementValue1.elements[i].value, elementValue2.elements[i].value)) {
-                        return false;
-                    }
-                }
-                return true;
-            }
-            return false;
-        },
-        extendSelector:function (matches, selectorPath, replacementSelector) {
-
-            //for a set of matches, replace each match with the replacement selector
-
-            var currentSelectorPathIndex = 0,
-                currentSelectorPathElementIndex = 0,
-                path = [],
-                matchIndex,
-                selector,
-                firstElement,
-                match,
-                newElements;
-
-            for (matchIndex = 0; matchIndex < matches.length; matchIndex++) {
-                match = matches[matchIndex];
-                selector = selectorPath[match.pathIndex];
-                firstElement = new tree.Element(
-                    match.initialCombinator,
-                    replacementSelector.elements[0].value,
-                    replacementSelector.elements[0].index,
-                    replacementSelector.elements[0].currentFileInfo
-                );
-
-                if (match.pathIndex > currentSelectorPathIndex && currentSelectorPathElementIndex > 0) {
-                    path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-
-                newElements = selector.elements
-                    .slice(currentSelectorPathElementIndex, match.index)
-                    .concat([firstElement])
-                    .concat(replacementSelector.elements.slice(1));
-
-                if (currentSelectorPathIndex === match.pathIndex && matchIndex > 0) {
-                    path[path.length - 1].elements =
-                        path[path.length - 1].elements.concat(newElements);
-                } else {
-                    path = path.concat(selectorPath.slice(currentSelectorPathIndex, match.pathIndex));
-
-                    path.push(new tree.Selector(
-                        newElements
-                    ));
-                }
-                currentSelectorPathIndex = match.endPathIndex;
-                currentSelectorPathElementIndex = match.endPathElementIndex;
-                if (currentSelectorPathElementIndex >= selectorPath[currentSelectorPathIndex].elements.length) {
-                    currentSelectorPathElementIndex = 0;
-                    currentSelectorPathIndex++;
-                }
-            }
-
-            if (currentSelectorPathIndex < selectorPath.length && currentSelectorPathElementIndex > 0) {
-                path[path.length - 1].elements = path[path.length - 1].elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
-                currentSelectorPathIndex++;
-            }
-
-            path = path.concat(selectorPath.slice(currentSelectorPathIndex, selectorPath.length));
-
-            return path;
-        },
-        visitRulesetOut: function (rulesetNode) {
-        },
-        visitMedia: function (mediaNode, visitArgs) {
-            var newAllExtends = mediaNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, mediaNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitMediaOut: function (mediaNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        },
-        visitDirective: function (directiveNode, visitArgs) {
-            var newAllExtends = directiveNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length-1]);
-            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, directiveNode.allExtends));
-            this.allExtendsStack.push(newAllExtends);
-        },
-        visitDirectiveOut: function (directiveNode) {
-            this.allExtendsStack.length = this.allExtendsStack.length - 1;
-        }
-    };
-
-})(require('./tree'));
-
-(function (tree) {
-
-    tree.sourceMapOutput = function (options) {
-        this._css = [];
-        this._rootNode = options.rootNode;
-        this._writeSourceMap = options.writeSourceMap;
-        this._contentsMap = options.contentsMap;
-        this._contentsIgnoredCharsMap = options.contentsIgnoredCharsMap;
-        this._sourceMapFilename = options.sourceMapFilename;
-        this._outputFilename = options.outputFilename;
-        this._sourceMapURL = options.sourceMapURL;
-        if (options.sourceMapBasepath) {
-            this._sourceMapBasepath = options.sourceMapBasepath.replace(/\\/g, '/');
-        }
-        this._sourceMapRootpath = options.sourceMapRootpath;
-        this._outputSourceFiles = options.outputSourceFiles;
-        this._sourceMapGeneratorConstructor = options.sourceMapGenerator || require("source-map").SourceMapGenerator;
-
-        if (this._sourceMapRootpath && this._sourceMapRootpath.charAt(this._sourceMapRootpath.length-1) !== '/') {
-            this._sourceMapRootpath += '/';
-        }
-
-        this._lineNumber = 0;
-        this._column = 0;
-    };
-
-    tree.sourceMapOutput.prototype.normalizeFilename = function(filename) {
-        filename = filename.replace(/\\/g, '/');
-
-        if (this._sourceMapBasepath && filename.indexOf(this._sourceMapBasepath) === 0) {
-            filename = filename.substring(this._sourceMapBasepath.length);
-            if (filename.charAt(0) === '\\' || filename.charAt(0) === '/') {
-               filename = filename.substring(1);
-            }
-        }
-        return (this._sourceMapRootpath || "") + filename;
-    };
-
-    tree.sourceMapOutput.prototype.add = function(chunk, fileInfo, index, mapLines) {
-
-        //ignore adding empty strings
-        if (!chunk) {
-            return;
-        }
-
-        var lines,
-            sourceLines,
-            columns,
-            sourceColumns,
-            i;
-
-        if (fileInfo) {
-            var inputSource = this._contentsMap[fileInfo.filename];
-
-            // remove vars/banner added to the top of the file
-            if (this._contentsIgnoredCharsMap[fileInfo.filename]) {
-                // adjust the index
-                index -= this._contentsIgnoredCharsMap[fileInfo.filename];
-                if (index < 0) { index = 0; }
-                // adjust the source
-                inputSource = inputSource.slice(this._contentsIgnoredCharsMap[fileInfo.filename]);
-            }
-            inputSource = inputSource.substring(0, index);
-            sourceLines = inputSource.split("\n");
-            sourceColumns = sourceLines[sourceLines.length-1];
-        }
-
-        lines = chunk.split("\n");
-        columns = lines[lines.length-1];
-
-        if (fileInfo) {
-            if (!mapLines) {
-                this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + 1, column: this._column},
-                    original: { line: sourceLines.length, column: sourceColumns.length},
-                    source: this.normalizeFilename(fileInfo.filename)});
-            } else {
-                for(i = 0; i < lines.length; i++) {
-                    this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + i + 1, column: i === 0 ? this._column : 0},
-                        original: { line: sourceLines.length + i, column: i === 0 ? sourceColumns.length : 0},
-                        source: this.normalizeFilename(fileInfo.filename)});
-                }
-            }
-        }
-
-        if (lines.length === 1) {
-            this._column += columns.length;
-        } else {
-            this._lineNumber += lines.length - 1;
-            this._column = columns.length;
-        }
-
-        this._css.push(chunk);
-    };
-
-    tree.sourceMapOutput.prototype.isEmpty = function() {
-        return this._css.length === 0;
-    };
-
-    tree.sourceMapOutput.prototype.toCSS = function(env) {
-        this._sourceMapGenerator = new this._sourceMapGeneratorConstructor({ file: this._outputFilename, sourceRoot: null });
-
-        if (this._outputSourceFiles) {
-            for(var filename in this._contentsMap) {
-                if (this._contentsMap.hasOwnProperty(filename))
-                {
-                    var source = this._contentsMap[filename];
-                    if (this._contentsIgnoredCharsMap[filename]) {
-                        source = source.slice(this._contentsIgnoredCharsMap[filename]);
-                    }
-                    this._sourceMapGenerator.setSourceContent(this.normalizeFilename(filename), source);
-                }
-            }
-        }
-
-        this._rootNode.genCSS(env, this);
-
-        if (this._css.length > 0) {
-            var sourceMapURL,
-                sourceMapContent = JSON.stringify(this._sourceMapGenerator.toJSON());
-
-            if (this._sourceMapURL) {
-                sourceMapURL = this._sourceMapURL;
-            } else if (this._sourceMapFilename) {
-                sourceMapURL = this.normalizeFilename(this._sourceMapFilename);
-            }
-
-            if (this._writeSourceMap) {
-                this._writeSourceMap(sourceMapContent);
-            } else {
-                sourceMapURL = "data:application/json;base64," + require('./encoder.js').encodeBase64(sourceMapContent);
-            }
-
-            if (sourceMapURL) {
-                this._css.push("/*# sourceMappingURL=" + sourceMapURL + " */");
-            }
-        }
-
-        return this._css.join('');
-    };
-
-})(require('./tree'));
-
-//
-// browser.js - client-side engine
-//
-/*global less, window, document, XMLHttpRequest, location */
-
-var isFileProtocol = /^(file|chrome(-extension)?|resource|qrc|app):/.test(location.protocol);
-
-less.env = less.env || (location.hostname == '127.0.0.1' ||
-                        location.hostname == '0.0.0.0'   ||
-                        location.hostname == 'localhost' ||
-                        (location.port &&
-                          location.port.length > 0)      ||
-                        isFileProtocol                   ? 'development'
-                                                         : 'production');
-
-var logLevel = {
-    debug: 3,
-    info: 2,
-    errors: 1,
-    none: 0
-};
-
-// The amount of logging in the javascript console.
-// 3 - Debug, information and errors
-// 2 - Information and errors
-// 1 - Errors
-// 0 - None
-// Defaults to 2
-less.logLevel = typeof(less.logLevel) != 'undefined' ? less.logLevel : (less.env === 'development' ?  logLevel.debug : logLevel.errors);
-
-// Load styles asynchronously (default: false)
-//
-// This is set to `false` by default, so that the body
-// doesn't start loading before the stylesheets are parsed.
-// Setting this to `true` can result in flickering.
-//
-less.async = less.async || false;
-less.fileAsync = less.fileAsync || false;
-
-// Interval between watch polls
-less.poll = less.poll || (isFileProtocol ? 1000 : 1500);
-
-//Setup user functions
-if (less.functions) {
-    for(var func in less.functions) {
-        if (less.functions.hasOwnProperty(func)) {
-            less.tree.functions[func] = less.functions[func];
-        }
-   }
-}
-
-var dumpLineNumbers = /!dumpLineNumbers:(comments|mediaquery|all)/.exec(location.hash);
-if (dumpLineNumbers) {
-    less.dumpLineNumbers = dumpLineNumbers[1];
-}
-
-var typePattern = /^text\/(x-)?less$/;
-var cache = null;
-var fileCache = {};
-
-function log(str, level) {
-    if (typeof(console) !== 'undefined' && less.logLevel >= level) {
-        console.log('less: ' + str);
-    }
-}
-
-function extractId(href) {
-    return href.replace(/^[a-z-]+:\/+?[^\/]+/, '' )  // Remove protocol & domain
-        .replace(/^\//,                 '' )  // Remove root /
-        .replace(/\.[a-zA-Z]+$/,        '' )  // Remove simple extension
-        .replace(/[^\.\w-]+/g,          '-')  // Replace illegal characters
-        .replace(/\./g,                 ':'); // Replace dots with colons(for valid id)
-}
-
-function errorConsole(e, rootHref) {
-    var template = '{line} {content}';
-    var filename = e.filename || rootHref;
-    var errors = [];
-    var content = (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        " in " + filename + " ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':\n' +
-            errors.join('\n');
-    } else if (e.stack) {
-        content += e.stack;
-    }
-    log(content, logLevel.errors);
-}
-
-function createCSS(styles, sheet, lastModified) {
-    // Strip the query-string
-    var href = sheet.href || '';
-
-    // If there is no title set, use the filename, minus the extension
-    var id = 'less:' + (sheet.title || extractId(href));
-
-    // If this has already been inserted into the DOM, we may need to replace it
-    var oldCss = document.getElementById(id);
-    var keepOldCss = false;
-
-    // Create a new stylesheet node for insertion or (if necessary) replacement
-    var css = document.createElement('style');
-    css.setAttribute('type', 'text/css');
-    if (sheet.media) {
-        css.setAttribute('media', sheet.media);
-    }
-    css.id = id;
-
-    if (!css.styleSheet) {
-        css.appendChild(document.createTextNode(styles));
-
-        // If new contents match contents of oldCss, don't replace oldCss
-        keepOldCss = (oldCss !== null && oldCss.childNodes.length > 0 && css.childNodes.length > 0 &&
-            oldCss.firstChild.nodeValue === css.firstChild.nodeValue);
-    }
-
-    var head = document.getElementsByTagName('head')[0];
-
-    // If there is no oldCss, just append; otherwise, only append if we need
-    // to replace oldCss with an updated stylesheet
-    if (oldCss === null || keepOldCss === false) {
-        var nextEl = sheet && sheet.nextSibling || null;
-        if (nextEl) {
-            nextEl.parentNode.insertBefore(css, nextEl);
-        } else {
-            head.appendChild(css);
-        }
-    }
-    if (oldCss && keepOldCss === false) {
-        oldCss.parentNode.removeChild(oldCss);
-    }
-
-    // For IE.
-    // This needs to happen *after* the style element is added to the DOM, otherwise IE 7 and 8 may crash.
-    // See http://social.msdn.microsoft.com/Forums/en-US/7e081b65-878a-4c22-8e68-c10d39c2ed32/internet-explorer-crashes-appending-style-element-to-head
-    if (css.styleSheet) {
-        try {
-            css.styleSheet.cssText = styles;
-        } catch (e) {
-            throw new(Error)("Couldn't reassign styleSheet.cssText.");
-        }
-    }
-
-    // Don't update the local store if the file wasn't modified
-    if (lastModified && cache) {
-        log('saving ' + href + ' to cache.', logLevel.info);
-        try {
-            cache.setItem(href, styles);
-            cache.setItem(href + ':timestamp', lastModified);
-        } catch(e) {
-            //TODO - could do with adding more robust error handling
-            log('failed to save', logLevel.errors);
-        }
-    }
-}
-
-function postProcessCSS(styles) {
-    if (less.postProcessor && typeof less.postProcessor === 'function') {
-        styles = less.postProcessor.call(styles, styles) || styles;
-    }
-    return styles;
-}
-
-function errorHTML(e, rootHref) {
-    var id = 'less-error-message:' + extractId(rootHref || "");
-    var template = '<li><label>{line}</label><pre class="{class}">{content}</pre></li>';
-    var elem = document.createElement('div'), timer, content, errors = [];
-    var filename = e.filename || rootHref;
-    var filenameNoPath = filename.match(/([^\/]+(\?.*)?)$/)[1];
-
-    elem.id        = id;
-    elem.className = "less-error-message";
-
-    content = '<h3>'  + (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
-        '</h3>' + '<p>in <a href="' + filename   + '">' + filenameNoPath + "</a> ";
-
-    var errorline = function (e, i, classname) {
-        if (e.extract[i] !== undefined) {
-            errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
-                .replace(/\{class\}/, classname)
-                .replace(/\{content\}/, e.extract[i]));
-        }
-    };
-
-    if (e.extract) {
-        errorline(e, 0, '');
-        errorline(e, 1, 'line');
-        errorline(e, 2, '');
-        content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':</p>' +
-            '<ul>' + errors.join('') + '</ul>';
-    } else if (e.stack) {
-        content += '<br/>' + e.stack.split('\n').slice(1).join('<br/>');
-    }
-    elem.innerHTML = content;
-
-    // CSS for error messages
-    createCSS([
-        '.less-error-message ul, .less-error-message li {',
-        'list-style-type: none;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message label {',
-        'font-size: 12px;',
-        'margin-right: 15px;',
-        'padding: 4px 0;',
-        'color: #cc7777;',
-        '}',
-        '.less-error-message pre {',
-        'color: #dd6666;',
-        'padding: 4px 0;',
-        'margin: 0;',
-        'display: inline-block;',
-        '}',
-        '.less-error-message pre.line {',
-        'color: #ff0000;',
-        '}',
-        '.less-error-message h3 {',
-        'font-size: 20px;',
-        'font-weight: bold;',
-        'padding: 15px 0 5px 0;',
-        'margin: 0;',
-        '}',
-        '.less-error-message a {',
-        'color: #10a',
-        '}',
-        '.less-error-message .error {',
-        'color: red;',
-        'font-weight: bold;',
-        'padding-bottom: 2px;',
-        'border-bottom: 1px dashed red;',
-        '}'
-    ].join('\n'), { title: 'error-message' });
-
-    elem.style.cssText = [
-        "font-family: Arial, sans-serif",
-        "border: 1px solid #e00",
-        "background-color: #eee",
-        "border-radius: 5px",
-        "-webkit-border-radius: 5px",
-        "-moz-border-radius: 5px",
-        "color: #e00",
-        "padding: 15px",
-        "margin-bottom: 15px"
-    ].join(';');
-
-    if (less.env == 'development') {
-        timer = setInterval(function () {
-            if (document.body) {
-                if (document.getElementById(id)) {
-                    document.body.replaceChild(elem, document.getElementById(id));
-                } else {
-                    document.body.insertBefore(elem, document.body.firstChild);
-                }
-                clearInterval(timer);
-            }
-        }, 10);
-    }
-}
-
-function error(e, rootHref) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        errorHTML(e, rootHref);
-    } else if (less.errorReporting === "console") {
-        errorConsole(e, rootHref);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("add", e, rootHref);
-    }
-}
-
-function removeErrorHTML(path) {
-    var node = document.getElementById('less-error-message:' + extractId(path));
-    if (node) {
-        node.parentNode.removeChild(node);
-    }
-}
-
-function removeErrorConsole(path) {
-    //no action
-}
-
-function removeError(path) {
-    if (!less.errorReporting || less.errorReporting === "html") {
-        removeErrorHTML(path);
-    } else if (less.errorReporting === "console") {
-        removeErrorConsole(path);
-    } else if (typeof less.errorReporting === 'function') {
-        less.errorReporting("remove", path);
-    }
-}
-
-function loadStyles(modifyVars) {
-    var styles = document.getElementsByTagName('style'),
-        style;
-    for (var i = 0; i < styles.length; i++) {
-        style = styles[i];
-        if (style.type.match(typePattern)) {
-            var env = new less.tree.parseEnv(less),
-                lessText = style.innerHTML || '';
-            env.filename = document.location.href.replace(/#.*$/, '');
-
-            if (modifyVars || less.globalVars) {
-                env.useFileCache = true;
-            }
-
-            /*jshint loopfunc:true */
-            // use closure to store current value of i
-            var callback = (function(style) {
-                return function (e, cssAST) {
-                    if (e) {
-                        return error(e, "inline");
-                    }
-                    var css = cssAST.toCSS(less);
-                    style.type = 'text/css';
-                    if (style.styleSheet) {
-                        style.styleSheet.cssText = css;
-                    } else {
-                        style.innerHTML = css;
-                    }
-                };
-            })(style);
-            new(less.Parser)(env).parse(lessText, callback, {globalVars: less.globalVars, modifyVars: modifyVars});
-        }
-    }
-}
-
-function extractUrlParts(url, baseUrl) {
-    // urlParts[1] = protocol&hostname || /
-    // urlParts[2] = / if path relative to host base
-    // urlParts[3] = directories
-    // urlParts[4] = filename
-    // urlParts[5] = parameters
-
-    var urlPartsRegex = /^((?:[a-z-]+:)?\/+?(?:[^\/\?#]*\/)|([\/\\]))?((?:[^\/\\\?#]*[\/\\])*)([^\/\\\?#]*)([#\?].*)?$/i,
-        urlParts = url.match(urlPartsRegex),
-        returner = {}, directories = [], i, baseUrlParts;
-
-    if (!urlParts) {
-        throw new Error("Could not parse sheet href - '"+url+"'");
-    }
-
-    // Stylesheets in IE don't always return the full path
-    if (!urlParts[1] || urlParts[2]) {
-        baseUrlParts = baseUrl.match(urlPartsRegex);
-        if (!baseUrlParts) {
-            throw new Error("Could not parse page url - '"+baseUrl+"'");
-        }
-        urlParts[1] = urlParts[1] || baseUrlParts[1] || "";
-        if (!urlParts[2]) {
-            urlParts[3] = baseUrlParts[3] + urlParts[3];
-        }
-    }
-
-    if (urlParts[3]) {
-        directories = urlParts[3].replace(/\\/g, "/").split("/");
-
-        // extract out . before .. so .. doesn't absorb a non-directory
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".") {
-                directories.splice(i, 1);
-                i -= 1;
-            }
-        }
-
-        for(i = 0; i < directories.length; i++) {
-            if (directories[i] === ".." && i > 0) {
-                directories.splice(i-1, 2);
-                i -= 2;
-            }
-        }
-    }
-
-    returner.hostPart = urlParts[1];
-    returner.directories = directories;
-    returner.path = urlParts[1] + directories.join("/");
-    returner.fileUrl = returner.path + (urlParts[4] || "");
-    returner.url = returner.fileUrl + (urlParts[5] || "");
-    return returner;
-}
-
-function pathDiff(url, baseUrl) {
-    // diff between two paths to create a relative path
-
-    var urlParts = extractUrlParts(url),
-        baseUrlParts = extractUrlParts(baseUrl),
-        i, max, urlDirectories, baseUrlDirectories, diff = "";
-    if (urlParts.hostPart !== baseUrlParts.hostPart) {
-        return "";
-    }
-    max = Math.max(baseUrlParts.directories.length, urlParts.directories.length);
-    for(i = 0; i < max; i++) {
-        if (baseUrlParts.directories[i] !== urlParts.directories[i]) { break; }
-    }
-    baseUrlDirectories = baseUrlParts.directories.slice(i);
-    urlDirectories = urlParts.directories.slice(i);
-    for(i = 0; i < baseUrlDirectories.length-1; i++) {
-        diff += "../";
-    }
-    for(i = 0; i < urlDirectories.length-1; i++) {
-        diff += urlDirectories[i] + "/";
-    }
-    return diff;
-}
-
-function getXMLHttpRequest() {
-    if (window.XMLHttpRequest && (window.location.protocol !== "file:" || !("ActiveXObject" in window))) {
-        return new XMLHttpRequest();
-    } else {
-        try {
-            /*global ActiveXObject */
-            return new ActiveXObject("Microsoft.XMLHTTP");
-        } catch (e) {
-            log("browser doesn't support AJAX.", logLevel.errors);
-            return null;
-        }
-    }
-}
-
-function doXHR(url, type, callback, errback) {
-    var xhr = getXMLHttpRequest();
-    var async = isFileProtocol ? less.fileAsync : less.async;
-
-    if (typeof(xhr.overrideMimeType) === 'function') {
-        xhr.overrideMimeType('text/css');
-    }
-    log("XHR: Getting '" + url + "'", logLevel.debug);
-    xhr.open('GET', url, async);
-    xhr.setRequestHeader('Accept', type || 'text/x-less, text/css; q=0.9, */*; q=0.5');
-    xhr.send(null);
-
-    function handleResponse(xhr, callback, errback) {
-        if (xhr.status >= 200 && xhr.status < 300) {
-            callback(xhr.responseText,
-                xhr.getResponseHeader("Last-Modified"));
-        } else if (typeof(errback) === 'function') {
-            errback(xhr.status, url);
-        }
-    }
-
-    if (isFileProtocol && !less.fileAsync) {
-        if (xhr.status === 0 || (xhr.status >= 200 && xhr.status < 300)) {
-            callback(xhr.responseText);
-        } else {
-            errback(xhr.status, url);
-        }
-    } else if (async) {
-        xhr.onreadystatechange = function () {
-            if (xhr.readyState == 4) {
-                handleResponse(xhr, callback, errback);
-            }
-        };
-    } else {
-        handleResponse(xhr, callback, errback);
-    }
-}
-
-function loadFile(originalHref, currentFileInfo, callback, env, modifyVars) {
-
-    if (currentFileInfo && currentFileInfo.currentDirectory && !/^([A-Za-z-]+:)?\//.test(originalHref)) {
-        originalHref = currentFileInfo.currentDirectory + originalHref;
-    }
-
-    // sheet may be set to the stylesheet for the initial load or a collection of properties including
-    // some env variables for imports
-    var hrefParts = extractUrlParts(originalHref, window.location.href);
-    var href      = hrefParts.url;
-    var newFileInfo = {
-        currentDirectory: hrefParts.path,
-        filename: href
-    };
-
-    if (currentFileInfo) {
-        newFileInfo.entryPath = currentFileInfo.entryPath;
-        newFileInfo.rootpath = currentFileInfo.rootpath;
-        newFileInfo.rootFilename = currentFileInfo.rootFilename;
-        newFileInfo.relativeUrls = currentFileInfo.relativeUrls;
-    } else {
-        newFileInfo.entryPath = hrefParts.path;
-        newFileInfo.rootpath = less.rootpath || hrefParts.path;
-        newFileInfo.rootFilename = href;
-        newFileInfo.relativeUrls = env.relativeUrls;
-    }
-
-    if (newFileInfo.relativeUrls) {
-        if (env.rootpath) {
-            newFileInfo.rootpath = extractUrlParts(env.rootpath + pathDiff(hrefParts.path, newFileInfo.entryPath)).path;
-        } else {
-            newFileInfo.rootpath = hrefParts.path;
-        }
-    }
-
-    if (env.useFileCache && fileCache[href]) {
-        try {
-            var lessText = fileCache[href];
-            callback(null, lessText, href, newFileInfo, { lastModified: new Date() });
-        } catch (e) {
-            callback(e, null, href);
-        }
-        return;
-    }
-
-    doXHR(href, env.mime, function (data, lastModified) {
-        // per file cache
-        fileCache[href] = data;
-
-        // Use remote copy (re-parse)
-        try {
-            callback(null, data, href, newFileInfo, { lastModified: lastModified });
-        } catch (e) {
-            callback(e, null, href);
-        }
-    }, function (status, url) {
-        callback({ type: 'File', message: "'" + url + "' wasn't found (" + status + ")" }, null, href);
-    });
-}
-
-function loadStyleSheet(sheet, callback, reload, remaining, modifyVars) {
-
-    var env = new less.tree.parseEnv(less);
-    env.mime = sheet.type;
-
-    if (modifyVars || less.globalVars) {
-        env.useFileCache = true;
-    }
-
-    loadFile(sheet.href, null, function(e, data, path, newFileInfo, webInfo) {
-
-        if (webInfo) {
-            webInfo.remaining = remaining;
-
-            var css       = cache && cache.getItem(path),
-                timestamp = cache && cache.getItem(path + ':timestamp');
-
-            if (!reload && timestamp && webInfo.lastModified &&
-                (new(Date)(webInfo.lastModified).valueOf() ===
-                    new(Date)(timestamp).valueOf())) {
-                // Use local copy
-                createCSS(css, sheet);
-                webInfo.local = true;
-                callback(null, null, data, sheet, webInfo, path);
-                return;
-            }
-        }
-
-        //TODO add tests around how this behaves when reloading
-        removeError(path);
-
-        if (data) {
-            env.currentFileInfo = newFileInfo;
-            new(less.Parser)(env).parse(data, function (e, root) {
-                if (e) { return callback(e, null, null, sheet); }
-                try {
-                    callback(e, root, data, sheet, webInfo, path);
-                } catch (e) {
-                    callback(e, null, null, sheet);
-                }
-            }, {modifyVars: modifyVars, globalVars: less.globalVars});
-        } else {
-            callback(e, null, null, sheet, webInfo, path);
-        }
-    }, env, modifyVars);
-}
-
-function loadStyleSheets(callback, reload, modifyVars) {
-    for (var i = 0; i < less.sheets.length; i++) {
-        loadStyleSheet(less.sheets[i], callback, reload, less.sheets.length - (i + 1), modifyVars);
-    }
-}
-
-function initRunningMode(){
-    if (less.env === 'development') {
-        less.optimization = 0;
-        less.watchTimer = setInterval(function () {
-            if (less.watchMode) {
-                loadStyleSheets(function (e, root, _, sheet, env) {
-                    if (e) {
-                        error(e, sheet.href);
-                    } else if (root) {
-                        var styles = root.toCSS(less);
-                        styles = postProcessCSS(styles);
-                        createCSS(styles, sheet, env.lastModified);
-                    }
-                });
-            }
-        }, less.poll);
-    } else {
-        less.optimization = 3;
-    }
-}
-
-
-
-//
-// Watch mode
-//
-less.watch   = function () {
-    if (!less.watchMode ){
-        less.env = 'development';
-         initRunningMode();
-    }
-    this.watchMode = true;
-    return true;
-};
-
-less.unwatch = function () {clearInterval(less.watchTimer); this.watchMode = false; return false; };
-
-if (/!watch/.test(location.hash)) {
-    less.watch();
-}
-
-if (less.env != 'development') {
-    try {
-        cache = (typeof(window.localStorage) === 'undefined') ? null : window.localStorage;
-    } catch (_) {}
-}
-
-//
-// Get all <link> tags with the 'rel' attribute set to "stylesheet/less"
-//
-var links = document.getElementsByTagName('link');
-
-less.sheets = [];
-
-for (var i = 0; i < links.length; i++) {
-    if (links[i].rel === 'stylesheet/less' || (links[i].rel.match(/stylesheet/) &&
-       (links[i].type.match(typePattern)))) {
-        less.sheets.push(links[i]);
-    }
-}
-
-//
-// With this function, it's possible to alter variables and re-render
-// CSS without reloading less-files
-//
-less.modifyVars = function(record) {
-    less.refresh(false, record);
-};
-
-less.refresh = function (reload, modifyVars) {
-    var startTime, endTime;
-    startTime = endTime = new Date();
-
-    loadStyleSheets(function (e, root, _, sheet, env) {
-        if (e) {
-            return error(e, sheet.href);
-        }
-        if (env.local) {
-            log("loading " + sheet.href + " from cache.", logLevel.info);
-        } else {
-            //log("parsed " + sheet.href + " successfully.", logLevel.debug);
-            //var styles = root.toCSS(less);
-            //styles = postProcessCSS(styles);
-            //createCSS(styles, sheet, env.lastModified);
-
-
-            // less.php changes
-            var css = root.toCSS(less);
-            function totextarea(){
-                var textarea = document.getElementById('lessjs_textarea');
-                if( textarea ){
-                    textarea.value = css;
-                    diffUsingJS(0);
-                }else{
-                    window.setTimeout(totextarea,300);
-                }
-            }
-            totextarea();
-
-        }
-        log("css for " + sheet.href + " generated in " + (new Date() - endTime) + 'ms', logLevel.info);
-        if (env.remaining === 0) {
-            log("less has finished. css generated in " + (new Date() - startTime) + 'ms', logLevel.info);
-        }
-        endTime = new Date();
-    }, reload, modifyVars);
-
-    loadStyles(modifyVars);
-};
-
-less.refreshStyles = loadStyles;
-
-less.Parser.fileLoader = loadFile;
-
-less.refresh(less.env === 'development');
-
-// amd.js
-//
-// Define Less as an AMD module.
-if (typeof define === "function" && define.amd) {
-    define(function () { return less; } );
-}
-
-})(window);