Buildability

[edsko]

I wanted to experiment with the desugarer, trying to understand the paper ("The Essence of JavaScript") so I spent a bit of time making it buildable. For the record, here's what eventually worked:

1. ghc-7.0.4
2. language-ecmascript ==0.10 constraint in LambdaJS.cabal
3. Patched language-ecmascript-0.10 to remove spurious hiding clauses in src/language/ECMAScript3/Syntax/Arbitrary.hs

That said, once I finally got it building, the output from the desugarer is not very human friendly :(

Anyway, just reporting here in case it's useful to anyone.