Describe the bug

At a couple of places during parsing, we need to skip ahead to figure out what to feed Acorn — inside read_pattern, and as of #12070 inside snippets using a separate mechanism. The logic fails if characters like { appear inside strings, comments or regular expressions and are not balanced:

<!-- ok -->
{#each x as { y = 'z' }}{/each}

<!-- not ok -->
{#each x as { y = '{' }}{/each}

Reproduction

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Logs

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System Info

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Severity

annoyance