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Now that you say it, and I think about it more, I guess you're right. It does add features like list comprehension and pattern matching, and the compilation really is ambiguous.

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Coffeescript doesn't add pattern matching.

Coffeescript has it, though it's formally called destructuring: http://jashkenas.github.com/coffee-script/#destructuring

Ahem. That'd be "destructuring".

http://wiki.ecmascript.org/doku.php?id=harmony:destructuring

destructuring assignment is not really pattern matching, as the latter allows flow control and the former does not.

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