member access to `in` member and division about acorn HOT 4 CLOSED

Ah, that was broken because in is usually an operator and thus a slash after it is a regexp (instanceof will have behaved the same). I've added the code to handle this specially.

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Not sure where the testing of acorn is happening, so I didn't immediately validate these, but wanted to point out a couple of other possible issues (which I discovered while fixing this same bug in literalizer):

a . in /a/g;         // should be a.in / a / g, with divisions, not a regex
4. in /a/g;          // should be 4. in /a/g, with 4. being a number literal, the in operator, then a regex

Note: the syntax highlighter here in github is broken for that first example, because it thinks /a/g is a regex. :)

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@getify: I just confirmed that those parse correctly.

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thanks. :)

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