Comment #1 on issue 3617 by [email protected]: Supplementary characters are allowed as identifier names in ES6
https://code.google.com/p/v8/issues/detail?id=3617

The main blocker here is that unibrow, our unicode tables generator script, only supports BMP, so its tables don't support supplementary planes. Not sure how much work it is to solve that issue, and how much it would bloat up the unicode tables.

On a lighter note, U+1F4A9 is not allowed as identifier name anyways, so at least we are not missing out on much :)

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