ariya/esprima — pull request #209 by Constellation (2013-12-07 03:49:34+00:00)
Title: Allow YieldExpression in an argument of YieldExpression

The current latest draft (Rev 21) allow YieldExpression in an argument
of YieldExpression. e.g. `yield yield v`

https://code.google.com/p/esprima/issues/detail?id=476