An Arrow Parsing Edge Case

[Kevin Smith]

> `yield` is a keyword inside `function*` whether you're in strict or
> non-strict code.
>

 Right, but not within the body of nested arrow functions:

    function* g() { () => { var yield; } }

IIUC, this would parse fine.  So I'm asking whether a "yield" in the token
stream for an arrow parameter list should be interpreted as a keyword or an
identifier when we do the rewind/transform dance.
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