LGTM

https://codereview.chromium.org/1315823002/diff/20001/src/preparser.h
File src/preparser.h (right):

https://codereview.chromium.org/1315823002/diff/20001/src/preparser.h#newcode2279
src/preparser.h:2279: } else if (allow_harmony_rest_parameters() &&
Check(Token::ELLIPSIS)) {
On 2015/08/25 13:18:18, wingo wrote:
On 2015/08/25 12:55:56, rossberg wrote:
> I wonder, does rest actually need special treatment here? Can't it
simply be
> parsed as spread in the else case below, and later be rewritten?

I think it does need special treatment.  All the other places that
parse spread
(array literals, call arguments, comma expressions) parse spread
specially.  We
could of course parse it anywhere as a prefix unary op, marking the
production
invalid as an expression, but that is a riskier change if we are
considering
uplifting this to M46.  WDYT?

SGTM. Let's leave that as a clean-up for a separate CL.

https://codereview.chromium.org/1315823002/

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