commit ee15703e6c7d3c9804b90b1f6a2d9cb52244092a
author Daniel Ehrenberg <littledan@chromium.org> Wed Jul 19 15:29:55 2017
committer Commit Bot <commit-bot@chromium.org> Wed Jul 19 16:12:45 2017
tree d3d731b38bb5976871435841bbbc3c9dfa1c32a5
parent 2da7a9b1107d26e664c6a0efb8cbaa2a54267eaa

[parser] Prohibit async functions and generators in invalid contexts

Async functions and generator declarations are only permitted as
StatementListItems, not as ExpressionStatements, and therefore not
as the entire body of an if statement, etc. Previously, they were
incorrectly permitted. However, ChakraCore and SpiderMonkey seem
to ban them in this context, and the feature was introduced relatively
recently, so it is likely to be web-compatible to ship the prohibition.

This patch also unifies the error message wording of async functions
and generators to ordinary functions, explaining more clearly what
the issue is.

Bug: v8:4483
Cq-Include-Trybots: master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: I31ed7818d6ab3e7e325031bfabb933dbf4512143
Reviewed-on: https://chromium-review.googlesource.com/568979
Commit-Queue: Daniel Ehrenberg <littledan@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46770}