Function declarations were previously permitted by V8 in many locations
which no ECMAScript specification allowed; the ECMAScript 2015 spec
enumerates a few locations (in blocks, as well as after labels and in
conditionals when in sloppy mode). This patch ships the flag to restrict
the usage of function declarations to those contexts.
R=adamk
LOG=Y
BUG=v8:4824
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
Review URL: https://codereview.chromium.org/1799233003
Cr-Commit-Position: refs/heads/master@{#34828}
This patch fixes an obscure edge case for functions defined as the
direct body of a for-of/for-in loop, such as the following:
for (foo in []) function foo() { return foo; }
Here, the first occurrence of foo should point to the outer scope;
however, before this patch, it pointed to the inner foo in an
invalid way which caused an assertion about the scope chain to fail.
This patch fixes the scope chain by inserting an extra scope for
the body of the loop, not including the header.
BUG=chromium:542099
LOG=N
R=rossberg
Review URL: https://codereview.chromium.org/1396663004
Cr-Commit-Position: refs/heads/master@{#31268}
