Status: New
Owner: ----
New issue 3983 by [email protected]: Incorrect restriction on binding
identifiers of function expressions
https://code.google.com/p/v8/issues/detail?id=3983
Version: 22d62cea4d4d01d30286411cd11a6f3e15083cc0 (Thu Mar 19 08:04:47 2015
-0700)
OS: Ubuntu Linux
Architecture: x64
V8 does not currently allow `yield` as a BindingIdentifier for function
expressions within generator function bodies:
d8> function f() { (function yield() {}); }
undefined
d8> function* g() { (function yield() {}); }
(d8):1: SyntaxError: Unexpected identifier
function* g() { (function yield() {}); }
^^^^^
SyntaxError: Unexpected identifier
ES6 A.4 [1] defines the grammar for function expressions as follows:
FunctionExpression :
function BindingIdentifier opt ( FormalParameters ) { FunctionBody }
Because this definition does *not* include the [Yield] production parameter,
`yield` is a valid identifier in this context. (Note: this bug was
originally
identified by André Bargull while we migrated V8 tests to the Test262 suite
https://github.com/tc39/test262/pull/204#discussion_r26884899 .)
[1]
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-functions-and-classes
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