(cc-ing dev.tech.js-engine.internals)
On 07/10/2014 05:07 PM, Marcell Vazquez-Chanlatte wrote:
Hey, I was told you were someone who might care if there is a bug in the Parser
API wiki or the parser.
Specifically, for the LetStatement in the parser api
(https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Parser_API)
This Wiki says,
head: [ { id: Pattern, init: Expression | null } ];
but Reflect.parse("for(let x=2;;){}") returns a LetStatement with a list of
VariableDeclarators.
This is not strictly equivilent because of the type and loc fields.
Yeah, this is really *really* gross. Currently our parser mangles that
for-statement into this:
let (x=2) for(;;){}
This is an example of a Reflect.parse bug around 'let' that's actually a
bug in the JS engine itself. The parser's current behavior predates ES6
'let' by several years. I hope these will be steadily fixed as we start
upgrading our support for 'let' to the ES6 standard. Shu-yu Guo and
Nathan Braswell have been working on that, but for(let;;) support is
probably a little further off.
Thanks for the simple test case! However **please** report any bugs via
Bugzilla, and tell your friends & coworkers to do the same -- I almost
missed this email entirely.
Cheers,
-j
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