RESOLVED FIXED 162358
Disallow trailing commas in arrow function arguments, e.g. (X,)=>1 
https://bugs.webkit.org/show_bug.cgi?id=162358
Summary Disallow trailing commas in arrow function arguments, e.g. (X,)=>1
John Wilander
Reported 2016-09-21 13:49:35 PDT
Reported here: "(X,)=>1//safari ios10" https://twitter.com/garethheyes/status/778685893506850828 Chrome and Firefox don't allow it and according to the reporter Edge doesn't either.
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Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2016-12-01 12:38:07 PST
<rdar://problem/29464660>
Saam Barati
Comment 2 2016-12-02 12:25:09 PST
I'm pretty sure this is part of ES2017 spec
GSkachkov
Comment 4 2016-12-03 03:09:32 PST
He he. It is not bug it is a feature of ECMA 2017 Before proposal of this syntax was on stage 3, at beginning of November it was merged to master https://github.com/tc39/ecma262/pull/711 In spec https://tc39.github.io/ecma262/#prod-FormalParameters can be found: FormalParameters can be: FormalParameterList[?Yield, ?Await], Actually both Chrome Canary (57.0.2939.0 canary (64-bit)) and FireFox Nightly (52.0a1 (2016-10-15) (64-bit)) support this syntax now
Saam Barati
Comment 5 2016-12-12 17:34:11 PST
Closing this since it's the spec.
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