[Webkit-unassigned] [Bug 162358] New: Disallow trailing commas in arrow function arguments, e.g. (X, )=>1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162358

            Bug ID: 162358
           Summary: Disallow trailing commas in arrow function arguments,
                    e.g. (X,)=>1
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wilander at apple.com

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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