[Webkit-unassigned] [Bug 158106] New: Safari on iOS 9.3.2 - TypeError, undefined, when attempting to call a custom method on an ES6 class extended from Array

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158106

            Bug ID: 158106
           Summary: Safari on iOS 9.3.2 - TypeError, undefined, when
                    attempting to call a custom method on an ES6 class
                    extended from Array
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: iOS
                OS: iOS 9.3
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: erik at nordstroem.no

Created attachment 279851
  --> https://bugs.webkit.org/attachment.cgi?id=279851&action=review
HTML file to reproduce problem

Calling a custom method on an ES6 class extended from Array results in TypeError, stating that the function is undefined.

Tested in:

- Safari on iOS 9.3.2

- Firefox 46.0.1 on Fedora 23

- Chrome Dev 52.0.2739.3 on Android 4.2.2


Steps to reproduce:

Serve attached HTML file with a web server, then open it in Safari on iOS 9.3.2. Observe that TypeError is thrown.


Expected outcome:

Calling the custom method should have worked.


Actual outcome:

Test fails with TypeError, undefined, in Safari on iOS 9.3.2, works in the other two browsers tested.

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