[Webkit-unassigned] [Bug 169040] New: Class Proxy can't be extended

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169040

            Bug ID: 169040
           Summary: Class Proxy can't be extended
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dominic.szablewski at gmail.com

A `Proxy` for a `class` can't be extended. When calling `SubClass extends ProxiedClass {}` JSC apparently tries to extend `Proxy` itself(?) instead of the underlying proxied class.

Test case:
http://phoboslab.org/files/bugs/safari-proxy-class.html

Tested in:
- Chrome (56.0.2924.87 (64-bit) macOS): success
- Firefox (51.0.1 (64-bit) macOS): success
- Safari TP (Release 24 (Safari 10.2, WebKit 12604.1.6)): fail

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