[Webkit-unassigned] [Bug 78438] New: Failed strict assignment to __proto__ not throwing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78438

           Summary: Failed strict assignment to __proto__ not throwing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: erights at gmail.com


In Version 5.1.2 (7534.52.7, r107511):

    > var x = Object.preventExtensions({});
    > var y = {};
    > function foo(){"use strict"; x.__proto__ = y;}
    > Object.getPrototypeOf(x) === Object.prototype
    true
    > foo()
    > Object.getPrototypeOf(x) === Object.prototype
    true

The above behavior correctly does not mutate x.__proto__, however, since it is a failed assignment and foo() is strict, the call to foo() should have thrown an exception. Instead it failed silently.

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