[Webkit-unassigned] [Bug 159270] New: Spurious "Can't create duplicate variable that shadows a global property"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159270

            Bug ID: 159270
           Summary: Spurious "Can't create duplicate variable that shadows
                    a global property"
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d at domenic.me

https://settings-object-worker-client-ckrcsrtdqr.now.sh/ (source at https://settings-object-worker-client-ckrcsrtdqr.now.sh/_src) triggers "SyntaxError: Can't create duplicate variable that shadows a global property: 'c'"

The window has a named property 'c' since I declare an <iframe> with id="c". But then I tried to do `const c = document.querySelector("#c").contentWindow` and got that error.

That error does not appear in other browsers, and I believe has no support in the specs. (Not that window.c is supposed to be configurable.)

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