[Webkit-unassigned] [Bug 185995] New: for-in loops should preserve the TDZ stack for each of its internal loops.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185995

            Bug ID: 185995
           Summary: for-in loops should preserve the TDZ stack for each of
                    its internal loops.
           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: mark.lam at apple.com

This is because there's not guarantee that any of the loop bodies will have executed.  Hence, there's no guarantee that the TDZ variables will have beeb initialized after each loop body.

<rdar://problem/40173142>

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