[Webkit-unassigned] [Bug 159332] New: Scopes that are not under TDZ should still push their variables onto the TDZ stack so that lifting TDZ doesn't bypass that scope

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159332

            Bug ID: 159332
           Summary: Scopes that are not under TDZ should still push their
                    variables onto the TDZ stack so that lifting TDZ
                    doesn't bypass that scope
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

This fixes an instacrash in this code:

function foo () {
try{}catch(e){}print(e);let e;
}

foo();

We lift TDZ for "e" in "catch (e){}", but since that scope doesn't push anything onto the TDZ stack, we lift TDZ from "let e".

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