[Webkit-unassigned] [Bug 104846] New: ASSERTION FAILED: (&term - term.atom.parenthesesWidth)->inputPosition == term.inputPosition

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104846

           Summary: ASSERTION FAILED: (&term -
                    term.atom.parenthesesWidth)->inputPosition ==
                    term.inputPosition
           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: danderson at mozilla.com
                CC: barraclough at apple.com


Originally from https://bugzilla.mozilla.org/show_bug.cgi?id=808478:

The expression:
  "h".match(RegExp("()??t()*"))

Causes this YARR assertion failure. At first I thought it was our local modifications to YARR, but it happens with upstream JSC as well. It looks like term.inputPosition gets set to -1 somewhere in emitDisjunction, but I haven't found out why yet.

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