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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ASSERTION FAILED: inIndex != notFound in JSC::invalidParameterInSourceAppender()"
   href="https://bugs.webkit.org/show_bug.cgi?id=170924#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ASSERTION FAILED: inIndex != notFound in JSC::invalidParameterInSourceAppender()"
   href="https://bugs.webkit.org/show_bug.cgi?id=170924">bug 170924</a>
              from <span class="vcard"><a class="email" href="mailto:dbates@webkit.org" title="Daniel Bates <dbates@webkit.org>"> <span class="fn">Daniel Bates</span></a>
</span></b>
        <pre>ASSERTION FAILED: inIndex != notFound
/Volumes/Data/WebKitDevGit/OpenSource/Source/JavaScriptCore/runtime/ExceptionHelpers.cpp(208) : WTF::String JSC::invalidParameterInSourceAppender(const WTF::String &, const WTF::String &, JSC::RuntimeType, ErrorInstance::SourceTextWhereErrorOccurred)
1   0x109b6a00d WTFCrash
2   0x1091ef117 JSC::invalidParameterInSourceAppender(WTF::String const&, WTF::String const&, JSC::RuntimeType, JSC::ErrorInstance::SourceTextWhereErrorOccurred)
3   0x1091e6f65 JSC::appendSourceToError(JSC::ExecState*, JSC::ErrorInstance*, unsigned int)
4   0x1091e6c9e JSC::ErrorInstance::finishCreation(JSC::ExecState*, JSC::VM&, WTF::String const&, bool)
5   0x1091e1efa JSC::ErrorInstance::create(JSC::ExecState*, JSC::VM&, JSC::Structure*, WTF::String const&, WTF::String (*)(WTF::String const&, WTF::String const&, JSC::RuntimeType, JSC::ErrorInstance::SourceTextWhereErrorOccurred), JSC::RuntimeType, bool)
6   0x1091e242a JSC::createTypeError(JSC::ExecState*, WTF::String const&, WTF::String (*)(WTF::String const&, WTF::String const&, JSC::RuntimeType, JSC::ErrorInstance::SourceTextWhereErrorOccurred), JSC::RuntimeType)
7   0x1091eed6b JSC::createError(JSC::ExecState*, JSC::JSValue, WTF::String const&, WTF::String (*)(WTF::String const&, WTF::String const&, JSC::RuntimeType, JSC::ErrorInstance::SourceTextWhereErrorOccurred))
8   0x1091eefce JSC::createInvalidInParameterError(JSC::ExecState*, JSC::JSValue)
9   0x108ccb710 JSC::CommonSlowPaths::opIn(JSC::ExecState*, JSC::JSValue, JSC::JSValue, JSC::ArrayProfile*)
10  0x108ccb549 slow_path_in
11  0x1096ced82 llint_entry
12  0x1096c86fe vmEntryToJavaScript
13  0x10949e89e JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*)
14  0x10945009f JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::ExecState*, JSC::JSObject*)
15  0x108cdb028 JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&)
16  0x108cdb1f0 JSC::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&)
17  0x110243e1b WebCore::JSMainThreadExecState::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&)
18  0x110243c08 WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*)
19  0x110243efd WebCore::ScriptController::evaluate(WebCore::ScriptSourceCode const&, WebCore::ExceptionDetails*)
20  0x110259b42 WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&)
21  0x110257f8f WebCore::ScriptElement::prepareScript(WTF::TextPosition const&, WebCore::ScriptElement::LegacyTypeSupport)
22  0x10e9dba60 WebCore::HTMLScriptRunner::runScript(WebCore::ScriptElement&, WTF::TextPosition const&)
23  0x10e9db8cf WebCore::HTMLScriptRunner::execute(WTF::Ref<WebCore::ScriptElement>&&, WTF::TextPosition const&)
24  0x10e902b72 WebCore::HTMLDocumentParser::runScriptsForPausedTreeBuilder()
25  0x10e9030d3 WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&)
26  0x10e901e18 WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode)
27  0x10e90196b WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode)
28  0x10e9043da WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&)
29  0x10e2dec22 WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter&, char const*, unsigned long)
30  0x10e424b79 WebCore::DocumentWriter::addData(char const*, unsigned long)
31  0x10e3d866f WebCore::DocumentLoader::commitData(char const*, unsigned long)</pre>
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