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    <head>
      <base href="https://bugs.webkit.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ASSERTION FAILED: matchContextualKeyword(m_vm->propertyNames->async)"
   href="https://bugs.webkit.org/show_bug.cgi?id=183173">183173</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ASSERTION FAILED: matchContextualKeyword(m_vm->propertyNames->async)
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Local Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>JavaScriptCore
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>andre.bargull@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>SVN: rev228977
Build with: perl Tools/Scripts/build-jsc --jsc-only --debug


Executing the following test case leads to this assertion:
---
ASSERTION FAILED: matchContextualKeyword(m_vm->propertyNames->async)
../../Source/JavaScriptCore/parser/Parser.cpp(3640) : typename TreeBuilder::Expression JSC::Parser<LexerType>::parseAssignmentExpression(TreeBuilder&, JSC::Parser<LexerType>::ExpressionErrorClassifier&) [with TreeBuilder = JSC::ASTBuilder; LexerType = JSC::Lexer<unsigned char>; typename TreeBuilder::Expression = JSC::ExpressionNode*]
1   0x7f2e5603f705 WTFCrash
2   0x7f2e55b08569 JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseAssignmentExpression<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Parser<JSC::Lexer<unsigned char> >::ExpressionErrorClassifier&)
3   0x7f2e55af0da2 JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseAssignmentExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
4   0x7f2e55b32470 JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
5   0x7f2e55b39716 JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<unsigned char> >::parseExpressionStatement<JSC::ASTBuilder>(JSC::ASTBuilder&)
6   0x7f2e55b0eb2f JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<unsigned char> >::parseStatement<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, unsigned int*)
7   0x7f2e55af358d JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<unsigned char> >::parseStatementListItem<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, unsigned int*)
8   0x7f2e55adab62 JSC::ASTBuilder::SourceElements JSC::Parser<JSC::Lexer<unsigned char> >::parseSourceElements<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::SourceElementsMode)
9   0x7f2e55ac308b JSC::Parser<JSC::Lexer<unsigned char> >::parseInner(JSC::Identifier const&, JSC::SourceParseMode)
10  0x7f2e54f107cc std::unique_ptr<JSC::ProgramNode, std::default_delete<JSC::ProgramNode> > JSC::Parser<JSC::Lexer<unsigned char> >::parse<JSC::ProgramNode>(JSC::ParserError&, JSC::Identifier const&, JSC::SourceParseMode)
11  0x7f2e54f0b105 std::unique_ptr<JSC::ProgramNode, std::default_delete<JSC::ProgramNode> > JSC::parse<JSC::ProgramNode>(JSC::VM*, JSC::SourceCode const&, JSC::Identifier const&, JSC::JSParserBuiltinMode, JSC::JSParserStrictMode, JSC::JSParserScriptMode, JSC::SourceParseMode, JSC::SuperBinding, JSC::ParserError&, JSC::JSTextPosition*, JSC::ConstructorKind, JSC::DerivedContextType, JSC::EvalContextType, JSC::DebuggerParseData*)
...
---


Test case:
---
void class extends async()=>{}/a/g {}
---</pre>
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