parseUnit(Stream)
  skipErrorTokens(Stream)
  listener: beginCompilationUnit(Stream)
  syntheticPreviousToken(Stream)
  parseTopLevelDeclarationImpl(, Instance of 'DirectiveContext')
    parseMetadataStar()
      listener: beginMetadataStar(Stream)
      listener: endMetadataStar(0)
    parseTopLevelMemberImpl()
      listener: beginTopLevelMember(Stream)
      parseFields(, null, null, null, null, null, null, , Instance of 'ComplexTypeInfo', y, DeclarationKind.TopLevel, null, false)
        listener: beginFields(DeclarationKind.TopLevel, null, null, null, null, null, null, )
        ensureIdentifier(, typeReference)
          listener: handleIdentifier(Stream, typeReference)
        listener: beginTypeArguments(<)
        listener: handleIdentifier(List, typeReference)
        listener: beginTypeArguments(<)
        listener: handleIdentifier(x, typeReference)
        listener: handleNoTypeArguments(>)
        listener: handleType(x, null)
        listener: endTypeArguments(1, <, >)
        listener: handleType(List, null)
        listener: endTypeArguments(1, <, >)
        listener: handleType(Stream, null)
        ensureIdentifierPotentiallyRecovered(>, topLevelVariableDeclaration, false)
          listener: handleIdentifier(y, topLevelVariableDeclaration)
        parseFieldInitializerOpt(y, y, null, null, null, null, DeclarationKind.TopLevel, null)
          listener: handleNoFieldInitializer(;)
        listener: endTopLevelFields(null, null, null, null, null, 1, Stream, ;)
  listener: endTopLevelDeclaration()
  reportAllErrorTokens(Stream)
  listener: endCompilationUnit(1, )