anchor.diff:              isConst: constKeyword != null));
     }
   
  +  @override
     void endLiteralMapEntry(Token colon, Token endToken) {
       debugEvent("LiteralMapEntry");
       Expression value = popForValue();
  
positive.code:     push(variable);
    }
  
    void endOptionalFormalParameters(
        int count, Token beginToken, Token endToken) {
      debugEvent("OptionalFormalParameters");
  
negative.code:         isSetter: isSetter);
    }
  
    @override
    Member lookupSuperMember(Name name, {bool isSetter: false}) {
      Class superclass = classBuilder.cls.superclass;
      return superclass == null
  