anchor.diff:        _write(element.displayName);
       }
   
  -    _writeFormalParameters(element.parameters);
  +    _writeFormalParameters(element.parameters, forElement: true);
     }
   
     void writeDynamicType() {
  
positive.code: 
    void _writeFormalParameters(
      List<ParameterElement> parameters, {
      bool withNamesOfPositional = true,
      bool withDefaultValueCode = true,
    }) {
      _write('(');
  
  
negative.code: 
    void _writeWithoutDelimiters(
      ParameterElement element, {
      @required bool forElement,
    }) {
      if (element.isRequiredNamed) {
        _write('required ');
  