anchor.diff:    @override
     CompilationUnitElement get enclosingElement =>
         super.enclosingElement as CompilationUnitElement;
  -
  -  @override
  -  TypeParameterizedElementMixin get enclosingTypeParameterContext => null;
   
     @override
     CompilationUnitElementImpl get enclosingUnit =>
  
positive.code:     }
      return super.documentationComment;
    }
  
    @override
    TypeParameterizedElementMixin get enclosingTypeParameterContext => null;
  
    @override
    List<FieldElement> get fields {
  
negative.code:   /// [nameOffset]. This is used for function expressions, that have no name.
    GenericFunctionTypeElementImpl.forOffset(int nameOffset)
        : super("", nameOffset);
  
    @override
    String get identifier => '-';
  