anchor.diff:    @override
     Uri get sourceUri => _sourceLocation.sourceUri;
   
  -  @override operator ==(other) {
  +  @override
  +  operator ==(other) {
       return other is _SourceLocationImpl &&
           other._sourceLocation == _sourceLocation;
     }
  
positive.code:   _SpecialTypeMirrorImpl(dm.TypeMirror typeMirror, ReflectableImpl reflectable)
        : super(typeMirror, reflectable);
  
    @override operator ==(other) {
      return other is _SpecialTypeMirrorImpl && other._typeMirror == _typeMirror;
    }
  
  
negative.code:     for (dm.DeclarationMirror declaration in classMirror.declarations.values) {
        if (declaration is dm.VariableMirror) {
          dm.TypeMirror typeMirror = declaration.type.originalDeclaration;
          if (typeMirror is dm.ClassMirror &&
              typeMirror is! dm.FunctionTypeMirror) {
            yield typeMirror;
          }
        } else if (declaration is dm.MethodMirror) {
          for (dm.ParameterMirror parameter in declaration.parameters) {
            dm.TypeMirror typeMirror = parameter.type.originalDeclaration;
            if (typeMirror is dm.ClassMirror &&
                typeMirror is! dm.FunctionTypeMirror) {
              yield typeMirror;
            }
          }
          dm.TypeMirror typeMirror = declaration.returnType;
          if (typeMirror is dm.ClassMirror &&
              typeMirror is! dm.FunctionTypeMirror) {
            yield typeMirror;
          }
        }
      }
      for (dm.TypeVariableMirror typeVariableMirror
          in classMirror.typeVariables) {
        dm.TypeMirror typeMirror = typeVariableMirror.upperBound;
        if (typeMirror is dm.ClassMirror &&
            typeMirror is! dm.FunctionTypeMirror) {
          yield typeMirror;
        }
      }
  