anchor.diff:      for (Selector selector in selectors.keys) {
         if (generatedSelectors.contains(selector)) continue;
         if (!selector.appliesUnnamed(member)) continue;
  -      if (selectors[selector]
  +      if (selectors[selector]!
             .canHit(member, selector.memberName, _closedWorld)) {
           generatedSelectors.add(selector);
   
  
positive.code: 
    ClassStubGenerator(this._emitter, this._commonElements, this._namer,
        this._codegenWorld, this._closedWorld,
        {this.enableMinification});
  
    InterceptorData get _interceptorData => _closedWorld.interceptorData;
  
  
negative.code:     // receiver explicitly and we need to pass it to the getter call.
      bool isInterceptedMethod = _interceptorData.isInterceptedMethod(member);
      bool isInterceptedClass =
          _interceptorData.isInterceptedClass(member.enclosingClass!);
  
      const String receiverArgumentName = r'$receiver';
  
  