anchor.diff:  
         var result = _newPropertyResolver().resolve(
             operand, staticType, methodName, operand,
  -          receiverErrorNode: operand, isNullAware: false);
  +          receiverErrorNode: operand);
         node.staticElement = result.getter;
         if (_shouldReportInvalidMember(staticType, result)) {
           if (operand is SuperExpression) {
  
positive.code:     this._extensionResolver,
    ) : _typeSystem = _resolver.typeSystem;
  
    /// Look up the getter and the setter with the given [name] in the [type].
    ///
    /// The [target] is optional, and used to identify `super`.
  
negative.code: 
      ResolutionResult result = _newPropertyResolver().resolve(
          leftOperand, leftType, methodName, node,
          receiverErrorNode: leftOperand);
  
      node.staticElement = result.getter;
      node.staticInvokeType =
  