anchor.diff:          node.parameters,
           node.initializers,
           node.body,
  -        node.redirectedConstructor,
  -        node);
  +        node.redirectedConstructor);
       return null;
     }
   
  
positive.code:         node.functionExpression.parameters,
          null,
          node.functionExpression.body,
          null,
          node);
      return null;
    }
  
  
negative.code:       FormalParameterList parameters,
        NodeList<ConstructorInitializer> initializers,
        FunctionBody body,
        ConstructorName redirectedConstructor) {
      metadata.accept(this);
      var functionType = declaredElement.type;
      DecoratedType decoratedReturnType;
  