anchor.diff:          node.functionExpression.parameters,
           null,
           node.functionExpression.body,
  -        null,
  -        node);
  +        null);
       return null;
     }
   
  
positive.code:         node.parameters,
          null,
          node.body,
          null,
          node);
      return null;
    }
  
  
negative.code:         node.parameters,
          node.initializers,
          node.body,
          node.redirectedConstructor);
      return null;
    }
  
  