iphone - Is there any downside to using __weak in non-ARC iOS Objective-C code? -

I am writing an IOS Objective-C code without ARC I like it

  __ Weak Myklas * myWaakIVar; From  

, e.g.

  MyClass * myWaikIvar; // weak  

This does not read better for me, but if I ever use this code on any garbage gathering platform etc. then I get the benefit of the __click instructions. Is there a downside in this? Put another way, is it currently equivalent to a nop on iOS (again, W / O ARC)? According to

__ weak the ARC is disabled if I do nothing on iOS