objective c - How can I get rid of an "unused variable" warning in Xcode? -

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I understand that unused variables are due to warnings. I do not want to suppress them normally because they are incredibly useful in most cases. However, consider the following (genetic) code. 

  NSError * Error = zero; BOOL saved = [moc save: & amp; Error]; NSAssert1 (saved, @ "Dude !! 1!% @ !!!", error);   
 Xcode reports that  saved  is an unused variable, when it is not at all. I suspect this because  NSAssert1  is a macro  NS_BLOCK_ASSERTIONS  macro is defined  not , hence the claim of objective C is definitely enabled.  
 Although it does not hurt anything, I make it unnecessary and annoying, and I want to suppress it, but I am not sure how to do it. Assigning the variable to yourself will get rid of the compiler warning, but I would like to do this in the "right way" if such a thing exists. I am unsure that it is still supported in the new LLVM compiler, but in GCC an "unused" The attribute that you can use to suppress the warning:  
  BOOL saved __detect __ ((unused)) [[save mock: & amp; Error]; Alternatively (if the LLVM does not support above), you can split the variable declaration into a separate row, guaranteeing that the "matros" macro expands:  
  BOOL saved = no; Saved = [save mok: & amp; Error];

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