Closure copy (Disclaimer: I don't need to do this, I just want to know if it's possible :))

closure_copy

// OBJC

@property (nonatomic, copy) MyBlock myBlock;

- (void)makeSomethingWithCompletionBlock:(MyBlock)completionBlock
{
  self.myBlock = completionBlock;
}

// SWIFT

var myBlock: (()->String)?;

func makeSomethingWithCompletionBlock(completionBlock:()->String) {
  myBlock = completionBlock // It's possible to make a copy at this point? And not just reference the closure?
}