I'm building for iOS 9.3, and am using NSOperationQueue throughout. Once in a 
while, NSOperationQueue -addOperation: throws an exception. I guess this is a 
well-known bug going all the way back to 2008. I found Mike Ash's writeup on 
the issue, and have downloaded his replacement class, RAOperationQueue. 
However, it was written long ago for GC not ARC. I have one remaining problem 
in converting the code.

- (BOOL)_runOperationFromList: (RAAtomicListRef *)listPtr sourceList: 
(RAAtomicListRef *)sourceListPtr
{
        RAOperation *op = [self _popOperation: listPtr];
        if( !op )
        {
                *listPtr = RAAtomicListSteal( sourceListPtr );
                // source lists are in LIFO order, but we want to execute 
operations in the order they were enqueued
                // so we reverse the list before we do anything with it
                RAAtomicListReverse( listPtr );
                op = [self _popOperation: listPtr];
        }
        
        if( op )
                [op run];  <-- ERROR HERE
        
        return op != nil;
}

The error I'm getting is: Receiver type 'RAOperation' for instance message is a 
forward declaration.

What does this error mean, and how can I fix it?
-Carl

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