That was many years ago. I was assuming tinco was referring to something more recent. Besides, AFAIK, every usage of blocks in Apple's headers is guarded by an

That was many years ago. I was assuming tinco was referring to something more recent. Besides, AFAIK, every usage of blocks in Apple's headers is guarded by an #if check to make sure blocks are supported, so compilers that don't support blocks won't even see them.