Re: GC:ARC passing '...' to a sink parameter introduces an implicit copy; use 'move(...)' to prevent it

[cumulonimbus]

If so, please make the current aggressive warning an option - and provide 
copy() to suppress it. Not sure what the default should be, but one of the the 
reason I switched back from C++ back to C is because it's way too easy to 
introduce unwanted operations (copies and other) -- which is usually fine in 
high level code, but a big problem in performance sensitive code.