stack trace of suspended coroutine

["Russ Cox" <rsc@...>]

Is there a way to get the stack trace of a suspended coroutine?
For example:

	function f()
		coroutine.yield(1)
		coroutine.yield(2)
	end
	
	co = coroutine.create(f)
	print(coroutine.resume(co))
	-- Now how do I print the stack trace of co?

Thanks.
Russ