Yury Selivanov added the comment:

Looking at the code: we don't need to use iscoroutinefunction at all.  If we 
had separate methods for sync and async context managers, you can store the 
flag if a function is async or sync along with it.

So _exit_callbacks should store tuples `(is_async, cb)`, instead of just `cb`.

asyncio.iscoroutinefunction differs from inspect.iscoroutinefunction a little 
bit to support asyncio-specific debug coroutine wrapper functions.  We should 
avoid using any version of iscoroutinefunction here.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29302>
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