Yury Selivanov <yseliva...@gmail.com> added the comment:

asyncio.coroutine sets the co_flags bit CO_ITERABLE_COROUTINE for generator 
functions' code objects.

With that bit flag, Python allows to 'yield from' native coroutines.

CoroWrapper.send() -> wrapped_generator.send() -> YIELD_FROM(native_coro) -> 
native_coro.send()

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32636>
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