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I found one more place in asyncio.coroutines, around line 190 in the coroutine() decorator:
 if inspect.isgeneratorfunction(func):
 coro = func
 else:
 @functools.wraps(func)
 def coro(*args, **kw):
 res = func(*args, **kw)
 if isinstance(res, futures.Future) or inspect.isgenerator(res):
 res = yield from res
 return res
The wrapped isgenerator() check should be replaced by an Awaitable ABC check, e.g. this works for me:
"""
 res = func(*args, **kw)
 if isinstance(res, futures.Future) or inspect.isgenerator(res):
 res = yield from res
+ else:
+ await_res = getattr(res, '__await__', None)
+ if await_res is not None:
+ res = yield from await_res()
 return res
"""