The following will sleep:

  async def one():
      await asyncio.sleep(10)

  async def two():
      await one()

  loop.run_until_complete(two())

but the following will not:

  async def one():
      return asyncio.sleep(10)

  async def two():
      await one()

  loop.run_until_complete(two())

I would expect run_until_complete to keep bouncing awaitable results back into the event-loop until a non-awaitable is returned. In my code I work around this with:

  result = loop.run_until_complete(...)
  while inspect.isawaitable(result):
      result = loop.run_until_complete(result)

I would also expect that the await in `two` would have DTRT with the returned generator/coroutine.