[Twisted-Python] Mixing async/await and asyncio

[whalebot.helmsman at gmail.com]

I want to learn how to use twisted together with asyncio. I create 
several files to describe my problem 
https://gist.github.com/whalebot-helmsman/c400eb66c0bd35e406de3f8f704adf13:

- I can use pure asyncio for simple case (asyncio_ex.py)

- I can use pure twisted for simple case (twisted_ex.py)

- I can await in twisted on twsited defer (twisted_await.py)

I have a problem in case I try to await in twisted for asyncio 
coroutine(twisted_await_asyncio.py). Program never finishes and I got 
only started messages

2018-09-19 12:48:59,633 [WARNING] PID:8238 
/home/nikita/tmp/twisted_await_asyncio.py:12 started
2018-09-19 12:48:59,633 [WARNING] PID:8238 
/home/nikita/tmp/twisted_await_asyncio.py:12 started