yield from future and trollius in debug mode

yield_from.py

import os
import logging

os.environ['PYTHONASYNCIODEBUG'] = 'debug'
os.environ['TROLLIUSDEBUG'] = 'debug'

import asyncio
from asyncio import Future
import trollius

asyncio.set_event_loop_policy(trollius.get_event_loop_policy())


def coro():
    future = Future()
    future._loop.call_later(1, future.set_result, 'Hi')
    result = yield from future
    print(result)


if __name__ == '__main__':
    logging.basicConfig(level='DEBUG')
    loop = trollius.get_event_loop()
    loop.run_until_complete(coro())