Aiohttp: RuntimeWarning: coroutine 'noop' was never awaited

[AtomsForPeace]

Long story short

I get this when I run pytest with -s.

Apparently it was already noticed and dealt with here:
https://github.com/aio-libs/aiohttp/blob/f30a2043bb7e45d3ac775612c20c6e453f7c60f6/aiohttp/helpers.py#L103-L104

Expected behaviour

No warnings

Actual behaviour

Warnings

Steps to reproduce

The following test:
python -m pytest tests/test_web_functional.py::test_subapp_reverse_static_url[pyloop] -x -s

Your environment

I get it in python3.7 and python3.8.
Linux Mint 18.3
On aiohttp master

Any suggestions on how do fix it?
Maybe a sync and async version of noop?
I can make a pull request.

[AtomsForPeace]

Something similar here: #4177

[asvetlov]

I think we need noop class with __await__ method.
@AtomsForPeace would you work on it?

[AtomsForPeace]

Sure thing!

[kroitor]

Got the same issue with aiohttp 4.0.0a1 Python 3.7.2 on MacOS:

/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/aiohttp/client.py:977:
RuntimeWarning: coroutine 'noop' was never awaited
  self._resp.release()
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

The application works, but the warnings are there.

Is there a way to handle or silence this (apart from downgrading back to 3.6.x)? Really looking forward to getting it fixed! Will be happy to provide more info if needed, just lmk.

[asvetlov]

Fixed by #4322