[issue24400] Awaitable ABC incompatible with functools.singledispatch

[Stefan Behnel]

Stefan Behnel added the comment:

> I originally planned to make the next Cython release patch the Generator
> and Coroutine ABCs into collections.abc, but I now think it would be worth
> uploading an "abc_backports" package to PyPI instead that does that and on
> which asyncio, tornado and other packages could simply depend with a
> try-import.

Done:

https://pypi.python.org/pypi/backports_abc

Feedback welcome.

Stefan

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