[issue25637] Move non-collections-related ABCs out of collections.abc

[Guido van Rossum]

Guido van Rossum added the comment:

I think ContextManager should be in contextlib. I don't want to put
anything in functools. Coroutine doesn't belong in asyncio, it's more
fundamental (closely related to Generator).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25637>
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