[issue24400] Awaitable ABC incompatible with functools.singledispatch

[Yury Selivanov]

Yury Selivanov added the comment:

New patch is attached.

Updates:

1. Coroutine type now has 'cr_*' slots *both* in Python *and* in C.

2. set_coroutine_wrapper now works *only* on coroutines created by 'async def' functions (generators wrapped with types.coroutine won't be intercepted).

3. RuntimeWarning that coroutine wasn't ever awaited will be raised *only* for 'async def' coroutines.

4. Coroutine objects no longer have 'CO_GENERATOR' flag.

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Added file: http://bugs.python.org/file39740/corotype.patch

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