[issue24400] Awaitable ABC incompatible with functools.singledispatch

[Yury Selivanov]

Yury Selivanov added the comment:

> With the two changes I described things appear to be working, although I've only done light testing so far.

Glad to hear that!  I've attached a new patch fixing types.coroutine per your request.

> More generally, the inconsistency between isgenerator() and iscoroutine() is kind of odd. I would expect that either all inspect functions or none of them would use a suitable ABC if one exists.

iscoroutine() is just a newer API than isgenerator().  I'll create a new issue for this soon.

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Added file: http://bugs.python.org/file39675/corotype.patch

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