[issue24004] avoid explicit generator type check in asyncio

[Yury Selivanov]

Yury Selivanov added the comment:

> Why is the AwaitableABC type check needed, in addition to looking up the relevant method? IIUC, the type check will just do a lookup of the same method if the type hasn't been registered as Awaitable explicitly.

Because __await__ should be defined on the class, not on the method (as for all other magic methods in Python).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24004>
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