[issue24017] Implemenation of the PEP 492 - Coroutines with async and await syntax

[Yury Selivanov]

Changes by Yury Selivanov <yselivanov at gmail.com>:


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dependencies: +Awaitable ABC incompatible with functools.singledispatch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24017>
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