Add stub for AsyncExitContext added by bpo-29302.#1876

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JelleZijlstra merged 5 commits intopython:masterfrom

Kentzo:bpo-29302

Feb 17, 2018

Commits on Feb 12, 2018

Add stub for AsyncExitContext added by bpo-29302.
Kentzo
committed

Commits on Feb 13, 2018

Future -> Awaitable.
Kentzo
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Commits on Feb 14, 2018

Return type for pop_all should type(self).
Kentzo
committed

Commits on Feb 17, 2018