[issue29679] Add @contextlib.asynccontextmanager

[Nick Coghlan]

Nick Coghlan added the comment:

For anyone interested in the question of backports, I moved that discussion over to the contextlib2 tracker: https://github.com/jazzband/contextlib2/issues/12

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29679>
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