[issue29302] add contextlib.AsyncExitStack

[Ilya Kulakov]

Ilya Kulakov added the comment:

> but at the same time rejected by the 'async with' statement.

Perhaps unittest.mock (or type) needs to be adjusted to allow mocking via spec= without subclassing?

> By all means you can submit a PR!

I'll take a look then.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29302>
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