[issue25779] deadlock with asyncio+contextmanager+ExitStack

[Yury Selivanov]

Yury Selivanov added the comment:

It's not even a reprlib bug:

try:
    raise Exception
except Exception as ex:
    ex.__context__ = ex
    hasattr(1, 'aa')

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25779>
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