[issue25779] deadlock with asyncio+contextmanager+ExitStack

[Yury Selivanov]

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


----------
superseder: infinite loop in reprlib -> CPython hangs on error __context__ set to the error itself

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