Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

I think that the current code is not correct. __exit__ should not be called if 
__enter__ is failed. If some __enter__ implementation calls other __enter__s it 
should manually call corresponding __exit__s.

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nosy: +michael.foord, ncoghlan, serhiy.storchaka
versions: +Python 3.8, Python 3.9 -Python 3.5, Python 3.6

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40126>
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