[issue20317] ExitStack hang if enough nested exceptions

[Roundup Robot]

Roundup Robot added the comment:

New changeset 46c3ea358784 by Nick Coghlan in branch 'default':
Merge #20317 from 3.3
http://hg.python.org/cpython/rev/46c3ea358784

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<http://bugs.python.org/issue20317>
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