[issue20317] ExitStack hang if enough nested exceptions

[Roundup Robot]

Roundup Robot added the comment:

New changeset b3c2472c12a1 by Nick Coghlan in branch '3.3':
Issue #20317: Don't create a reference loop in ExitStack
http://hg.python.org/cpython/rev/b3c2472c12a1

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nosy: +python-dev

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