[issue25455] Some repr implementations don't check for self-referential structures

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7859742826b2 by Serhiy Storchaka in branch '2.7':
Issue #25455: Backported tests for pickling recursive functools.partial objects.
https://hg.python.org/cpython/rev/7859742826b2

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<http://bugs.python.org/issue25455>
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