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

[Roundup Robot]

Roundup Robot added the comment:

New changeset ea1edf1bf362 by Benjamin Peterson in branch '2.7':
when you enter repr, you must leave, too (#25455)
https://hg.python.org/cpython/rev/ea1edf1bf362

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