[issue18780] SystemError when formatting int subclass

[Roundup Robot]

Roundup Robot added the comment:

New changeset 833246d42825 by Ethan Furman in branch 'default':
Issue #18780: code cleanup.
http://hg.python.org/cpython/rev/833246d42825

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18780>
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