[issue21925] ResourceWarning sometimes doesn't display

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1de90a7065ba by Victor Stinner in branch '3.5':
warnings.formatwarning(): catch exceptions
https://hg.python.org/cpython/rev/1de90a7065ba

New changeset 36be356f6253 by Victor Stinner in branch 'default':
Merge 3.5
https://hg.python.org/cpython/rev/36be356f6253

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21925>
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