[issue22676] _pickle's whichmodule() is slow

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3e3bec66409c by Antoine Pitrou in branch 'default':
Fix uninitialized variable after #22676.
https://hg.python.org/cpython/rev/3e3bec66409c

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<http://bugs.python.org/issue22676>
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