[issue20300] Argument Clinic raises exception for custom converter with default

[Roundup Robot]

Roundup Robot added the comment:

New changeset cc53c49d38c8 by Larry Hastings in branch 'default':
Issue #20300: Fix exception when setting conversion class member "default"
http://hg.python.org/cpython/rev/cc53c49d38c8

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20300>
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