[issue31411] SystemError raised by warn_explicit() in case warnings.onceregistry is not a dict

[Serhiy Storchaka]

Serhiy Storchaka added the comment:


New changeset 7972ed2111ea2f01e8712eef91bcf2260e05ad8b by Serhiy Storchaka in branch '3.6':
[3.6] bpo-31411: Prevent raising a SystemError in case warnings.onceregistry is not a dictionary. (GH-3485). (#3494)
https://github.com/python/cpython/commit/7972ed2111ea2f01e8712eef91bcf2260e05ad8b


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