[issue25698] test regressions introduced with the fix for #22995

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Default __reduce_ex__ and __reduce__ implementations call copy_reg._reduce_ex. cPickle.dumps({}) works because __reduce_ex__ is not called, dict is supported by pickle directly.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25698>
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