[issue11572] bring Lib/copy.py to 100% coverage

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

JFTR, the same kind of check of __reduce_ex__ and then falling back on __reduce__ is prenset in pickle too: maybe it's worth align them?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11572>
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