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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

copy and pickle use the same protocol. The copy module shouldn't be changed independently, the changes should be synchronised with both implementations of the pickle module.

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