[issue28919] Simplify `_copy_func_details` in unittest.mock

[Jiajun Huang]

Jiajun Huang added the comment:

So what should I do next to make the code being merged into CPython? I am new to mercurial(or just wait for it?).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28919>
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