[issue27141] Fix collections.UserList shallow copy

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I prefer issue27141_patch_rev1_opt1.patch. But now we use GitHub. Do you mind to create a pull request Bar?

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stage:  -> needs patch
versions:  -Python 3.2, Python 3.3, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27141>
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