[issue17810] Implement PEP 3154 (pickle protocol 4)

[Roundup Robot]

Roundup Robot added the comment:

New changeset a02adfb3260a by Christian Heimes in branch 'default':
Issue #17810: Add two missing error checks to save_global
http://hg.python.org/cpython/rev/a02adfb3260a

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<http://bugs.python.org/issue17810>
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