[issue21714] Path.with_name can construct invalid paths

[Roundup Robot]

Roundup Robot added the comment:

New changeset c2636b5816a3 by Antoine Pitrou in branch '3.4':
Issue #21714: Disallow the construction of invalid paths using Path.with_name().  Original patch by Antony Lee.
http://hg.python.org/cpython/rev/c2636b5816a3

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nosy: +python-dev

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<http://bugs.python.org/issue21714>
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