[issue25731] Assigning and deleting __new__ attr on the class does not allow to create instances of this class

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3ff84a3eeb6b by Benjamin Peterson in branch '2.7':
Backed out changeset e7062dd9085e (#25731)
https://hg.python.org/cpython/rev/3ff84a3eeb6b

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