[issue20534] Enum tests fail with pickle protocol 4

[Ethan Furman]

Ethan Furman added the comment:

Okay, I went with __reduce__ since we don't ever use the pickle protocol information.

I added a test for class-nested Enums since protocol 4 supports it.

I left the test for test_subclasses_without_getnewargs alone as the point of that test is to make sure that _make_class_unpicklable is working properly, not to see if we can somehow get any of it to pickle.

Running all tests now.

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Added file: http://bugs.python.org/file33968/issue20534.stoneleaf.02.patch

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