Ethan commented:
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> 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.

Serhiy replied:
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> Without these changes pickling failed, but not because _make_class_unpicklable.

Well, the direct cause is that the Enum class in question failed to define __getnewargs__; the indirect cause is that without __getnewargs__ the metaclass will call _make_class_unpicklable.

So neither the enum nor its members should pickle.