[issue46296] Unreachable condition: `if enum_class._member_type_ is object`

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

Looking through some of my code that prompted that branch, the issue is caused when `_generate_next_value_` modifies the given args -- when `__set_name__` runs it has no way of getting the same results to automatically create the `_value_` attribute.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46296>
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