[issue29577] Enum: mixin classes don't mix well with already mixed Enums

[Ethan Furman]

Ethan Furman added the comment:

To get the above code snippet to fail properly:
- remove the @classattr line
- prepend from enum import Enum, Flag, IntFlag, auto

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29577>
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