[issue34909] StrEnum subclasses cannot be created

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

Hi Ethan,

the issue appears with your patch 

0c076caaa82a9c6596e1fe1dbe6384d53f30a1a3 is the first bad commit
commit 0c076caaa82a9c6596e1fe1dbe6384d53f30a1a3
Author: Ethan Furman <ethan at stoneleaf.us>
Date:   Fri Sep 21 22:26:32 2018 -0700

    [3.7] bpo-29577: Enum: mixin classes don't mix well with already mixed Enums (GH-9328) (GH-9486)
    
    * bpo-29577: allow multiple mixin classes


(found with git bisect and your test)

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nosy: +matrixise

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<https://bugs.python.org/issue34909>
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