New submission from Erez Zinman <[email protected]>:
Related to Issue #43594.
When running the following code
```
from abc import ABCMeta, ABC
from typing import Union
class MetaclassMixin(ABC):
pass
class Meta(MetaclassMixin, ABCMeta):
pass
print(Union[str, Meta])
```
An exception is raised
>>> TypeError: descriptor '__subclasses__' of 'type' object needs an argument
Tested on v3.6.9
----------
messages: 389317
nosy: erezinman
priority: normal
severity: normal
status: open
title: Can not add a metclass that inherits both ABCMeta & ABC to a Union
versions: Python 3.6
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Python tracker <[email protected]>
<https://bugs.python.org/issue43595>
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