Erez Zinman <erezinman.program...@gmail.com> added the comment:

This is actually a lot worse and unrelated to the aforementioned issue.

The code 

```
from typing import Union
from abc import ABC


Union[str, ABC]
```

raises the exception

 >>> TypeError: descriptor '__subclasses__' of 'type' object needs an argument

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43595>
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