[issue39382] abstract_issubclass() doesn't take bases tuple item ref

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Thank you for your report and patch. Agree that the code does not look safe. Do you mind to create a pull request?

Would be nice to add a test for it. The three references to the Python class are:

* the __dict__ descriptor
* the __weakref__ descriptor
* the __mro__ tuple

You can get rid of the first two by setting __slots__ = () in the class definition. But it is not so easy with the __mro__ tuple. I will try more.

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versions: +Python 3.7, Python 3.8

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<https://bugs.python.org/issue39382>
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