Yury Selivanov <yseliva...@gmail.com> added the comment:

> The issue is minor, I suspect nobody wants to derive from ContextVar class.

I don't think that's allowed, actually.

> The generic implementation for __class_getitem__ is returning unmodified self 
> argument. Yuri, is there a reason to behave differently in the case of 
> ContextVar?

No, just an oversight, probably.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38979>
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