[3.7] bpo-38979: fix ContextVar "__class_getitem__" method (GH-17497) #17506
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now contextvars.ContextVar "class_getitem" method returns ContextVar class, not None.
https://bugs.python.org/issue38979
Automerge-Triggered-By: @asvetlov
(cherry picked from commit 28c9163)
Co-authored-by: AMIR 31338382+amiremohamadi@users.noreply.github.com
https://bugs.python.org/issue38979