[issue38979] ContextVar[str] should return ContextVar class, not None

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 960fca1a5887a277fd6031cf4c4b6fb31b08ebf5 by Miss Islington (bot) in branch '3.8':
bpo-38979: fix ContextVar "__class_getitem__" method (GH-17497)
https://github.com/python/cpython/commit/960fca1a5887a277fd6031cf4c4b6fb31b08ebf5


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<https://bugs.python.org/issue38979>
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