[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 9baa870c27b54c26f9dd292c26936b70bdb64a06 by Miss Islington (bot) in branch '3.7':
bpo-38979: fix ContextVar "__class_getitem__" method (GH-17497)
https://github.com/python/cpython/commit/9baa870c27b54c26f9dd292c26936b70bdb64a06


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