[3.9] bpo-42195: Override _CallableGenericAlias's __getitem__ (GH-23915)#23916
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miss-islington merged 1 commit intopython:3.9from Dec 24, 2020
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Added
__getitem__for_CallableGenericAliasso that it returns a subclass (itself) oftypes.GenericAliasrather than the default behavior of returning a plaintypes.GenericAlias. This fixesreprissues occuring afterTypeVarsubstitution arising from the previous behavior.(cherry picked from commit 6dd3da3)
Co-authored-by: kj 28750310+Fidget-Spinner@users.noreply.github.com
https://bugs.python.org/issue42195