Bring over TypeVarTests from CPython#165
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I started out trying to backport python/cpython#104571, but realized that it makes sense to backport CPython's whole TypeVarTests class since we now have our own implementation of TypeVar. I dropped test_var_substitution and test_bad_var_substitution since they rely on the internal __typing_subst__ method, and the type substitution logic is generally very hard to get precisely the same across versions.
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JelleZijlstra commented May 21, 2023
CI is failing because we didn't bring over the fix for python/cpython#84123. It doesn't seem worth the effort to fix that for early versions of 3.7 and 3.8, so I'm just going to skip that test before 3.9. |
AlexWaygood approved these changes May 21, 2023
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AlexWaygood left a comment There was a problem hiding this comment.
Haven't done a line-by-line review, but I trust in your copy-and-paste abilities :)
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I started out trying to backport python/cpython#104571, but
realized that it makes sense to backport CPython's whole TypeVarTests
class since we now have our own implementation of TypeVar.
I dropped test_var_substitution and test_bad_var_substitution
since they rely on the internal typing_subst method, and the
type substitution logic is generally very hard to get precisely
the same across versions.