Fix forward references in type parameters of overparameterized PEP 695 type aliases #19725
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Fixes #19734
Make semanal defer for placeholders in the upper bounds / constraints, even when the type variable doesn't appear in the target.
https://discuss.python.org/t/mypy-raises-exception-for-certain-type-alias-definitions-with-parameters-bounded-by-a-not-yet-defined-type/103305