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Add test for #1513

This commit is contained in:
David Peter 2025-12-10 14:42:25 +01:00
parent 0304c31989
commit 1fd9dc529c
1 changed files with 21 additions and 0 deletions
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crates/ty_python_semantic/resources/mdtest/type_of/generics.md
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@ -449,3 +449,24 @@ expects_type_c_default(C[int])
expects_type_c_default_of_int(C[str])
expects_type_c_default_of_int_str(C[str, int])
```
## Narrowing for generic `@final` classes
When narrowing a `type[GenericFinal]` where `GenericFinal` is a generic `@final` class, we can
conclude that the `issubclass` check always succeeds:
```py
from typing import final
@final
class GenericFinal[T]:
x: T
def f(x: type[GenericFinal]):
reveal_type(x) # revealed: <class 'GenericFinal[Unknown]'>
if issubclass(x, GenericFinal):
reveal_type(x) # revealed: <class 'GenericFinal[Unknown]'>
else:
reveal_type(x) # revealed: Never
```