8000 Reconsider constraints involving parameter specifications by A5rocks · Pull Request #15272 · python/mypy · GitHub
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Reconsider constraints involving parameter specifications #15272

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Merged
merged 5 commits into from
Aug 9, 2023
Merged

Reconsider constraints involving parameter specifications #15272

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0cf8a66
Reconsider constraints involving parameter specifications
A5rocks May 19, 2023
e9f8774
Merge branch 'master' into fix-paramspec-constraints
A5rocks Jul 2, 2023
a979083
Quick fix, I think
A5rocks Jul 7, 2023
2480ac6
Add some tests (even if one has the wrong result)
A5rocks Jul 7, 2023
9d41d9c
Test and behavior fixes
A5rocks Jul 8, 2023
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Merge branch 'master' into fix-paramspec-constraints
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@A5rocks
A5rocks authored Jul 2, 2023
commit e9f877475eecce2e3befb8fd624b42a540229fa6
15 changes: 15 additions & 0 deletions test-data/unit/check-parameter-specification.test
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Expand Up @@ -1572,3 +1572,18 @@ x: Callable[
Callable[P, None],
] = f
[builtins fixtures/paramspec.pyi]

[case testParamSpecDecoratorAppliedToGeneric]
# flags: --new-type-inference
from typing import Callable, List, TypeVar
from typing_extensions import ParamSpec

P = ParamSpec("P")
T = TypeVar("T")
U = TypeVar("U")

def dec(f: Callable[P, T]) -> Callable[P, List[T]]: ...
def test(x: U) -> U: ...
reveal_type(dec) # N: Revealed type is "def [P, T] (f: def (*P.args, **P.kwargs) -> T`-2) -> def (*P.args, **P.kwargs) -> builtins.list[T`-2]"
reveal_type(dec(test)) # N: Revealed type is "def [U] (x: U`-1) -> builtins.list[U`-1]"
[builtins fixtures/paramspec.pyi]
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