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Add redundant-annotation warning #20238

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Add redundant-annotation warning #20238

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5910e0d
Add redundant-annotation warning
grayjk Nov 14, 2025
a72ba7a
use is_class_var
grayjk Nov 15, 2025
593d4e0
skip bare ClassVar
grayjk Nov 15, 2025
d851922
correct context for --pretty
grayjk Nov 15, 2025
1082552
add confval
grayjk Nov 16, 2025
ebf40a5
additional tests
grayjk Nov 16, 2025
32a696f
func local
grayjk Nov 24, 2025
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additional tests
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@grayjk
grayjk committed Nov 16, 2025
commit ebf40a5b05ef15bb29d2ccd6c371d5e815fc6180
18 changes: 17 additions & 1 deletion test-data/unit/check-warnings.test
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Expand Up @@ -73,10 +73,14 @@ def f(q: Union[x, y, z]) -> None:

[case testRedundantAnnotation]
# flags: --warn-redundant-annotation
from typing import Literal
a = 1
b: int = a
c: Literal[1] = 1
d: list[str] = []
[out]
main:3: error: Annotation "int" is redundant (inferred type is the same)
main:4: error: Annotation "int" is redundant (inferred type is the same)
main:5: error: Annotation "Literal[1]" is redundant (inferred type is the same)

[case testRedundantAnnotationClassVar]
# flags: --warn-redundant-annotation
Expand All @@ -88,6 +92,18 @@ class a:
[out]
main:5: error: Annotation "int" is redundant (inferred type is the same)

[case testRedundantAnnotationTypeVar]
# flags: --warn-redundant-annotation
from typing import Literal, TypeVar

T = TypeVar("T")

def f(x: T) -> T:
return x

x: Literal[1] = f(1)
y: list[str] = f([])

[case testRedundantAnnotationSkips]
# flags: --warn-redundant-annotation
from dataclasses import dataclass
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