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Code Issues Projects Releases Packages Wiki Activity Actions 3

[ty] Improve diagnostics for bad @overload definitions (#20745)
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Alex Waygood 2025-10-07 22:52:57 +01:00 • committed by GitHub
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10 changed files with 390 additions and 88 deletions
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191
crates/ty/docs/rules.md generated
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@ -36,7 +36,7 @@ def test(): -> "int":
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20call-non-callable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L114)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L115)
</small>
**What it does**
@ -58,7 +58,7 @@ Calling a non-callable object will raise a `TypeError` at runtime.
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20conflicting-argument-forms) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L158)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L159)
</small>
**What it does**
@ -88,7 +88,7 @@ f(int) # error
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20conflicting-declarations) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L184)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L185)
</small>
**What it does**
@ -117,7 +117,7 @@ a = 1
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20conflicting-metaclass) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L209)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L210)
</small>
**What it does**
@ -147,7 +147,7 @@ class C(A, B): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20cyclic-class-definition) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L235)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L236)
</small>
**What it does**
@ -177,7 +177,7 @@ class B(A): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20duplicate-base) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L300)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L301)
</small>
**What it does**
@ -202,7 +202,7 @@ class B(A, A): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20duplicate-kw-only) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L321)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L322)
</small>
**What it does**
@ -306,7 +306,7 @@ def test(): -> "Literal[5]":
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20inconsistent-mro) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L524)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L525)
</small>
**What it does**
@ -334,7 +334,7 @@ class C(A, B): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20index-out-of-bounds) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L548)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L549)
</small>
**What it does**
@ -358,7 +358,7 @@ t[3] # IndexError: tuple index out of range
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20instance-layout-conflict) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L353)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L354)
</small>
**What it does**
@ -445,7 +445,7 @@ an atypical memory layout.
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-argument-type) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L593)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L594)
</small>
**What it does**
@ -470,7 +470,7 @@ func("foo") # error: [invalid-argument-type]
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-assignment) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L633)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L634)
</small>
**What it does**
@ -496,7 +496,7 @@ a: int = ''
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-attribute-access) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1688)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1745)
</small>
**What it does**
@ -528,7 +528,7 @@ C.instance_var = 3 # error: Cannot assign to instance variable
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-await) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L655)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L656)
</small>
**What it does**
@ -562,7 +562,7 @@ asyncio.run(main())
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-base) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L685)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L686)
</small>
**What it does**
@ -584,7 +584,7 @@ class A(42): ... # error: [invalid-base]
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-context-manager) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L736)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L737)
</small>
**What it does**
@ -609,7 +609,7 @@ with 1:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-declaration) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L757)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L758)
</small>
**What it does**
@ -636,7 +636,7 @@ a: str
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-exception-caught) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L780)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L781)
</small>
**What it does**
@ -678,7 +678,7 @@ except ZeroDivisionError:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-generic-class) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L816)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L817)
</small>
**What it does**
@ -709,7 +709,7 @@ class C[U](Generic[T]): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-key) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L568)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L569)
</small>
**What it does**
@ -738,7 +738,7 @@ alice["height"] # KeyError: 'height'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-legacy-type-variable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L842)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L843)
</small>
**What it does**
@ -771,7 +771,7 @@ def f(t: TypeVar("U")): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-metaclass) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L891)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L892)
</small>
**What it does**
@ -803,7 +803,7 @@ class B(metaclass=f): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-named-tuple) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L498)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L499)
</small>
**What it does**
@ -833,7 +833,7 @@ TypeError: can only inherit from a NamedTuple type and Generic
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-overload) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L918)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L919)
</small>
**What it does**
@ -881,7 +881,7 @@ def foo(x: int) -> int: ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-parameter-default) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L961)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1018)
</small>
**What it does**
@ -905,7 +905,7 @@ def f(a: int = ''): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-protocol) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L435)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L436)
</small>
**What it does**
@ -937,7 +937,7 @@ TypeError: Protocols can only inherit from other protocols, got <class 'int'>
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-raise) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L981)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1038)
</small>
Checks for `raise` statements that raise non-exceptions or use invalid
@ -984,7 +984,7 @@ def g():
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-return-type) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L614)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L615)
</small>
**What it does**
@ -1007,7 +1007,7 @@ def func() -> int:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-super-argument) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1024)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1081)
</small>
**What it does**
@ -1061,7 +1061,7 @@ TODO #14889
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-alias-type) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L870)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L871)
</small>
**What it does**
@ -1086,7 +1086,7 @@ NewAlias = TypeAliasType(get_name(), int) # error: TypeAliasType name mus
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-checking-constant) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1063)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1120)
</small>
**What it does**
@ -1114,7 +1114,7 @@ TYPE_CHECKING = ''
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-form) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1087)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1144)
</small>
**What it does**
@ -1142,7 +1142,7 @@ b: Annotated[int] # `Annotated` expects at least two arguments
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-guard-call) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1139)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1196)
</small>
**What it does**
@ -1174,7 +1174,7 @@ f(10) # Error
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-guard-definition) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1111)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1168)
</small>
**What it does**
@ -1206,7 +1206,7 @@ class C:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-variable-constraints) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1167)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1224)
</small>
**What it does**
@ -1239,7 +1239,7 @@ T = TypeVar('T', bound=str) # valid bound TypeVar
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20missing-argument) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1196)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1253)
</small>
**What it does**
@ -1262,7 +1262,7 @@ func() # TypeError: func() missing 1 required positional argument: 'x'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20missing-typed-dict-key) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1787)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1844)
</small>
**What it does**
@ -1293,7 +1293,7 @@ alice["age"] # KeyError
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20no-matching-overload) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1215)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1272)
</small>
**What it does**
@ -1320,7 +1320,7 @@ func("string") # error: [no-matching-overload]
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20non-subscriptable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1238)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1295)
</small>
**What it does**
@ -1342,7 +1342,7 @@ Subscripting an object that does not support it will raise a `TypeError` at runt
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20not-iterable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1256)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1313)
</small>
**What it does**
@ -1366,7 +1366,7 @@ for i in 34: # TypeError: 'int' object is not iterable
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20parameter-already-assigned) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1307)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1364)
</small>
**What it does**
@ -1391,7 +1391,7 @@ f(1, x=2) # Error raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20positional-only-parameter-as-kwarg) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1542)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1599)
</small>
**What it does**
@ -1445,7 +1445,7 @@ def test(): -> "int":
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20static-assert-error) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1664)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1721)
</small>
**What it does**
@ -1473,7 +1473,7 @@ static_assert(int(2.0 * 3.0) == 6) # error: does not have a statically known tr
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20subclass-of-final-class) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1398)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1455)
</small>
**What it does**
@ -1500,7 +1500,7 @@ class B(A): ... # Error raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20too-many-positional-arguments) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1443)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1500)
</small>
**What it does**
@ -1525,7 +1525,7 @@ f("foo") # Error raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20type-assertion-failure) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1421)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1478)
</small>
**What it does**
@ -1551,7 +1551,7 @@ def _(x: int):
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unavailable-implicit-super-arguments) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1464)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1521)
</small>
**What it does**
@ -1595,7 +1595,7 @@ class A:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unknown-argument) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1521)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1578)
</small>
**What it does**
@ -1620,7 +1620,7 @@ f(x=1, y=2) # Error raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-attribute) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1563)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1620)
</small>
**What it does**
@ -1646,7 +1646,7 @@ A().foo # AttributeError: 'A' object has no attribute 'foo'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-import) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1585)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1642)
</small>
**What it does**
@ -1669,7 +1669,7 @@ import foo # ModuleNotFoundError: No module named 'foo'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-reference) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1604)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1661)
</small>
**What it does**
@ -1692,7 +1692,7 @@ print(x) # NameError: name 'x' is not defined
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-bool-conversion) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1276)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1333)
</small>
**What it does**
@ -1727,7 +1727,7 @@ b1 < b2 < b1 # exception raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-operator) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1623)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1680)
</small>
**What it does**
@ -1753,7 +1753,7 @@ A() + A() # TypeError: unsupported operand type(s) for +: 'A' and 'A'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20zero-stepsize-in-slice) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1645)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1702)
</small>
**What it does**
@ -1776,7 +1776,7 @@ l[1:10:0] # ValueError: slice step cannot be zero
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20ambiguous-protocol-member) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L463)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L464)
</small>
**What it does**
@ -1815,7 +1815,7 @@ class SubProto(BaseProto, Protocol):
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20deprecated) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L279)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L280)
</small>
**What it does**
@ -1868,7 +1868,7 @@ a = 20 / 0 # type: ignore
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-missing-attribute) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1328)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1385)
</small>
**What it does**
@ -1894,7 +1894,7 @@ A.c # AttributeError: type object 'A' has no attribute 'c'
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-missing-implicit-call) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L132)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L133)
</small>
**What it does**
@ -1924,7 +1924,7 @@ A()[0] # TypeError: 'A' object is not subscriptable
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-missing-import) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1350)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1407)
</small>
**What it does**
@ -1954,7 +1954,7 @@ from module import a # ImportError: cannot import name 'a' from 'module'
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20redundant-cast) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1716)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1773)
</small>
**What it does**
@ -1979,7 +1979,7 @@ cast(int, f()) # Redundant
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20undefined-reveal) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1503)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1560)
</small>
**What it does**
@ -2030,7 +2030,7 @@ a = 20 / 0 # ty: ignore[division-by-zero]
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-global) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1737)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1794)
</small>
**What it does**
@ -2084,7 +2084,7 @@ def g():
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-base) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L703)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L704)
</small>
**What it does**
@ -2116,12 +2116,73 @@ class D(C): ... # error: [unsupported-base]
[method resolution order]: https://docs.python.org/3/glossary.html#term-method-resolution-order
## `useless-overload-body`
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20useless-overload-body) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L962)
</small>
**What it does**
Checks for various `@overload`-decorated functions that have non-stub bodies.
**Why is this bad?**
Functions decorated with `@overload` are ignored at runtime; they are overridden
by the implementation function that follows the series of overloads. While it is
not illegal to provide a body for an `@overload`-decorated function, it may indicate
a misunderstanding of how the `@overload` decorator works.
**Example**
```py
from typing import overload
@overload
def foo(x: int) -> int:
return x + 1 # will never be executed
@overload
def foo(x: str) -> str:
return "Oh no, got a string" # will never be executed
def foo(x: int | str) -> int | str:
raise Exception("unexpected type encountered")
```
Use instead:
```py
from typing import assert_never, overload
@overload
def foo(x: int) -> int: ...
@overload
def foo(x: str) -> str: ...
def foo(x: int | str) -> int | str:
if isinstance(x, int):
return x + 1
elif isinstance(x, str):
return "Oh no, got a string"
else:
assert_never(x)
```
**References**
- [Python documentation: `@overload`](https://docs.python.org/3/library/typing.html#typing.overload)
## `division-by-zero`
<small>
Default level: [`ignore`](../rules.md#rule-levels "This lint has a default level of 'ignore'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20division-by-zero) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L261)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L262)
</small>
**What it does**
@ -2143,7 +2204,7 @@ Dividing by zero raises a `ZeroDivisionError` at runtime.
<small>
Default level: [`ignore`](../rules.md#rule-levels "This lint has a default level of 'ignore'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-unresolved-reference) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1376)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1433)
</small>
**What it does**