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[ty] Emit a diagnostic when frozen dataclass inherits a non-frozen dataclass and the other way around (#21962) 

Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
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Simon Lamon 2025-12-13 21:59:26 +01:00 committed by GitHub
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9 changed files with 537 additions and 84 deletions
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@ -39,7 +39,7 @@ def test(): -> "int":
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20call-non-callable" target="_blank">Related issues</a> ·
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<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L135" target="_blank">View source</a>
</small>
@ -63,7 +63,7 @@ Calling a non-callable object will raise a `TypeError` at runtime.
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
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</small>
@ -95,7 +95,7 @@ f(int) # error
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
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</small>
@ -126,7 +126,7 @@ a = 1
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
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</small>
@ -158,7 +158,7 @@ class C(A, B): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20cyclic-class-definition" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L255" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L256" target="_blank">View source</a>
</small>
@ -190,7 +190,7 @@ class B(A): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Preview (since <a href="https://github.com/astral-sh/ty/releases/tag/1.0.0">1.0.0</a>) ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20cyclic-type-alias-definition" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L281" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L282" target="_blank">View source</a>
</small>
@ -218,7 +218,7 @@ type B = A
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20duplicate-base" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L342" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L343" target="_blank">View source</a>
</small>
@ -245,7 +245,7 @@ class B(A, A): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.12">0.0.1-alpha.12</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20duplicate-kw-only" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L363" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L364" target="_blank">View source</a>
</small>
@ -357,7 +357,7 @@ def test(): -> "Literal[5]":
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20inconsistent-mro" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L589" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L590" target="_blank">View source</a>
</small>
@ -387,7 +387,7 @@ class C(A, B): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20index-out-of-bounds" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L613" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L614" target="_blank">View source</a>
</small>
@ -413,7 +413,7 @@ t[3] # IndexError: tuple index out of range
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.12">0.0.1-alpha.12</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20instance-layout-conflict" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L395" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L396" target="_blank">View source</a>
</small>
@ -502,7 +502,7 @@ an atypical memory layout.
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-argument-type" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L667" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L668" target="_blank">View source</a>
</small>
@ -529,7 +529,7 @@ func("foo") # error: [invalid-argument-type]
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-assignment" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L707" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L708" target="_blank">View source</a>
</small>
@ -557,7 +557,7 @@ a: int = ''
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-attribute-access" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1997" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1998" target="_blank">View source</a>
</small>
@ -591,7 +591,7 @@ C.instance_var = 3 # error: Cannot assign to instance variable
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.19">0.0.1-alpha.19</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-await" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L729" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L730" target="_blank">View source</a>
</small>
@ -627,7 +627,7 @@ asyncio.run(main())
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-base" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L759" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L760" target="_blank">View source</a>
</small>
@ -651,7 +651,7 @@ class A(42): ... # error: [invalid-base]
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-context-manager" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L810" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L811" target="_blank">View source</a>
</small>
@ -678,7 +678,7 @@ with 1:
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-declaration" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L831" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L832" target="_blank">View source</a>
</small>
@ -707,7 +707,7 @@ a: str
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-exception-caught" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L854" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L855" target="_blank">View source</a>
</small>
@ -751,7 +751,7 @@ except ZeroDivisionError:
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.28">0.0.1-alpha.28</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-explicit-override" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1667" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1668" target="_blank">View source</a>
</small>
@ -787,13 +787,57 @@ class D(A):
def foo(self): ... # fine: overrides `A.foo`
```
## `invalid-frozen-dataclass-subclass`
<small>
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.35">0.0.1-alpha.35</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-frozen-dataclass-subclass" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2224" target="_blank">View source</a>
</small>
**What it does**
Checks for dataclasses with invalid frozen inheritance:
- A frozen dataclass cannot inherit from a non-frozen dataclass.
- A non-frozen dataclass cannot inherit from a frozen dataclass.
**Why is this bad?**
Python raises a `TypeError` at runtime when either of these inheritance
patterns occurs.
**Example**
```python
from dataclasses import dataclass
@dataclass
class Base:
x: int
@dataclass(frozen=True)
class Child(Base): # Error raised here
y: int
@dataclass(frozen=True)
class FrozenBase:
x: int
@dataclass
class NonFrozenChild(FrozenBase): # Error raised here
y: int
```
## `invalid-generic-class`
<small>
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-generic-class" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L890" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L891" target="_blank">View source</a>
</small>
@ -826,7 +870,7 @@ class C[U](Generic[T]): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.17">0.0.1-alpha.17</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-key" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L634" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L635" target="_blank">View source</a>
</small>
@ -865,7 +909,7 @@ carol = Person(name="Carol", age=25) # typo!
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-legacy-type-variable" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L916" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L917" target="_blank">View source</a>
</small>
@ -900,7 +944,7 @@ def f(t: TypeVar("U")): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-metaclass" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1013" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1014" target="_blank">View source</a>
</small>
@ -934,7 +978,7 @@ class B(metaclass=f): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.20">0.0.1-alpha.20</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-method-override" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2125" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2126" target="_blank">View source</a>
</small>
@ -1041,7 +1085,7 @@ Correct use of `@override` is enforced by ty's `invalid-explicit-override` rule.
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.19">0.0.1-alpha.19</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-named-tuple" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L541" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L542" target="_blank">View source</a>
</small>
@ -1095,7 +1139,7 @@ AttributeError: Cannot overwrite NamedTuple attribute _asdict
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Preview (since <a href="https://github.com/astral-sh/ty/releases/tag/1.0.0">1.0.0</a>) ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-newtype" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L989" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L990" target="_blank">View source</a>
</small>
@ -1125,7 +1169,7 @@ Baz = NewType("Baz", int | str) # error: invalid base for `typing.NewType`
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-overload" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1040" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1041" target="_blank">View source</a>
</small>
@ -1175,7 +1219,7 @@ def foo(x: int) -> int: ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-parameter-default" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1139" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1140" target="_blank">View source</a>
</small>
@ -1201,7 +1245,7 @@ def f(a: int = ''): ...
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-paramspec" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L944" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L945" target="_blank">View source</a>
</small>
@ -1232,7 +1276,7 @@ P2 = ParamSpec("S2") # error: ParamSpec name must match the variable it's assig
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-protocol" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L477" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L478" target="_blank">View source</a>
</small>
@ -1266,7 +1310,7 @@ TypeError: Protocols can only inherit from other protocols, got <class 'int'>
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-raise" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1159" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1160" target="_blank">View source</a>
</small>
@ -1315,7 +1359,7 @@ def g():
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-return-type" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L688" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L689" target="_blank">View source</a>
</small>
@ -1340,7 +1384,7 @@ def func() -> int:
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-super-argument" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1202" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1203" target="_blank">View source</a>
</small>
@ -1398,7 +1442,7 @@ TODO #14889
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.6">0.0.1-alpha.6</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-alias-type" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L968" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L969" target="_blank">View source</a>
</small>
@ -1425,7 +1469,7 @@ NewAlias = TypeAliasType(get_name(), int) # error: TypeAliasType name mus
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.29">0.0.1-alpha.29</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-arguments" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1434" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1435" target="_blank">View source</a>
</small>
@ -1472,7 +1516,7 @@ Bar[int] # error: too few arguments
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-checking-constant" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1241" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1242" target="_blank">View source</a>
</small>
@ -1502,7 +1546,7 @@ TYPE_CHECKING = ''
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-form" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1265" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1266" target="_blank">View source</a>
</small>
@ -1532,7 +1576,7 @@ b: Annotated[int] # `Annotated` expects at least two arguments
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.11">0.0.1-alpha.11</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-guard-call" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1317" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1318" target="_blank">View source</a>
</small>
@ -1566,7 +1610,7 @@ f(10) # Error
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.11">0.0.1-alpha.11</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-guard-definition" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1289" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1290" target="_blank">View source</a>
</small>
@ -1600,7 +1644,7 @@ class C:
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-variable-constraints" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1345" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1346" target="_blank">View source</a>
</small>
@ -1635,7 +1679,7 @@ T = TypeVar('T', bound=str) # valid bound TypeVar
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20missing-argument" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1374" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1375" target="_blank">View source</a>
</small>
@ -1660,7 +1704,7 @@ func() # TypeError: func() missing 1 required positional argument: 'x'
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.20">0.0.1-alpha.20</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20missing-typed-dict-key" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2098" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2099" target="_blank">View source</a>
</small>
@ -1693,7 +1737,7 @@ alice["age"] # KeyError
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20no-matching-overload" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1393" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1394" target="_blank">View source</a>
</small>
@ -1722,7 +1766,7 @@ func("string") # error: [no-matching-overload]
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20non-subscriptable" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1416" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1417" target="_blank">View source</a>
</small>
@ -1746,7 +1790,7 @@ Subscripting an object that does not support it will raise a `TypeError` at runt
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20not-iterable" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1475" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1476" target="_blank">View source</a>
</small>
@ -1772,7 +1816,7 @@ for i in 34: # TypeError: 'int' object is not iterable
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.29">0.0.1-alpha.29</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20override-of-final-method" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1640" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1641" target="_blank">View source</a>
</small>
@ -1805,7 +1849,7 @@ class B(A):
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20parameter-already-assigned" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1526" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1527" target="_blank">View source</a>
</small>
@ -1832,7 +1876,7 @@ f(1, x=2) # Error raised here
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.22">0.0.1-alpha.22</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20positional-only-parameter-as-kwarg" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1851" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1852" target="_blank">View source</a>
</small>
@ -1890,7 +1934,7 @@ def test(): -> "int":
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20static-assert-error" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1973" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1974" target="_blank">View source</a>
</small>
@ -1920,7 +1964,7 @@ static_assert(int(2.0 * 3.0) == 6) # error: does not have a statically known tr
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20subclass-of-final-class" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1617" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1618" target="_blank">View source</a>
</small>
@ -1949,7 +1993,7 @@ class B(A): ... # Error raised here
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Preview (since <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.30">0.0.1-alpha.30</a>) ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20super-call-in-named-tuple-method" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1785" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1786" target="_blank">View source</a>
</small>
@ -1983,7 +2027,7 @@ class F(NamedTuple):
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20too-many-positional-arguments" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1725" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1726" target="_blank">View source</a>
</small>
@ -2010,7 +2054,7 @@ f("foo") # Error raised here
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20type-assertion-failure" target="_blank">Related issues</a> ·
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</small>
@ -2038,7 +2082,7 @@ def _(x: int):
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unavailable-implicit-super-arguments" target="_blank">Related issues</a> ·
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</small>
@ -2084,7 +2128,7 @@ class A:
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unknown-argument" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1830" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1831" target="_blank">View source</a>
</small>
@ -2111,7 +2155,7 @@ f(x=1, y=2) # Error raised here
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-attribute" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1872" target="_blank">View source</a>
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</small>
@ -2139,7 +2183,7 @@ A().foo # AttributeError: 'A' object has no attribute 'foo'
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-import" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1894" target="_blank">View source</a>
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</small>
@ -2164,7 +2208,7 @@ import foo # ModuleNotFoundError: No module named 'foo'
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-reference" target="_blank">Related issues</a> ·
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</small>
@ -2189,7 +2233,7 @@ print(x) # NameError: name 'x' is not defined
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-bool-conversion" target="_blank">Related issues</a> ·
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</small>
@ -2226,7 +2270,7 @@ b1 < b2 < b1 # exception raised here
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-operator" target="_blank">Related issues</a> ·
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<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1933" target="_blank">View source</a>
</small>
@ -2254,7 +2298,7 @@ A() + A() # TypeError: unsupported operand type(s) for +: 'A' and 'A'
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'error'."><code>error</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20zero-stepsize-in-slice" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1954" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1955" target="_blank">View source</a>
</small>
@ -2279,7 +2323,7 @@ l[1:10:0] # ValueError: slice step cannot be zero
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.20">0.0.1-alpha.20</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20ambiguous-protocol-member" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L506" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L507" target="_blank">View source</a>
</small>
@ -2320,7 +2364,7 @@ class SubProto(BaseProto, Protocol):
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.16">0.0.1-alpha.16</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20deprecated" target="_blank">Related issues</a> ·
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</small>
@ -2408,7 +2452,7 @@ a = 20 / 0 # type: ignore
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.22">0.0.1-alpha.22</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-missing-attribute" target="_blank">Related issues</a> ·
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</small>
@ -2436,7 +2480,7 @@ A.c # AttributeError: type object 'A' has no attribute 'c'
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.22">0.0.1-alpha.22</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-missing-implicit-call" target="_blank">Related issues</a> ·
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<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L153" target="_blank">View source</a>
</small>
@ -2468,7 +2512,7 @@ A()[0] # TypeError: 'A' object is not subscriptable
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.22">0.0.1-alpha.22</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-missing-import" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1569" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1570" target="_blank">View source</a>
</small>
@ -2500,7 +2544,7 @@ from module import a # ImportError: cannot import name 'a' from 'module'
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20redundant-cast" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2025" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2026" target="_blank">View source</a>
</small>
@ -2527,7 +2571,7 @@ cast(int, f()) # Redundant
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20undefined-reveal" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1812" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1813" target="_blank">View source</a>
</small>
@ -2551,7 +2595,7 @@ reveal_type(1) # NameError: name 'reveal_type' is not defined
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.15">0.0.1-alpha.15</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-global" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2046" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L2047" target="_blank">View source</a>
</small>
@ -2609,7 +2653,7 @@ def g():
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.7">0.0.1-alpha.7</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-base" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L777" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L778" target="_blank">View source</a>
</small>
@ -2648,7 +2692,7 @@ class D(C): ... # error: [unsupported-base]
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'warn'."><code>warn</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.22">0.0.1-alpha.22</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20useless-overload-body" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1083" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1084" target="_blank">View source</a>
</small>
@ -2711,7 +2755,7 @@ def foo(x: int | str) -> int | str:
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'ignore'."><code>ignore</code></a> ·
Preview (since <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a>) ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20division-by-zero" target="_blank">Related issues</a> ·
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L303" target="_blank">View source</a>
<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L304" target="_blank">View source</a>
</small>
@ -2735,7 +2779,7 @@ Dividing by zero raises a `ZeroDivisionError` at runtime.
Default level: <a href="../rules.md#rule-levels" title="This lint has a default level of 'ignore'."><code>ignore</code></a> ·
Added in <a href="https://github.com/astral-sh/ty/releases/tag/0.0.1-alpha.1">0.0.1-alpha.1</a> ·
<a href="https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-unresolved-reference" target="_blank">Related issues</a> ·
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<a href="https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1596" target="_blank">View source</a>
</small>

67
crates/ty_python_semantic/resources/mdtest/dataclasses/dataclasses.md
View File

@ -521,6 +521,73 @@ frozen = MyFrozenChildClass()
del frozen.x # TODO this should emit an [invalid-assignment]
```
### frozen/non-frozen inheritance
If a non-frozen dataclass inherits from a frozen dataclass, an exception is raised at runtime. We
catch this error:
<!-- snapshot-diagnostics -->
`a.py`:
```py
from dataclasses import dataclass
@dataclass(frozen=True)
class FrozenBase:
x: int
@dataclass
# error: [invalid-frozen-dataclass-subclass] "Non-frozen dataclass `Child` cannot inherit from frozen dataclass `FrozenBase`"
class Child(FrozenBase):
y: int
```
Frozen dataclasses inheriting from non-frozen dataclasses are also illegal:
`b.py`:
```py
from dataclasses import dataclass
@dataclass
class Base:
x: int
@dataclass(frozen=True)
# error: [invalid-frozen-dataclass-subclass] "Frozen dataclass `FrozenChild` cannot inherit from non-frozen dataclass `Base`"
class FrozenChild(Base):
y: int
```
Example of diagnostics when there are multiple files involved:
`module.py`:
```py
import dataclasses
@dataclasses.dataclass(frozen=False)
class NotFrozenBase:
x: int
```
`main.py`:
```py
from functools import total_ordering
from typing import final
from dataclasses import dataclass
from module import NotFrozenBase
@final
@dataclass(frozen=True)
@total_ordering
class FrozenChild(NotFrozenBase): # error: [invalid-frozen-dataclass-subclass]
y: str
```
### `match_args`
If `match_args` is set to `True` (the default), the `__match_args__` attribute is a tuple created

154
crates/ty_python_semantic/resources/mdtest/snapshots/dataclasses.md_-_Dataclasses_-_Other_dataclass_para…_-_frozen__non-frozen_in…_(9af2ab07b8e829e).snap Normal file
View File

@ -0,0 +1,154 @@
---
source: crates/ty_test/src/lib.rs
expression: snapshot
---
---
mdtest name: dataclasses.md - Dataclasses - Other dataclass parameters - frozen/non-frozen inheritance
mdtest path: crates/ty_python_semantic/resources/mdtest/dataclasses/dataclasses.md
---
# Python source files
## a.py
```
1 | from dataclasses import dataclass
2 |
3 | @dataclass(frozen=True)
4 | class FrozenBase:
5 | x: int
6 |
7 | @dataclass
8 | # error: [invalid-frozen-dataclass-subclass] "Non-frozen dataclass `Child` cannot inherit from frozen dataclass `FrozenBase`"
9 | class Child(FrozenBase):
10 | y: int
```
## b.py
```
1 | from dataclasses import dataclass
2 |
3 | @dataclass
4 | class Base:
5 | x: int
6 |
7 | @dataclass(frozen=True)
8 | # error: [invalid-frozen-dataclass-subclass] "Frozen dataclass `FrozenChild` cannot inherit from non-frozen dataclass `Base`"
9 | class FrozenChild(Base):
10 | y: int
```
## module.py
```
1 | import dataclasses
2 |
3 | @dataclasses.dataclass(frozen=False)
4 | class NotFrozenBase:
5 | x: int
```
## main.py
```
1 | from functools import total_ordering
2 | from typing import final
3 | from dataclasses import dataclass
4 |
5 | from module import NotFrozenBase
6 |
7 | @final
8 | @dataclass(frozen=True)
9 | @total_ordering
10 | class FrozenChild(NotFrozenBase): # error: [invalid-frozen-dataclass-subclass]
11 | y: str
```
# Diagnostics
```
error[invalid-frozen-dataclass-subclass]: Non-frozen dataclass cannot inherit from frozen dataclass
--> src/a.py:7:1
|
5 | x: int
6 |
7 | @dataclass
| ---------- `Child` dataclass parameters
8 | # error: [invalid-frozen-dataclass-subclass] "Non-frozen dataclass `Child` cannot inherit from frozen dataclass `FrozenBase`"
9 | class Child(FrozenBase):
| ^^^^^^----------^ Subclass `Child` is not frozen but base class `FrozenBase` is
10 | y: int
|
info: This causes the class creation to fail
info: Base class definition
--> src/a.py:3:1
|
1 | from dataclasses import dataclass
2 |
3 | @dataclass(frozen=True)
| ----------------------- `FrozenBase` dataclass parameters
4 | class FrozenBase:
| ^^^^^^^^^^ `FrozenBase` definition
5 | x: int
|
info: rule `invalid-frozen-dataclass-subclass` is enabled by default
```
```
error[invalid-frozen-dataclass-subclass]: Frozen dataclass cannot inherit from non-frozen dataclass
--> src/b.py:7:1
|
5 | x: int
6 |
7 | @dataclass(frozen=True)
| ----------------------- `FrozenChild` dataclass parameters
8 | # error: [invalid-frozen-dataclass-subclass] "Frozen dataclass `FrozenChild` cannot inherit from non-frozen dataclass `Base`"
9 | class FrozenChild(Base):
| ^^^^^^^^^^^^----^ Subclass `FrozenChild` is frozen but base class `Base` is not
10 | y: int
|
info: This causes the class creation to fail
info: Base class definition
--> src/b.py:3:1
|
1 | from dataclasses import dataclass
2 |
3 | @dataclass
| ---------- `Base` dataclass parameters
4 | class Base:
| ^^^^ `Base` definition
5 | x: int
|
info: rule `invalid-frozen-dataclass-subclass` is enabled by default
```
```
error[invalid-frozen-dataclass-subclass]: Frozen dataclass cannot inherit from non-frozen dataclass
--> src/main.py:8:1
|
7 | @final
8 | @dataclass(frozen=True)
| ----------------------- `FrozenChild` dataclass parameters
9 | @total_ordering
10 | class FrozenChild(NotFrozenBase): # error: [invalid-frozen-dataclass-subclass]
| ^^^^^^^^^^^^-------------^ Subclass `FrozenChild` is frozen but base class `NotFrozenBase` is not
11 | y: str
|
info: This causes the class creation to fail
info: Base class definition
--> src/module.py:3:1
|
1 | import dataclasses
2 |
3 | @dataclasses.dataclass(frozen=False)
| ------------------------------------ `NotFrozenBase` dataclass parameters
4 | class NotFrozenBase:
| ^^^^^^^^^^^^^ `NotFrozenBase` definition
5 | x: int
|
info: rule `invalid-frozen-dataclass-subclass` is enabled by default
```

6
crates/ty_python_semantic/src/types.rs
View File

@ -677,6 +677,12 @@ bitflags! {
}
}
impl DataclassFlags {
pub(crate) const fn is_frozen(self) -> bool {
self.contains(Self::FROZEN)
}
}
pub(crate) const DATACLASS_FLAGS: &[(&str, DataclassFlags)] = &[
("init", DataclassFlags::INIT),
("repr", DataclassFlags::REPR),

22
crates/ty_python_semantic/src/types/class.rs
View File

@ -1856,6 +1856,28 @@ impl<'db> ClassLiteral<'db> {
.filter_map(|decorator| decorator.known(db))
}
/// Iterate through the decorators on this class, returning the position of the first one
/// that matches the given predicate.
pub(super) fn find_decorator_position(
self,
db: &'db dyn Db,
predicate: impl Fn(Type<'db>) -> bool,
) -> Option<usize> {
self.decorators(db)
.iter()
.position(|decorator| predicate(*decorator))
}
/// Iterate through the decorators on this class, returning the index of the first one
/// that is either `@dataclass` or `@dataclass(...)`.
pub(super) fn find_dataclass_decorator_position(self, db: &'db dyn Db) -> Option<usize> {
self.find_decorator_position(db, |ty| match ty {
Type::FunctionLiteral(function) => function.is_known(db, KnownFunction::Dataclass),
Type::DataclassDecorator(_) => true,
_ => false,
})
}
/// Is this class final?
pub(super) fn is_final(self, db: &'db dyn Db) -> bool {
self.known_function_decorators(db)

129
crates/ty_python_semantic/src/types/diagnostic.rs
View File

@ -30,7 +30,7 @@ use crate::types::{
ProtocolInstanceType, SpecialFormType, SubclassOfInner, Type, TypeContext, binding_type,
protocol_class::ProtocolClass,
};
use crate::types::{KnownInstanceType, MemberLookupPolicy};
use crate::types::{DataclassFlags, KnownInstanceType, MemberLookupPolicy};
use crate::{Db, DisplaySettings, FxIndexMap, Module, ModuleName, Program, declare_lint};
use itertools::Itertools;
use ruff_db::{
@ -121,6 +121,7 @@ pub(crate) fn register_lints(registry: &mut LintRegistryBuilder) {
registry.register_lint(&INVALID_METHOD_OVERRIDE);
registry.register_lint(&INVALID_EXPLICIT_OVERRIDE);
registry.register_lint(&SUPER_CALL_IN_NAMED_TUPLE_METHOD);
registry.register_lint(&INVALID_FROZEN_DATACLASS_SUBCLASS);
// String annotations
registry.register_lint(&BYTE_STRING_TYPE_ANNOTATION);
@ -2220,6 +2221,44 @@ declare_lint! {
}
}
declare_lint! {
/// ## What it does
/// Checks for dataclasses with invalid frozen inheritance:
/// - A frozen dataclass cannot inherit from a non-frozen dataclass.
/// - A non-frozen dataclass cannot inherit from a frozen dataclass.
///
/// ## Why is this bad?
/// Python raises a `TypeError` at runtime when either of these inheritance
/// patterns occurs.
///
/// ## Example
///
/// ```python
/// from dataclasses import dataclass
///
/// @dataclass
/// class Base:
/// x: int
///
/// @dataclass(frozen=True)
/// class Child(Base): # Error raised here
/// y: int
///
/// @dataclass(frozen=True)
/// class FrozenBase:
/// x: int
///
/// @dataclass
/// class NonFrozenChild(FrozenBase): # Error raised here
/// y: int
/// ```
pub(crate) static INVALID_FROZEN_DATACLASS_SUBCLASS = {
summary: "detects dataclasses with invalid frozen/non-frozen subclassing",
status: LintStatus::stable("0.0.1-alpha.35"),
default_level: Level::Error,
}
}
/// A collection of type check diagnostics.
#[derive(Default, Eq, PartialEq, get_size2::GetSize)]
pub struct TypeCheckDiagnostics {
@ -4269,6 +4308,94 @@ fn report_unsupported_binary_operation_impl<'a>(
Some(diagnostic)
}
pub(super) fn report_bad_frozen_dataclass_inheritance<'db>(
context: &InferContext<'db, '_>,
class: ClassLiteral<'db>,
class_node: &ast::StmtClassDef,
base_class: ClassLiteral<'db>,
base_class_node: &ast::Expr,
base_class_params: DataclassFlags,
) {
let db = context.db();
let Some(builder) =
context.report_lint(&INVALID_FROZEN_DATACLASS_SUBCLASS, class.header_range(db))
else {
return;
};
let mut diagnostic = if base_class_params.is_frozen() {
let mut diagnostic =
builder.into_diagnostic("Non-frozen dataclass cannot inherit from frozen dataclass");
diagnostic.set_concise_message(format_args!(
"Non-frozen dataclass `{}` cannot inherit from frozen dataclass `{}`",
class.name(db),
base_class.name(db)
));
diagnostic.set_primary_message(format_args!(
"Subclass `{}` is not frozen but base class `{}` is",
class.name(db),
base_class.name(db)
));
diagnostic
} else {
let mut diagnostic =
builder.into_diagnostic("Frozen dataclass cannot inherit from non-frozen dataclass");
diagnostic.set_concise_message(format_args!(
"Frozen dataclass `{}` cannot inherit from non-frozen dataclass `{}`",
class.name(db),
base_class.name(db)
));
diagnostic.set_primary_message(format_args!(
"Subclass `{}` is frozen but base class `{}` is not",
class.name(db),
base_class.name(db)
));
diagnostic
};
diagnostic.annotate(context.secondary(base_class_node));
if let Some(position) = class.find_dataclass_decorator_position(db) {
diagnostic.annotate(
context
.secondary(&class_node.decorator_list[position])
.message(format_args!("`{}` dataclass parameters", class.name(db))),
);
}
diagnostic.info("This causes the class creation to fail");
if let Some(decorator_position) = base_class.find_dataclass_decorator_position(db) {
let mut sub = SubDiagnostic::new(
SubDiagnosticSeverity::Info,
format_args!("Base class definition"),
);
sub.annotate(
Annotation::primary(base_class.header_span(db))
.message(format_args!("`{}` definition", base_class.name(db))),
);
let base_class_file = base_class.file(db);
let module = parsed_module(db, base_class_file).load(db);
let decorator_range = base_class
.body_scope(db)
.node(db)
.expect_class()
.node(&module)
.decorator_list[decorator_position]
.range();
sub.annotate(
Annotation::secondary(Span::from(base_class_file).with_range(decorator_range)).message(
format_args!("`{}` dataclass parameters", base_class.name(db)),
),
);
diagnostic.sub(sub);
}
}
/// This function receives an unresolved `from foo import bar` import,
/// where `foo` can be resolved to a module but that module does not
/// have a `bar` member or submodule.

40
crates/ty_python_semantic/src/types/infer/builder.rs
View File

@ -69,15 +69,16 @@ use crate::types::diagnostic::{
UNRESOLVED_IMPORT, UNRESOLVED_REFERENCE, UNSUPPORTED_OPERATOR, USELESS_OVERLOAD_BODY,
hint_if_stdlib_attribute_exists_on_other_versions,
hint_if_stdlib_submodule_exists_on_other_versions, report_attempted_protocol_instantiation,
report_bad_dunder_set_call, report_cannot_pop_required_field_on_typed_dict,
report_duplicate_bases, report_implicit_return_type, report_index_out_of_bounds,
report_instance_layout_conflict, report_invalid_arguments_to_annotated,
report_invalid_assignment, report_invalid_attribute_assignment,
report_invalid_exception_caught, report_invalid_exception_cause,
report_invalid_exception_raised, report_invalid_exception_tuple_caught,
report_invalid_generator_function_return_type, report_invalid_key_on_typed_dict,
report_invalid_or_unsupported_base, report_invalid_return_type,
report_invalid_type_checking_constant, report_named_tuple_field_with_leading_underscore,
report_bad_dunder_set_call, report_bad_frozen_dataclass_inheritance,
report_cannot_pop_required_field_on_typed_dict, report_duplicate_bases,
report_implicit_return_type, report_index_out_of_bounds, report_instance_layout_conflict,
report_invalid_arguments_to_annotated, report_invalid_assignment,
report_invalid_attribute_assignment, report_invalid_exception_caught,
report_invalid_exception_cause, report_invalid_exception_raised,
report_invalid_exception_tuple_caught, report_invalid_generator_function_return_type,
report_invalid_key_on_typed_dict, report_invalid_or_unsupported_base,
report_invalid_return_type, report_invalid_type_checking_constant,
report_named_tuple_field_with_leading_underscore,
report_namedtuple_field_without_default_after_field_with_default, report_non_subscriptable,
report_possibly_missing_attribute, report_possibly_unresolved_reference,
report_rebound_typevar, report_slice_step_size_zero, report_unsupported_augmented_assignment,
@ -755,6 +756,27 @@ impl<'db, 'ast> TypeInferenceBuilder<'db, 'ast> {
));
}
}
let (base_class_literal, _) = base_class.class_literal(self.db());
if let (Some(base_params), Some(class_params)) = (
base_class_literal.dataclass_params(self.db()),
class.dataclass_params(self.db()),
) {
let base_params = base_params.flags(self.db());
let class_is_frozen = class_params.flags(self.db()).is_frozen();
if base_params.is_frozen() != class_is_frozen {
report_bad_frozen_dataclass_inheritance(
&self.context,
class,
class_node,
base_class_literal,
&class_node.bases()[i],
base_params,
);
}
}
}
// (4) Check that the class's MRO is resolvable

1
crates/ty_server/tests/e2e/snapshots/e2e__commands__debug_command.snap
View File

@ -55,6 +55,7 @@ Settings: Settings {
"invalid-declaration": Error (Default),
"invalid-exception-caught": Error (Default),
"invalid-explicit-override": Error (Default),
"invalid-frozen-dataclass-subclass": Error (Default),
"invalid-generic-class": Error (Default),
"invalid-ignore-comment": Warning (Default),
"invalid-key": Error (Default),

10
ty.schema.json generated
View File

@ -583,6 +583,16 @@
}
]
},
"invalid-frozen-dataclass-subclass": {
"title": "detects dataclasses with invalid frozen/non-frozen subclassing",
"description": "## What it does\nChecks for dataclasses with invalid frozen inheritance:\n- A frozen dataclass cannot inherit from a non-frozen dataclass.\n- A non-frozen dataclass cannot inherit from a frozen dataclass.\n\n## Why is this bad?\nPython raises a `TypeError` at runtime when either of these inheritance\npatterns occurs.\n\n## Example\n\n```python\nfrom dataclasses import dataclass\n\n@dataclass\nclass Base:\n x: int\n\n@dataclass(frozen=True)\nclass Child(Base): # Error raised here\n y: int\n\n@dataclass(frozen=True)\nclass FrozenBase:\n x: int\n\n@dataclass\nclass NonFrozenChild(FrozenBase): # Error raised here\n y: int\n```",
"default": "error",
"oneOf": [
{
"$ref": "#/definitions/Level"
}
]
},
"invalid-generic-class": {
"title": "detects invalid generic classes",
"description": "## What it does\nChecks for the creation of invalid generic classes\n\n## Why is this bad?\nThere are several requirements that you must follow when defining a generic class.\n\n## Examples\n```python\nfrom typing import Generic, TypeVar\n\nT = TypeVar(\"T\") # okay\n\n# error: class uses both PEP-695 syntax and legacy syntax\nclass C[U](Generic[T]): ...\n```\n\n## References\n- [Typing spec: Generics](https://typing.python.org/en/latest/spec/generics.html#introduction)",