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ruff/crates/ty_python_semantic/resources
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David Peter b8dec79182
[ty] Implicit instance attributes declared Final (#19462) 
## Summary

Adds proper type inference for implicit instance attributes that are
declared with a "bare" `Final` and adds `invalid-assignment` diagnostics
for all implicit instance attributes that are declared `Final` or
`Final[…]`.

## Test Plan

New and updated MD tests.

## Ecosystem analysis

```diff
pytest (https://github.com/pytest-dev/pytest)
+ error[invalid-return-type] src/_pytest/fixtures.py:1662:24: Return type does not match returned value: expected `Scope`, found `Scope | (Unknown & ~None & ~((...) -> object) & ~str) | (((str, Config, /) -> Unknown) & ~((...) -> object) & ~str) | (Unknown & ~str)
```

The definition of the `scope` attribute is [here](

5f99385635/src/_pytest/fixtures.py (L1020-L1028)).
Looks like this is a new false positive due to missing `TypeAlias`
support that is surfaced here because we now infer a more precise type
for `FixtureDef._scope`.
2025-07-21 20:01:07 +02:00
..
corpus [ty] Fix panic for attribute expressions with empty value (#19069) 2025-07-09 08:46:33 +02:00
mdtest [ty] Implicit instance attributes declared Final (#19462) 2025-07-21 20:01:07 +02:00
primer [ty] Upgrade mypy_primer (#19207) 2025-07-08 15:56:54 +01:00
README.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00

README.md

Markdown files within the mdtest/ subdirectory are tests of type inference and type checking; executed by the tests/mdtest.rs integration test.

See crates/ty_test/README.md for documentation of this test format.