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Shunsuke Shibayama bb44926ca5
[red-knot] Add rule invalid-type-checking-constant (#16501) 
## Summary

This PR adds more features to #16468.

* Adds a new error rule `invalid-type-checking-constant`, which occurs
when we try to assign a value other than `False` to a user-defined
`TYPE_CHECKING` variable (it is possible to assign `...` in a stub
file).
* Allows annotated assignment to `TYPE_CHECKING`. Only types that
`False` can be assigned to are allowed. However, the type of
`TYPE_CHECKING` will be inferred to be `Literal[True]` regardless of
what the type is specified.

## Test plan

I ran the tests with `cargo test -p red_knot_python_semantic` and
confirmed that all tests passed.

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
2025-03-04 19:49:34 +00:00
..
mdtest [red-knot] Add rule invalid-type-checking-constant (#16501) 2025-03-04 19:49:34 +00:00
README.md [red-knot] document test framework (#13695) 2024-10-10 12:02:01 -07:00

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/red_knot_test/README.md for documentation of this test format.