David Peter b662c3ff7e [red-knot] Add support for assert_never (#17287) ... ## Summary We already have partial "support" for `assert_never`, because it is annotated as ```pyi def assert_never(arg: Never, /) -> Never: ... ``` in typeshed. So we already emit a `invalid-argument-type` diagnostic if the argument type to `assert_never` is not assignable to `Never`. That is not enough, however. Gradual types like `Any`, `Unknown`, `@Todo(…)` or `Any & int` can be assignable to `Never`. Which means that we didn't issue any diagnostic in those cases. Also, it seems like `assert_never` deserves a dedicated diagnostic message, not just a generic "invalid argument type" error. ## Test Plan New Markdown tests.		2025-04-08 09:31:49 +02:00
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assert_never.md	[red-knot] Add support for assert_never (#17287)	2025-04-08 09:31:49 +02:00
assert_type.md	[red-knot] Add missing imports in mdtests (#15869)	2025-02-03 09:27:29 +00:00
cast.md	[red-knot] Fix more [redundant-cast] false positives (#17170)	2025-04-03 15:00:00 +01:00