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## 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. |
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| .. | ||
| module_resolver | ||
| semantic_index | ||
| types | ||
| util | ||
| ast_node_ref.rs | ||
| db.rs | ||
| lib.rs | ||
| lint.rs | ||
| list.rs | ||
| module_name.rs | ||
| node_key.rs | ||
| program.rs | ||
| python_platform.rs | ||
| semantic_index.rs | ||
| semantic_model.rs | ||
| site_packages.rs | ||
| suppression.rs | ||
| symbol.rs | ||
| types.rs | ||
| unpack.rs | ||