7dd0c7f4bd
## Summary This PR adds support for heterogenous `tuple` annotations to red-knot. It does the following: - Extends `infer_type_expression` so that it understands tuple annotations - Changes `infer_type_expression` so that `ExprStarred` nodes in type annotations are inferred as `Todo` rather than `Unknown` (they're valid in PEP-646 tuple annotations) - Extends `Type::is_subtype_of` to understand when one heterogenous tuple type can be understood to be a subtype of another (without this change, the PR would have introduced new false-positive errors to some existing mdtests).
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.