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## Summary Supports return type inference for, e.g., `def f() -> int | None:`. --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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.