<!-- Thank you for contributing to Ruff! To help us out with reviewing, please consider the following: - Does this pull request include a summary of the change? (See below.) - Does this pull request include a descriptive title? - Does this pull request include references to any relevant issues? --> ## Summary - Remove `Type::Unbound` - Handle (potential) unboundness as a concept orthogonal to the type system (see new `Symbol` type) - Improve existing and add new diagnostics related to (potential) unboundness closes #13671 ## Test Plan - Update existing markdown-based tests - Add new tests for added/modified functionality
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.