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The `Display` implementation for constraint sets is brittle, and deserves a rethink. But later! It's perfectly fine for printf debugging; we just shouldn't be writing mdtests that depend on any particular rendering details. Most of these tests can be replaced with an equivalence check that actually validates that the _behavior_ of two constraint sets are identical.
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.