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## Summary The sub-checks for assignability and subtyping of materializations performed in `has_relation_in_invariant_position` and `is_subtype_in_invariant_position` need to propagate the `HasRelationToVisitor`, or we can stack overflow. A side effect of this change is that we also propagate the `ConstraintSet` through, rather than using `C::from_bool`, which I think may also become important for correctness in cases involving type variables (though it isn't testable yet, since we aren't yet actually creating constraints other than always-true and always-false.) ## Test Plan Added mdtest (derived from code found in pydantic) which stack-overflowed before this PR. With this change incorporated, pydantic now checks successfully on my draft PR for PEP 613 TypeAlias support.
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.