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This PR adds a new `ty_extensions.ConstraintSet` class, which is used to expose constraint sets to our mdtest framework. This lets us write a large collection of unit tests that exercise the invariants and rewrite rules of our constraint set implementation. As part of this, `is_assignable_to` and friends are updated to return a `ConstraintSet` instead of a `bool`, and we implement `ConstraintSet.__bool__` to return when a constraint set is always satisfied. That lets us still use `static_assert(is_assignable_to(...))`, since the assertion will coerce the constraint set to a bool, and also lets us `reveal_type(is_assignable_to(...))` to see more detail about whether/when the two types are assignable. That lets us get rid of `reveal_when_assignable_to` and friends, since they are now redundant with the expanded capabilities of `is_assignable_to`. |
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| .. | ||
| corpus | ||
| mdtest | ||
| primer | ||
| README.md | ||
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.