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This PR adds the new **_constraint implication_** relationship between types, aka `is_subtype_of_given`, which tests whether one type is a subtype of another _assuming that the constraints in a particular constraint set hold_. For concrete types, constraint implication is exactly the same as subtyping. (A concrete type is any fully static type that is not a typevar. It can _contain_ a typevar, though — `list[T]` is considered concrete.) The interesting case is typevars. The other typing relationships (TODO: will) all "punt" on the question when considering a typevar, by translating the desired relationship into a constraint set. At some point, though, we need to resolve a constraint set; at that point, we can no longer punt on the question. Unlike with concrete types, the answer will depend on the constraint set that we are considering. |
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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.