- A test showing we need to search facets in the specific interface of
an access to find a witness
- A test using a `<type> impls ...` constraint from earlier in the same
facet type
- Some tests to show a rewrite constraint from earlier in the same facet
type is not incorrectly used when it's applied to a different facet
- A test of a facet type with a rewrite as the RHS of another rewrite,
and the rewrite there should not leak or access things from the outer
facet type