9ab276b345
## Summary Add a subtly different test case for recursive PEP 695 type aliases, which does require that we relax our union simplification, so we don't eagerly unpack aliases from user-provided union annotations. ## Test Plan Added mdtest.
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.