a8f7ccf2ca
## Summary Fixes https://github.com/astral-sh/ty/issues/1571. I realised I was overcomplicating things when I described what we should do in that issue description. The simplest thing to do here is just to special-case call expressions and short-circuit the call-binding machinery entirely if we see it's `NotImplemented` being called. It doesn't really matter if the subdiagnostic doesn't fire when a union is called and one element of the union is `NotImplemented` -- the subdiagnostic doesn't need to be exhaustive; it's just to help people in some common cases. ## Test Plan Added snapshots
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.