69393b2e6e
This makes an easy tweak to allow our diagnostics for unmatched overloads to apply to method calls. Previously, they only worked for function calls. There is at least one other case worth addressing too, namely, class literals. e.g., `type()`. We had a diagnostic snapshot test case to track it. Closes astral-sh/ty#274
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.