faf54c0181
The diagnostic now includes a pointer to the implementation definition along with each possible overload. This doesn't include information about *why* each overload failed. But given the emphasis on concise output (since there can be *many* unmatched overloads), it's not totally clear how to include that additional information. Fixes #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.