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This finally completes the deletion of all old diagnostic types. We do this by migrating the second (and last) use of secondary diagnostic messages: to highlight the return type of a function definition when its return value is inconsistent with the type. Like the last diagnostic, we do actually change the message here a bit. We don't need a sub-diagnostic here, and we can instead just add a secondary annotation to highlight the return type.
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/red_knot_test/README.md for documentation of this test format.