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This PR adds two new `ty_extensions` functions, `reveal_when_assignable_to` and `reveal_when_subtype_of`. These are closely related to the existing `is_assignable_to` and `is_subtype_of`, but instead of returning when the property (always) holds, it produces a diagnostic that describes _when_ the property holds. (This will let us construct mdtests that print out constraints that are not always true or always false — though we don't currently have any instances of those.) I did not replace _every_ occurrence of the `is_property` variants in the mdtest suite, instead focusing on the generics-related tests where it will be important to see the full detail of the constraint sets. As part of this, I also updated the mdtest harness to accept the shorter `# revealed:` assertion format for more than just `reveal_type`, and updated the existing uses of `reveal_protocol_interface` to take advantage of this. |
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| .. | ||
| corpus | ||
| mdtest | ||
| primer | ||
| README.md | ||
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.