error[E0277]: the trait bound `test::TestDescAndFn: example_runner::Testable` is not satisfied --> $DIR/mismatch.rs:19:1 | LL | fn wrong_kind(){} | ^^^^^^^^^^^^^^^^^ the trait `example_runner::Testable` is not implemented for `test::TestDescAndFn` | = note: required for the cast to the object type `dyn example_runner::Testable` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.