| error[E0277]: the trait bound `Box<dyn Map<isize, isize>>: Map<usize, isize>` is not satisfied | |
| --> $DIR/map-types.rs:17:41 | |
| | | |
| LL | let y: Box<dyn Map<usize, isize>> = Box::new(x); | |
| | ^^^^^^^^^^^ the trait `Map<usize, isize>` is not implemented for `Box<dyn Map<isize, isize>>` | |
| | | |
| = note: required for the cast to the object type `dyn Map<usize, isize>` | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0277`. |