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error[E0277]: the trait bound `Box<dyn Map<isize, isize>>: Map<usize, isize>` is not satisfied
--> $DIR/map-types.rs:17:41
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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>>`
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= help: the trait `Map<K, V>` is implemented for `HashMap<K, V>`
= note: required for the cast from `Box<Box<dyn Map<isize, isize>>>` to `Box<dyn Map<usize, isize>>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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