Stupid question on `Box<Foo>` vs. `Box<dyn Foo>`: does this syntax apply to any other places where a trait is used as a type parameter? E.g. //do we writ

Stupid question on `Box<Foo>` vs. `Box<dyn Foo>`: does this syntax apply to any other places where a trait is used as a type parameter? E.g. //do we write the type of MyBox like 'MyBox<dyn Debug>'? struct MyBox<T : ?Sized>{ inner: Box<T> }