error[E0117]: only traits defined in the current crate can be implemented for arbitrary types --> $DIR/coherence-fundamental-trait-objects.rs:12:1 | LL | impl Misc for dyn Fundamental {} | ^^^^^^^^^^^^^^---------------------- | | | | | `dyn Fundamental` is not defined in the current crate | impl doesn't use only types from inside the current crate | = note: define and implement a trait or new type instead error: aborting due to previous error For more information about this error, try `rustc --explain E0117`.