error[E0117]: only traits defined in the current crate can be implemented for types defined outside of the crate --> $DIR/coherence-cow.rs:26:1 | LL | impl Remote for Pair,U> { } | ^^^^^^^^^^^^^^^^^^^^^---------------- | | | | | `Pair` 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 1 previous error For more information about this error, try `rustc --explain E0117`.