rust/src/test/ui/coherence/coherence-cow.re_a.stderr

error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
  --> $DIR/coherence-cow.rs:18:1
   |
LL | impl<T> Remote for Pair<T,Cover<T>> { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl doesn't use types inside crate
   |
   = note: `lib::Pair<T, Cover<T>>` is not defined in the current create
   = 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`.