error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
  --> $DIR/coherence_local_err_struct.rs:17:1
   |
LL | impl lib::MyCopy for lib::MyStruct<MyType> { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl doesn't use types inside crate
   |
   = note: the impl does not reference only types defined in this 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`.