error[E0117]: only traits defined in the current crate can be implemented for arbitrary types --> $DIR/coherence-fundamental-trait-objects.rs:15:1 | LL | impl Misc for dyn Fundamental {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 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`.