error[E0119]: conflicting implementations of trait `Foo` for type `&_` --> $DIR/coherence-overlap-negate-not-use-feature-gate.rs:5:1 | LL | impl Foo for T {} | --------------------------- first implementation here LL | impl Foo for &U {} | ^^^^^^^^^^^^^^^^^^ conflicting implementation for `&_` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0119`.