error[E0308]: mismatched types --> $DIR/E0308-2.rs:9:13 | LL | impl Eq for &dyn DynEq {} | ^^^^^^^^^^ lifetime mismatch | = note: expected trait `<&dyn DynEq as PartialEq>` found trait `<&(dyn DynEq + 'static) as PartialEq>` note: the anonymous lifetime as defined here... --> $DIR/E0308-2.rs:9:13 | LL | impl Eq for &dyn DynEq {} | ^ = note: ...does not necessarily outlive the static lifetime error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.