error[E0308]: mismatched types --> $DIR/variance-invariant-arg-object.rs:11:5 | LL | v | ^ lifetime mismatch | = note: expected trait object `dyn Get<&'min i32>` found trait object `dyn Get<&'max i32>` note: the lifetime `'min` as defined on the function body at 7:21... --> $DIR/variance-invariant-arg-object.rs:7:21 | LL | fn get_min_from_max<'min, 'max>(v: Box>) | ^^^^ note: ...does not necessarily outlive the lifetime `'max` as defined on the function body at 7:27 --> $DIR/variance-invariant-arg-object.rs:7:27 | LL | fn get_min_from_max<'min, 'max>(v: Box>) | ^^^^ error[E0308]: mismatched types --> $DIR/variance-invariant-arg-object.rs:18:5 | LL | v | ^ lifetime mismatch | = note: expected trait object `dyn Get<&'max i32>` found trait object `dyn Get<&'min i32>` note: the lifetime `'min` as defined on the function body at 14:21... --> $DIR/variance-invariant-arg-object.rs:14:21 | LL | fn get_max_from_min<'min, 'max, G>(v: Box>) | ^^^^ note: ...does not necessarily outlive the lifetime `'max` as defined on the function body at 14:27 --> $DIR/variance-invariant-arg-object.rs:14:27 | LL | fn get_max_from_min<'min, 'max, G>(v: Box>) | ^^^^ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`.