error[E0782]: trait objects must include the `dyn` keyword --> $DIR/dyn-2021-edition-error.rs:3:17 | LL | fn function(x: &SomeTrait, y: Box) { | ^^^^^^^^^ | help: add `dyn` keyword before this trait | LL | fn function(x: &dyn SomeTrait, y: Box) { | +++ error[E0782]: trait objects must include the `dyn` keyword --> $DIR/dyn-2021-edition-error.rs:3:35 | LL | fn function(x: &SomeTrait, y: Box) { | ^^^^^^^^^ | help: add `dyn` keyword before this trait | LL | fn function(x: &SomeTrait, y: Box) { | +++ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0782`.