error[E0404]: expected trait, found derive macro `Debug` --> $DIR/universal_wrong_bounds.rs:9:24 | LL | fn wants_debug(g: impl Debug) { } | ^^^^^ not a trait | help: consider importing this trait instead | LL | use std::fmt::Debug; | error[E0404]: expected trait, found derive macro `Debug` --> $DIR/universal_wrong_bounds.rs:10:26 | LL | fn wants_display(g: impl Debug) { } | ^^^^^ not a trait | help: consider importing this trait instead | LL | use std::fmt::Debug; | error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0404`.