error[E0404]: expected trait, found derive macro `Debug` --> $DIR/use-placement-resolve.rs:11:14 | LL | fn foobar(x: T) {} | ^^^^^ not a trait | help: consider importing this trait instead | LL + use std::fmt::Debug; | error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0404`.