error[E0277]: the trait bound `Error: Clone` is not satisfied --> $DIR/derives-span-Clone-enum.rs:9:6 | LL | #[derive(Clone)] | ----- in this derive macro expansion ... LL | Error | ^^^^^ the trait `Clone` is not implemented for `Error` | = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider annotating `Error` with `#[derive(Clone)]` | LL + #[derive(Clone)] LL | struct Error; | error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.