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`.