error[E0277]: can't compare `Error` with `Error` --> $DIR/derives-span-PartialOrd-enum-struct-variant.rs:9:6 | LL | #[derive(PartialOrd,PartialEq)] | ---------- in this derive macro expansion ... LL | x: Error | ^^^^^^^^ no implementation for `Error < Error` and `Error > Error` | = help: the trait `PartialOrd` is not implemented for `Error` = note: this error originates in the derive macro `PartialOrd` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider annotating `Error` with `#[derive(PartialOrd)]` | LL + #[derive(PartialOrd)] LL | struct Error; | error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.