error[E0277]: the trait bound `X: Ord` is not satisfied --> $DIR/issue-20162.rs:5:7 | LL | b.sort(); | ^^^^ the trait `Ord` is not implemented for `X` | note: required by a bound in `slice::::sort` --> $SRC_DIR/alloc/src/slice.rs:LL:COL help: consider annotating `X` with `#[derive(Ord)]` | LL | #[derive(Ord)] | error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.