| error[E0599]: the function or associated item `partial_cmp` exists for struct `A`, but its trait bounds were not satisfied |
| --> $DIR/derive-sugg-arg-arity.rs:5:23 |
| | |
| LL | pub struct A; |
| | ------------ function or associated item `partial_cmp` not found for this struct because it doesn't satisfy `A: Iterator` or `A: PartialOrd<_>` |
| ... |
| LL | _ => match A::partial_cmp() {}, |
| | ^^^^^^^^^^^ function or associated item cannot be called on `A` due to unsatisfied trait bounds |
| | |
| = note: the following trait bounds were not satisfied: |
| `A: PartialOrd<_>` |
| which is required by `&A: PartialOrd<&_>` |
| `A: PartialOrd<_>` |
| which is required by `&mut A: PartialOrd<&mut _>` |
| `A: Iterator` |
| which is required by `&mut A: Iterator` |
| note: the trait `Iterator` must be implemented |
| --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL |
| help: consider annotating `A` with `#[derive(PartialEq, PartialOrd)]` |
| | |
| LL + #[derive(PartialEq, PartialOrd)] |
| LL | pub struct A; |
| | |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0599`. |