error[E0277]: can't compare `Comparable` with `Comparable`
  --> $DIR/issue-34229.rs:2:46
   |
LL | #[derive(PartialEq, PartialOrd)] struct Nope(Comparable);
   |                                              ^^^^^^^^^^ no implementation for `Comparable < Comparable` and `Comparable > Comparable`
   |
   = help: the trait `PartialOrd` is not implemented for `Comparable`
   = note: required by `std::cmp::PartialOrd::partial_cmp`
   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.