error[E0277]: to attach this type to a `Report` it must implement `fmt::Display` and `fmt::Debug`
  --> tests/ui/attach_diagnostics.rs:20:43
   |
20 |     let _ = Report::new(RootError).attach(NotDisplay);
   |                                    ------ ^^^^^^^^^^ unsatisfied trait bound
   |                                    |
   |                                    required by a bound introduced by this call
   |
help: the trait `std::fmt::Display` is not implemented for `NotDisplay`
  --> tests/ui/attach_diagnostics.rs:17:1
   |
17 | struct NotDisplay;
   | ^^^^^^^^^^^^^^^^^
   = note: if you want to attach a type that is not printable, use `attach_opaque` instead
   = note: required for `NotDisplay` to implement `error_stack::Attachment`
note: required by a bound in `error_stack::Report::<C>::attach`
  --> src/report.rs
   |
   |     pub fn attach<A>(mut self, attachment: A) -> Self
   |            ------ required by a bound in this associated function
   |     where
   |         A: Attachment,
   |            ^^^^^^^^^^ required by this bound in `Report::<C>::attach`
