warning: the feature `adt_const_params` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/issue-80471.rs:1:12
   |
LL | #![feature(adt_const_params)]
   |            ^^^^^^^^^^^^^^^^
   |
   = note: see issue #95174 <https://github.com/rust-lang/rust/issues/95174> for more information
   = note: `#[warn(incomplete_features)]` on by default

error[E0741]: `Box<Nat>` must be annotated with `#[derive(PartialEq, Eq)]` to be used as the type of a const parameter
  --> $DIR/issue-80471.rs:10:17
   |
LL | fn foo<const N: Nat>() {}
   |                 ^^^

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0741`.