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#![feature(adt_const_params)]
//~^ WARN the feature `adt_const_params` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
#[derive(PartialEq, Eq)]
enum Nat {
Z,
S(Box<Nat>),
}
fn foo<const N: Nat>() {}
//~^ ERROR `Box<Nat>` must be annotated with `#[derive(PartialEq, Eq)]` to be used as the type of a const parameter
fn main() {}
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