File: issue-73899.rs

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rustc 1.89.0%2Bdfsg1-1
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//@ run-pass
#![feature(generic_const_exprs)]
#![allow(incomplete_features)]

trait Foo {}

impl<const N: usize> Foo for [(); N] where Self: FooImpl<{ N == 0 }> {}

trait FooImpl<const IS_ZERO: bool> {}

impl FooImpl<{ 0u8 == 0u8 }> for [(); 0] {}

impl<const N: usize> FooImpl<{ 0u8 != 0u8 }> for [(); N] {}

fn foo<T: Foo>(_v: T) {}

fn main() {
    foo([]);
    foo([()]);
}