rust/tests/ui/traits/const-traits/const-impl-trait.rs

//@ compile-flags: -Znext-solver
//@ known-bug: #110395

// Broken until we have `const PartialEq` impl in stdlib

#![allow(incomplete_features)]
#![feature(const_trait_impl, const_cmp, const_destruct)]

use std::marker::Destruct;

const fn cmp(a: &impl ~const PartialEq) -> bool {
    a == a
}

const fn wrap(
    x: impl ~const PartialEq + ~const Destruct,
) -> impl ~const PartialEq + ~const Destruct {
    x
}

#[const_trait]
trait Foo {
    fn huh() -> impl ~const PartialEq + ~const Destruct + Copy;
}

impl const Foo for () {
    fn huh() -> impl ~const PartialEq + ~const Destruct + Copy {
        123
    }
}

const _: () = {
    assert!(cmp(&0xDEADBEEFu32));
    assert!(cmp(&()));
    assert!(wrap(123) == wrap(123));
    assert!(wrap(123) != wrap(456));
    let x = <() as Foo>::huh();
    assert!(x == x);
};

#[const_trait]
trait T {}
struct S;
impl const T for S {}

const fn rpit() -> impl ~const T {
    S
}

const fn apit(_: impl ~const T + ~const Destruct) {}

const fn rpit_assoc_bound() -> impl IntoIterator<Item: ~const T> {
    Some(S)
}

const fn apit_assoc_bound(_: impl IntoIterator<Item: ~const T> + ~const Destruct) {}

fn main() {}