summaryrefslogtreecommitdiffstats
path: root/tests/ui/rfc-2632-const-trait-impl/const-impl-trait.rs
blob: 0622f96e70d818ebf7772d472d4a11aa4337d5a3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
// check-pass
#![allow(incomplete_features)]
#![feature(
    associated_type_bounds,
    const_trait_impl,
    const_cmp,
    return_position_impl_trait_in_trait,
)]

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() {}