summaryrefslogtreecommitdiffstats
path: root/tests/ui/rfc-2632-const-trait-impl/trait-default-body-stability.rs
blob: 334fc4cb8473d179b557b680b047cfe12055a925 (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
// check-pass

#![feature(staged_api)]
#![feature(const_trait_impl)]
#![feature(const_t_try)]
#![feature(const_try)]
#![feature(try_trait_v2)]

#![stable(feature = "foo", since = "1.0")]

use std::ops::{ControlFlow, FromResidual, Try};

#[stable(feature = "foo", since = "1.0")]
pub struct T;

#[stable(feature = "foo", since = "1.0")]
#[rustc_const_unstable(feature = "const_t_try", issue = "none")]
impl const Try for T {
    type Output = T;
    type Residual = T;

    fn from_output(t: T) -> T {
        t
    }

    fn branch(self) -> ControlFlow<T, T> {
        ControlFlow::Continue(self)
    }
}

#[stable(feature = "foo", since = "1.0")]
#[rustc_const_unstable(feature = "const_t_try", issue = "none")]
impl const FromResidual for T {
    fn from_residual(t: T) -> T {
        t
    }
}

#[stable(feature = "foo", since = "1.0")]
#[const_trait]
pub trait Tr {
    #[stable(feature = "foo", since = "1.0")]
    fn bar() -> T {
        T?
        // Should be allowed.
        // Must enable unstable features to call this trait fn in const contexts.
    }
}

fn main() {}