blob: acf0a967a884dc663be630047ac2c29b54dcc014 (
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
|
// Tests that specializing trait impls must be at least as const as the default impl.
//@ revisions: spec min_spec
#![feature(const_trait_impl)]
#![cfg_attr(spec, feature(specialization))]
//[spec]~^ WARN the feature `specialization` is incomplete
#![cfg_attr(min_spec, feature(min_specialization))]
#[const_trait]
trait Value {
fn value() -> u32;
}
impl<T> const Value for T {
default fn value() -> u32 {
0
}
}
struct FortyTwo;
impl Value for FortyTwo {
//~^ ERROR conflicting implementations
fn value() -> u32 {
println!("You can't do that (constly)");
42
}
}
fn main() {}
|
