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
|
//@ check-pass
#![feature(const_trait_impl)]
use std::marker::PhantomData;
struct S<T>(PhantomData<T>);
impl<T> Copy for S<T> {}
impl<T> Clone for S<T> {
fn clone(&self) -> Self {
S(PhantomData)
}
}
impl<T> const std::ops::Add for S<T> {
type Output = Self;
fn add(self, _: Self) -> Self {
S(std::marker::PhantomData)
}
}
const fn twice<T: std::ops::Add>(arg: S<T>) -> S<T> {
arg + arg
}
fn main() {
const _: S<i32> = twice(S(PhantomData));
let _ = twice(S(PhantomData::<i32>));
}
|
