mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-03 20:23:59 +00:00
33 lines
493 B
Rust
33 lines
493 B
Rust
// check-pass
|
|
|
|
#![feature(dyn_star)]
|
|
#![allow(incomplete_features)]
|
|
|
|
trait AddOne {
|
|
fn add1(&mut self) -> usize;
|
|
}
|
|
|
|
impl AddOne for usize {
|
|
fn add1(&mut self) -> usize {
|
|
*self += 1;
|
|
*self
|
|
}
|
|
}
|
|
|
|
impl AddOne for &mut usize {
|
|
fn add1(&mut self) -> usize {
|
|
(*self).add1()
|
|
}
|
|
}
|
|
|
|
fn add_one(mut i: dyn* AddOne + '_) -> usize {
|
|
i.add1()
|
|
}
|
|
|
|
fn main() {
|
|
let mut x = 42usize;
|
|
let y = &mut x as (dyn* AddOne + '_);
|
|
|
|
println!("{}", add_one(y));
|
|
}
|