mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 06:51:58 +00:00
28 lines
508 B
Rust
28 lines
508 B
Rust
// run-pass
|
|
// check-run-results
|
|
|
|
#![feature(dyn_star)]
|
|
//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
|
|
|
|
trait AddOne {
|
|
fn add1(&mut self) -> usize;
|
|
}
|
|
|
|
impl AddOne for usize {
|
|
fn add1(&mut self) -> usize {
|
|
*self += 1;
|
|
*self
|
|
}
|
|
}
|
|
|
|
fn add_one(i: &mut (dyn* AddOne + '_)) -> usize {
|
|
i.add1()
|
|
}
|
|
|
|
fn main() {
|
|
let mut x = 42usize as dyn* AddOne;
|
|
|
|
println!("{}", add_one(&mut x));
|
|
println!("{}", add_one(&mut x));
|
|
}
|