mirror of
https://github.com/rust-lang/rust.git
synced 2025-11-04 06:56:14 +00:00
34 lines
542 B
Rust
34 lines
542 B
Rust
// run-pass
|
|
|
|
#![allow(non_camel_case_types)]
|
|
use std::cell::Cell;
|
|
|
|
#[derive(Debug)]
|
|
struct r<'a> {
|
|
i: &'a Cell<isize>,
|
|
}
|
|
|
|
impl<'a> Drop for r<'a> {
|
|
fn drop(&mut self) {
|
|
self.i.set(self.i.get() + 1);
|
|
}
|
|
}
|
|
|
|
fn r(i: &Cell<isize>) -> r {
|
|
r {
|
|
i: i
|
|
}
|
|
}
|
|
|
|
pub fn main() {
|
|
let i = &Cell::new(0);
|
|
// Even though these look like copies, they are guaranteed not to be
|
|
{
|
|
let a = r(i);
|
|
let b = (a, 10);
|
|
let (c, _d) = b;
|
|
println!("{:?}", c);
|
|
}
|
|
assert_eq!(i.get(), 1);
|
|
}
|