| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| #![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); |
| } |