tests/ui/resource-assign-is-not-copy.rs

   1 // run-pass
   2
   3 #![allow(non_camel_case_types)]
   4 use std::cell::Cell;
   5
   6 #[derive(Debug)]
   7 struct r<'a> {
   8     i: &'a Cell<isize>,
   9 }
  10
  11 impl<'a> Drop for r<'a> {
  12     fn drop(&mut self) {
  13         self.i.set(self.i.get() + 1);
  14     }
  15 }
  16
  17 fn r(i: &Cell<isize>) -> r {
  18     r {
  19         i: i
  20     }
  21 }
  22
  23 pub fn main() {
  24     let i = &Cell::new(0);
  25     // Even though these look like copies, they are guaranteed not to be
  26     {
  27         let a = r(i);
  28         let b = (a, 10);
  29         let (c, _d) = b;
  30         println!("{:?}", c);
  31     }
  32     assert_eq!(i.get(), 1);
  33 }