tests/ui/mir/mir_dynamic_drops_1.rs

   1 // run-fail
   2 // error-pattern:drop 1
   3 // error-pattern:drop 2
   4 // ignore-emscripten no processes
   5
   6 /// Structure which will not allow to be dropped twice.
   7 struct Droppable<'a>(&'a mut bool, u32);
   8 impl<'a> Drop for Droppable<'a> {
   9     fn drop(&mut self) {
  10         if *self.0 {
  11             eprintln!("{} dropped twice", self.1);
  12             ::std::process::exit(1);
  13         }
  14         eprintln!("drop {}", self.1);
  15         *self.0 = true;
  16     }
  17 }
  18
  19 fn mir() {
  20     let (mut xv, mut yv) = (false, false);
  21     let x = Droppable(&mut xv, 1);
  22     let y = Droppable(&mut yv, 2);
  23     let mut z = x;
  24     let k = y;
  25     z = k;
  26 }
  27
  28 fn main() {
  29     mir();
  30     panic!();
  31 }