src/test/ui/drop/drop-struct-as-object.rs

   1 // run-pass
   2 #![allow(unused_variables)]
   3 #![allow(non_upper_case_globals)]
   4
   5 // Test that destructor on a struct runs successfully after the struct
   6 // is boxed and converted to an object.
   7
   8 static mut value: usize = 0;
   9
  10 struct Cat {
  11     name : usize,
  12 }
  13
  14 trait Dummy {
  15     fn get(&self) -> usize;
  16 }
  17
  18 impl Dummy for Cat {
  19     fn get(&self) -> usize { self.name }
  20 }
  21
  22 impl Drop for Cat {
  23     fn drop(&mut self) {
  24         unsafe { value = self.name; }
  25     }
  26 }
  27
  28 pub fn main() {
  29     {
  30         let x = Box::new(Cat {name: 22});
  31         let nyan: Box<dyn Dummy> = x as Box<dyn Dummy>;
  32     }
  33     unsafe {
  34         assert_eq!(value, 22);
  35     }
  36 }