src/test/ui/self/self-re-assign.rs

// run-pass
// Ensure assigning an owned or managed variable to itself works. In particular,
// that we do not glue_drop before we glue_take (#3290).

#![feature(box_syntax)]

use std::rc::Rc;

pub fn main() {
   let mut x: Box<_> = box 3;
   x = x;
   assert_eq!(*x, 3);

   let mut x = Rc::new(3);
   x = x;
   assert_eq!(*x, 3);
}