src/test/ui/assign-assign.rs

   1 // run-pass
   2 // Issue 483 - Assignment expressions result in nil
   3
   4 fn test_assign() {
   5     let mut x: isize;
   6     let y: () = x = 10;
   7     assert_eq!(x, 10);
   8     assert_eq!(y, ());
   9     let mut z = x = 11;
  10     assert_eq!(x, 11);
  11     assert_eq!(z, ());
  12     z = x = 12;
  13     assert_eq!(x, 12);
  14     assert_eq!(z, ());
  15 }
  16
  17 fn test_assign_op() {
  18     let mut x: isize = 0;
  19     let y: () = x += 10;
  20     assert_eq!(x, 10);
  21     assert_eq!(y, ());
  22     let mut z = x += 11;
  23     assert_eq!(x, 21);
  24     assert_eq!(z, ());
  25     z = x += 12;
  26     assert_eq!(x, 33);
  27     assert_eq!(z, ());
  28 }
  29
  30 pub fn main() { test_assign(); test_assign_op(); }