tests/ui/stdlib-unit-tests/builtin-clone.rs

   1 // run-pass
   2 // Test that `Clone` is correctly implemented for builtin types.
   3 // Also test that cloning an array or a tuple is done right, i.e.
   4 // each component is cloned.
   5
   6 fn test_clone<T: Clone>(arg: T) {
   7     let _ = arg.clone();
   8 }
   9
  10 fn foo() { }
  11
  12 #[derive(Debug, PartialEq, Eq)]
  13 struct S(i32);
  14
  15 impl Clone for S {
  16     fn clone(&self) -> Self {
  17         S(self.0 + 1)
  18     }
  19 }
  20
  21 fn main() {
  22     test_clone(foo);
  23     test_clone([1; 56]);
  24     test_clone((1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1));
  25
  26     let a = [S(0), S(1), S(2)];
  27     let b = [S(1), S(2), S(3)];
  28     assert_eq!(b, a.clone());
  29
  30     let a = (
  31         (S(1), S(0)),
  32         (
  33             (S(0), S(0), S(1)),
  34             S(0)
  35         )
  36     );
  37     let b = (
  38         (S(2), S(1)),
  39         (
  40             (S(1), S(1), S(2)),
  41             S(1)
  42         )
  43     );
  44     assert_eq!(b, a.clone());
  45 }