// Make me compile only by reordering the lines in `main()`, but without // adding, changing or removing any of them. #[test] fn main() { let mut x = 100; let y = &x; x += 1000; // Note: += is defined by the trait AddAssign: // https://doc.rust-lang.org/std/ops/trait.AddAssign.html println!("{} == {}", y, x); }