   1   │ struct Rectangle {
   2   │     width: u32,
   3   │     height: u32,
   4   │ }
   5   │ 
   6 _ │ fn main() {
   7   │     let rect1 = Rectangle { width: 30, height: 50 };
   8   │ 
   9   │     println!(
  10 ~ │         "The perimeter of the rectangle is {} pixels.",
  11 ~ │         perimeter(&rect1)
  12   │     );
  13 + │     println!(r#"This line contains invalid utf8:  "�����"#;
  14   │ }
  15   │ 
  16   │ fn area(rectangle: &Rectangle) -> u32 {
  17   │     rectangle.width * rectangle.height
  18   │ }
  19 + │ 
  20 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
  21 + │     (rectangle.width + rectangle.height) * 2
  22 + │ }
───────┴────────────────────────────────────────────────────────────────────────
