  │ struct Rectangle {
  │     width: u32,
  │     height: u32,
  │ }
  │ 
_ │ fn main() {
  │     let rect1 = Rectangle { width: 30, height: 50 };
  │ 
  │     println!(
~ │         "The perimeter of the rectangle is {} pixels.",
~ │         perimeter(&rect1)
  │     );
+ │     println!(r#"This line contains invalid utf8:  "�����"#;
  │ }
  │ 
  │ fn area(rectangle: &Rectangle) -> u32 {
  │     rectangle.width * rectangle.height
  │ }
+ │ 
+ │ fn perimeter(rectangle: &Rectangle) -> u32 {
+ │     (rectangle.width + rectangle.height) * 2
+ │ }
──┴─────────────────────────────────────────────────────────────────────────────
