   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 │ }
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