   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 }
