trpl-zh-cn/listings/ch05-using-structs-to-structure-related-data/output-only-02-pretty-debug/src/main.rs

#[derive(Debug)]
struct Rectangle {
    width: u32,
    height: u32,
}

fn main() {
    let rect1 = Rectangle {
        width: 30,
        height: 50,
    };

    println!("rect1 is {:#?}", rect1);
}