trpl-zh-cn/listings/ch15-smart-pointers/listing-15-09/src/main.rs

struct MyBox<T>(T);

impl<T> MyBox<T> {
    fn new(x: T) -> MyBox<T> {
        MyBox(x)
    }
}

// ANCHOR: here
fn main() {
    let x = 5;
    let y = MyBox::new(x);

    assert_eq!(5, x);
    assert_eq!(5, *y);
}
// ANCHOR_END: here