struct Outer1 {
    child: Inner1;
}

struct Inner1 {
    n: i32;
}


struct Outer2 {
    child: Inner2;
}

struct Inner2 {
    n: Box<i32>;
}


let x1 = Box::new(Outer1 { n: 1 });
let x2 = Box::new(Outer2 { n: Box::new(1) });