#[derive(Debug)]
enum List {
    Node(i32,Box<List>),
    Child(Vec<Box<List>>),
    Nil,
}
use List::{Child,Node, Nil};

fn main() {

    let child = Box::new(Child(vec![Box::new(Node(5,Box(Nil)))]));
    let aa = Node(3,child);
    println!("{:?}",aa);
}