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// Recursive type using boxes enum List { Cons(i32, Box<List>), Nil, } fn main() { // Storing `i32` value on heap let b = Box::new(5); println!("b = {}", b); use crate::List::{Cons, Nil}; let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil)))))); }