module main

@[heap]
struct Node[T] {
mut:
    value T
    next  ?&Node[T]
}

fn print_t1(node ?&Node[int]) {
    println(node)
}

fn print_t2(mut node ?&Node[int]) {
    n := node or { return }
    println(n)
}

fn test_main() {
    mut n := Node[int]{
        value: 5
    }
    print_t1(n)
    print_t2(mut n.next)
}