fn main() {
    let mut nodes = vec![Node { name: "hey" }, Node { name: "hola" }];
    fun(&mut nodes);
    fun(&mut nodes);
}

struct Node<'a> {
    name: &'a str,
}

fn fun<'a, 'b>(nodes: &'a mut Vec<Node<'b>>) -> &'a Node<'b>{
    &nodes[0]
}