Code shared from the Rust Playground

playground.rs

// use std::cell::RefCell;
// Ownership
use {
    std::ops::Drop
};

#[derive(Debug)]
struct Parent(usize, Child, Child);

#[derive(Debug)]
struct Child(usize);

impl Drop for Parent {
    fn drop(&mut self) {
        println!("Dropping {:?}", self);
    }
}

impl Drop for Child {
    fn drop(&mut self) {
        println!("Dropping {:?}", self);
    }
}



fn main() {
  //let mut rc1 = Rc::new(Child(1));
  let p1 = Parent(1, Child(11), Child(12));
  let p2 = p1;
  println!("a: p2:{:?}", p2);
  println!("a: p1:{:?}", p1);
//   |
//29 |   let p1 = Parent(1, Child(11), Child(12));
//   |       -- move occurs because `p1` has type `Parent`, which does not implement the `Copy` trait
//30 |   let p2 = p1;
//   |            -- value moved here
//31 |   println!("a: p2:{:?}", p2);
//32 |   println!("a: p1:{:?}", p1);
//   |                          ^^ value borrowed here after move
}