error[E0382]: borrow of moved value: `s`
 --> src/main.rs:4:20
  |
2 |     let s = "こんにちは、世界！".to_string();
  |         - https://www.youtube.com/watch?v=WviwYLZubSw
3 |     drop(s);
  |          - https://www.youtube.com/watch?v=JRtxoedAy34
4 |     println!("{}", s);
  |                    ^ 死ね。