1 #[derive(Debug)] 2 struct R { 3 b: bool, 4 } 5 6 impl Drop for R { drop(&mut self)7 fn drop(&mut self) {} 8 } 9 main()10 fn main() { 11 let i = Box::new(R { b: true }); 12 let _j = i.clone(); //~ ERROR the method 13 println!("{:?}", i); 14 } 15