pub struct Data {
    id: u32,
}

impl Drop for Data {
    fn drop(&mut self) {
        println!("drop {}", self.id);
    }
}

fn main() {
    let vec = vec![Data{id: 1}, Data{id: 2}];
    for (i, _) in vec.into_iter().enumerate() {
        println!("do {}", i);
    }
    println!("THE END");
}