#![allow(unused)]
struct PrintOnDrop(&'static str);

impl Drop for PrintOnDrop {
    fn drop(&mut self) {
        println!("{}", self.0);
    }
}

fn main() {
    macro_rules! guard {
        ($label: expr) => {
            let _guard = PrintOnDrop($label);
        }
    }

    guard!("Declared first!");
    let _guard = PrintOnDrop("Declared second!");
    guard!("Declared third!");
    let _guard = PrintOnDrop("Declared fourth!");
}