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struct Connection {
    name: String,
}

impl Connection {
    fn new(name: &str) -> Self {
        println!("[{name}] opened");
        Connection { name: name.to_string() }
    }
}

impl Drop for Connection {
    fn drop(&mut self) {
        println!("[{}] closed", self.name);
    }
}

fn main() {
    let _outer = Connection::new("outer");

{
        let _inner = Connection::new("inner");
        println!("inside inner scope");
    } // _inner is dropped here → "[inner] closed"

println!("after inner scope");

let early = Connection::new("early");
    println!("about to drop 'early' explicitly");
    drop(early);   // std::mem::drop — drops before end of scope
    println!("'early' has been dropped");

// _outer is dropped here at the end of main → "[outer] closed"
}

// Expected output:
// [outer] opened
// [inner] opened
// inside inner scope
// [inner] closed
// after inner scope
// [early] opened
// about to drop 'early' explicitly
// [early] closed
// 'early' has been dropped
// [outer] closed