use std::fmt;

struct Meter(u32);

impl fmt::Display for Meter{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f,"{}",self.0)
    }
}

fn add(a:u32,b:u32) -> u32 {
    a + b
}

fn steal(a:&Meter){
    println!("{}",a);
}

fn main() {
    let a = Meter(2);
    steal(&a);
    steal(&a);
}