Playing around with Rust ownership

references.fs

fn main() {
    let x = String::from("hello"); // allocate from the heap
    let mut y = x;
//    let mut y = x.clone(); // clone if you want to use x again
    y.push_str(", world! ");

    append(&mut y);
    print(&y);
    append(&mut y);
    print(&y);
//    print(&x); // breaks because no Copy trait
}

fn print(s: &String) {
    println!("{}", s);
}

fn append(s: &mut String) {
    s.push_str("--append");
}