Function References Can't Be Modified By Default

TKTKTKT

This won't work by default. You have to do the mutalbe version which is on the next page.

SOURCE CODE

fn main() {

  let alfa = String::from("widget");

  attempt_change(&alfa);

}

fn attempt_change(value: &String) {
  value.push_str("update");
}

TODO: Show the error message.