Mutable And Immutable References Can't Be Combined

TODO: Make this a page:

You can have an immutable reference to a mutable variable.

SOURCE CODE

fn main() {

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

  let bravo = &alfa;

  println!("bravo {}", bravo)

}

CODE RUNNER

Testing examples:

Mutable references to immutable variables throw an error. Show this error.

fn main() {

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

  let bravo = &mut alfa;

  println!("bravo {}", bravo);

}