Fizzbuzz Functional in rust

gistfile1.rs

/*
 * Rust Fizzbuzz functional implementation
 */
fn fb (i: int) -> () {
  let mod5 = i % 5 == 0;
  let mod3 = i % 3 == 0;

  match [mod5, mod3] {
      [false, true] => println!("Fizz"),
      [true, false] => println!("Buzz"),
      [false, false] => println!("{}", i),
      [true, true] => println!("FizzBuzz")
  }
}

fn fizzbuzz (up_to: int) -> () {
  fb(up_to);
  if up_to > 0 { fizzbuzz(up_to - 1) }
}

fn main () {
  fizzbuzz(100)
}