RosettaCodeData/Task/Ackermann-function/Rust/ackermann-function-2.rs

fn ack(m: u64, n: u64) -> u64 {
	match (m, n) {
		(0, n) => n + 1,
		(m, 0) => ack(m - 1, 1),
		(m, n) => ack(m - 1, ack(m, n - 1)),
	}
}