Return early

A tail expression handles the ordinary path. return value leaves the function immediately, which is useful for a small guard. A void function may use bare return.

Every path in a value-returning function must produce the declared type. moon checks that before any path runs.

fn admission(age: int) -> string {
  if age < 18 { return "minor" }
  "free"
}

fn main() {
  println(admission(20))
  println(admission(12))
}