Default arguments

A trailing parameter may declare = expression. A caller can omit it, and every later non-variadic parameter must also have a default. The expression runs at each omitted call in module scope.

Defaults belong to direct declarations. A call through a stored function still requires its exact positional signature.

fn endpoint(host: string, port: int = 8080) -> string {
  "$host:$port"
}

fn main() {
  println(endpoint("local"))
  println(endpoint("local", 9000))
}