pub fun main() ! Io -> Unit {
    // Args not ordered by name, in different order from params.
    printMessage!(.b = ", ", .a = "hello", .c = "world\n");
}

// Params not ordered by name, in different order from args.
fun printMessage(.a: String, .c: String, .b: String) ! Io -> Unit {
    print!(a);
    print!(b);
    print!(c);
}