struct CallMe {
    int a, b
}

/; method CallMe
    /; call_two (int a, b) [int]
        return a + b + self.a + self.b
    ;/

    /; call_three (int a, b, c) [int]
        return self.call_two(a, b) + self.call_two(a, b) + c
    ;/

    /; call_four (int a, b, c, d) [int]
        return self.call_three(a, b, c) + self.call_three(b, c, d)
    ;/

;/

/; main [int]
    CallMe cm
    cm.a = 0
    cm.b = 0
    return cm.call_four(2, 0, 0, 1)
;/