struct a b c d end;

method m(ar)
       20 - ar.inc() - 70;
       var y := this.b - ar.inc() - (this.inc() * -10) - this.b - ar.b;
       return ar.inc() - inc() - (y * -1);
end;

method inc()
       this.a := this.a - -1;
       this.b := this.b - -1;
       this.c := this.c - -1;
       this.d := this.d - -1;
       return this.a;
end;