parameter nat;
return (list nat);
storage unit;
code { CAR @counter; NIL @acc nat; SWAP; DUP @cmp_num; PUSH nat 0; CMPNEQ;
       LOOP { DUP; DIP {SWAP}; CONS @acc; SWAP; PUSH nat 1; SWAP; SUB @counter;
              DUP; DIP{ABS}; PUSH int 0; CMPNEQ};
       CONS; UNIT; SWAP; PAIR};
