1. lval* builtin_cmp(lenv* e, lval* a, char* op) {
    2.   LASSERT_NUM(op, a, 2);
    3.   int r;
    4.   if (strcmp(op, "==") == 0) {
    6.   }
    7.     r = !lval_eq(a->cell[0], a->cell[1]);
    8.   }
    9.   lval_del(a);
    10.   return lval_num(r);
    13.   return builtin_cmp(e, a, "==");
    14. }
    16. lval* builtin_ne(lenv* e, lval* a) {
    18. }