mrb_yield_with_class(mrb_state *mrb, mrb_value b, mrb_int argc, const mrb_value *argv, mrb_value self, struct RClass *c)
{
  struct RProc *p;
  mrb_sym mid = mrb->c->ci->mid;
  mrb_callinfo *ci;
  int n = mrb->c->ci->nregs;
  mrb_value val;

  if (mrb_nil_p(b)) {
    mrb_raise(mrb, E_ARGUMENT_ERROR, "no block given");
  }
  if (mrb->c->ci - mrb->c->cibase > MRB_FUNCALL_DEPTH_MAX) {
    mrb_exc_raise(mrb, mrb_obj_value(mrb->stack_err));
  }
  p = mrb_proc_ptr(b);
  ci = cipush(mrb);
  ci->mid = mid;
  ci->proc = p;
  ci->stackent = mrb->c->stack;
  ci->argc = (int)argc;
  ci->target_class = c;
  ci->acc = CI_ACC_SKIP;
  mrb->c->stack = mrb->c->stack + n;
  ci->nregs = MRB_PROC_CFUNC_P(p) ? (int)(argc+2) : p->body.irep->nregs;
  stack_extend(mrb, ci->nregs);

  mrb->c->stack[0] = self;
  if (argc > 0) {
    stack_copy(mrb->c->stack+1, argv, argc);
  }
  mrb->c->stack[argc+1] = mrb_nil_value();

  if (MRB_PROC_CFUNC_P(p)) {
    val = MRB_PROC_CFUNC(p)(mrb, self);
    mrb->c->stack = mrb->c->ci->stackent;
    cipop(mrb);
  }
  else {
    val = mrb_run(mrb, p, self);
  }
  return val;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.