function notifyCollateralNotReturned(uint dealID) public {
    REPODeal storage deal = deals[dealID];
    require(deal.state == 2);
    require(block.number >= deal.endsAt);

    sendGoods(deal.pledge, deal.lender, deal.pledgeAmount);

    deal.state = -3;
    CollateralNotReturned(dealID);
  }