contract BurnableCrowdsale is FinalizableCrowdsale {
  /**
   * @dev Burns any tokens held by this address.
   */
  function finalization() internal {
    token.burn(token.balanceOf(address(this)));
    super.finalization();
  }
}
function finalization() internal {
  token.burn(token.balanceOf(address(this)));
  super.finalization();
}

/**
 * @dev Burns any tokens held by this address.
 */