pragma solidity ^0.4.24; import "../token/ERC20/IERC20.sol"; import "../crowdsale/distribution/RefundableCrowdsale.sol"; contract RefundableCrowdsaleImpl is RefundableCrowdsale { constructor ( uint256 openingTime, uint256 closingTime, uint256 rate, address wallet, IERC20 token, uint256 goal ) public Crowdsale(rate, wallet, token) TimedCrowdsale(openingTime, closingTime) RefundableCrowdsale(goal) {} }