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contracts...4_TestCustomError .sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

error ErrorWithNoParams();
error ErrorWithParams(int x, string errorMessage);

contract TestCustomError {
    address payable owner = payable(msg.sender);

    function CustomErrorWithParamsView(int _x) external pure {
        revert ErrorWithParams(_x, "this is an error");
    }
}