1  // SPDX-License-Identifier: MIT
 2  pragma solidity >=0.4.22 <0.8.0;
 3  
 4  contract Migrations {
 5    address public owner = msg.sender;
 6    uint public last_completed_migration;
 7  
 8    modifier restricted() {
 9          require(
10            msg.sender == owner,
11            "This function is restricted to the contract's owner"
12          );
13          _;
14    }
15  
16    function setCompleted(uint completed) public restricted {
17          last_completed_migration = completed;
18    }
19  }