ModifierOverriding.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.6.0 <0.9.0;

contract Base1 {
    modifier foo() virtual {
        _;
    }
}

contract Base2 {
    modifier foo() virtual {
        _;
    }
}

contract Inherited is Base1, Base2 {
    modifier foo() override(Base1, Base2) {
        _;
    }
}