StupidDiamond.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.28;

abstract contract CommonBase {
    function foo() external pure virtual returns (string memory) {
        return "bar";
    }
}

abstract contract BaseA is CommonBase {}

abstract contract BaseB is CommonBase {
    function foo() external pure override returns (string memory) {
        return "baz";
    }
}

contract Derived is BaseA, BaseB {}