Poseidon library / contract hack

A.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

// HACK: PROTOTYPING ONLY: use "contract" with a fixed address to avoid compiler library settings
contract Poseidon4 {    
    function poseidon(uint256[4] memory) public pure returns (uint256) {}
}
// goerli: after block 8166444
Poseidon4 constant P = Poseidon4(0x3b44AA63Ac599170357dC587880fC30E506612e7);


contract A {
    function add() public pure returns (uint256) {
        return P.poseidon([uint256(1), 2, 3, 4]);
        // 18821383157269793795438455681495246036402687001665670618754263018637548127333
    }
}