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// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.8.4;
/// @notice Simple gas-optimized multi-signature contract.
contract Multisig {
    event Propose(address indexed proposer, uint256 indexed proposal);
    event Sign(address indexed signer, uint256 indexed proposal);
    event Execute(uint256 indexed proposal);

    error NotSigner();

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use std::rc::Rc;

trait HKT<U> {
    type C; // Current type
    type T; // Type with C swapped with U
}

macro_rules! derive_hkt {
    ($t:ident) => {
        impl<T, U> HKT<U> for $t<T> {