Solidity 0.6.11 更新

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.11;
interface Gathering {
  /// The address `participant` just registered for the gathering.
  event Registered(address participant);

  /// Registers `msg.sender` to take part in the gathering.
  function register() external;
}

contract MyGathering is Gathering {
  mapping(address => bool) public participants;

  function register() public override {
    participants[msg.sender] = true;
    emit Registered(msg.sender);
  }
}

{
    "events": {
        "Registered(address)": {
            "notice": "The address `participant` just registered for the gathering."
        }
    },
    "kind": "user",
    "methods": {
        "register()": {
            "notice": "Registers `msg.sender` to take part in the gathering."
        }
    },
    "version": 1
}

reqire(msg.value >= 10 gwei);