如何求解ParserError：预期的PRAGMA，进口指令或合同/接口/库/struct/enum/constant/constant/function/错误定义。在固体中

Question

我在运行拍卖代码方面非常成功，直到按下一些钥匙，现在出现了此错误，我无法弄清楚为什么此错误显示

ParserError：预期的PRAGMA，IMPOCTIVER或CONTERTIVER/CONTERTIVER/interface/Interface/Library/struct/enum /常数/函数/错误定义。

错误是在第79行中，其中该事件被声明了，

我可能会检查我的pragma声明其pragma solidity＆gt; = 0.7.0＆lt; 0.9.0; 0.9.0;

pragma solidity >=0.7.0 <0.9.0;

contract Auction {
address payable internal auction_owner; 
uint256 public auction_start; 
uint256 public auction_end; 
uint256 public highestBid;
address public highestBidder;

enum auction_state {
CANCELLED, STARTED,ENDED
}
address[] bidders;

mapping(address => uint) public bids; 

auction_state public STATE;



modifier an_ongoing_auction() { require(block.timestamp <= auction_end);
_;
}

modifier only_owner() { require(msg.sender == auction_owner);
_;
}

function MyAuction (uint _biddingTime, address payable  _owner) public {
     auction_owner = _owner; 
     auction_start = block.timestamp;
    auction_end = auction_start + _biddingTime* 1 minutes;
     STATE = auction_state.STARTED;
    if (block.timestamp>auction_end){
        STATE=auction_state.ENDED;
        auction_owner.transfer(highestBid);
        bids[highestBidder]=0;
        
    } 

}

function bid() public payable an_ongoing_auction returns (bool){ 

    require(bids[msg.sender] + msg.value > highestBid, "can't bid, Make a higher Bid" );

    highestBidder = msg.sender; 
    highestBid = msg.value; 
    bidders.push(msg.sender);
    bids[msg.sender] = bids[msg.sender] + msg.value; 
    emit BidEvent(highestBidder, highestBid);
    return true; 
    }
    
}

function withdraw() public payable returns (bool){
   // address payable rec = msg.sender;
    require(block.timestamp > auction_end , "can't withdraw, Auction is still open");
    uint amount= bids[msg.sender];
    bids[msg.sender] = 0; 
    payable(msg.sender).transfer(amount); 
    emit WithdrawalEvent(msg.sender, amount);
    return true;
}
function cancel_auction() only_owner an_ongoing_auction public returns (bool) {
     STATE = auction_state.CANCELLED;
    emit CanceledEvent("Auction Cancelled", block.timestamp,highestBid); 
    return true;
}
function time_remain() an_ongoing_auction public view returns (uint256){
uint256 timeleft= auction_end - block.timestamp;
return timeleft; 

}

event BidEvent(address highestBidder, uint256 highestBid); 

event WithdrawalEvent(address withdrawer, uint256 amount);

event CanceledEvent(string message, uint256 time, uint256 highestBid);
}

Answer 1

代码的快速副本和粘贴到混音中，表明您在投标功能后的关闭式设备放错了。如果您删除了放错位置的闭合支架，则您的代码应正确编译。

Answer 2

您需要清洁和造型代码，以便很容易找到错误。
坚固性需要指定SPDX许可以避免此处的警告是：代码应为：

//SPDX-License-Identifier: Unlicense
pragma solidity >=0.7.0 <0.9.0;

contract Auction {
address payable internal auction_owner; 
uint256 public auction_start; 
uint256 public auction_end; 
uint256 public highestBid;
address public highestBidder;

enum auction_state {
CANCELLED, STARTED,ENDED
}
address[] bidders;

mapping(address => uint) public bids; 

auction_state public STATE;



modifier an_ongoing_auction() { require(block.timestamp <= auction_end);
_;
}

modifier only_owner() { require(msg.sender == auction_owner);
_;
}

function MyAuction (uint _biddingTime, address payable  _owner) public {
     auction_owner = _owner; 
     auction_start = block.timestamp;
    auction_end = auction_start + _biddingTime* 1 minutes;
     STATE = auction_state.STARTED;
    if (block.timestamp>auction_end){
        STATE=auction_state.ENDED;
        auction_owner.transfer(highestBid);
        bids[highestBidder]=0;
        
    } 

}

function bid() public payable an_ongoing_auction returns (bool){ 

    require(bids[msg.sender] + msg.value > highestBid, "can't bid, Make a higher Bid" );

    highestBidder = msg.sender; 
    highestBid = msg.value; 
    bidders.push(msg.sender);
    bids[msg.sender] = bids[msg.sender] + msg.value; 
    emit BidEvent(highestBidder, highestBid);
    return true; 
    }

    
function withdraw() public payable returns (bool){
   // address payable rec = msg.sender;
    require(block.timestamp > auction_end , "can't withdraw, Auction is still open");
    uint amount= bids[msg.sender];
    bids[msg.sender] = 0; 
    payable(msg.sender).transfer(amount); 
    emit WithdrawalEvent(msg.sender, amount);
    return true;
}
function cancel_auction() only_owner an_ongoing_auction public returns (bool) {
     STATE = auction_state.CANCELLED;
    emit CanceledEvent("Auction Cancelled", block.timestamp,highestBid); 
    return true;
}
function time_remain() an_ongoing_auction public view returns (uint256){
uint256 timeleft= auction_end - block.timestamp;
return timeleft; 

}

event BidEvent(address highestBidder, uint256 highestBid); 

event WithdrawalEvent(address withdrawer, uint256 amount);

event CanceledEvent(string message, uint256 time, uint256 highestBid);
    
}