Question

truffle编译输出警告：不推荐调用不带“emit”前缀的事件。

Compilation warnings encountered:

zeppelin-solidity/contracts/token/ERC20/BasicToken.sol:38:5: Warning: 
Invoking events without "emit" prefix is deprecated.
   Transfer(msg.sender, _to, _value);

Answer 1

修复是删除zeppelin-solidity并重新安装版本zeppelin-solidity 1.8.0

npm install --save zeppelin-solidity@1.8.0

Answer 2

这与 pragma solidity; 版本有关。从^ 0.4.21开始，如果未使用＆＃34; emit＆＃34;调用事件，编译器将发出警告。关键字明确。

Answer 3

我试图更新....但无济于事：

~/D/S/z/h/MyToken ❯❯❯ npm install --save zeppelin-solidity@1.8.0


+ zeppelin-solidity@1.8.0
updated 1 package in 2.197s
[tom@13inch.local:~/Dropbox/Sites/zld.awaken.guru/hackernoon/MyToken]
~/D/S/z/h/MyToken ❯❯❯ truffle develop

Truffle Develop started at http://127.0.0.1:9545/
...
truffle(develop)> test
Compiling ./contracts/Migrations.sol...
Compiling ./contracts/NuZilan.sol...
Compiling zeppelin-solidity/contracts/math/SafeMath.sol...

Compilation warnings encountered:

/Users/tom/Dropbox/Sites/zld.awaken.guru/hackernoon/MyToken/contracts/NuZilan.sol:64:9: Warning: Invoking events without "emit" prefix is deprecated.
        Transfer(address(0), msg.sender, totalSupply);
        ^-------------------------------------------^

这是一个刚刚初始化的项目（今天），包看起来像：

{
  "name": "MyToken",
  "version": "1.0.0",
  "description": "",
  "main": "truffle-config.js",
  "directories": {
    "test": "test"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "ethereumjs-tx": "^1.3.4",
    "zeppelin-solidity": "^1.8.0"
  }
}

truffle compile警告：不推荐调用没有“emit”前缀的事件

3 个答案: