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                                            liyang-eric

第20章的一个测试题有问题

![image](https://user-images.githubusercontent.com/42539774/203720266-d836392e-2412-401d-85b5-f9f04e277c73.png) 正确的方式应该是这样？ ``` constructor(uint256 _amount) payable { payable(address(this)).transfer(_amount); } ```