solidity Error:linearization of inherintance graph impossable

在下面的代码中,Solidity会报错:“Linearization of inheritance graph impossible”。code // 如下代码没法编译 pragma solidity >=0.4.0 <0.7.0; contract X {} contract A is X {} contract C is A, X {} 缘由是C要求X来重写A(定义A,X这个顺序),但A自
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