If the answer to question 2 is no, then you should look for the assignable cause instead of tinkering with the limits.
如果答案是否定的，那么第二个问题，你应该找指定的原因而不是限制的。
If the answer to question 4 is no, then you should again be looking for the assignable cause instead of tinkering with the limits.
如果答案是否定的，那么问题4你应该再找转让原因而不是在极限。
It therefore must conclude that the argument is of type Box, which will cause a compilation error after method resolution because Box is not assignable to Box.
因此必将得出参数的类型是Box，其将导致在方法解析以后出现编译错误，因为Box不会分配给Box。
It therefore must conclude that the argument is of type Box, which will cause a compilation error after method resolution because Box is not assignable to Box.
因此必将得出参数的类型是Box，其将导致在方法解析以后出现编译错误，因为Box不会分配给Box。
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