If the answer to question 2 is no, then you should look for the assignablecause 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。
2
If the answer to question 4 is no, then you should again be looking for the assignablecause 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。
3
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.