C++ Clang No viable overloaded '=' 实则是 Chosen constructor is explicit in copy-initialization问题

写 C++ 的时候, 编译器报错, 联想到刚才的解决的初始化必须带 struct 名问题 Stack Overflow-Chosen constructor is explicit in copy-initialization, 试图将代码改成

编译通过, 说明问题其实是隔得比较远声明的变量的 Chosen constructor is explicit in copy-initialization 问题;

特此记录, 以免后世留坑;