From a compiler writer point of view it is easy to convert from one to the other.
从编译器编写者的角度来说，做这种双向的转化都是比较容易的。
If the programmer can simulate aconstruct faster than a compiler can implement the construct itself, then the compiler writer has blown it badly. (Guy Steele)
如果程序员模拟一个结构比编译器实现这个结构还快，那这个编译器写的可够烂的。
If the programmer can simulate aconstruct faster than a compiler can implement the construct itself, then the compiler writer has blown it badly. (Guy Steele)
如果程序员模拟一个结构比编译器实现这个结构还快，那这个编译器写的可够烂的。
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