So C or the compiler's for C are kind of dumb, by definition of the language years ago, whereby, they only know about what they've already seen.

所以C或者C的编译器是有点愚蠢的，根据多年前这个语言的定义，凭借那个，他们只知道,他们所看到的。

哈佛公开课 - 计算机科学课程节选