Language extension requires the use of an extended compiler and related tools.
语言扩展要求使用已扩展的编译器和相关工具。
2
A compiler could, of course, choose to accept other expressions as an extension.
当然，编译器可以选择接受其他表达式作为一个扩展。
3
You can down-vote it all you want, but the fact remains: a non-standard extension is not going to work when you move to a compiler that does not support it.