50种编程语言，一句 “Hello, World”！展现编程语言七十年发展！

mod confinment {

    use std::os::raw::{c_char};

    extern "C" {

        pub fn puts(txt: *const c_char);

    }

}

pub fn main() {

    unsafe {

        confinment::puts(

            std::ffi::CString::new("Hello, world!").expect("failed!").as_ptr()

        );

    }

}