我用Rust 1.0 alpha编写了一个非常简单的cat函数.
use std::io;
fn main(){
let mut reader = io::stdin();
loop {
let input = reader.read_line().ok().expect("Failed to read line");
print!("{}", input);
}
}
当我编译它时，我得到以下警告:
bindings.rs:5:26: 5:35 warning: use of unstable item, #[warn(unstable)] on by default
bindings.rs:5 let mut reader = io::stdin();
^~~~~~~~~
bindings.rs:6:28: 6:39 warning: use of unstable item, #[warn(unstable)] on by default
bindings.rs:6 let input = reader.read_line().ok().expect("Failed to read line");
^~~~~~~~~~~
有没有办法纠正这些警告？