servo: Merge #5434 - Move to new io in util (from Ms2ger:util-old-io); r=jdm

Source-Repo: https://github.com/servo/servo
Source-Revision: be255304af65ac6aa4d26ea214460073536b9b09

servo/components/util/debug_utils.rs

@@ -2,8 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use std::old_io as io;
-use std::old_io::Writer;
+use std::io::{self, Write};
 use std::mem;
 use std::mem::size_of;
 use std::slice;

servo/components/util/lib.rs

@@ -10,7 +10,6 @@
 #![feature(hash)]
 #![feature(int_uint)]
 #![feature(io)]
-#![feature(old_io)]
 #![feature(optin_builtin_traits)]
 #![feature(path)]
 #![cfg_attr(not(target_os = "android"), feature(path_ext))]

servo/components/util/opts.rs

@@ -14,7 +14,7 @@ use getopts;
 use std::collections::HashSet;
 use std::cmp;
 use std::env;
-use std::old_io as io;
+use std::io::{self, Write};
 use std::mem;
 use std::ptr;
 use std::rt;
@@ -156,7 +156,9 @@ pub fn print_debug_usage(app: &str)  {
 }
 
 fn args_fail(msg: &str) {
-    io::stderr().write_line(msg).unwrap();
+    let mut stderr = io::stderr();
+    stderr.write_all(msg.as_bytes()).unwrap();
+    stderr.write_all(b"\n").unwrap();
     env::set_exit_status(1);
 }