Suppress some warnings about features

src/librustc/lib.rs

@@ -44,7 +44,9 @@
 #![feature(path)]
 #![feature(io)]
 #![feature(path_ext)]
+#![feature(str_words)]
 #![cfg_attr(test, feature(test))]
+
 extern crate arena;
 extern crate flate;
 extern crate fmt_macros;

src/librustc_trans/lib.rs

@@ -44,6 +44,7 @@
 #![feature(os)]
 #![feature(path_ext)]
 #![feature(fs)]
+#![feature(hash)]
 
 extern crate arena;
 extern crate flate;

src/librustdoc/lib.rs

@@ -38,6 +38,7 @@
 #![feature(str_words)]
 #![feature(io)]
 #![feature(path)]
+#![feature(file_path)]
 #![feature(path_ext)]
 
 extern crate arena;