auto merge of #6007 : pcwalton/rust/use-mod, r=brson

r? @brson

src/test/run-pass/use-mod.rs

@@ -1,24 +0,0 @@
-// xfail-fast
-
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use mod a::b;
-
-mod a {
-    pub mod b {
-        pub fn f() {}
-    }
-}
-
-pub fn main() {
-    b::f();
-}
-