Add test

src/test/compile-fail/trait-privacy.rs

@@ -0,0 +1,30 @@
+// Copyright 2016 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.
+
+#![feature(rustc_attrs)]
+#![allow(dead_code)]
+
+mod foo {
+    pub use self::bar::T;
+    mod bar {
+        pub trait T {
+            fn f(&self) {}
+        }
+        impl T for () {}
+    }
+}
+
+fn g() {
+    use foo::T;
+    ().f(); // Check that this does not trigger a privacy error
+}
+
+#[rustc_error]
+fn main() {} //~ ERROR compilation successful