Add test

src/test/compile-fail/glob-cycles.rs

@@ -0,0 +1,26 @@
+// 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.
+
+mod foo {
+    pub use bar::*;
+    pub use main as f; //~ ERROR has already been imported
+}
+
+mod bar {
+    pub use foo::*;
+}
+
+pub use foo::*;
+pub use baz::*; //~ ERROR has already been imported
+mod baz {
+    pub use super::*;
+}
+
+pub fn main() {}