From 4080efd274f99ed0f6ee610086c5dce5a6168954 Mon Sep 17 00:00:00 2001
From: Jeffrey Seyfried <jeffrey.seyfried@gmail.com>
Date: Fri, 7 Oct 2016 09:23:41 +0000
Subject: [PATCH] Add regression test.

---
 src/test/run-pass/issue-37020.rs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 src/test/run-pass/issue-37020.rs

diff --git a/src/test/run-pass/issue-37020.rs b/src/test/run-pass/issue-37020.rs
new file mode 100644
index 00000000000..7d0d20269ab
--- /dev/null
+++ b/src/test/run-pass/issue-37020.rs
@@ -0,0 +1,25 @@
+// 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.
+
+#![allow(private_in_public)]
+
+mod foo {
+    pub mod bar {
+        extern crate core;
+    }
+}
+
+mod baz {
+    pub use foo::bar::core;
+}
+
+fn main() {
+    baz::core::cell::Cell::new(0u32);
+}