Regression test for #14386

Closes #14386.

src/test/compile-fail/double-type-import.rs

@@ -0,0 +1,24 @@
+// Copyright 2014 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 self::bar::X;
+    use self::bar::X;
+    //~^ ERROR a value named `X` has already been imported in this module
+    //~| ERROR a type named `X` has already been imported in this module
+
+    mod bar {
+        pub struct X;
+    }
+}
+
+fn main() {
+    let _ = foo::X;
+}