1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/union/union-repr-c.rs b/src/test/ui/union/union-repr-c.rs
new file mode 100644
index 00000000000..36c42ce1104
--- /dev/null
+++ b/src/test/ui/union/union-repr-c.rs
@@ -0,0 +1,28 @@
+// 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(unused)]
+#![deny(improper_ctypes)]
+
+#[repr(C)]
+union U {
+    a: u8,
+}
+
+union W {
+    a: u8,
+}
+
+extern "C" {
+    static FOREIGN1: U; // OK
+    static FOREIGN2: W; //~ ERROR union has unspecified layout
+}
+
+fn main() {}