1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/union/union-const-eval.rs b/src/test/ui/union/union-const-eval.rs
new file mode 100644
index 00000000000..73b7743fc45
--- /dev/null
+++ b/src/test/ui/union/union-const-eval.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.
+
+union U {
+    a: usize,
+    b: usize,
+}
+
+const C: U = U { a: 10 };
+
+fn main() {
+    unsafe {
+        let a: [u8; C.a]; // OK
+        let b: [u8; C.b]; //~ ERROR constant evaluation error
+                          //~^ NOTE nonexistent struct field
+                          //~| WARNING constant evaluation error
+                          //~| NOTE on by default
+    }
+}