--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/other/classkey1.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,17 @@
+// { dg-do compile }
+
+// Copyright (C) 2002 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 28 Feb 2002 <nathan@codesourcery.com>
+
+// PR 775. Some mismatches which were broken.
+
+template <class T> struct A {};
+union A<int> a; // { dg-error "'union' tag" }
+
+template <> union A<float> {}; // { dg-error "'union' tag" }
+
+struct B {};
+union B b;	// { dg-error "'union' tag" }
+
+union C {};
+class C c;	// { dg-error "'class' tag" }