[PATCH] PR libstdc++/89851 Add testcase for std::variant equality

[Jonathan Wakely]

Add a test for the regression introduced with r269422 and fixed with
r270056.

	PR libstdc++/89851
	* testsuite/20_util/variant/89851.cc: New test.

Tested x86_64-linux, committed to trunk.

-------------- next part --------------
commit 429d850417840c18a5a1e90ee085f474395a7117
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Apr 9 20:46:47 2019 +0100

    PR libstdc++/89851 Add testcase for std::variant equality
    
    Add a test for the regression introduced with r269422 and fixed with
    r270056.
    
            PR libstdc++/89851
            * testsuite/20_util/variant/89851.cc: New test.

diff --git a/libstdc++-v3/testsuite/20_util/variant/89851.cc b/libstdc++-v3/testsuite/20_util/variant/89851.cc
new file mode 100644
index 00000000000..f4993556ab2
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/variant/89851.cc
@@ -0,0 +1,40 @@
+// Copyright (C) 2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++17" }
+// { dg-do run { target c++17 } }
+
+#include <variant>
+#include <testsuite_hooks.h>
+
+// PR libstdc++/89851
+
+void
+test01()
+{
+  using V = std::variant<int, int>;
+  V v1{std::in_place_index<0>, 0};
+  V v2{std::in_place_index<1>, 0};
+  VERIFY(   v1 != v2  );
+  VERIFY( !(v1 == v2) );
+}
+
+int
+main()
+{
+  test01();
+}