--- /dev/null
+// 2005-09-10 Paolo Carlini <pcarlini@suse.de>
+//
+// Copyright (C) 2005, 2009 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-do compile }
+
+// libstdc++/23781
+#include <map>
+
+std::multimap<int, int>::iterator it = NULL; // { dg-error "conversion" }
+std::multimap<int, int>::const_iterator cit = NULL; // { dg-error "conversion" }