--- /dev/null
+// { dg-require-namedlocale "" }
+
+// Copyright (C) 2003, 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <locale>
+#include <testsuite_hooks.h>
+
+class Cvt : public std::codecvt<char, char, std::mbstate_t>
+{
+protected:
+ int do_encoding() const throw()
+ { return -1; }
+
+ bool do_always_noconv() const throw()
+ { return false; }
+};
+
+// libstdc++/13171
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+ using namespace std;
+
+ filebuf fb;
+ fb.pubimbue(locale(locale("en_US"), new Cvt));
+ fb.open("tmp_13171-4", ios_base::out);
+ fb.pubimbue(locale("fr_FR"));
+ fb.sputc('N');
+ fb.pubsync();
+ fb.close();
+}
+
+int main()
+{
+ test01();
+ return 0;
+}