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diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/rfind/wchar_t/3.cc b/libstdc++-v3/testsuite/21_strings/basic_string/rfind/wchar_t/3.cc
new file mode 100644
index 00000000..30dcba62
--- /dev/null
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/rfind/wchar_t/3.cc
@@ -0,0 +1,64 @@
+// from tstring.cc, from jason merrill, et. al.
+
+// Copyright (C) 2000, 2003, 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/>.
+
+#include <string>
+#include <testsuite_hooks.h>
+
+// 21.3.6.6 basic_string::find_last_not_of
+bool test03()
+{
+  bool test __attribute__((unused)) = true;
+  typedef std::wstring::size_type csize_type;
+  std::wstring::size_type pos;
+  csize_type npos = std::wstring::npos;
+
+  std::wstring x;
+  pos = x.find_last_not_of(L'X');
+  VERIFY( pos == npos );
+  pos = x.find_last_not_of(L"XYZ");
+  VERIFY( pos == npos );
+
+  std::wstring y(L"a");
+  pos = y.find_last_not_of(L'X');
+  VERIFY( pos == 0 );
+  pos = y.find_last_not_of(L'a');
+  VERIFY( pos == npos );
+  pos = y.find_last_not_of(L"XYZ");
+  VERIFY( pos == 0 );
+  pos = y.find_last_not_of(L"a");
+  VERIFY( pos == npos );
+
+  std::wstring z(L"ab");
+  pos = z.find_last_not_of(L'X');
+  VERIFY( pos == 1 );
+  pos = z.find_last_not_of(L"XYZ");
+  VERIFY( pos == 1 );
+  pos = z.find_last_not_of(L'b');
+  VERIFY( pos == 0 );
+  pos = z.find_last_not_of(L"Xb");
+  VERIFY( pos == 0 );
+  pos = z.find_last_not_of(L"Xa");
+  VERIFY( pos == 1 );
+  return test;
+}
+int main()
+{
+  test03();
+  return 0;
+}