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diff --git a/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/wchar_t/9318-out.cc b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/wchar_t/9318-out.cc
new file mode 100644
index 00000000000..3685e1fbcae
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/wchar_t/9318-out.cc
@@ -0,0 +1,72 @@
+// Copyright (C) 2005 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+// 27.5.2 template class basic_streambuf
+
+#include <streambuf>
+#include <sstream>
+#include <ostream>
+#include <testsuite_hooks.h>
+
+// libstdc++/9318
+class Outbuf : public std::wstreambuf
+{
+public:
+  typedef std::wstreambuf::traits_type traits_type;
+
+  std::wstring result() const { return str; }
+
+protected:
+  virtual int_type
+  overflow(int_type c = traits_type::eof())
+  {
+    if (!traits_type::eq_int_type(c, traits_type::eof()))
+      str.push_back(traits_type::to_char_type(c));
+    return traits_type::not_eof(c);
+  }
+
+private:
+  std::wstring str;
+};
+
+void test10()
+{
+  bool test __attribute__((unused)) = true;
+
+  std::wstringbuf sbuf(L"Bad Moon Rising", std::wios::in);
+  Outbuf buf;
+  std::wostream stream(&buf);
+  stream << &sbuf;
+
+  VERIFY( buf.result() == L"Bad Moon Rising" );
+}
+
+int main() 
+{
+  test10();
+  return 0;
+}