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diff --git a/libstdc++-v3/testsuite/22_locale/time_put/put/wchar_t/12439_2.cc b/libstdc++-v3/testsuite/22_locale/time_put/put/wchar_t/12439_2.cc
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--- /dev/null
+++ b/libstdc++-v3/testsuite/22_locale/time_put/put/wchar_t/12439_2.cc
@@ -0,0 +1,59 @@
+// Copyright (C) 2003, 2009 Free Software Foundation
+//
+// 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/>.
+
+// 22.2.5.3.1 time_put members
+
+#include <locale>
+#include <sstream>
+#include <ctime>
+#include <cstring>
+#include <testsuite_hooks.h>
+
+// libstdc++/12439
+// time_put::put writes narrowed characters to output iterator
+void test02()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  typedef time_put<wchar_t> tp_type;
+  
+  const wchar_t fmt[] = {
+    0xa0, 0x103, 0xfc, 0xb3, 0xa0c3,
+    L'%', L'c'
+  };
+  
+  const size_t len = sizeof(fmt) / sizeof(fmt[0]);
+  const size_t cmplen = wcschr(fmt, L'%') - fmt;
+  
+  locale loc;
+  const tp_type& tp = use_facet<tp_type>(loc);
+  time_t tt = time(NULL);
+  wostringstream stream;
+  
+  tp.put(tp_type::iter_type(stream), stream, stream.fill(),
+	 localtime(&tt), fmt, fmt + len);
+  wstring str = stream.str();
+  VERIFY( str.length() >= cmplen );
+  VERIFY( !wmemcmp(str.data(), fmt, cmplen) );
+}
+
+int main()
+{
+  test02();
+  return 0;
+}