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diff --git a/libstdc++-v3/testsuite/22_locale/time_put/put/char/12439_3.cc b/libstdc++-v3/testsuite/22_locale/time_put/put/char/12439_3.cc
new file mode 100644
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+++ b/libstdc++-v3/testsuite/22_locale/time_put/put/char/12439_3.cc
@@ -0,0 +1,63 @@
+// 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
+
+// { dg-require-time "" }
+
+#include <locale>
+#include <sstream>
+#include <ctime>
+#include <testsuite_hooks.h>
+
+class TP : public std::time_put<char>
+{
+public:
+  mutable std::string format_chars;
+
+protected:
+  iter_type do_put(iter_type s, std::ios_base&, char_type,
+		   const std::tm*, char format, char) const
+  {
+    format_chars.push_back(format);
+    return s;
+  }
+};
+
+// libstdc++/12439
+// time_put::put reads past end of format string
+void test03()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+  
+  ostringstream stream;
+  time_t tt = time(NULL);
+  
+  const char* fmt = "%c";
+  
+  TP tp;
+  tp.put(TP::iter_type(stream), stream, stream.fill(), localtime(&tt),
+	 fmt, fmt + 1);
+  VERIFY( tp.format_chars.empty() );
+}
+
+int main()
+{
+  test03();
+  return 0;
+}