--- /dev/null
+// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <sstream>
+#include <testsuite_hooks.h>
+
+// libstdc++/9439, libstdc++/9425
+// basic_filebuf<>::pbackfail calls basic_filebuf<>::seekoff, but
+// fails to check the return value
+void test09()
+{
+ using namespace std;
+ bool test __attribute__((unused)) = true;
+
+ stringbuf sbuf;
+ stringbuf::int_type r = sbuf.sputbackc('a');
+ VERIFY( r == stringbuf::traits_type::eof() );
+}
+
+int main()
+{
+ test09();
+ return 0;
+}