--- /dev/null
+// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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 <streambuf>
+#include <locale>
+#include <cstring>
+#include <testsuite_hooks.h>
+
+class MyTraits : public std::char_traits<char>
+{
+public:
+ static bool eq(char c1, char c2)
+ {
+ bool test __attribute__((unused)) = true;
+ VERIFY( c1 != 'X' );
+ VERIFY( c2 != 'X' );
+ return std::char_traits<char>::eq(c1, c2);
+ }
+};
+
+class MyBuf : public std::basic_streambuf<char, MyTraits>
+{
+ char buffer[8];
+
+public:
+ MyBuf()
+ {
+ std::memset(buffer, 'X', sizeof(buffer));
+ std::memset(buffer + 2, 'f', 4);
+ setg(buffer + 2, buffer + 2, buffer + 6);
+ }
+};
+
+// libstdc++/9538
+void test08()
+{
+ bool test __attribute__((unused)) = true;
+
+ MyBuf mb;
+ mb.sputbackc('a');
+}
+
+int main()
+{
+ test08();
+ return 0;
+}