--- /dev/null
+// Derived from libstdc++/12048 by LJR <ljrittle@acm.org> with
+// reminder from Petur Runolfsson <peturr02@ru.is>.
+
+// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 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/>.
+
+#include <iostream>
+#include <cwchar>
+#include <cstdio>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::freopen("cin_unget-1.txt", "r", stdin);
+
+ wchar_t buf[2];
+ VERIFY( std::wcin.rdbuf()->sgetn(buf, 2) == 2 );
+ std::wint_t c1 = std::wcin.rdbuf()->sungetc();
+ std::wint_t c2 = std::wcin.rdbuf()->sbumpc();
+ VERIFY( c1 == std::char_traits<wchar_t>::to_int_type(buf[1]) );
+ VERIFY( c2 == c1 );
+}
+
+int main(void)
+{
+ test01();
+ return 0;
+}