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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/close/12790-1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/close/12790-1.cc
new file mode 100644
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+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/close/12790-1.cc
@@ -0,0 +1,79 @@
+// Copyright (C) 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/>.
+
+// 27.8.1.3 filebuf member functions
+
+// { dg-require-fileio "" }
+
+#include <locale>
+#include <fstream>
+#include <testsuite_hooks.h>
+#include <testsuite_character.h>
+
+// libstdc++/12790
+void test01()
+{
+  using namespace std;
+  using __gnu_test::pod_uchar;
+  typedef basic_filebuf<pod_uchar>::traits_type traits_type;
+
+  bool test __attribute__((unused)) = true;
+  const char* name = "tmp_close_12790";
+
+  locale loc(locale::classic(),
+	     new codecvt<traits_type::char_type, char,
+	     traits_type::state_type>);
+
+  basic_filebuf<pod_uchar> fb;
+  fb.pubsetbuf(0, 0);
+  fb.pubimbue(loc);
+
+  fb.open(name, ios_base::out | ios_base::trunc);
+  fb.sputc(pod_uchar::from<char>('b'));
+  fb.sputc(pod_uchar::from<char>(0xff));
+  fb.sputc(pod_uchar::from<char>(0));
+
+  // Check that close() writes unshift sequence
+  fb.close();
+
+  fb.open(name, ios_base::in | ios_base::out | ios_base::ate);
+
+  fb.sputc(pod_uchar::from<char>('a'));
+  fb.sputc(pod_uchar::from<char>(0xff));
+  fb.sputc(pod_uchar::from<char>(0));
+
+  fb.close();
+
+  fb.open(name, ios_base::in);
+
+  fb.sbumpc();
+  fb.sbumpc();
+  fb.sbumpc();
+
+  traits_type::int_type c = fb.sbumpc();
+  VERIFY( c != traits_type::eof() );
+  VERIFY( traits_type::eq(traits_type::to_char_type(c),
+			  pod_uchar::from<char>('a')) );
+
+  fb.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}