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diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/inserters_extractors/wchar_t/6.cc b/libstdc++-v3/testsuite/21_strings/basic_string/inserters_extractors/wchar_t/6.cc
new file mode 100644
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+++ b/libstdc++-v3/testsuite/21_strings/basic_string/inserters_extractors/wchar_t/6.cc
@@ -0,0 +1,61 @@
+// 1999-07-01 bkoz
+
+// Copyright (C) 1999, 2000, 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/>.
+
+// 21.3.7.9 inserters and extractors
+
+// NB: This file is predicated on sstreams, istreams, and ostreams
+// working, not to mention other major details like char_traits, and
+// all of the string class.
+
+#include <string>
+#include <sstream>
+#include <testsuite_hooks.h>
+
+// istringstream/stringbuf extractor properly size buffer based on
+// actual, not allocated contents (string.size() vs. string.capacity()).
+// http://gcc.gnu.org/ml/libstdc++/1999-q4/msg00049.html
+void test06(void)
+{
+  bool test __attribute__((unused)) = true;
+
+  typedef std::wstring::size_type size_type;
+  std::wstring str01(L"@silent");
+  size_type i01 = str01.size();
+  size_type i02 = str01.capacity();
+  str01.erase(0, 1);
+  size_type i03 = str01.size();
+  size_type i04 = str01.capacity();
+  VERIFY( i01 - 1 == i03 );
+  VERIFY( i02 >= i04 );
+
+  std::wistringstream is(str01);
+  std::wstring str02;
+  is >> str02 >> std::ws;
+  size_type i05 = str02.size();
+  size_type i06 = str02.capacity();
+  VERIFY( i05 == i03 );
+  VERIFY( i06 <= i04 );
+}
+
+int main()
+{ 
+  test06();
+  return 0;
+}