obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
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if you have obtained the source via the command 'git clone',
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1 files changed, 70 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/13.cc b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/13.cc
new file mode 100644
index 000000000..ac5533a49
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/13.cc
@@ -0,0 +1,70 @@
+// 1999-04-12 bkoz
+
+// Copyright (C) 1999, 2000, 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/>.
+
+// 27.6.1.2.2 arithmetic extractors
+
+#include <istream>
+#include <sstream>
+#include <locale>
+#include <limits>
+#include <testsuite_hooks.h>
+
+// libstdc++/3720 part two
+void test13()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+  const char* l2 = "1.2345678901234567890123456789012345678901234567890123456"
+                   "  "
+                   "1246.9";
+
+  // 1 
+  // used to core.
+  double d;
+  istringstream iss1(l2);
+  iss1 >> d;
+  iss1 >> d;
+  VERIFY (d > 1246 && d < 1247);
+
+  // 2
+  // quick test for failbit on maximum length extraction.
+  int i;
+  int max_digits = numeric_limits<int>::digits10 + 1;
+  string digits;
+  for (int j = 0; j < max_digits; ++j)
+    digits += '1';
+  istringstream iss2(digits);
+  iss2 >> i;
+  VERIFY( !iss2.fail() );
+
+  digits += '1';
+  i = 0;
+  iss2.str(digits);
+  iss2.clear();
+  iss2 >> i;
+  VERIFY( i == numeric_limits<int>::max() );
+  VERIFY( iss2.fail() );
+}
+
+int main()
+{
+  test13();
+  return 0;
+}