std::regex_replace behaviour (LWG DR 2213)

diff --git a/libstdc++-v3/include/bits/regex.tcc b/libstdc++-v3/include/bits/regex.tcc
index 73f55df..5fa1f01 100644
--- a/libstdc++-v3/include/bits/regex.tcc
+++ b/libstdc++-v3/include/bits/regex.tcc
@@ -425,7 +425,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	{
 	  auto& __sub = _Base_type::operator[](__idx);
 	  if (__sub.matched)
-	    std::copy(__sub.first, __sub.second, __out);
+	    __out = std::copy(__sub.first, __sub.second, __out);
 	};
 
       if (__flags & regex_constants::format_sed)
@@ -455,7 +455,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	      if (__next == __fmt_last)
 		break;
 
-	      std::copy(__fmt_first, __next, __out);
+	      __out = std::copy(__fmt_first, __next, __out);
 
 	      auto __eat = [&](char __ch) -> bool
 		{
@@ -493,7 +493,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 		*__out++ = '$';
 	      __fmt_first = __next;
 	    }
-	  std::copy(__fmt_first, __fmt_last, __out);
+	  __out = std::copy(__fmt_first, __fmt_last, __out);
 	}
       return __out;
     }
@@ -512,7 +512,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
       if (__i == __end)
 	{
 	  if (!(__flags & regex_constants::format_no_copy))
-	    std::copy(__first, __last, __out);
+	    __out = std::copy(__first, __last, __out);
 	}
       else
 	{
@@ -521,14 +521,15 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  for (; __i != __end; ++__i)
 	    {
 	      if (!(__flags & regex_constants::format_no_copy))
-		std::copy(__i->prefix().first, __i->prefix().second, __out);
+		__out = std::copy(__i->prefix().first, __i->prefix().second,
+				  __out);
 	      __out = __i->format(__out, __fmt, __fmt + __len, __flags);
 	      __last = __i->suffix();
 	      if (__flags & regex_constants::format_first_only)
 		break;
 	    }
 	  if (!(__flags & regex_constants::format_no_copy))
-	    std::copy(__last.first, __last.second, __out);
+	    __out = std::copy(__last.first, __last.second, __out);
 	}
       return __out;
     }
diff --git a/libstdc++-v3/testsuite/28_regex/algorithms/regex_replace/char/dr2213.cc b/libstdc++-v3/testsuite/28_regex/algorithms/regex_replace/char/dr2213.cc
new file mode 100644
index 0000000..b2aeac0
--- /dev/null
+++ b/libstdc++-v3/testsuite/28_regex/algorithms/regex_replace/char/dr2213.cc
@@ -0,0 +1,49 @@ 
+// { dg-options "-std=gnu++11" }
+
+//
+// Copyright (C) 2014 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/>.
+
+// 28.11.4 regex_replace
+// Tests ECMAScript regex_replace's _Out_iter return value.
+
+#include <regex>
+#include <testsuite_hooks.h>
+
+using namespace std;
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  char buff[4096] = {0};
+  regex re("asdf");
+  cmatch m;
+  string s = "asdf";
+  string res = "|asdf|asdf|";
+  VERIFY(regex_replace(buff, s.data(), s.data() + s.size(), re, "|&|\\0|",
+		       regex_constants::format_sed) == buff + res.size());
+  VERIFY(res == buff);
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/28_regex/match_results/format.cc b/libstdc++-v3/testsuite/28_regex/match_results/format.cc
index 11e3bdb..e71a232 100644
--- a/libstdc++-v3/testsuite/28_regex/match_results/format.cc
+++ b/libstdc++-v3/testsuite/28_regex/match_results/format.cc
@@ -45,9 +45,26 @@  test01()
 	 == "this is a string|a|string|is|this|\\");
 }
 
+void
+test02()
+{
+  bool test __attribute__((unused)) = true;
+
+  regex re("asdf");
+  cmatch m;
+  regex_match("asdf", m, re);
+  string fmt = "|&|\\0|";
+  char buff[4096] = {0};
+  string res = "|asdf|asdf|";
+  VERIFY(m.format(buff, fmt.data(), fmt.data() + fmt.size(),
+		  regex_constants::format_sed) == buff + res.size());
+  VERIFY(res == buff);
+}
+
 int
 main()
 {
   test01();
+  test02();
   return 0;
 }