libstdc++/51960 move-construction for raw_storage_iterator

diff --git a/libstdc++-v3/doc/xml/manual/intro.xml b/libstdc++-v3/doc/xml/manual/intro.xml
index d02306e..238ab24 100644
--- a/libstdc++-v3/doc/xml/manual/intro.xml
+++ b/libstdc++-v3/doc/xml/manual/intro.xml
@@ -898,6 +898,12 @@  requirements of the license of GCC.
     <listitem><para>Adjust constraints to allow safe conversions.
     </para></listitem></varlistentry>
 
+    <varlistentry><term><link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="../ext/lwg-defects.html#2127">2127</link>:
+	<emphasis>Move-construction with <code>raw_storage_iterator</code></emphasis>
+    </term>
+    <listitem><para>Add assignment operator taking an rvalue.
+    </para></listitem></varlistentry>
+
     <varlistentry><term><link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="../ext/lwg-defects.html#2132">2132</link>:
 	<emphasis><code>std::function</code> ambiguity</emphasis>
     </term>
diff --git a/libstdc++-v3/include/bits/stl_raw_storage_iter.h b/libstdc++-v3/include/bits/stl_raw_storage_iter.h
index 8b5e793..2d29e7c 100644
--- a/libstdc++-v3/include/bits/stl_raw_storage_iter.h
+++ b/libstdc++-v3/include/bits/stl_raw_storage_iter.h
@@ -86,17 +86,28 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	return *this;
       }
 
-      raw_storage_iterator<_OutputIterator, _Tp>&
+#if __cplusplus >= 201103L
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 2127. Move-construction with raw_storage_iterator
+      raw_storage_iterator&
+      operator=(_Tp&& __element)
+      {
+	std::_Construct(std::__addressof(*_M_iter), std::move(__element));
+	return *this;
+      }
+#endif
+
+      raw_storage_iterator&
       operator++()
       {
 	++_M_iter;
 	return *this;
       }
 
-      raw_storage_iterator<_OutputIterator, _Tp>
+      raw_storage_iterator
       operator++(int)
       {
-	raw_storage_iterator<_OutputIterator, _Tp> __tmp = *this;
+	raw_storage_iterator __tmp = *this;
 	++_M_iter;
 	return __tmp;
       }
diff --git a/libstdc++-v3/testsuite/20_util/raw_storage_iterator/dr2127.cc b/libstdc++-v3/testsuite/20_util/raw_storage_iterator/dr2127.cc
new file mode 100644
index 0000000..9a084f6
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/raw_storage_iterator/dr2127.cc
@@ -0,0 +1,46 @@ 
+// Copyright (C) 2016 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/>.
+
+// { dg-do run { target c++11 } }
+
+#include <memory>
+#include <testsuite_hooks.h>
+
+struct MoveOnly
+{
+  MoveOnly(int i) : i(i) { }
+  MoveOnly(MoveOnly&&) = default;
+  int i;
+};
+
+void
+test01()
+{
+  char buf[sizeof(MoveOnly)*2];
+  MoveOnly* addr = (MoveOnly*)buf;
+  std::raw_storage_iterator<MoveOnly*, MoveOnly> iter(addr);
+  *iter++ = MoveOnly{1};
+  *iter++ = MoveOnly{2};
+  VERIFY( addr[0].i == 1 );
+  VERIFY( addr[1].i == 2 );
+}
+
+int
+main()
+{
+  test01();
+}