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diff --git a/boost/fusion/adapted/mpl/detail/begin_impl.hpp b/boost/fusion/adapted/mpl/detail/begin_impl.hpp
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+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2005-2006 Dan Marsden
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying 
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(BOOST_FUSION_BEGIN_IMPL_31122005_1209)
+#define BOOST_FUSION_BEGIN_IMPL_31122005_1209
+
+#include <boost/fusion/adapted/mpl/mpl_iterator.hpp>
+#include <boost/mpl/begin.hpp>
+#include <boost/type_traits/remove_const.hpp>
+
+namespace boost { namespace fusion {
+    
+    struct mpl_sequence_tag;
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct begin_impl;
+
+        template <>
+        struct begin_impl<mpl_sequence_tag>
+        {
+            template <typename Sequence>
+            struct apply 
+            {
+                typedef typename mpl::begin<
+                    typename remove_const<Sequence>::type
+                >::type iterator;
+                typedef mpl_iterator<iterator> type;
+                
+                static type
+                call(Sequence)
+                {
+                    return type();
+                }
+            };
+        };
+    }
+}}
+
+#endif