Fix missed merge from 6338

[SVN r76791]

include/boost/fusion/view/iterator_range/detail/at_impl.hpp

@@ -33,7 +33,7 @@ namespace boost { namespace fusion
                 static type
                 call(Seq& s)
                 {
-                    return * advance<N>(s.first);
+                    return * fusion::advance<N>(s.first);
                 }
             };
         };

include/boost/fusion/view/iterator_range/detail/segmented_iterator_range.hpp

@@ -39,11 +39,18 @@ namespace boost { namespace fusion
     {
         template <typename Sequence, typename T>
         struct push_back;
+
+        template <typename Sequence, typename T>
+        struct push_front;
     }
 
     template <typename Sequence, typename T>
     typename result_of::push_back<Sequence const, T>::type
     push_back(Sequence const& seq, T const& x);
+
+    template <typename Sequence, typename T>
+    typename result_of::push_front<Sequence const, T>::type
+    push_front(Sequence const& seq, T const& x);
 }}
 
 namespace boost { namespace fusion { namespace detail