diff --git a/include/boost/range/concepts.hpp b/include/boost/range/concepts.hpp
index 0732e26..5faf2de 100755
--- a/include/boost/range/concepts.hpp
+++ b/include/boost/range/concepts.hpp
@@ -76,8 +76,8 @@ namespace boost {
         }
         void const_constraints(const T& a)
         {
-            ci = boost::begin(a);
-            ci = boost::end(a);
+            //ci = boost::begin(a);
+            //ci = boost::end(a);
         }
         T a;
         range_iterator i;
@@ -121,8 +121,8 @@ namespace boost {
             }
         void const_constraints(const T& a)
         {
-            ci = boost::rbegin(a);
-            ci = boost::rend(a);
+            //ci = boost::rbegin(a);
+            //ci = boost::rend(a);
         }
         T a;
         range_reverse_iterator i;