Index: function_output_iterator.hpp
===================================================================
--- function_output_iterator.hpp	(revision 89044)
+++ function_output_iterator.hpp	(revision 89045)
@@ -30,7 +30,7 @@
     explicit function_output_iterator(const UnaryFunction& f)
       : m_f(f) {}
 
-    struct output_proxy {
+    struct output_proxy : noncopyable {
       output_proxy(UnaryFunction& f) : m_f(f) { }
       template <class T> output_proxy& operator=(const T& value) {
         m_f(value);