Index: boost/optional/optional.hpp
===================================================================
--- boost/optional/optional.hpp	(revision 71419)
+++ boost/optional/optional.hpp	(working copy)
@@ -890,12 +890,12 @@
 
 template<class T>
 inline
-bool operator == ( none_t x, optional<T> const& y )
+bool operator == ( none_t, optional<T> const& y )
 { return equal_pointees(optional<T>() ,y); }
 
 template<class T>
 inline
-bool operator < ( none_t x, optional<T> const& y )
+bool operator < ( none_t, optional<T> const& y )
 { return less_pointees(optional<T>() ,y); }
 
 template<class T>