diff -r e7f8647ce760 -r e9b4fbe163f5 lemon/concepts/path.h
--- a/lemon/concepts/path.h	Mon Jul 14 15:23:11 2008 +0100
+++ b/lemon/concepts/path.h	Fri Sep 26 09:52:28 2008 +0200
@@ -65,7 +65,10 @@
 
       /// \brief Template assigment
       template <typename CPath>
-      Path& operator=(const CPath& cpath) {}
+      Path& operator=(const CPath& cpath) {
+        ignore_unused_variable_warning(cpath);
+        return *this;
+      }
 
       /// Length of the path ie. the number of arcs in the path.
       int length() const { return 0;}