1.1 --- a/lemon/concepts/path.h	Wed Oct 17 19:14:07 2018 +0200
     1.2 +++ b/lemon/concepts/path.h	Thu Nov 01 11:27:05 2018 +0100
     1.3 @@ -70,7 +70,9 @@
     1.4  
     1.5        /// \brief Template copy constructor
     1.6        template <typename CPath>
     1.7 -      Path(const CPath& cpath) {}
     1.8 +      Path(const CPath& cpath) {
     1.9 +        ::lemon::ignore_unused_variable_warning(cpath);
    1.10 +      }
    1.11  
    1.12        /// \brief Template assigment operator
    1.13        template <typename CPath>