Expressions

- Any "exp" arguments are given the "exp" type (_second) as well as
  "exp" category (_third).

src/Arguments.cpp

@@ -482,6 +482,7 @@ void Arguments::categorize ()
         if (command_pos != -1)
           ++distance_from_command;
 
+        arg->_second = "exp";
         arg->_third  = "exp";
       }