--- a/src/pt-fvc-base.h
+++ b/src/pt-fvc-base.h
@@ -46,20 +46,28 @@
 tree_fvc : public tree_multi_val_ret
 {
 public:
-  tree_fvc (int l = -1, int c = -1) : tree_multi_val_ret (l, c) { }
+
+  tree_fvc (int l = -1, int c = -1)
+    : tree_multi_val_ret (l, c) { }
 
   ~tree_fvc (void) { }
 
-  virtual octave_value assign (octave_value& t,
-				const octave_value_list& args);
+#if 0
+  virtual octave_value& assign (const octave_value_list& args,
+				const octave_value& t); 
+#endif
 
   virtual string name (void) const;
 
-  virtual void bump_value (tree_expression::type);
+  virtual void increment (void);
 
+  virtual void decrement (void);
+
+#if 0
   virtual octave_value lookup_map_element (SLList<string>& list,
 					    bool insert = false,
 					    bool silent = false);
+#endif
 
   virtual string fcn_file_name (void)
     { return string (); }