cleanup

src/visualization.cpp

@@ -387,7 +387,6 @@ proc visualize_lisp_machine() -> void {
 
         // create the lists-list by filtering the pairs-list.
         Lisp_Object_Array_List* pairs_to_filter = create_Lisp_Object_array_list();
-        Int_Array_List* indices_to_filter = create_Int_array_list();
 
         // helper lambda:
         proc remove_doubles_from_lisp_object_array_list = [&](Lisp_Object_Array_List* list) -> void {