anchor.diff:  %%     the new entity to the end of the export list.
   %%@spec add_to_export_after(attribute(), {function(), arity()},
   %%                        {function(), arity()}|none) -> attribute()
  +add_to_export(Node, FAtoAdd) ->
  +    add_to_export_after(Node, FAtoAdd, none).
   add_to_export_after(Node, FAtoAdd, FA) ->
       {F, A} = FAtoAdd,
       case is_attribute(Node, export) of
  
positive.code:                                                  wrangler_syntax:integer(A)),
              NewL=case FA of
                       none ->
                           lists:reverse([AQ|L]);
                       {F1,A1} ->
                           L0 = wrangler_syntax:list_elements(L),
                           L1 = lists:append([begin
                                                  FunName = wrangler_syntax:atom_value(
                                                                 wrangler_syntax:arity_qualifier_body(E)),
                                                  Arity = wrangler_syntax:integer_value(
                                                               wrangler_syntax:arity_qualifier_argument(E)),
                                                  case {FunName, Arity} of
                                                      {F1,A1} ->
                                                          [E, AQ];
  
negative.code:          mfa_to_fun_def/2,
           insert_an_attr/2,
           remove_from_import/2,
           add_to_export/2,
           add_to_export_after/3,
           pp/1,
           equal/2,
  