anchor.diff:      throw({bad_request, "unknown builtin filter name"}).
   
   filter_docids(DocIds, Style) when is_list(DocIds)->
  -    fun(#doc_info{id=DocId, revs=Revs}) ->
  +    fun(_Db, #doc_info{id=DocId, revs=Revs}) ->
               case lists:member(DocId, DocIds) of
                   true ->
                       builtin_results(Style, Revs);
  
positive.code:     case [list_to_binary(couch_httpd:unquote(Part))
              || Part <- string:tokens(FilterName, "/")] of
      [] ->
          fun(#doc_info{revs=Revs}) ->
                  builtin_results(Style, Revs)
          end;
      [DName, FName] ->
  
negative.code:             % validate that the ddoc has the filter fun
              #doc{body={Props}} = DDoc,
              couch_util:get_nested_json_value({Props}, [<<"views">>, VName]),
              fun(Db2, DocInfo) ->
                  DocInfos =
                  case Style of
                  main_only ->
  