anchor.diff:      end,
       DDocs = lists:filter(Pred, DDocs0),
       Special = special(Db),
  -    Special ++ lists:flatmap(fun(Doc) ->
  +    {ok, Special ++ lists:flatmap(fun(Doc) ->
           from_ddoc(Db, Doc)
  -    end, DDocs).
  +    end, DDocs)}.
   
   
   new(Db, Opts) ->
  
positive.code: 
  
  list(Db) ->
      {ok, DDocs0} = mango_util:open_ddocs(Db),
      Pred = fun({Props}) ->
          case proplists:get_value(<<"language">>, Props) of
  
negative.code: 
  -export([
      list/1,
      recover/1,
  
      new/2,
      validate/1,
  