       acc, :done ->
         acc
 
-      _, :halt ->
+      _acc, :halt ->
         :ok
     end
 

      map_acc, :done ->
        map_acc

      _, :halt ->
        :ok
    end


      acc, :done ->
        IO.iodata_to_binary(acc)

      __acc, :halt ->
        :ok
    end

