if not outfile then
    error('failed to write to "'..State.filename..'"')

  if outfile == nil then

  if not outfile then

  if not outfile then

        local ok, err = result:open('r')
        if ok then
          return result
        else
          return ok, err
        end
      end
  App.open_for_writing =
      function(filename)

        local ok, err = result:open('w')
        if ok then
          return result
        else
          return ok, err
        end
      end