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    a = @net.read
    if a[0] == 255 then
      if a.length > 3 then
        @errno = a[1]+a[2]*256
        @error = a[3 .. -1]
      else
        @errno = Error::CR_UNKNOWN_ERROR
        @error = Error::err @errno
      end
      raise Error::new(@errno, @error)
    end