   """
   @spec list :: [port]
   def list do
-    :erlang.ports
+    :erlang.ports()
   end
 
   @compile {:inline, nillify: 1}
   defp nillify(:undefined), do: nil
-  defp nillify(other),      do: other
+  defp nillify(other), do: other
 end

      done
      kill -KILL $pid


  Now instead of:

      Port.open({:spawn_executable, "/path/to/program"},

  end

  def info(port, item) do
    nillify(:erlang.port_info(port, item))
  end

  @doc """
