       |> IO.inspect(label: "before")
       |> Enum.map(&(&1 * 2))
       |> IO.inspect(label: "after")
-      |> Enum.sum
+      |> Enum.sum()
 
   Prints:
 


  ## Examples

      IO.write "sample"
      #=> sample

      IO.write :stderr, "error"
      #=> error

  """


  ## Examples

      IO.puts("Hello World!")
      #=> Hello World!

      IO.puts(:stderr, "error")
      #=> error

  """
