   import Inspect.Algebra
 
   def inspect(first..last, opts) do
-    concat [to_doc(first, opts), "..", to_doc(last, opts)]
+    concat([to_doc(first, opts), "..", to_doc(last, opts)])
   end
 end

  @type t :: %Range{first: integer, last: integer}
  @type t(first, last) :: %Range{first: first, last: last}


  @doc """
  Creates a new range.
  """


  def new(first, last) do
    raise ArgumentError,
          "ranges (first..last) expect both sides to be integers, " <>
            "got: #{inspect(first)}..#{inspect(last)}"
  end

  @doc """
