     quote do
       warning =
         "the Behaviour module is deprecated. Instead of using this module, " <>
-        "use the @callback and @macrocallback module attributes. See the " <>
-        "documentation for Module for more information on these attributes"
+          "use the @callback and @macrocallback module attributes. See the " <>
+          "documentation for Module for more information on these attributes"
+
       IO.warn(warning)
 
       @doc false

      end

    case kind do
      :def -> quote(do: @callback unquote(spec))
      :defmacro -> quote(do: @macrocallback unquote(spec))
    end
  end


  Defines a macro callback according to the given type specification.
  """
  defmacro defmacrocallback(spec) do
    do_defcallback(:defmacro, split_spec(spec, quote(do: Macro.t())))
  end

  defp split_spec({:when, _, [{:::, _, [spec, return]}, guard]}, _default) do
