Anonymous function inside pipeline breaks indentation

[lexmag]

Current:

    result =
      Enum.reverse(tail)
      |> Enum.into([head], fn
      {:improper, diff} ->
        [" | ", diff]
      diff ->
        [", ", diff]
    end)

Expected:

    result =
      Enum.reverse(tail)
      |> Enum.into([head], fn
        {:improper, diff} ->
          [" | ", diff]
        diff ->
          [", ", diff]
      end)

Version: 20160421.1312