BangPipe - a really silly Elixir macro

bangpipe.exs

Interactive Elixir (1.5.1) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> defmodule Bangpipe do
...(1)>   defmacro left <|> right do
...(1)>     quote do
...(1)>       unquote(left)
...(1)>       |> case do
...(1)>           {:ok, val} -> val
...(1)>           val -> val
...(1)>          end
...(1)>       |> unquote(right)
...(1)>     end
...(1)>   end
...(1)> end
{:module, Bangpipe,
 <<70, 79, 82, 49, 0, 0, 4, 128, 66, 69, 65, 77, 65, 116, 85, 56, 0, 0, 0, 94,
   0, 0, 0, 9, 15, 69, 108, 105, 120, 105, 114, 46, 66, 97, 110, 103, 112, 105,
   112, 101, 8, 95, 95, 105, 110, 102, 111, ...>>, {:<|>, 2}}
iex(2)> import Bangpipe
Bangpipe
iex(3)> {:ok, [1,2,3,4]} <|> Enum.sum()
10
iex(4)>