Source file either.ml

type ('a, 'b) t =
  | Left of 'a
  | Right of 'b

let map t ~l ~r =
  match t with
  | Left x -> l x
  | Right x -> r x

let left x = Left x

let right x = Right x

let to_dyn f g = function
  | Left a -> f a
  | Right b -> g b