Source file `monad.ml`

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module type S = sig
  type 'a t
  val return : 'a -> 'a t
  val ( >>= ) : 'a t -> ('a -> 'b t) -> 'b t
end

module Id = struct
  type 'a t = 'a
  let return x = x
  let ( >>= ) x f = f x
end