(*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *)

(** Pretty-printer for argument type. *)
type 'a pp = Format.formatter -> 'a -> unit

(** Format strings. *)
type ('a, 'b) fmt = ('a, 'b) Trace.fmt

module Sexp = Sexplib.Sexp

module type Applicative_syntax = sig
  type 'a t

  val ( let+ ) : 'a t -> ('a -> 'b) -> 'b t
  val ( and+ ) : 'a t -> 'b t -> ('a * 'b) t
end

module type Monad_syntax = sig
  include Applicative_syntax

  val ( let* ) : 'a t -> ('a -> 'b t) -> 'b t
  val ( and* ) : 'a t -> 'b t -> ('a * 'b) t
end

module type OrderedType = sig
  type t

  val compare : t -> t -> int
  val sexp_of_t : t -> Sexp.t
end

exception Duplicate