(* -*- coq-prog-args: ("-emacs-U" "-R" "." "Prelude") -*- *)
(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(* Certified Haskell Prelude.
 * Author: Matthieu Sozeau
 * Institution: LRI, CNRS UMR 8623 - UniversitÃcopyright Paris Sud
 *              91405 Orsay, France *)

(* $Id: FSetAVL_prog.v 616 2007-08-08 12:28:10Z msozeau $ *)

Set Implicit Arguments.
Unset Strict Implicit.

Require Export Prelude.MonadZero.

Class MonadPlus `{MonadZero η} := {
  mplus : Π {α}, η α ---> η α ---> η α

; mplus_mzero :> Π α, Neutral (==) (fun x y => mplus (α:=α) x y) (mzero (α:=α)) }.

Notation " x `+` y " := (mplus x y) (at level 20).