(************************************************************************)
(*  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        *)
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(* 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.Monad.

(* FIXME: bug with notations *)

Class MonadZero `{M : Monad η} := {
  mzero : forall {α}, η α ;

  mzero_bind_left :> Π α β, LeftAbsorbant (==) bind (@mzero α) (@mzero β) ;
  mzero_bind_right :> Π α β, RightAbsorbant (==) (bind (α:=α)) (constS mzero) (@mzero β) }.