(************************************************************************)
(*         *      The Rocq Prover / The Rocq Development Team           *)
(*  v      *         Copyright INRIA, CNRS and contributors             *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
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(** * Finite maps library *)
(** This functor derives additional facts from [FMapInterface.S]. These facts are mainly the specifications of [FMapInterface.S] written using different styles: equivalence and boolean equalities. *)
Require Export FMapInterface.
Set Implicit Arguments.
Unset Strict Implicit.
Local Ltac Tauto.intuition_solver ::= auto with bool map.
#[global]
Hint Extern 1 (Equivalence _) => constructor; congruence : core.
(** * Facts about weak maps *)
Module WFacts_fun (E:DecidableType)(Import M:WSfun E).
Notation eq_dec := E.eq_dec.
Definition eqb x y := if eq_dec x y then true else false.

Lemma eq_option_alt : forall (elt:Type)(o o':option elt),
o=o' <-> (forall e, o=Some e <-> o'=Some e).