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(************************************************************************)
(* 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 *)
(************************************************************************)
Require Export Ring.
Require Import ZArith_base.
Import InitialRing.
Set Implicit Arguments.
Ltac isZcst t :=
let t := eval hnf in t in
match t with
Z0 => constr:true
| Zpos ?p => isZcst p
| Zneg ?p => isZcst p
| xI ?p => isZcst p
| xO ?p => isZcst p
| xH => constr:true
| _ => constr:false
end.
Ltac Zcst t :=
match isZcst t with
true => t
| _ => NotConstant
end.
Add Ring Zr : Zth
(decidable Zeqb_ok, constants [Zcst], preprocess [unfold Zsucc]).
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