Library Stdlib.setoid_ring.NArithRing

From Stdlib Require Export Ring.
From Stdlib Require Import BinPos BinNat.
Import InitialRing.

Set Implicit Arguments.

Ltac Ncst t :=
  match isNcst t with
    true => t
  | _ => constr:(NotConstant)
  end.

Add Ring Nr : Nth (decidable Neqb_ok, constants [Ncst]).