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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+Require Import Coq.ltac2.Init.
+
+Ltac2 @ external equal : int -> int -> bool := "ltac2" "int_equal".
+Ltac2 @ external compare : int -> int -> int := "ltac2" "int_compare".
+Ltac2 @ external add : int -> int -> int := "ltac2" "int_add".
+Ltac2 @ external sub : int -> int -> int := "ltac2" "int_sub".
+Ltac2 @ external mul : int -> int -> int := "ltac2" "int_mul".
+Ltac2 @ external neg : int -> int := "ltac2" "int_neg".