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diff --git a/kernel/cPrimitives.ml b/kernel/cPrimitives.ml
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+++ b/kernel/cPrimitives.ml
@@ -0,0 +1,93 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \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)         *)
+(************************************************************************)
+
+type t =
+  | Int31head0
+  | Int31tail0
+  | Int31add
+  | Int31sub
+  | Int31mul
+  | Int31div
+  | Int31mod
+(*
+  | Int31lsr
+  | Int31lsl
+ *)
+  | Int31land
+  | Int31lor
+  | Int31lxor
+  | Int31addc
+  | Int31subc
+  | Int31addcarryc
+  | Int31subcarryc
+  | Int31mulc
+  | Int31diveucl
+  | Int31div21
+  | Int31addmuldiv
+  | Int31eq
+  | Int31lt
+  | Int31le
+  | Int31compare
+
+let hash = function
+  | Int31head0 -> 1
+  | Int31tail0 -> 2
+  | Int31add -> 3
+  | Int31sub -> 4
+  | Int31mul -> 5
+  | Int31div -> 6
+  | Int31mod -> 7
+(*
+  | Int31lsr -> 8
+  | Int31lsl -> 9
+ *)
+  | Int31land -> 10
+  | Int31lor -> 11
+  | Int31lxor -> 12
+  | Int31addc -> 13
+  | Int31subc -> 14
+  | Int31addcarryc -> 15
+  | Int31subcarryc -> 16
+  | Int31mulc -> 17
+  | Int31diveucl -> 18
+  | Int31div21 -> 19
+  | Int31addmuldiv -> 20
+  | Int31eq -> 21
+  | Int31lt -> 22
+  | Int31le -> 23
+  | Int31compare -> 24
+
+let to_string = function
+  | Int31head0 -> "head0"
+  | Int31tail0 -> "tail0"
+  | Int31add -> "add"
+  | Int31sub -> "sub"
+  | Int31mul -> "mul"
+  | Int31div -> "div"
+  | Int31mod -> "mod"
+(*
+  | Int31lsr -> "l_sr"
+  | Int31lsl -> "l_sl"
+ *)
+  | Int31land -> "l_and"
+  | Int31lor -> "l_or"
+  | Int31lxor -> "l_xor"
+  | Int31addc -> "addc"
+  | Int31subc -> "subc"
+  | Int31addcarryc -> "addcarryc"
+  | Int31subcarryc -> "subcarryc"
+  | Int31mulc -> "mulc"
+  | Int31diveucl -> "diveucl"
+  | Int31div21 -> "div21"
+  | Int31addmuldiv -> "addmuldiv"
+  | Int31eq -> "eq"
+  | Int31lt -> "lt"
+  | Int31le -> "le"
+  | Int31compare -> "compare"