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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+type t = int
+
+let repr x = x
+let unsafe_of_int x = x
+let compare = Int.compare
+let equal = Int.equal
+let hash = Int.hash
+
+module Set = Int.Set
+module Map = Int.Map