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diff --git a/dev/checker_printers.ml b/dev/checker_printers.ml
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+(************************************************************************)
+(*         *   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)         *)
+(************************************************************************)
+
+open Pp
+open Names
+open Univ
+
+let pp   x = Pp.pp_with Format.std_formatter x
+
+(** Future printer *)
+
+let ppfuture kx = pp (Future.print (fun _ -> str "_") kx)
+
+(* name printers *)
+let ppid id = pp (Id.print id)
+let pplab l = pp (Label.print l)
+let ppmbid mbid = pp (str (MBId.debug_to_string mbid))
+let ppdir dir = pp (DirPath.print dir)
+let ppmp mp = pp(str (ModPath.debug_to_string mp))
+let ppcon con = pp(Constant.debug_print con)
+let ppproj con = pp(Constant.debug_print (Projection.constant con))
+let ppkn kn = pp(str (KerName.to_string kn))
+let ppmind kn = pp(MutInd.debug_print kn)
+let ppind (kn,i) = pp(MutInd.debug_print kn ++ str"," ++int i)
+
+(* term printers *)
+let ppbigint n = pp (str (Bigint.to_string n));;
+
+let prset pr l = str "[" ++ hov 0 (prlist_with_sep spc pr l) ++ str "]"
+let ppintset l = pp (prset int (Int.Set.elements l))
+let ppidset l = pp (prset Id.print (Id.Set.elements l))
+
+let prset' pr l = str "[" ++ hov 0 (prlist_with_sep pr_comma pr l) ++ str "]"
+
+let pridmap pr l =
+  let pr (id,b) = Id.print id ++ str "=>" ++ pr id b in
+  prset' pr (Id.Map.fold (fun a b l -> (a,b)::l) l [])
+let ppidmap pr l = pp (pridmap pr l)
+
+let pridmapgen l =
+  let dom = Id.Set.elements (Id.Map.domain l) in
+  if dom = [] then str "[]" else
+  str "[domain= " ++ hov 0 (prlist_with_sep spc Id.print dom) ++ str "]"
+let ppidmapgen l = pp (pridmapgen l)
+
+let prididmap = pridmap (fun _ -> Id.print)
+let ppididmap = ppidmap (fun _ -> Id.print)
+
+let pP s = pp (hov 0 s)
+
+(* proof printers *)
+let ppuni u = pp(Universe.pr u)
+let ppuni_level u = pp (Level.pr u)
+
+let ppuniverse_set l = pp (LSet.pr l)
+let ppuniverse_instance l = pp (Instance.pr l)
+let ppauniverse_context l = pp (AUContext.pr Level.pr l)
+let ppuniverse_context l = pp (pr_universe_context Level.pr l)
+let ppconstraints c = pp (pr_constraints Level.pr c)
+let ppuniverse_context_future c =
+  let ctx = Future.force c in
+    ppuniverse_context ctx
+let ppuniverses u = pp (Univ.pr_universes u)
+
+let pploc x = let (l,r) = Loc.unloc x in
+  print_string"(";print_int l;print_string",";print_int r;print_string")"