Imported Upstream version 8.9.0upstream/8.9.0upstream

1 files changed, 0 insertions, 1484 deletions

diff --git a/plugins/ssrmatching/ssrmatching.ml4 b/plugins/ssrmatching/ssrmatching.ml4
deleted file mode 100644
index 307bc21a..00000000
--- a/plugins/ssrmatching/ssrmatching.ml4
+++ /dev/null
@@ -1,1484 +0,0 @@
-(************************************************************************)
-(*         *   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)         *)
-(************************************************************************)
-
-(* This file is (C) Copyright 2006-2015 Microsoft Corporation and Inria. *)
-
-(* Defining grammar rules with "xx" in it automatically declares keywords too,
- * we thus save the lexer to restore it at the end of the file *)
-let frozen_lexer = CLexer.get_keyword_state () ;;
-
-open Ltac_plugin
-open Names
-open Pp
-open Genarg
-open Stdarg
-open Term
-module CoqConstr = Constr
-open CoqConstr
-open Pcoq
-open Pcoq.Constr
-open Vars
-open Libnames
-open Tactics
-open Tacticals
-open Termops
-open Recordops
-open Tacmach
-open Glob_term
-open Util
-open Evd
-open Tacexpr
-open Tacinterp
-open Pretyping
-open Ppconstr
-open Printer
-open Globnames
-open Misctypes
-open Decl_kinds
-open Evar_kinds
-open Constrexpr
-open Constrexpr_ops
-
-DECLARE PLUGIN "ssrmatching_plugin"
-
-let errorstrm = CErrors.user_err ~hdr:"ssrmatching"
-let loc_error loc msg = CErrors.user_err ?loc ~hdr:msg (str msg)
-let ppnl = Feedback.msg_info
-
-(* 0 cost pp function. Active only if env variable SSRDEBUG is set *)
-(* or if SsrDebug is Set                                                  *)
-let pp_ref = ref (fun _ -> ())
-let ssr_pp s = Feedback.msg_debug (str"SSR: "++Lazy.force s)
-let _ =
-  try ignore(Sys.getenv "SSRMATCHINGDEBUG"); pp_ref := ssr_pp
-  with Not_found -> ()
-let debug b =
-  if b then pp_ref := ssr_pp else pp_ref := fun _ -> ()
-let _ =
-  Goptions.declare_bool_option
-    { Goptions.optname  = "ssrmatching debugging";
-      Goptions.optkey   = ["Debug";"SsrMatching"];
-      Goptions.optdepr  = false;
-      Goptions.optread  = (fun _ -> !pp_ref == ssr_pp);
-      Goptions.optwrite = debug }
-let pp s = !pp_ref s
-
-(** Utils *)(* {{{ *****************************************************************)
-let env_size env = List.length (Environ.named_context env)
-let safeDestApp c =
-  match kind c with App (f, a) -> f, a | _ -> c, [| |]
-(* Toplevel constr must be globalized twice ! *)
-let glob_constr ist genv sigma t = match t, ist with
-  | (_, Some ce), Some ist ->
-    let vars = Id.Map.fold (fun x _ accu -> Id.Set.add x accu) ist.lfun Id.Set.empty in
-    let ltacvars = { Constrintern.empty_ltac_sign with Constrintern.ltac_vars = vars } in
-    Constrintern.intern_gen WithoutTypeConstraint ~ltacvars:ltacvars genv sigma ce
-  | (rc, None), _ -> rc
-  | (_, Some _), None -> CErrors.anomaly Pp.(str"glob_constr: term with no ist")
-
-(* Term printing utilities functions for deciding bracketing.  *)
-let pr_paren prx x = hov 1 (str "(" ++ prx x ++ str ")")
-(* String lexing utilities *)
-let skip_wschars s =
-  let rec loop i = match s.[i] with '\n'..' ' -> loop (i + 1) | _ -> i in loop
-(* We also guard characters that might interfere with the ssreflect   *)
-(* tactic syntax.                                                     *)
-let guard_term ch1 s i = match s.[i] with
-  | '(' -> false
-  | '{' | '/' | '=' -> true
-  | _ -> ch1 = '('
-(* The call 'guard s i' should return true if the contents of s *)
-(* starting at i need bracketing to avoid ambiguities.          *)
-let pr_guarded guard prc c =
-  let s = Pp.string_of_ppcmds (prc c) ^ "$" in
-  if guard s (skip_wschars s 0) then pr_paren prc c else prc c
-(* More sensible names for constr printers *)
-let prl_glob_constr c = pr_lglob_constr_env (Global.env ()) c
-let pr_glob_constr c = pr_glob_constr_env (Global.env ()) c
-let prl_constr_expr = pr_lconstr_expr
-let pr_constr_expr = pr_constr_expr
-let prl_glob_constr_and_expr = function
-  | _, Some c -> prl_constr_expr c
-  | c, None -> prl_glob_constr c
-let pr_glob_constr_and_expr = function
-  | _, Some c -> pr_constr_expr c
-  | c, None -> pr_glob_constr c
-let pr_term (k, c, _) = pr_guarded (guard_term k) pr_glob_constr_and_expr c
-let prl_term (k, c, _) = pr_guarded (guard_term k) prl_glob_constr_and_expr c
-
-(** Adding a new uninterpreted generic argument type *)
-let add_genarg tag pr =
-  let wit = Genarg.make0 tag in
-  let tag = Geninterp.Val.create tag in
-  let glob ist x = (ist, x) in
-  let subst _ x = x in
-  let interp ist x = Ftactic.return (Geninterp.Val.Dyn (tag, x)) in
-  let gen_pr _ _ _ = pr in
-  let () = Genintern.register_intern0 wit glob in
-  let () = Genintern.register_subst0 wit subst in
-  let () = Geninterp.register_interp0 wit interp in
-  let () = Geninterp.register_val0 wit (Some (Geninterp.Val.Base tag)) in
-  Pptactic.declare_extra_genarg_pprule wit gen_pr gen_pr gen_pr;
-  wit
-
-(** Constructors for cast type *)
-let dC t = CastConv t
-(** Constructors for constr_expr *)
-let isCVar   = function { CAst.v = CRef ({CAst.v=Ident _},_) } -> true | _ -> false
-let destCVar = function { CAst.v = CRef ({CAst.v=Ident id},_) } -> id | _ ->
-  CErrors.anomaly (str"not a CRef.")
-let isGLambda c = match DAst.get c with GLambda (Name _, _, _, _) -> true | _ -> false
-let destGLambda c = match DAst.get c with GLambda (Name id, _, _, c) -> (id, c)
-  | _ -> CErrors.anomaly (str "not a GLambda")
-let isGHole c = match DAst.get c with GHole _ -> true | _ -> false
-let mkCHole ~loc = CAst.make ?loc @@ CHole (None, IntroAnonymous, None)
-let mkCLambda ?loc name ty t = CAst.make ?loc @@
-   CLambdaN ([CLocalAssum([CAst.make ?loc name], Default Explicit, ty)], t)
-let mkCLetIn ?loc name bo t = CAst.make ?loc @@
-   CLetIn ((CAst.make ?loc name), bo, None, t)
-let mkCCast ?loc t ty = CAst.make ?loc @@ CCast (t, dC ty)
-(** Constructors for rawconstr *)
-let mkRHole = DAst.make @@ GHole (InternalHole, IntroAnonymous, None)
-let mkRApp f args = if args = [] then f else DAst.make @@ GApp (f, args)
-let mkRCast rc rt =  DAst.make @@ GCast (rc, dC rt)
-let mkRLambda n s t = DAst.make @@ GLambda (n, Explicit, s, t)
-
-(* ssrterm conbinators *)
-let combineCG t1 t2 f g =
- let mk_ist i1 i2 = match i1, i2 with
- | None, Some i -> Some i
- | Some i, None -> Some i
- | None, None -> None
- | Some i, Some j when i == j -> Some i
- | _ -> CErrors.anomaly (Pp.str "combineCG: different ist") in
- match t1, t2 with
- | (x, (t1, None), i1), (_, (t2, None), i2) ->
-      x, (g t1 t2, None), mk_ist i1 i2
- | (x, (_, Some t1), i1), (_, (_, Some t2), i2) ->
-      x, (mkRHole, Some (f t1 t2)), mk_ist i1 i2
- | _, (_, (_, None), _) -> CErrors.anomaly (str"have: mixed C-G constr.")
- | _ -> CErrors.anomaly (str"have: mixed G-C constr.")
-let loc_ofCG = function
- | (_, (s, None), _) -> Glob_ops.loc_of_glob_constr s
- | (_, (_, Some s), _) -> Constrexpr_ops.constr_loc s
-
-let mk_term k c ist = k, (mkRHole, Some c), ist
-let mk_lterm = mk_term ' '
-
-let pf_type_of gl t = let sigma, ty = pf_type_of gl t in re_sig (sig_it gl)  sigma, ty
-
-let nf_evar sigma c =
-  EConstr.Unsafe.to_constr (Evarutil.nf_evar sigma (EConstr.of_constr c))
-
-(* }}} *)
-
-(** Profiling *)(* {{{ *************************************************************)
-type profiler = { 
-  profile : 'a 'b. ('a -> 'b) -> 'a -> 'b;
-  reset : unit -> unit;
-  print : unit -> unit }
-let profile_now = ref false
-let something_profiled = ref false
-let profilers = ref []
-let add_profiler f = profilers := f :: !profilers;;
-let profile b =
-  profile_now := b;
-  if b then List.iter (fun f -> f.reset ()) !profilers;
-  if not b then List.iter (fun f -> f.print ()) !profilers
-;;
-let _ =
-  Goptions.declare_bool_option
-    { Goptions.optname  = "ssrmatching profiling";
-      Goptions.optkey   = ["SsrMatchingProfiling"];
-      Goptions.optread  = (fun _ -> !profile_now);
-      Goptions.optdepr  = false;
-      Goptions.optwrite = profile }
-let () =
-  let prof_total = 
-    let init = ref 0.0 in { 
-    profile = (fun f x -> assert false);
-    reset = (fun () -> init := Unix.gettimeofday ());
-    print = (fun () -> if !something_profiled then
-        prerr_endline 
-           (Printf.sprintf "!! %-39s %10d %9.4f %9.4f %9.4f"
-           "total" 0 (Unix.gettimeofday() -. !init) 0.0 0.0)) } in
-  let prof_legenda = {
-    profile = (fun f x -> assert false);
-    reset = (fun () -> ());
-    print = (fun () -> if !something_profiled then begin
-        prerr_endline 
-           (Printf.sprintf "!! %39s ---------- --------- --------- ---------" 
-           (String.make 39 '-'));
-        prerr_endline 
-           (Printf.sprintf "!! %-39s %10s %9s %9s %9s" 
-           "function" "#calls" "total" "max" "average") end) } in
-  add_profiler prof_legenda;
-  add_profiler prof_total
-;;
-
-let mk_profiler s =
-  let total, calls, max = ref 0.0, ref 0, ref 0.0 in
-  let reset () = total := 0.0; calls := 0; max := 0.0 in
-  let profile f x =
-    if not !profile_now then f x else
-    let before = Unix.gettimeofday () in
-    try
-      incr calls;
-      let res = f x in
-      let after = Unix.gettimeofday () in
-      let delta = after -. before in
-      total := !total +. delta;
-      if delta > !max then max := delta;
-      res
-    with exc ->
-      let after = Unix.gettimeofday () in
-      let delta = after -. before in
-      total := !total +. delta;
-      if delta > !max then max := delta;
-      raise exc in
-  let print () =
-     if !calls <> 0 then begin
-       something_profiled := true;
-       prerr_endline
-         (Printf.sprintf "!! %-39s %10d %9.4f %9.4f %9.4f" 
-         s !calls !total !max (!total /. (float_of_int !calls))) end in
-  let prof = { profile = profile; reset = reset; print = print } in
-  add_profiler prof;
-  prof
-;;
-(* }}} *)
-
-exception NoProgress
-
-(** Unification procedures.                                *)
-
-(* To enforce the rigidity of the rooted match we always split  *)
-(* top applications, so the unification procedures operate on   *)
-(* arrays of patterns and terms.                                *)
-(* We perform three kinds of unification:                       *)
-(*  EQ: exact conversion check                                  *)
-(*  FO: first-order unification of evars, without conversion    *)
-(*  HO: higher-order unification with conversion                *)
-(* The subterm unification strategy is to find the first FO     *)
-(* match, if possible, and the first HO match otherwise, then   *)
-(* compute all the occurrences that are EQ matches for the      *)
-(* relevant subterm.                                            *)
-(*   Additional twists:                                         *)
-(*    - If FO/HO fails then we attempt to fill evars using      *)
-(*      typeclasses before raising an outright error. We also   *)
-(*      fill typeclasses even after a successful match, since   *)
-(*      beta-reduction and canonical instances may leave        *)
-(*      undefined evars.                                        *)
-(*    - We do postchecks to rule out matches that are not       *)
-(*      closed or that assign to a global evar; these can be    *)
-(*      disabled for rewrite or dependent family matches.       *)
-(*    - We do a full FO scan before turning to HO, as the FO    *)
-(*      comparison can be much faster than the HO one.          *)
-
-let unif_EQ env sigma p c =
-  let evars = existential_opt_value sigma, Evd.universes sigma in 
-  try let _ = Reduction.conv env p ~evars c in true with _ -> false
-
-let unif_EQ_args env sigma pa a =
-  let n = Array.length pa in
-  let rec loop i = (i = n) || unif_EQ env sigma pa.(i) a.(i) && loop (i + 1) in
-  loop 0
-
-let prof_unif_eq_args = mk_profiler "unif_EQ_args";;
-let unif_EQ_args env sigma pa a =
-  prof_unif_eq_args.profile (unif_EQ_args env sigma pa) a 
-;;
-
-let unif_HO env ise p c =
-  try Evarconv.the_conv_x env p c ise
-  with Evarconv.UnableToUnify(ise, err) ->
-    raise Pretype_errors.(PretypeError(env,ise,CannotUnify(p,c,Some err)))
-
-let unif_HO_args env ise0 pa i ca =
-  let n = Array.length pa in
-  let rec loop ise j =
-    if j = n then ise else loop (unif_HO env ise (EConstr.of_constr pa.(j)) (EConstr.of_constr ca.(i + j))) (j + 1) in
-  loop ise0 0
-
-(* FO unification should boil down to calling w_unify with no_delta, but  *)
-(* alas things are not so simple: w_unify does partial type-checking,     *)
-(* which breaks down when the no-delta flag is on (as the Coq type system *)
-(* requires full convertibility. The workaround here is to convert all    *)
-(* evars into metas, since 8.2 does not TC metas. This means some lossage *)
-(* for HO evars, though hopefully Miller patterns can pick up some of     *)
-(* those cases, and HO matching will mop up the rest.                     *)
-let flags_FO =
-  let flags =
-    { (Unification.default_no_delta_unify_flags ()).Unification.core_unify_flags
-      with
-        Unification.modulo_conv_on_closed_terms = None;
-        Unification.modulo_eta = true;
-        Unification.modulo_betaiota = true;
-        Unification.modulo_delta_types = full_transparent_state}
-  in
-  { Unification.core_unify_flags = flags;
-    Unification.merge_unify_flags = flags;
-    Unification.subterm_unify_flags = flags;
-    Unification.allow_K_in_toplevel_higher_order_unification = false;
-    Unification.resolve_evars =
-      (Unification.default_no_delta_unify_flags ()).Unification.resolve_evars
-  }
-let unif_FO env ise p c =
-  Unification.w_unify env ise Reduction.CONV ~flags:flags_FO (EConstr.of_constr p) (EConstr.of_constr c)
-
-(* Perform evar substitution in main term and prune substitution. *)
-let nf_open_term sigma0 ise c =
-  let c = EConstr.Unsafe.to_constr c in
-  let s = ise and s' = ref sigma0 in
-  let rec nf c' = match kind c' with
-  | Evar ex ->
-    begin try nf (existential_value s ex) with _ ->
-    let k, a = ex in let a' = Array.map nf a in
-    if not (Evd.mem !s' k) then
-      s' := Evd.add !s' k (Evarutil.nf_evar_info s (Evd.find s k));
-    mkEvar (k, a')
-    end
-  | _ -> map nf c' in
-  let copy_def k evi () =
-    if evar_body evi != Evd.Evar_empty then () else
-    match Evd.evar_body (Evd.find s k) with
-    | Evar_defined c' -> s' := Evd.define k (nf c') !s'
-    | _ -> () in
-  let c' = nf c in let _ = Evd.fold copy_def sigma0 () in
-  !s', Evd.evar_universe_context s, EConstr.of_constr c'
-
-let unif_end env sigma0 ise0 pt ok =
-  let ise = Evarconv.solve_unif_constraints_with_heuristics env ise0 in
-  let s, uc, t = nf_open_term sigma0 ise pt in
-  let ise1 = create_evar_defs s in
-  let ise1 = Evd.set_universe_context ise1 uc in
-  let ise2 = Typeclasses.resolve_typeclasses ~fail:true env ise1 in
-  if not (ok ise) then raise NoProgress else
-  if ise2 == ise1 then (s, uc, t)
-  else
-    let s, uc', t = nf_open_term sigma0 ise2 t in
-    s, UState.union uc uc', t
-
-let unify_HO env sigma0 t1 t2 =
-  let sigma = unif_HO env sigma0 t1 t2 in
-  let sigma, uc, _ = unif_end env sigma0 sigma t2 (fun _ -> true) in
-  Evd.set_universe_context sigma uc
-
-let pf_unify_HO gl t1 t2 =
-  let env, sigma0, si = pf_env gl, project gl, sig_it gl in
-  let sigma = unify_HO env sigma0 t1 t2 in
-  re_sig si sigma
-
-(* This is what the definition of iter_constr should be... *)
-let iter_constr_LR f c = match kind c with
-  | Evar (k, a) -> Array.iter f a
-  | Cast (cc, _, t) -> f cc; f t  
-  | Prod (_, t, b) | Lambda (_, t, b)  -> f t; f b
-  | LetIn (_, v, t, b) -> f v; f t; f b
-  | App (cf, a) -> f cf; Array.iter f a
-  | Case (_, p, v, b) -> f v; f p; Array.iter f b
-  | Fix (_, (_, t, b)) | CoFix (_, (_, t, b)) ->
-    for i = 0 to Array.length t - 1 do f t.(i); f b.(i) done
-  | Proj(_,a) -> f a
-  | (Rel _ | Meta _ | Var _   | Sort _ | Const _ | Ind _ | Construct _) -> ()
-
-(* The comparison used to determine which subterms matches is KEYED        *)
-(* CONVERSION. This looks for convertible terms that either have the same  *)
-(* same head constant as pat if pat is an application (after beta-iota),   *)
-(* or start with the same constr constructor (esp. for LetIn); this is     *)
-(* disregarded if the head term is let x := ... in x, and casts are always *)
-(* ignored and removed).                                                   *)
-(* Record projections get special treatment: in addition to the projection *)
-(* constant itself, ssreflect also recognizes head constants of canonical  *)
-(* projections.                                                            *)
-
-exception NoMatch
-type ssrdir = L2R | R2L
-let pr_dir_side = function L2R -> str "LHS" | R2L -> str "RHS"
-let inv_dir = function L2R -> R2L | R2L -> L2R
-
-
-type pattern_class =
-  | KpatFixed
-  | KpatConst
-  | KpatEvar of Evar.t
-  | KpatLet
-  | KpatLam
-  | KpatRigid
-  | KpatFlex
-  | KpatProj of Constant.t
-
-type tpattern = {
-  up_k : pattern_class;
-  up_FO : constr;
-  up_f : constr;
-  up_a : constr array;
-  up_t : constr;                      (* equation proof term or matched term *)
-  up_dir : ssrdir;                    (* direction of the rule *)
-  up_ok : constr -> evar_map -> bool; (* progress test for rewrite *)
-  }
-
-let all_ok _ _ = true
-
-let proj_nparams c =
-  try 1 + Recordops.find_projection_nparams (ConstRef c) with _ -> 0
-
-let isRigid c = match kind c with
-  | Prod _ | Sort _ | Lambda _ | Case _ | Fix _ | CoFix _ -> true
-  | _ -> false
-
-let hole_var = mkVar (Id.of_string "_")
-let pr_constr_pat c0 =
-  let rec wipe_evar c =
-    if isEvar c then hole_var else map wipe_evar c in
-  let sigma, env = Pfedit.get_current_context () in
-  pr_constr_env env sigma (wipe_evar c0)
-
-(* Turn (new) evars into metas *)
-let evars_for_FO ~hack env sigma0 (ise0:evar_map) c0 =
-  let ise = ref ise0 in
-  let sigma = ref ise0 in
-  let nenv = env_size env + if hack then 1 else 0 in
-  let rec put c = match kind c with
-  | Evar (k, a as ex) ->
-    begin try put (existential_value !sigma ex)
-    with NotInstantiatedEvar ->
-    if Evd.mem sigma0 k then map put c else
-    let evi = Evd.find !sigma k in
-    let dc = List.firstn (max 0 (Array.length a - nenv)) (evar_filtered_context evi) in
-    let abs_dc (d, c) = function
-    | Context.Named.Declaration.LocalDef (x, b, t) ->
-        d, mkNamedLetIn x (put b) (put t) c
-    | Context.Named.Declaration.LocalAssum (x, t) ->
-        mkVar x :: d, mkNamedProd x (put t) c in
-    let a, t =
-      Context.Named.fold_inside abs_dc ~init:([], (put evi.evar_concl)) dc in
-    let m = Evarutil.new_meta () in
-    ise := meta_declare m t !ise;
-    sigma := Evd.define k (applistc (mkMeta m) a) !sigma;
-    put (existential_value !sigma ex)
-    end
-  | _ -> map put c in
-  let c1 = put c0 in !ise, c1
-
-(* Compile a match pattern from a term; t is the term to fill. *)
-(* p_origin can be passed to obtain a better error message     *)
-let mk_tpattern ?p_origin ?(hack=false) env sigma0 (ise, t) ok dir p =
-  let k, f, a =
-    let f, a = Reductionops.whd_betaiota_stack ise (EConstr.of_constr p) in
-    let f = EConstr.Unsafe.to_constr f in
-    let a = List.map EConstr.Unsafe.to_constr a in
-    match kind f with
-    | Const (p,_) ->
-      let np = proj_nparams p in
-      if np = 0 || np > List.length a then KpatConst, f, a else
-      let a1, a2 = List.chop np a in KpatProj p, (applistc f a1), a2
-    | Proj (p,arg) -> KpatProj (Projection.constant p), f, a
-    | Var _ | Ind _ | Construct _ -> KpatFixed, f, a
-    | Evar (k, _) ->
-      if Evd.mem sigma0 k then KpatEvar k, f, a else
-      if a <> [] then KpatFlex, f, a else 
-      (match p_origin with None -> CErrors.user_err Pp.(str "indeterminate pattern")
-      | Some (dir, rule) ->
-	errorstrm (str "indeterminate " ++ pr_dir_side dir
-          ++ str " in " ++ pr_constr_pat rule))
-    | LetIn (_, v, _, b) ->
-      if b <> mkRel 1 then KpatLet, f, a else KpatFlex, v, a
-    | Lambda _ -> KpatLam, f, a
-    | _ -> KpatRigid, f, a in
-  let aa = Array.of_list a in
-  let ise', p' = evars_for_FO ~hack env sigma0 ise (mkApp (f, aa)) in
-  ise',
-  { up_k = k; up_FO = p'; up_f = f; 
-    up_a = aa; up_ok = ok; up_dir = dir; up_t = t}
-
-(* Specialize a pattern after a successful match: assign a precise head *)
-(* kind and arity for Proj and Flex patterns.                           *)
-let ungen_upat lhs (sigma, uc, t) u =
-  let f, a = safeDestApp lhs in
-  let k = match kind f with
-  | Var _ | Ind _ | Construct _ -> KpatFixed
-  | Const _ -> KpatConst
-  | Evar (k, _) -> if is_defined sigma k then raise NoMatch else KpatEvar k
-  | LetIn _ -> KpatLet
-  | Lambda _ -> KpatLam
-  | _ -> KpatRigid in
-  sigma, uc, {u with up_k = k; up_FO = lhs; up_f = f; up_a = a; up_t = t}
-
-let nb_cs_proj_args pc f u =
-  let na k =
-    List.length (snd (lookup_canonical_conversion (ConstRef pc, k))).o_TCOMPS in
-  let nargs_of_proj t = match kind t with
-      | App(_,args) -> Array.length args
-      | Proj _ -> 0 (* if splay_app calls expand_projection, this has to be
-                       the number of arguments including the projected *)
-      | _ -> assert false in
-  try match kind f with
-  | Prod _ -> na Prod_cs
-  | Sort s -> na (Sort_cs (Sorts.family s))
-  | Const (c',_) when Constant.equal c' pc -> nargs_of_proj u.up_f 
-  | Proj (c',_) when Constant.equal (Projection.constant c') pc -> nargs_of_proj u.up_f
-  | Var _ | Ind _ | Construct _ | Const _ -> na (Const_cs (global_of_constr f))
-  | _ -> -1
-  with Not_found -> -1
-
-let isEvar_k k f =
-  match kind f with Evar (k', _) -> k = k' | _ -> false
-
-let nb_args c =
-  match kind c with App (_, a) -> Array.length a | _ -> 0
-
-let mkSubArg i a = if i = Array.length a then a else Array.sub a 0 i
-let mkSubApp f i a = if i = 0 then f else mkApp (f, mkSubArg i a)
-
-let splay_app ise =
-  let rec loop c a = match kind c with
-  | App (f, a') -> loop f (Array.append a' a)
-  | Cast (c', _, _) -> loop c' a
-  | Evar ex ->
-    (try loop (existential_value ise ex) a with _ -> c, a)
-  | _ -> c, a in
-  fun c -> match kind c with
-  | App (f, a) -> loop f a
-  | Cast _ | Evar _ -> loop c [| |]
-  | _ -> c, [| |]
-
-let filter_upat i0 f n u fpats =
-  let na = Array.length u.up_a in
-  if n < na then fpats else
-  let np = match u.up_k with
-  | KpatConst when eq_constr_nounivs u.up_f f -> na
-  | KpatFixed when eq_constr_nounivs u.up_f f -> na
-  | KpatEvar k when isEvar_k k f -> na
-  | KpatLet when isLetIn f -> na
-  | KpatLam when isLambda f -> na
-  | KpatRigid when isRigid f -> na
-  | KpatFlex -> na
-  | KpatProj pc ->
-    let np = na + nb_cs_proj_args pc f u in if n < np then -1 else np
-  | _ -> -1 in
-  if np < na then fpats else
-  let () = if !i0 < np then i0 := n in (u, np) :: fpats
-
-let eq_prim_proj c t = match kind t with
-  | Proj(p,_) -> Constant.equal (Projection.constant p) c
-  | _ -> false
-
-let filter_upat_FO i0 f n u fpats =
-  let np = nb_args u.up_FO in
-  if n < np then fpats else
-  let ok = match u.up_k with
-  | KpatConst -> eq_constr_nounivs u.up_f f
-  | KpatFixed -> eq_constr_nounivs u.up_f f
-  | KpatEvar k -> isEvar_k k f
-  | KpatLet -> isLetIn f
-  | KpatLam -> isLambda f
-  | KpatRigid -> isRigid f
-  | KpatProj pc -> equal f (mkConst pc) || eq_prim_proj pc f
-  | KpatFlex -> i0 := n; true in
-  if ok then begin if !i0 < np then i0 := np; (u, np) :: fpats end else fpats
-
-exception FoundUnif of (evar_map * UState.t * tpattern)
-(* Note: we don't update env as we descend into the term, as the primitive *)
-(* unification procedure always rejects subterms with bound variables.     *)
-
-let dont_impact_evars_in cl =
-  let evs_in_cl = Evd.evars_of_term cl in
-  fun sigma -> Evar.Set.for_all (fun k ->
-    try let _ = Evd.find_undefined sigma k in true
-    with Not_found -> false) evs_in_cl
-
-(* We are forced to duplicate code between the FO/HO matching because we    *)
-(* have to work around several kludges in unify.ml:                         *)
-(*  - w_unify drops into second-order unification when the pattern is an    *)
-(*    application whose head is a meta.                                     *)
-(*  - w_unify tries to unify types without subsumption when the pattern     *)
-(*    head is an evar or meta (e.g., it fails on ?1 = nat when ?1 : Type).  *)
-(*  - w_unify expands let-in (zeta conversion) eagerly, whereas we want to  *)
-(*    match a head let rigidly.                                             *)
-let match_upats_FO upats env sigma0 ise orig_c =
-  let dont_impact_evars = dont_impact_evars_in orig_c in
-  let rec loop c =
-    let f, a = splay_app ise c in let i0 = ref (-1) in
-    let fpats =
-      List.fold_right (filter_upat_FO i0 f (Array.length a)) upats [] in
-    while !i0 >= 0 do
-      let i = !i0 in i0 := -1;
-      let c' = mkSubApp f i a in
-      let one_match (u, np) =
-         let skip =
-           if i <= np then i < np else
-           if u.up_k == KpatFlex then begin i0 := i - 1; false end else
-           begin if !i0 < np then i0 := np; true end in
-         if skip || not (closed0 c') then () else try
-           let _ = match u.up_k with
-           | KpatFlex ->
-             let kludge v = mkLambda (Anonymous, mkProp, v) in
-             unif_FO env ise (kludge u.up_FO) (kludge c')
-           | KpatLet ->
-             let kludge vla =
-               let vl, a = safeDestApp vla in
-               let x, v, t, b = destLetIn vl in
-               mkApp (mkLambda (x, t, b), Array.cons v a) in
-             unif_FO env ise (kludge u.up_FO) (kludge c')
-           | _ -> unif_FO env ise u.up_FO c' in
-           let ise' = (* Unify again using HO to assign evars *)
-             let p = mkApp (u.up_f, u.up_a) in
-             try unif_HO env ise (EConstr.of_constr p) (EConstr.of_constr c') with e when CErrors.noncritical e -> raise NoMatch in
-           let lhs = mkSubApp f i a in
-           let pt' = unif_end env sigma0 ise' (EConstr.of_constr u.up_t) (u.up_ok lhs) in
-           let pt' = pi1 pt', pi2 pt', EConstr.Unsafe.to_constr (pi3 pt') in
-           raise (FoundUnif (ungen_upat lhs pt' u))
-       with FoundUnif (s,_,_) as sig_u when dont_impact_evars s -> raise sig_u
-       | Not_found -> CErrors.anomaly (str"incomplete ise in match_upats_FO.")
-       | e when CErrors.noncritical e -> () in
-    List.iter one_match fpats
-  done;
-  iter_constr_LR loop f; Array.iter loop a in
-  try loop orig_c with Invalid_argument _ -> CErrors.anomaly (str"IN FO.")
-
-let prof_FO = mk_profiler "match_upats_FO";;
-let match_upats_FO upats env sigma0 ise c =
-  prof_FO.profile (match_upats_FO upats env sigma0) ise c
-;;
-
-
-let match_upats_HO ~on_instance upats env sigma0 ise c =
- let dont_impact_evars = dont_impact_evars_in c in
- let it_did_match = ref false in
- let failed_because_of_TC = ref false in
- let rec aux upats env sigma0 ise c =
-  let f, a = splay_app ise c in let i0 = ref (-1) in
-  let fpats = List.fold_right (filter_upat i0 f (Array.length a)) upats [] in
-  while !i0 >= 0 do
-    let i = !i0 in i0 := -1;
-    let one_match (u, np) =
-      let skip =
-        if i <= np then i < np else
-        if u.up_k == KpatFlex then begin i0 := i - 1; false end else
-        begin if !i0 < np then i0 := np; true end in
-      if skip then () else try
-        let ise' = match u.up_k with
-        | KpatFixed | KpatConst -> ise
-        | KpatEvar _ ->
-          let _, pka = destEvar u.up_f and _, ka = destEvar f in
-          unif_HO_args env ise pka 0 ka
-        | KpatLet ->
-          let x, v, t, b = destLetIn f in
-          let _, pv, _, pb = destLetIn u.up_f in
-          let ise' = unif_HO env ise (EConstr.of_constr pv) (EConstr.of_constr v) in
-          unif_HO
-            (Environ.push_rel (Context.Rel.Declaration.LocalAssum(x, t)) env)
-            ise' (EConstr.of_constr pb) (EConstr.of_constr b)
-        | KpatFlex | KpatProj _ ->
-          unif_HO env ise (EConstr.of_constr u.up_f) (EConstr.of_constr(mkSubApp f (i - Array.length u.up_a) a))
-        | _ -> unif_HO env ise (EConstr.of_constr u.up_f) (EConstr.of_constr f) in
-        let ise'' = unif_HO_args env ise' u.up_a (i - Array.length u.up_a) a in
-        let lhs = mkSubApp f i a in
-        let pt' = unif_end env sigma0 ise'' (EConstr.of_constr u.up_t) (u.up_ok lhs) in
-        let pt' = pi1 pt', pi2 pt', EConstr.Unsafe.to_constr (pi3 pt') in
-        on_instance (ungen_upat lhs pt' u)
-      with FoundUnif (s,_,_) as sig_u when dont_impact_evars s -> raise sig_u
-      | NoProgress -> it_did_match := true
-      | Pretype_errors.PretypeError
-         (_,_,Pretype_errors.UnsatisfiableConstraints _) ->
-          failed_because_of_TC:=true
-      | e when CErrors.noncritical e -> () in
-    List.iter one_match fpats
-  done;
-  iter_constr_LR (aux upats env sigma0 ise) f;
-  Array.iter (aux upats env sigma0 ise) a
- in
- aux upats env sigma0 ise c;
- if !it_did_match then raise NoProgress;
- !failed_because_of_TC
-
-let prof_HO = mk_profiler "match_upats_HO";;
-let match_upats_HO ~on_instance upats env sigma0 ise c =
-  prof_HO.profile (match_upats_HO ~on_instance upats env sigma0) ise c
-;;
-
-
-let fixed_upat = function
-| {up_k = KpatFlex | KpatEvar _ | KpatProj _} -> false 
-| {up_t = t} -> not (occur_existential Evd.empty (EConstr.of_constr t)) (** FIXME *)
-
-let do_once r f = match !r with Some _ -> () | None -> r := Some (f ())
-
-let assert_done r = 
-  match !r with Some x -> x | None -> CErrors.anomaly (str"do_once never called.")
-
-let assert_done_multires r = 
-  match !r with
-  | None -> CErrors.anomaly (str"do_once never called.")
-  | Some (n, xs) ->
-      r := Some (n+1,xs);
-      try List.nth xs n with Failure _ -> raise NoMatch
-
-type subst = Environ.env -> constr -> constr -> int -> constr
-type find_P = 
-  Environ.env -> constr -> int ->
-  k:subst ->
-     constr
-type conclude = unit ->
-  constr * ssrdir * (Evd.evar_map * UState.t * constr)
-
-(* upats_origin makes a better error message only            *)
-let mk_tpattern_matcher ?(all_instances=false)
-  ?(raise_NoMatch=false) ?upats_origin sigma0 occ (ise, upats)
-=
-  let nocc = ref 0 and skip_occ = ref false in
-  let use_occ, occ_list = match occ with
-  | Some (true, ol) -> ol = [], ol
-  | Some (false, ol) -> ol <> [], ol
-  | None -> false, [] in
-  let max_occ = List.fold_right max occ_list 0 in
-  let subst_occ =
-    let occ_set = Array.make max_occ (not use_occ) in
-    let _ = List.iter (fun i -> occ_set.(i - 1) <- use_occ) occ_list in
-    let _ = if max_occ = 0 then skip_occ := use_occ in
-    fun () -> incr nocc;
-    if !nocc = max_occ then skip_occ := use_occ;
-    if !nocc <= max_occ then occ_set.(!nocc - 1) else not use_occ in
-  let upat_that_matched = ref None in
-  let match_EQ env sigma u = 
-    match u.up_k with
-    | KpatLet ->
-      let x, pv, t, pb = destLetIn u.up_f in
-      let env' =
-        Environ.push_rel (Context.Rel.Declaration.LocalAssum(x, t)) env in
-      let match_let f = match kind f with
-      | LetIn (_, v, _, b) -> unif_EQ env sigma pv v && unif_EQ env' sigma pb b
-      | _ -> false in match_let
-    | KpatFixed -> eq_constr_nounivs u.up_f
-    | KpatConst -> eq_constr_nounivs u.up_f
-    | KpatLam -> fun c ->
-       (match kind c with
-       | Lambda _ -> unif_EQ env sigma u.up_f c
-       | _ -> false)
-    | _ -> unif_EQ env sigma u.up_f in
-let p2t p = mkApp(p.up_f,p.up_a) in 
-let source () = match upats_origin, upats with
-  | None, [p] -> 
-      (if fixed_upat p then str"term " else str"partial term ") ++ 
-      pr_constr_pat (p2t p) ++ spc()
-  | Some (dir,rule), [p] -> str"The " ++ pr_dir_side dir ++ str" of " ++ 
-      pr_constr_pat rule ++ fnl() ++ ws 4 ++ pr_constr_pat (p2t p) ++ fnl()
-  | Some (dir,rule), _ -> str"The " ++ pr_dir_side dir ++ str" of " ++ 
-      pr_constr_pat rule ++ spc()
-  | _, [] | None, _::_::_ ->
-      CErrors.anomaly (str"mk_tpattern_matcher with no upats_origin.") in
-let on_instance, instances =
-  let instances = ref [] in
-  (fun x ->
-    if all_instances then instances := !instances @ [x]
-    else raise (FoundUnif x)),
-  (fun () -> !instances) in
-let rec uniquize = function
-  | [] -> []
-  | (sigma,_,{ up_f = f; up_a = a; up_t = t } as x) :: xs ->
-    let t = nf_evar sigma t in
-    let f = nf_evar sigma f in
-    let a = Array.map (nf_evar sigma) a in
-    let neq (sigma1,_,{ up_f = f1; up_a = a1; up_t = t1 }) =
-      let t1 = nf_evar sigma1 t1 in
-      let f1 = nf_evar sigma1 f1 in
-      let a1 = Array.map (nf_evar sigma1) a1 in
-      not (equal t t1 &&
-           equal f f1 && CArray.for_all2 equal a a1) in
-    x :: uniquize (List.filter neq xs) in
-
-((fun env c h ~k -> 
-  do_once upat_that_matched (fun () -> 
-    let failed_because_of_TC = ref false in
-    try
-      if not all_instances then match_upats_FO upats env sigma0 ise c;
-      failed_because_of_TC:=match_upats_HO ~on_instance upats env sigma0 ise c;
-      raise NoMatch
-    with FoundUnif sigma_u -> 0,[sigma_u]
-    | (NoMatch|NoProgress) when all_instances && instances () <> [] ->
-      0, uniquize (instances ())
-    | NoMatch when (not raise_NoMatch) ->
-      if !failed_because_of_TC then
-        errorstrm (source ()++strbrk"matches but type classes inference fails")
-      else
-        errorstrm (source () ++ str "does not match any subterm of the goal")
-    | NoProgress when (not raise_NoMatch) ->
-        let dir = match upats_origin with Some (d,_) -> d | _ ->
-          CErrors.anomaly (str"mk_tpattern_matcher with no upats_origin.") in
-        errorstrm (str"all matches of "++source()++
-          str"are equal to the " ++ pr_dir_side (inv_dir dir))
-    | NoProgress -> raise NoMatch);
-  let sigma, _, ({up_f = pf; up_a = pa} as u) =
-    if all_instances then assert_done_multires upat_that_matched
-    else List.hd (snd(assert_done upat_that_matched)) in
-(*   pp(lazy(str"sigma@tmatch=" ++ pr_evar_map None sigma)); *)
-  if !skip_occ then ((*ignore(k env u.up_t 0);*) c) else
-  let match_EQ = match_EQ env sigma u in
-  let pn = Array.length pa in
-  let rec subst_loop (env,h as acc) c' =
-    if !skip_occ then c' else
-    let f, a = splay_app sigma c' in
-    if Array.length a >= pn && match_EQ f && unif_EQ_args env sigma pa a then
-      let a1, a2 = Array.chop (Array.length pa) a in
-      let fa1 = mkApp (f, a1) in
-      let f' = if subst_occ () then k env u.up_t fa1 h else fa1 in
-      mkApp (f', Array.map_left (subst_loop acc) a2)
-    else
-      (* TASSI: clear letin values to avoid unfolding *)
-      let inc_h rd (env,h') =
-        let ctx_item =
-          match rd with
-          | Context.Rel.Declaration.LocalAssum _ as x -> x
-          | Context.Rel.Declaration.LocalDef (x,_,y) ->
-              Context.Rel.Declaration.LocalAssum(x,y) in
-        EConstr.push_rel ctx_item env, h' + 1 in
-      let self acc c = EConstr.of_constr (subst_loop acc (EConstr.Unsafe.to_constr c)) in
-      let f = EConstr.of_constr f in
-      let f' = map_constr_with_binders_left_to_right sigma inc_h self acc f in
-      let f' = EConstr.Unsafe.to_constr f' in
-      mkApp (f', Array.map_left (subst_loop acc) a) in
-  subst_loop (env,h) c) : find_P),
-((fun () ->
-  let sigma, uc, ({up_f = pf; up_a = pa} as u) =
-    match !upat_that_matched with
-    | Some (_,x) -> List.hd x | None when raise_NoMatch -> raise NoMatch
-    | None -> CErrors.anomaly (str"companion function never called.") in
-  let p' = mkApp (pf, pa) in
-  if max_occ <= !nocc then p', u.up_dir, (sigma, uc, u.up_t)
-  else errorstrm (str"Only " ++ int !nocc ++ str" < " ++ int max_occ ++
-        str(String.plural !nocc " occurence") ++ match upats_origin with
-        | None -> str" of" ++ spc() ++ pr_constr_pat p'
-        | Some (dir,rule) -> str" of the " ++ pr_dir_side dir ++ fnl() ++
-            ws 4 ++ pr_constr_pat p' ++ fnl () ++ 
-            str"of " ++ pr_constr_pat rule)) : conclude)
-
-type ('ident, 'term) ssrpattern = 
-  | T of 'term
-  | In_T of 'term
-  | X_In_T of 'ident * 'term     
-  | In_X_In_T of 'ident * 'term     
-  | E_In_X_In_T of 'term * 'ident * 'term     
-  | E_As_X_In_T of 'term * 'ident * 'term     
-        
-let pr_pattern = function
-  | T t -> prl_term t
-  | In_T t -> str "in " ++ prl_term t
-  | X_In_T (x,t) -> prl_term x ++ str " in " ++ prl_term t
-  | In_X_In_T (x,t) -> str "in " ++ prl_term x ++ str " in " ++ prl_term t
-  | E_In_X_In_T (e,x,t) ->
-      prl_term e ++ str " in " ++ prl_term x ++ str " in " ++ prl_term t
-  | E_As_X_In_T (e,x,t) ->
-      prl_term e ++ str " as " ++ prl_term x ++ str " in " ++ prl_term t
-
-let pr_pattern_w_ids = function
-  | T t -> prl_term t
-  | In_T t -> str "in " ++ prl_term t
-  | X_In_T (x,t) -> pr_id x ++ str " in " ++ prl_term t
-  | In_X_In_T (x,t) -> str "in " ++ pr_id x ++ str " in " ++ prl_term t
-  | E_In_X_In_T (e,x,t) ->
-      prl_term e ++ str " in " ++ pr_id x ++ str " in " ++ prl_term t
-  | E_As_X_In_T (e,x,t) ->
-      prl_term e ++ str " as " ++ pr_id x ++ str " in " ++ prl_term t
-
-let pr_pattern_aux pr_constr = function
-  | T t -> pr_constr t
-  | In_T t -> str "in " ++ pr_constr t
-  | X_In_T (x,t) -> pr_constr x ++ str " in " ++ pr_constr t
-  | In_X_In_T (x,t) -> str "in " ++ pr_constr x ++ str " in " ++ pr_constr t
-  | E_In_X_In_T (e,x,t) ->
-      pr_constr e ++ str " in " ++ pr_constr x ++ str " in " ++ pr_constr t
-  | E_As_X_In_T (e,x,t) ->
-      pr_constr e ++ str " as " ++ pr_constr x ++ str " in " ++ pr_constr t
-let pp_pattern (sigma, p) =
-  pr_pattern_aux (fun t -> pr_constr_pat (EConstr.Unsafe.to_constr (pi3 (nf_open_term sigma sigma (EConstr.of_constr t))))) p
-let pr_cpattern = pr_term
-let pr_rpattern _ _ _ = pr_pattern
-
-let wit_rpatternty = add_genarg "rpatternty" pr_pattern
-
-let glob_ssrterm gs = function
-  | k, (_, Some c), None ->
-      let x = Tacintern.intern_constr gs c in
-      k, (fst x, Some c), None
-  | ct -> ct
-
-(* This piece of code asserts the following notations are reserved *)
-(* Reserved Notation "( a 'in' b )"        (at level 0).           *)
-(* Reserved Notation "( a 'as' b )"        (at level 0).           *)
-(* Reserved Notation "( a 'in' b 'in' c )" (at level 0).           *)
-(* Reserved Notation "( a 'as' b 'in' c )" (at level 0).           *)
-let glob_cpattern gs p =
-  pp(lazy(str"globbing pattern: " ++ pr_term p));
-  let glob x = pi2 (glob_ssrterm gs (mk_lterm x None)) in
-  let encode k s l =
-    let name = Name (Id.of_string ("_ssrpat_" ^ s)) in
-    k, (mkRCast mkRHole (mkRLambda name mkRHole (mkRApp mkRHole l)), None), None in
-  let bind_in t1 t2 =
-    let mkCHole = mkCHole ~loc:None in let n = Name (destCVar t1) in
-    fst (glob (mkCCast mkCHole (mkCLambda n mkCHole t2))) in
-  let check_var t2 = if not (isCVar t2) then
-    loc_error (constr_loc t2) "Only identifiers are allowed here" in
-  match p with
-  | _, (_, None), _ as x -> x
-  | k, (v, Some t), _ as orig ->
-     if k = 'x' then glob_ssrterm gs ('(', (v, Some t), None) else
-     match t.CAst.v with
-     | CNotation("( _ in _ )", ([t1; t2], [], [], [])) ->
-         (try match glob t1, glob t2 with
-         | (r1, None), (r2, None) -> encode k "In" [r1;r2]
-         | (r1, Some _), (r2, Some _) when isCVar t1 ->
-             encode k "In" [r1; r2; bind_in t1 t2]
-         | (r1, Some _), (r2, Some _) -> encode k "In" [r1; r2]
-         | _ -> CErrors.anomaly (str"where are we?.")
-         with _ when isCVar t1 -> encode k "In" [bind_in t1 t2])
-     | CNotation("( _ in _ in _ )", ([t1; t2; t3], [], [], [])) ->
-         check_var t2; encode k "In" [fst (glob t1); bind_in t2 t3]
-     | CNotation("( _ as _ )", ([t1; t2], [], [], [])) ->
-         encode k "As" [fst (glob t1); fst (glob t2)]
-     | CNotation("( _ as _ in _ )", ([t1; t2; t3], [], [], [])) ->
-         check_var t2; encode k "As" [fst (glob t1); bind_in t2 t3]
-     | _ -> glob_ssrterm gs orig
-;;
-
-let glob_rpattern s p =
-  match p with
-  | T t -> T (glob_cpattern s t)
-  | In_T t -> In_T (glob_ssrterm s t)
-  | X_In_T(x,t) -> X_In_T (x,glob_ssrterm s t)
-  | In_X_In_T(x,t) -> In_X_In_T (x,glob_ssrterm s t)
-  | E_In_X_In_T(e,x,t) -> E_In_X_In_T (glob_ssrterm s e,x,glob_ssrterm s t)
-  | E_As_X_In_T(e,x,t) -> E_As_X_In_T (glob_ssrterm s e,x,glob_ssrterm s t)
-
-let subst_ssrterm s (k, c, ist) =
-  k, Tacsubst.subst_glob_constr_and_expr s c, ist
-
-let subst_rpattern s = function
-  | T t -> T (subst_ssrterm s t)
-  | In_T t -> In_T (subst_ssrterm s t)
-  | X_In_T(x,t) -> X_In_T (x,subst_ssrterm s t)
-  | In_X_In_T(x,t) -> In_X_In_T (x,subst_ssrterm s t)
-  | E_In_X_In_T(e,x,t) -> E_In_X_In_T (subst_ssrterm s e,x,subst_ssrterm s t)
-  | E_As_X_In_T(e,x,t) -> E_As_X_In_T (subst_ssrterm s e,x,subst_ssrterm s t)
-
-let interp_ssrterm ist (k,t,_) = k, t, Some ist
-
-let interp_rpattern s = function
-  | T t -> T (interp_ssrterm s t)
-  | In_T t -> In_T (interp_ssrterm s t)
-  | X_In_T(x,t) -> X_In_T (interp_ssrterm s x,interp_ssrterm s t)
-  | In_X_In_T(x,t) -> In_X_In_T (interp_ssrterm s x,interp_ssrterm s t)
-  | E_In_X_In_T(e,x,t) ->
-      E_In_X_In_T (interp_ssrterm s e,interp_ssrterm s x,interp_ssrterm s t)
-  | E_As_X_In_T(e,x,t) ->
-      E_As_X_In_T (interp_ssrterm s e,interp_ssrterm s x,interp_ssrterm s t)
-
-let interp_rpattern ist gl t = Tacmach.project gl, interp_rpattern ist t
-
-ARGUMENT EXTEND rpattern
-  TYPED AS rpatternty
-  PRINTED BY pr_rpattern
-  INTERPRETED BY interp_rpattern
-  GLOBALIZED BY glob_rpattern
-  SUBSTITUTED BY subst_rpattern
-  | [ lconstr(c) ] -> [ T (mk_lterm c None) ]
-  | [ "in" lconstr(c) ] -> [ In_T (mk_lterm c None) ]
-  | [ lconstr(x) "in" lconstr(c) ] -> 
-    [ X_In_T (mk_lterm x None, mk_lterm c None) ]
-  | [ "in" lconstr(x) "in" lconstr(c) ] -> 
-    [ In_X_In_T (mk_lterm x None, mk_lterm c None) ]
-  | [ lconstr(e) "in" lconstr(x) "in" lconstr(c) ] -> 
-    [ E_In_X_In_T (mk_lterm e None, mk_lterm x None, mk_lterm c None) ]
-  | [ lconstr(e) "as" lconstr(x) "in" lconstr(c) ] -> 
-    [ E_As_X_In_T (mk_lterm e None, mk_lterm x None, mk_lterm c None) ]
-END
-
-
-
-type cpattern = char * glob_constr_and_expr * Geninterp.interp_sign option
-let tag_of_cpattern = pi1
-let loc_of_cpattern = loc_ofCG
-let cpattern_of_term (c, t) ist = c, t, Some ist
-type occ = (bool * int list) option
-
-type rpattern = (cpattern, cpattern) ssrpattern
-
-type pattern = Evd.evar_map * (constr, constr) ssrpattern
-
-let id_of_cpattern (_, (c1, c2), _) =
-  let open CAst in
-  match DAst.get c1, c2 with
-  | _, Some { v = CRef ({CAst.v=Ident x}, _) } -> Some x
-  | _, Some { v = CAppExpl ((_, {CAst.v=Ident x}, _), []) } -> Some x
-  | GRef (VarRef x, _), None -> Some x
-  | _ -> None
-let id_of_Cterm t = match id_of_cpattern t with
-  | Some x -> x
-  | None -> loc_error (loc_of_cpattern t) "Only identifiers are allowed here"
-
-let of_ftactic ftac gl =
-  let r = ref None in
-  let tac = Ftactic.run ftac (fun ans -> r := Some ans; Proofview.tclUNIT ()) in
-  let tac = Proofview.V82.of_tactic tac in
-  let { sigma = sigma } = tac gl in
-  let ans = match !r with
-  | None -> assert false (** If the tactic failed we should not reach this point *)
-  | Some ans -> ans
-  in
-  (sigma, ans)
-
-let interp_wit wit ist gl x = 
-  let globarg = in_gen (glbwit wit) x in
-  let arg = interp_genarg ist globarg in
-  let (sigma, arg) = of_ftactic arg gl in
-  sigma, Value.cast (topwit wit) arg
-let interp_open_constr ist gl gc =
-  interp_wit wit_open_constr ist gl gc
-let pf_intern_term gl (_, c, ist) = glob_constr ist (pf_env gl) (project gl) c
-let pr_ssrterm _ _ _ = pr_term
-let input_ssrtermkind strm = match stream_nth 0 strm with
-  | Tok.KEYWORD "(" -> '('
-  | Tok.KEYWORD "@" -> '@'
-  | _ -> ' '
-let ssrtermkind = Pcoq.Gram.Entry.of_parser "ssrtermkind" input_ssrtermkind
-
-let interp_ssrterm ist gl t = Tacmach.project gl, interp_ssrterm ist t
-
-ARGUMENT EXTEND cpattern
-     PRINTED BY pr_ssrterm
-     INTERPRETED BY interp_ssrterm
-     GLOBALIZED BY glob_cpattern SUBSTITUTED BY subst_ssrterm
-     RAW_PRINTED BY pr_ssrterm
-     GLOB_PRINTED BY pr_ssrterm
-| [ "Qed" constr(c) ] -> [ mk_lterm c None ]
-END
-
-GEXTEND Gram
-  GLOBAL: cpattern;
-  cpattern: [[ k = ssrtermkind; c = constr ->
-    let pattern = mk_term k c None in
-    if loc_ofCG pattern <> Some !@loc && k = '('
-    then mk_term 'x' c None
-    else pattern ]];
-END
-
-ARGUMENT EXTEND lcpattern
-     TYPED AS cpattern
-     PRINTED BY pr_ssrterm
-     INTERPRETED BY interp_ssrterm
-     GLOBALIZED BY glob_cpattern SUBSTITUTED BY subst_ssrterm
-     RAW_PRINTED BY pr_ssrterm
-     GLOB_PRINTED BY pr_ssrterm
-| [ "Qed" lconstr(c) ] -> [ mk_lterm c None ]
-END
-
-GEXTEND Gram
-  GLOBAL: lcpattern;
-  lcpattern: [[ k = ssrtermkind; c = lconstr ->
-    let pattern = mk_term k c None in
-    if loc_ofCG pattern <> Some !@loc && k = '('
-    then mk_term 'x' c None
-    else pattern ]];
-END
-
-let interp_term gl = function
-  | (_, c, Some ist) ->
-      on_snd EConstr.Unsafe.to_constr (interp_open_constr ist gl c)
-  | _ -> errorstrm (str"interpreting a term with no ist")
-
-let thin id sigma goal =
-  let ids = Id.Set.singleton id in
-  let env = Goal.V82.env sigma goal in
-  let cl = Goal.V82.concl sigma goal in
-  let evdref = ref (Evd.clear_metas sigma) in
-  let ans =
-    try Some (Evarutil.clear_hyps_in_evi env evdref (Environ.named_context_val env) cl ids)
-    with Evarutil.ClearDependencyError _ -> None
-  in
-  match ans with
-  | None -> sigma
-  | Some (hyps, concl) ->
-    let sigma = !evdref in
-    let (gl,ev,sigma) = Goal.V82.mk_goal sigma hyps concl (Goal.V82.extra sigma goal) in
-    let sigma = Goal.V82.partial_solution_to sigma goal gl ev in
-    sigma
-
-(*
-let pr_ist { lfun= lfun } =
-  prlist_with_sep spc
-    (fun (id, Geninterp.Val.Dyn(ty,_)) ->
-        pr_id id ++ str":" ++ Geninterp.Val.pr ty) (Id.Map.bindings lfun)
-*)
-
-let interp_pattern ?wit_ssrpatternarg gl red redty =
-  pp(lazy(str"interpreting: " ++ pr_pattern red));
-  let xInT x y = X_In_T(x,y) and inXInT x y = In_X_In_T(x,y) in
-  let inT x = In_T x and eInXInT e x t = E_In_X_In_T(e,x,t) in
-  let eAsXInT e x t = E_As_X_In_T(e,x,t) in
-  let mkG ?(k=' ') x ist = k,(x,None), ist in
-  let ist_of (_,_,ist) = ist in
-  let decode (_,_,ist as t) ?reccall f g =
-    try match DAst.get (pf_intern_term gl t) with
-    | GCast(t,CastConv c) when isGHole t && isGLambda c->
-      let (x, c) = destGLambda c in
-      f x (' ',(c,None),ist)
-    | GVar id
-      when Option.has_some ist && let ist = Option.get ist in
-           Id.Map.mem id ist.lfun &&
-           not(Option.is_empty reccall) &&
-           not(Option.is_empty wit_ssrpatternarg) ->
-        let v = Id.Map.find id (Option.get ist).lfun in
-        Option.get reccall
-          (Value.cast (topwit (Option.get wit_ssrpatternarg)) v)
-    | it -> g t with e when CErrors.noncritical e -> g t in
-  let decodeG ist t f g = decode (mkG t ist) f g in
-  let bad_enc id _ = CErrors.anomaly (str"bad encoding for pattern "++str id++str".") in
-  let cleanup_XinE h x rp sigma =
-    let h_k = match kind h with Evar (k,_) -> k | _ -> assert false in
-    let to_clean, update = (* handle rename if x is already used *)
-      let ctx = pf_hyps gl in
-      let len = Context.Named.length ctx in
-      let name = ref None in
-      try ignore(Context.Named.lookup x ctx); (name, fun k ->
-        if !name = None then
-        let nctx = Evd.evar_context (Evd.find sigma k) in
-        let nlen = Context.Named.length nctx in
-        if nlen > len then begin
-          name := Some (Context.Named.Declaration.get_id (List.nth nctx (nlen - len - 1)))
-        end)
-      with Not_found -> ref (Some x), fun _ -> () in
-    let sigma0 = project gl in
-    let new_evars =
-      let rec aux acc t = match kind t with
-      | Evar (k,_) ->
-          if k = h_k || List.mem k acc || Evd.mem sigma0 k then acc else
-          (update k; k::acc)
-      | _ -> CoqConstr.fold aux acc t in 
-      aux [] (nf_evar sigma rp) in
-    let sigma = 
-      List.fold_left (fun sigma e ->
-        if Evd.is_defined sigma e then sigma else (* clear may be recursive *)
-        if Option.is_empty !to_clean then sigma else
-        let name = Option.get !to_clean in
-        pp(lazy(pr_id name));
-        thin name sigma e)
-      sigma new_evars in
-    sigma in
-  let red = let rec decode_red = function
-    | T(k,(t,None),ist) ->
-      begin match DAst.get t with
-      | GCast (c,CastConv t)
-        when isGHole c &&
-          let (id, t) = destGLambda t in
-          let id = Id.to_string id in let len = String.length id in
-        (len > 8 && String.sub id 0 8 = "_ssrpat_") ->
-        let (id, t) = destGLambda t in
-        let id = Id.to_string id in let len = String.length id in
-        (match String.sub id 8 (len - 8), DAst.get t with
-        | "In", GApp( _, [t]) -> decodeG ist t xInT (fun x -> T x)
-        | "In", GApp( _, [e; t]) -> decodeG ist t (eInXInT (mkG e ist)) (bad_enc id)
-        | "In", GApp( _, [e; t; e_in_t]) ->
-            decodeG ist t (eInXInT (mkG e ist))
-              (fun _ -> decodeG ist e_in_t xInT (fun _ -> assert false))
-        | "As", GApp(_, [e; t]) -> decodeG ist t (eAsXInT (mkG e ist)) (bad_enc id)
-        | _ -> bad_enc id ())
-      | _ ->
-        decode ~reccall:decode_red (mkG ~k t ist) xInT (fun x -> T x)
-      end
-    | T t -> decode ~reccall:decode_red t xInT (fun x -> T x)
-    | In_T t -> decode t inXInT inT
-    | X_In_T (e,t) ->  decode t (eInXInT e) (fun x -> xInT (id_of_Cterm e) x)
-    | In_X_In_T (e,t) -> inXInT (id_of_Cterm e) t
-    | E_In_X_In_T (e,x,rp) -> eInXInT e (id_of_Cterm x) rp
-    | E_As_X_In_T (e,x,rp) -> eAsXInT e (id_of_Cterm x) rp in
-    decode_red red in
-  pp(lazy(str"decoded as: " ++ pr_pattern_w_ids red));
-  let red =
-    match redty with
-    | None -> red
-    | Some (ty, ist) -> let ty = ' ', ty, Some ist in
-  match red with
-  | T t -> T (combineCG t ty (mkCCast ?loc:(loc_ofCG t)) mkRCast)
-  | X_In_T (x,t) ->
-      let gty = pf_intern_term gl ty in
-      E_As_X_In_T (mkG (mkRCast mkRHole gty) (ist_of ty), x, t)
-  | E_In_X_In_T (e,x,t) ->
-      let ty = mkG (pf_intern_term gl ty) (ist_of ty) in
-      E_In_X_In_T (combineCG e ty (mkCCast ?loc:(loc_ofCG t)) mkRCast, x, t)
-  | E_As_X_In_T (e,x,t) ->
-      let ty = mkG (pf_intern_term gl ty) (ist_of ty) in
-      E_As_X_In_T (combineCG e ty (mkCCast ?loc:(loc_ofCG t)) mkRCast, x, t)
-  | red -> red in
-  pp(lazy(str"typed as: " ++ pr_pattern_w_ids red));
-  let mkXLetIn ?loc x (a,(g,c),ist) = match c with
-  | Some b -> a,(g,Some (mkCLetIn ?loc x (mkCHole ~loc) b)), ist
-  | None -> a,(DAst.make ?loc @@ GLetIn (x, DAst.make ?loc @@ GHole (BinderType x, IntroAnonymous, None), None, g), None), ist in
-  match red with
-  | T t -> let sigma, t = interp_term gl t in sigma, T t
-  | In_T t -> let sigma, t = interp_term gl t in sigma, In_T t
-  | X_In_T (x, rp) | In_X_In_T (x, rp) ->
-    let mk x p = match red with X_In_T _ -> X_In_T(x,p) | _ -> In_X_In_T(x,p) in
-    let rp = mkXLetIn (Name x) rp in
-    let sigma, rp = interp_term gl rp in
-    let _, h, _, rp = destLetIn rp in
-    let sigma = cleanup_XinE h x rp sigma in
-    let rp = subst1 h (nf_evar sigma rp) in
-    sigma, mk h rp
-  | E_In_X_In_T(e, x, rp) | E_As_X_In_T (e, x, rp) ->
-    let mk e x p =
-      match red with E_In_X_In_T _ ->E_In_X_In_T(e,x,p)|_->E_As_X_In_T(e,x,p) in
-    let rp = mkXLetIn (Name x) rp in
-    let sigma, rp = interp_term gl rp in
-    let _, h, _, rp = destLetIn rp in
-    let sigma = cleanup_XinE h x rp sigma in
-    let rp = subst1 h (nf_evar sigma rp) in
-    let sigma, e = interp_term (re_sig (sig_it gl) sigma) e in
-    sigma, mk e h rp
-;;
-let interp_cpattern gl red redty = interp_pattern gl (T red) redty;;
-let interp_rpattern ~wit_ssrpatternarg gl red = interp_pattern ~wit_ssrpatternarg gl red None;;
-
-let id_of_pattern = function
-  | _, T t -> (match kind t with Var id -> Some id | _ -> None)
-  | _ -> None
-
-(* The full occurrence set *)
-let noindex = Some(false,[])
-
-(* calls do_subst on every sub-term identified by (pattern,occ) *)
-let eval_pattern ?raise_NoMatch env0 sigma0 concl0 pattern occ do_subst =
-  let fs sigma x = nf_evar sigma x in
-  let pop_evar sigma e p =
-    let { Evd.evar_body = e_body } as e_def = Evd.find sigma e in
-    let e_body = match e_body with Evar_defined c -> c
-    | _ -> errorstrm (str "Matching the pattern " ++ pr_constr_env env0 sigma0 p ++
-          str " did not instantiate ?" ++ int (Evar.repr e) ++ spc () ++
-          str "Does the variable bound by the \"in\" construct occur "++
-          str "in the pattern?") in
-    let sigma = 
-      Evd.add (Evd.remove sigma e) e {e_def with Evd.evar_body = Evar_empty} in
-    sigma, e_body in
-  let ex_value hole =
-    match kind hole with Evar (e,_) -> e | _ -> assert false in
-  let mk_upat_for ?hack env sigma0 (sigma, t) ?(p=t) ok =
-    let sigma,pat= mk_tpattern ?hack env sigma0 (sigma,p) ok L2R (fs sigma t) in
-    sigma, [pat] in
-  match pattern with
-  | None -> do_subst env0 concl0 concl0 1, UState.empty
-  | Some (sigma, (T rp | In_T rp)) -> 
-    let rp = fs sigma rp in
-    let ise = create_evar_defs sigma in
-    let occ = match pattern with Some (_, T _) -> occ | _ -> noindex in
-    let rp = mk_upat_for env0 sigma0 (ise, rp) all_ok in
-    let find_T, end_T = mk_tpattern_matcher ?raise_NoMatch sigma0 occ rp in
-    let concl = find_T env0 concl0 1 ~k:do_subst in
-    let _, _, (_, us, _) = end_T () in
-    concl, us
-  | Some (sigma, (X_In_T (hole, p) | In_X_In_T (hole, p))) ->
-    let p = fs sigma p in
-    let occ = match pattern with Some (_, X_In_T _) -> occ | _ -> noindex in
-    let ex = ex_value hole in
-    let rp = mk_upat_for ~hack:true env0 sigma0 (sigma, p) all_ok in
-    let find_T, end_T = mk_tpattern_matcher sigma0 noindex rp in
-    (* we start from sigma, so hole is considered a rigid head *)
-    let holep = mk_upat_for env0 sigma (sigma, hole) all_ok in
-    let find_X, end_X = mk_tpattern_matcher ?raise_NoMatch sigma occ holep in
-    let concl = find_T env0 concl0 1 ~k:(fun env c _ h ->
-      let p_sigma = unify_HO env (create_evar_defs sigma) (EConstr.of_constr c) (EConstr.of_constr p) in
-      let sigma, e_body = pop_evar p_sigma ex p in
-      fs p_sigma (find_X env (fs sigma p) h 
-        ~k:(fun env _ -> do_subst env e_body))) in
-    let _ = end_X () in let _, _, (_, us, _) = end_T () in
-    concl, us
-  | Some (sigma, E_In_X_In_T (e, hole, p)) ->
-    let p, e = fs sigma p, fs sigma e in
-    let ex = ex_value hole in
-    let rp = mk_upat_for ~hack:true env0 sigma0 (sigma, p) all_ok in
-    let find_T, end_T = mk_tpattern_matcher sigma0 noindex rp in
-    let holep = mk_upat_for env0 sigma (sigma, hole) all_ok in
-    let find_X, end_X = mk_tpattern_matcher sigma noindex holep in
-    let re = mk_upat_for env0 sigma0 (sigma, e) all_ok in
-    let find_E, end_E = mk_tpattern_matcher ?raise_NoMatch sigma0 occ re in
-    let concl = find_T env0 concl0 1 ~k:(fun env c _ h ->
-      let p_sigma = unify_HO env (create_evar_defs sigma) (EConstr.of_constr c) (EConstr.of_constr p) in
-      let sigma, e_body = pop_evar p_sigma ex p in
-      fs p_sigma (find_X env (fs sigma p) h ~k:(fun env c _ h ->
-        find_E env e_body h ~k:do_subst))) in
-    let _,_,(_,us,_) = end_E () in
-    let _ = end_X () in let _ = end_T () in
-    concl, us
-  | Some (sigma, E_As_X_In_T (e, hole, p)) ->
-    let p, e = fs sigma p, fs sigma e in
-    let ex = ex_value hole in
-    let rp = 
-      let e_sigma = unify_HO env0 sigma (EConstr.of_constr hole) (EConstr.of_constr e) in
-      e_sigma, fs e_sigma p in
-    let rp = mk_upat_for ~hack:true env0 sigma0 rp all_ok in
-    let find_TE, end_TE = mk_tpattern_matcher sigma0 noindex rp in
-    let holep = mk_upat_for env0 sigma (sigma, hole) all_ok in
-    let find_X, end_X = mk_tpattern_matcher sigma occ holep in
-    let concl = find_TE env0 concl0 1 ~k:(fun env c _ h ->
-      let p_sigma = unify_HO env (create_evar_defs sigma) (EConstr.of_constr c) (EConstr.of_constr p) in
-      let sigma, e_body = pop_evar p_sigma ex p in
-      fs p_sigma (find_X env (fs sigma p) h ~k:(fun env c _ h ->
-        let e_sigma = unify_HO env sigma (EConstr.of_constr e_body) (EConstr.of_constr e) in
-        let e_body = fs e_sigma e in
-        do_subst env e_body e_body h))) in
-    let _ = end_X () in let _,_,(_,us,_) = end_TE () in
-    concl, us
-;;
-
-let redex_of_pattern ?(resolve_typeclasses=false) env (sigma, p) =
-  let e = match p with
-  | In_T _ | In_X_In_T _ -> CErrors.anomaly (str"pattern without redex.")
-  | T e | X_In_T (e, _) | E_As_X_In_T (e, _, _) | E_In_X_In_T (e, _, _) -> e in
-  let sigma =
-    if not resolve_typeclasses then sigma
-    else Typeclasses.resolve_typeclasses ~fail:false env sigma in
-  nf_evar sigma e, Evd.evar_universe_context sigma
-
-let fill_occ_pattern ?raise_NoMatch env sigma cl pat occ h =
-  let do_make_rel, occ =
-    if occ = Some(true,[]) then false, Some(false,[1]) else true, occ in
-  let find_R, conclude =
-    let r = ref None in
-    (fun env c _ h' ->
-       do_once r (fun () -> c);
-       if do_make_rel then mkRel (h'+h-1) else c),
-    (fun _ -> if !r = None then fst(redex_of_pattern env pat)
-                           else assert_done r) in
-  let cl, us =
-    eval_pattern ?raise_NoMatch env sigma cl (Some pat) occ find_R in
-  let e = conclude cl in
-  (e, us), cl
-;;
-
-(* clenup interface for external use *)
-let mk_tpattern ?p_origin env sigma0 sigma_t f dir c = 
-  mk_tpattern ?p_origin env sigma0 sigma_t f dir c
-;;
-
-let eval_pattern ?raise_NoMatch env0 sigma0 concl0 pattern occ do_subst =
-  fst (eval_pattern ?raise_NoMatch env0 sigma0 concl0 pattern occ do_subst)
-;;
-
-let pf_fill_occ env concl occ sigma0 p (sigma, t) ok h =
- let p = EConstr.Unsafe.to_constr p in
- let concl = EConstr.Unsafe.to_constr concl in
- let ise = create_evar_defs sigma in
- let ise, u = mk_tpattern env sigma0 (ise,EConstr.Unsafe.to_constr t) ok L2R p in
- let find_U, end_U =
-   mk_tpattern_matcher ~raise_NoMatch:true sigma0 occ (ise,[u]) in
- let concl = find_U env concl h ~k:(fun _ _ _ -> mkRel) in
- let rdx, _, (sigma, uc, p) = end_U () in
- sigma, uc, EConstr.of_constr p, EConstr.of_constr concl, EConstr.of_constr rdx
-
-let fill_occ_term env cl occ sigma0 (sigma, t) =
-  try
-    let sigma',uc,t',cl,_= pf_fill_occ env cl occ sigma0 t (sigma, t) all_ok 1 in
-    if sigma' != sigma0 then CErrors.user_err Pp.(str "matching impacts evars")
-    else cl, (Evd.merge_universe_context sigma' uc, t')
-  with NoMatch -> try
-    let sigma', uc, t' =
-      unif_end env sigma0 (create_evar_defs sigma) t (fun _ -> true) in
-    if sigma' != sigma0 then raise NoMatch
-    else cl, (Evd.merge_universe_context sigma' uc, t')
-  with _ ->
-    errorstrm (str "partial term " ++ pr_constr_pat (EConstr.Unsafe.to_constr t)
-            ++ str " does not match any subterm of the goal")
-
-let pf_fill_occ_term gl occ t =
-  let sigma0 = project gl and env = pf_env gl and concl = pf_concl gl in
-  let cl,(_,t) = fill_occ_term env concl occ sigma0 t in
-  cl, t
-
-let cpattern_of_id id =
-  ' ', (DAst.make @@ GRef (VarRef  id, None), None), Some Geninterp.({ lfun = Id.Map.empty; extra = Tacinterp.TacStore.empty })
-
-let is_wildcard ((_, (l, r), _) : cpattern) : bool = match DAst.get l, r with
-  | _, Some { CAst.v = CHole _ } | GHole _, None -> true
-  | _ -> false
-
-(* "ssrpattern" *)
-
-ARGUMENT EXTEND ssrpatternarg TYPED AS rpattern PRINTED BY pr_rpattern
-| [ rpattern(pat) ] -> [ pat ]
-END
-
-let pr_rpattern = pr_pattern
-  
-let pf_merge_uc uc gl =
-  re_sig (sig_it gl) (Evd.merge_universe_context (project gl) uc)
-
-let pf_unsafe_merge_uc uc gl =
-  re_sig (sig_it gl) (Evd.set_universe_context (project gl) uc)
-
-let interp_rpattern = interp_rpattern ~wit_ssrpatternarg
-
-let ssrpatterntac _ist arg gl =
-  let pat = interp_rpattern gl arg in
-  let sigma0 = project gl in
-  let concl0 = pf_concl gl in
-  let concl0 = EConstr.Unsafe.to_constr concl0 in
-  let (t, uc), concl_x =
-    fill_occ_pattern (Global.env()) sigma0 concl0 pat noindex 1 in
-  let t = EConstr.of_constr t in
-  let concl_x = EConstr.of_constr concl_x in
-  let gl, tty = pf_type_of gl t in
-  let concl = EConstr.mkLetIn (Name (Id.of_string "selected"), t, tty, concl_x) in
-  Proofview.V82.of_tactic (convert_concl concl DEFAULTcast) gl
-
-(* Register "ssrpattern" tactic *)
-let () =
-  let mltac _ ist =
-    let arg =
-      let v = Id.Map.find (Names.Id.of_string "pattern") ist.lfun in
-      Value.cast (topwit wit_ssrpatternarg) v in
-    Proofview.V82.tactic (ssrpatterntac ist arg) in
-  let name = { mltac_plugin = "ssrmatching_plugin"; mltac_tactic = "ssrpattern"; } in
-  let () = Tacenv.register_ml_tactic name [|mltac|] in
-  let tac =
-    TacFun ([Name (Id.of_string "pattern")],
-      TacML (Loc.tag ({ mltac_name = name; mltac_index = 0 }, []))) in
-  let obj () =
-    Tacenv.register_ltac true false (Id.of_string "ssrpattern") tac in
-  Mltop.declare_cache_obj obj "ssrmatching_plugin"
-
-let ssrinstancesof arg gl =
-  let ok rhs lhs ise = true in
-(*   not (equal lhs (Evarutil.nf_evar ise rhs)) in *)
-  let env, sigma, concl = pf_env gl, project gl, pf_concl gl in
-  let concl = EConstr.Unsafe.to_constr concl in
-  let sigma0, cpat = interp_cpattern gl arg None in
-  let pat = match cpat with T x -> x | _ -> errorstrm (str"Not supported") in
-  let etpat, tpat = mk_tpattern env sigma (sigma0,pat) (ok pat) L2R pat in
-  let find, conclude =
-    mk_tpattern_matcher ~all_instances:true ~raise_NoMatch:true
-      sigma None (etpat,[tpat]) in
-  let print env p c _ = ppnl (hov 1 (str"instance:" ++ spc() ++ pr_constr_env (pf_env gl) (gl.sigma) p ++ spc()
-                                     ++ str "matches:" ++ spc() ++ pr_constr_env (pf_env gl) (gl.sigma)  c)); c in
-  ppnl (str"BEGIN INSTANCES");
-  try
-    while true do
-      ignore(find env concl 1 ~k:print)
-    done; raise NoMatch
-  with NoMatch -> ppnl (str"END INSTANCES"); tclIDTAC gl
-
-TACTIC EXTEND ssrinstoftpat
-| [ "ssrinstancesoftpat" cpattern(arg) ] -> [ Proofview.V82.tactic (ssrinstancesof arg) ]
-END
-
-(* We wipe out all the keywords generated by the grammar rules we defined. *)
-(* The user is supposed to Require Import ssreflect or Require ssreflect   *)
-(* and Import ssreflect.SsrSyntax to obtain these keywords and as a         *)
-(* consequence the extended ssreflect grammar.                             *)
-let () = CLexer.set_keyword_state frozen_lexer ;;
-
-(* vim: set filetype=ocaml foldmethod=marker: *)