X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_refiner%2FnCicUnification.ml;h=5353363d507bcbac84e6e939daa89dc0a343c038;hb=5858c6b8895010b580b6d7be26a962e7ed74cce4;hp=9ee056aed4f6a6911ea11c658bafe4873c019494;hpb=dcdbb979433a61e2ef2842d96604098728824416;p=helm.git diff --git a/helm/software/components/ng_refiner/nCicUnification.ml b/helm/software/components/ng_refiner/nCicUnification.ml index 9ee056aed..5353363d5 100644 --- a/helm/software/components/ng_refiner/nCicUnification.ml +++ b/helm/software/components/ng_refiner/nCicUnification.ml @@ -78,23 +78,43 @@ let eta_reduce subst t = module C = NCic;; module Ref = NReference;; +let debug = ref false;; let indent = ref "";; -let inside c = indent := !indent ^ String.make 1 c;; -let outside () = indent := String.sub !indent 0 (String.length !indent -1);; - -let pp s = +let pp s = + if !debug then prerr_endline (Printf.sprintf "%-20s" !indent ^ " " ^ Lazy.force s) -;; + else + () +;; +let inside c = + indent := !indent ^ String.make 1 c; + if !debug then prerr_endline ("{{{" ^ !indent ^ " ") +;; +let outside ok = + if !debug then prerr_endline "}}}"; + if not ok then pp (lazy "exception raised!"); + try + indent := String.sub !indent 0 (String.length !indent -1) + with + Invalid_argument _ -> indent := "??"; () +;; -let pp _ = ();; +let ppcontext ~metasenv ~subst c = + "\nctx:\n"^ NCicPp.ppcontext ~metasenv ~subst c +;; +let ppmetasenv ~subst m = "\nmenv:\n" ^ NCicPp.ppmetasenv ~subst m;; -let fix_sorts swap metasenv subst context meta t = +let ppcontext ~metasenv:_metasenv ~subst:_subst _context = "";; +let ppmetasenv ~subst:_subst _metasenv = "";; + +let fix_sorts swap exc t = let rec aux () = function | NCic.Sort (NCic.Type u) as orig -> if swap then match NCicEnvironment.sup u with - | None -> prerr_endline "no sup for" ; - raise (fail_exc metasenv subst context meta t) + | None -> + prerr_endline ("no sup for " ^ NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] orig) ; + raise exc | Some u1 -> if u = u1 then orig else NCic.Sort (NCic.Type u1) else NCic.Sort (NCic.Type ( @@ -110,29 +130,67 @@ let fix_sorts swap metasenv subst context meta t = let is_locked n subst = try match NCicUtils.lookup_subst n subst with - | Some tag, _,_,_ when NCicMetaSubst.is_out_scope_tag tag -> true + | tag, _,_,_ when NCicMetaSubst.is_out_scope_tag tag -> true | _ -> false with NCicUtils.Subst_not_found _ -> false ;; +let rec mk_irl stop base = + if base > stop then [] + else (NCic.Rel base) :: mk_irl stop (base+1) +;; + +(* the argument must be a term in whd *) +let rec could_reduce = + function + | C.Meta _ -> true + | C.Appl (C.Const (Ref.Ref (_,Ref.Fix (_,recno,_)))::args) + when List.length args > recno -> could_reduce (List.nth args recno) + | C.Match (_,_,arg,_) -> could_reduce arg + | C.Appl (he::_) -> could_reduce he + | C.Sort _ | C.Rel _ | C.Prod _ | C.Lambda _ | C.Const _ -> false + | C.Appl [] | C.LetIn _ | C.Implicit _ -> assert false +;; -let rec lambda_intros metasenv subst context t args = +let rec lambda_intros rdb metasenv subst context t args = let tty = NCicTypeChecker.typeof ~metasenv ~subst context t in - let argsty = List.map (NCicTypeChecker.typeof ~metasenv ~subst context) args in - let rec mk_lambda context n = function - | [] -> + let argsty = + List.map + (fun arg -> arg, NCicTypeChecker.typeof ~metasenv ~subst context arg) args in + let context_of_args = context in + let rec mk_lambda metasenv subst context n processed_args = function + | [] -> let metasenv, _, bo, _ = NCicMetaSubst.mk_meta metasenv context (`WithType (NCicSubstitution.lift n tty)) in - metasenv, bo - | ty::tail -> + metasenv, subst, bo + | (arg,ty)::tail -> + pp(lazy("arg{ " ^ + NCicPp.ppterm ~metasenv ~subst ~context:context_of_args arg ^ " : " ^ + NCicPp.ppterm ~metasenv ~subst ~context:context_of_args ty)); + let metasenv, subst, telescopic_ty = + if processed_args = [] then metasenv, subst, ty else + let _ = pp(lazy("delift")) in + delift_type_wrt_terms rdb metasenv subst context + (NCicSubstitution.lift n ty) + (List.map (NCicSubstitution.lift n) (List.rev processed_args)) + in + pp(lazy("arg} "^NCicPp.ppterm ~metasenv ~subst ~context telescopic_ty)); let name = "HBeta"^string_of_int n in - let ty = NCicSubstitution.lift n ty in - let metasenv, bo = mk_lambda ((name,NCic.Decl ty)::context) (n+1) tail in - metasenv, NCic.Lambda (name, ty, bo) + let metasenv, subst, bo = + mk_lambda metasenv subst ((name,NCic.Decl telescopic_ty)::context) (n+1) + (arg::processed_args) tail + in + metasenv, subst, NCic.Lambda (name, telescopic_ty, bo) in - mk_lambda context 0 argsty + pp(lazy("LAMBDA_INTROS{ " ^ + NCicPp.ppterm ~metasenv ~subst ~context t ^ ":" ^ + NCicPp.ppterm ~metasenv ~subst ~context tty ^ " over " ^ + String.concat "," (List.map (NCicPp.ppterm ~metasenv ~subst ~context)args))); + let rc = mk_lambda metasenv subst context 0 [] argsty in + pp(lazy("LAMBDA_INTROS}")); + rc and instantiate rdb test_eq_only metasenv subst context n lc t swap = (*D*) inside 'I'; try let rc = @@ -142,58 +200,105 @@ and instantiate rdb test_eq_only metasenv subst context n lc t swap = if swap then unify rdb test_eq_only m s c t2 t1 else unify rdb test_eq_only m s c t1 t2 in - let name, ctx, ty = NCicUtils.lookup_meta n metasenv in + let has_tag = List.exists in + let tags, _, ty = NCicUtils.lookup_meta n metasenv in + (* on the types *) let metasenv, subst, t = match ty with | NCic.Implicit (`Typeof _) -> - metasenv,subst, t - (* fix_sorts swap metasenv subst context (NCic.Meta(n,lc)) t *) + pp(lazy("meta with no type")); + assert(has_tag ((=)`IsSort) tags); + metasenv, subst, t | _ -> - pp (lazy ( - "typeof: " ^ NCicPp.ppterm ~metasenv ~subst ~context t ^ "\nctx:\n"^ - NCicPp.ppcontext ~metasenv ~subst context ^ "\nmenv:\n"^ - NCicPp.ppmetasenv ~subst metasenv)); + let exc_to_be = fail_exc metasenv subst context (NCic.Meta (n,lc)) t in let t, ty_t = try t, NCicTypeChecker.typeof ~subst ~metasenv context t with - | NCicTypeChecker.AssertFailure msg -> - (pp (lazy "fine typeof (fallimento)"); - let ft=fix_sorts swap metasenv subst context (NCic.Meta (n,lc)) t in - if ft == t then - (prerr_endline ( ("ILLTYPED: " ^ - NCicPp.ppterm ~metasenv ~subst ~context t - ^ "\nBECAUSE:" ^ Lazy.force msg ^ "\nCONTEXT:\n" ^ - NCicPp.ppcontext ~metasenv ~subst context ^ "\nMENV:\n" ^ - NCicPp.ppmetasenv ~subst metasenv - )); - assert false) - else - try - pp (lazy ("typeof: " ^ - NCicPp.ppterm ~metasenv ~subst ~context ft)); - ft, NCicTypeChecker.typeof ~subst ~metasenv context ft - with NCicTypeChecker.AssertFailure _ -> - assert false) + | NCicTypeChecker.AssertFailure msg as exn -> + pp(lazy("we try to fix the sort\n"^ + Lazy.force msg^"\n"^NCicPp.ppmetasenv ~subst metasenv)); + let ft = fix_sorts swap exc_to_be t in + pp(lazy("unable to fix the sort")); + if ft == t then raise exn; + (try ft, NCicTypeChecker.typeof ~subst ~metasenv context ft + with NCicTypeChecker.AssertFailure _ -> raise exn) | NCicTypeChecker.TypeCheckerFailure msg -> prerr_endline (Lazy.force msg); - pp msg; assert false + prerr_endline (NCicPp.ppterm ~metasenv ~subst ~context t); + prerr_endline (ppcontext ~metasenv ~subst context); + prerr_endline (ppmetasenv ~subst metasenv); + assert false in - let lty = NCicSubstitution.subst_meta lc ty in match ty_t with - | NCic.Implicit _ -> - raise (UnificationFailure - (lazy "trying to unify a term with a type")) - | ty_t -> + | NCic.Implicit (`Typeof _) -> + raise (UnificationFailure(lazy "trying to unify a term with a type")) + | _ -> + let lty = NCicSubstitution.subst_meta lc ty in pp (lazy ("On the types: " ^ - NCicPp.ppterm ~metasenv ~subst ~context:ctx ty ^ " ~~~ " ^ - NCicPp.ppterm ~metasenv ~subst ~context lty ^ " === " - ^ NCicPp.ppterm ~metasenv ~subst ~context ty_t)); + NCicPp.ppterm ~metasenv ~subst ~context lty ^ " === " ^ + NCicPp.ppterm ~metasenv ~subst ~context ty_t)); let metasenv,subst = - unify test_eq_only metasenv subst context lty ty_t in - metasenv, subst, t + try unify test_eq_only metasenv subst context lty ty_t + with NCicEnvironment.BadConstraint _ as exc -> + let ty_t = fix_sorts swap exc_to_be ty_t in + try unify test_eq_only metasenv subst context lty ty_t + with + | NCicEnvironment.BadConstraint _ + | UnificationFailure _ -> raise exc + in + metasenv, subst, t + in + (* viral sortification *) + let is_sort metasenv subst context t = + match NCicReduction.whd ~subst context t with + | NCic.Meta (i,_) -> + let tags, _, _ = NCicUtils.lookup_meta i metasenv in + has_tag ((=) `IsSort) tags + | NCic.Sort _ -> true + | _ -> false in - pp (lazy(string_of_int n ^ " := 111 = "^ - NCicPp.ppterm ~metasenv ~subst ~context t)); + let rec sortify metasenv subst = function + | NCic.Implicit (`Typeof _) -> assert false + | NCic.Sort _ as t -> metasenv, subst, t, 0 + | NCic.Meta (i,_) as t -> + let tags, context, ty = NCicUtils.lookup_meta i metasenv in + if has_tag ((=) `IsSort) tags then metasenv, subst, t, i + else + let ty = NCicReduction.whd ~subst context ty in + let metasenv, subst, ty, _ = sortify metasenv subst ty in + let metasenv, j, m, _ = + NCicMetaSubst.mk_meta metasenv ~attrs:[`IsSort] [] (`WithType ty) + in + pp(lazy("rimpiazzo " ^ string_of_int i^" con "^string_of_int j)); + let subst_entry = i, (tags, context, m, ty) in + let subst = subst_entry :: subst in + let metasenv = List.filter (fun x,_ -> i <> x) metasenv in + metasenv, subst, m, j + | NCic.Appl (NCic.Meta _ as hd :: args) as t -> + let metasenv, subst, lambda_Mj = + lambda_intros rdb metasenv subst context t args + in + let metasenv,subst= unify true metasenv subst context hd lambda_Mj in + let t = NCicReduction.whd ~subst context t in + let _result = sortify metasenv subst t in + (* untested, maybe dead, code *) assert false; + | t -> + if could_reduce t then raise (Uncertain(lazy "not a sort")) + else raise (UnificationFailure(lazy "not a sort")) + in + let metasenv, subst, _, n = + if has_tag ((=) `IsSort) tags then + let m,s,x,_ = sortify metasenv subst (NCicReduction.whd ~subst context t) + in m,s,x,n + else if is_sort metasenv subst context t then + sortify metasenv subst (NCic.Meta (n,lc)) + else + metasenv, subst, NCic.Rel ~-1,n + in + let tags, ctx, ty = NCicUtils.lookup_meta n metasenv in + (* instantiation *) + pp (lazy(string_of_int n ^ " := 111 = "^ + NCicPp.ppterm ~metasenv ~subst ~context t)); let (metasenv, subst), t = try NCicMetaSubst.delift @@ -214,7 +319,7 @@ and instantiate rdb test_eq_only metasenv subst context n lc t swap = in pp (lazy(string_of_int n ^ " := 222 = "^ NCicPp.ppterm ~metasenv ~subst ~context:ctx t - ^ "\n" ^ NCicPp.ppmetasenv ~subst metasenv)); + ^ ppmetasenv ~subst metasenv)); (* Unifying the types may have already instantiated n. *) try let _, _,oldt,_ = NCicUtils.lookup_subst n subst in @@ -223,23 +328,38 @@ and instantiate rdb test_eq_only metasenv subst context n lc t swap = (* conjecture: always fail --> occur check *) unify test_eq_only metasenv subst context oldt t with NCicUtils.Subst_not_found _ -> + let metasenv, tags = + let rec aux = function + | NCic.Meta (j,lc) -> + (try + let _, _, t, _ = NCicUtils.lookup_subst j subst in + aux (NCicSubstitution.subst_meta lc t) + with NCicUtils.Subst_not_found _ -> + let tags', ctx, ty = NCicUtils.lookup_meta j metasenv in + let metasenv = List.remove_assoc j metasenv in + let tags = tags @ tags' in + (j, (tags, ctx, ty)) :: metasenv, tags) + | _ -> metasenv, tags + in + aux t + in (* by cumulativity when unify(?,Type_i) * we could ? := Type_j with j <= i... *) - let subst = (n, (name, ctx, t, ty)) :: subst in + let subst = (n, (tags, ctx, t, ty)) :: subst in pp (lazy ("?"^string_of_int n^" := "^NCicPp.ppterm ~metasenv ~subst ~context (NCicSubstitution.subst_meta lc t))); let metasenv = List.filter (fun (m,_) -> not (n = m)) metasenv in metasenv, subst - (*D*) in outside(); rc with exn -> outside (); raise exn + (*D*) in outside true; rc with exn -> outside false; raise exn and unify rdb test_eq_only metasenv subst context t1 t2 = (*D*) inside 'U'; try let rc = let fo_unif test_eq_only metasenv subst t1 t2 = (*D*) inside 'F'; try let rc = pp (lazy(" " ^ NCicPp.ppterm ~metasenv ~subst ~context t1 ^ " ==?== " ^ - NCicPp.ppterm ~metasenv ~subst ~context t2 ^ "\n" ^ NCicPp.ppmetasenv + NCicPp.ppterm ~metasenv ~subst ~context t2 ^ ppmetasenv ~subst metasenv)); if t1 === t2 then metasenv, subst @@ -305,17 +425,17 @@ and unify rdb test_eq_only metasenv subst context t1 t2 = | _, NCic.Meta (n, _) when is_locked n subst -> (let (metasenv, subst), i = match NCicReduction.whd ~subst context t1 with - | NCic.Appl (NCic.Meta (i,l)::args) when - not (NCicMetaSubst.flexible subst args) - -> - let metasenv, lambda_Mj = - lambda_intros metasenv subst context t1 args + | NCic.Appl (NCic.Meta (i,l)::args) -> + let metasenv, subst, lambda_Mj = + lambda_intros rdb metasenv subst context t1 args in unify rdb test_eq_only metasenv subst context (C.Meta (i,l)) lambda_Mj, i | NCic.Meta (i,_) -> (metasenv, subst), i - | _ -> assert false + | _ -> + raise (UnificationFailure (lazy "Locked term vs non + flexible term; probably not saturated enough yet!")) in let t1 = NCicReduction.whd ~subst context t1 in let j, lj = @@ -324,6 +444,17 @@ and unify rdb test_eq_only metasenv subst context t1 t2 = let metasenv, subst = instantiate rdb test_eq_only metasenv subst context j lj t2 true in + (* We need to remove the out_scope_tags to avoid propagation of + them that triggers again the ad-hoc case *) + let subst = + List.map (fun (i,(tag,ctx,bo,ty)) -> + let tag = + List.filter + (function `InScope | `OutScope _ -> false | _ -> true) tag + in + i,(tag,ctx,bo,ty) + ) subst + in (try let name, ctx, term, ty = NCicUtils.lookup_subst i subst in let term = eta_reduce subst term in @@ -371,45 +502,41 @@ and unify rdb test_eq_only metasenv subst context t1 t2 = with Invalid_argument _ -> raise (fail_exc metasenv subst context t1 t2)) - | NCic.Appl (NCic.Meta (i,l)::args), _ when - not (NCicMetaSubst.flexible subst args) -> - (* we verify that none of the args is a Meta, - since beta expanding w.r.t a metavariable makes no sense *) - let metasenv, lambda_Mj = - lambda_intros metasenv subst context t1 args - in - let metasenv, subst = - unify rdb test_eq_only metasenv subst context - (C.Meta (i,l)) lambda_Mj - in - let metasenv, subst = - unify rdb test_eq_only metasenv subst context t1 t2 - in - (try - let name, ctx, term, ty = NCicUtils.lookup_subst i subst in - let term = eta_reduce subst term in - let subst = List.filter (fun (j,_) -> j <> i) subst in - metasenv, ((i, (name, ctx, term, ty)) :: subst) - with Not_found -> assert false) + | NCic.Appl (NCic.Meta (i,l)::args), _ -> + let metasenv, subst, lambda_Mj = + lambda_intros rdb metasenv subst context t1 args + in + let metasenv, subst = + unify rdb test_eq_only metasenv subst context + (C.Meta (i,l)) lambda_Mj + in + let metasenv, subst = + unify rdb test_eq_only metasenv subst context t1 t2 + in + (try + let name, ctx, term, ty = NCicUtils.lookup_subst i subst in + let term = eta_reduce subst term in + let subst = List.filter (fun (j,_) -> j <> i) subst in + metasenv, ((i, (name, ctx, term, ty)) :: subst) + with Not_found -> assert false) - | _, NCic.Appl (NCic.Meta (i,l)::args) when - not(NCicMetaSubst.flexible subst args) -> - let metasenv, lambda_Mj = - lambda_intros metasenv subst context t2 args - in - let metasenv, subst = - unify rdb test_eq_only metasenv subst context - lambda_Mj (C.Meta (i,l)) - in - let metasenv, subst = - unify rdb test_eq_only metasenv subst context t1 t2 - in - (try - let name, ctx, term, ty = NCicUtils.lookup_subst i subst in - let term = eta_reduce subst term in - let subst = List.filter (fun (j,_) -> j <> i) subst in - metasenv, ((i, (name, ctx, term, ty)) :: subst) - with Not_found -> assert false) + | _, NCic.Appl (NCic.Meta (i,l)::args) -> + let metasenv, subst, lambda_Mj = + lambda_intros rdb metasenv subst context t2 args + in + let metasenv, subst = + unify rdb test_eq_only metasenv subst context + lambda_Mj (C.Meta (i,l)) + in + let metasenv, subst = + unify rdb test_eq_only metasenv subst context t1 t2 + in + (try + let name, ctx, term, ty = NCicUtils.lookup_subst i subst in + let term = eta_reduce subst term in + let subst = List.filter (fun (j,_) -> j <> i) subst in + metasenv, ((i, (name, ctx, term, ty)) :: subst) + with Not_found -> assert false) (* processing this case here we avoid a useless small delta step *) | (C.Appl ((C.Const r1) as _hd1::tl1), C.Appl (C.Const r2::tl2)) @@ -474,30 +601,26 @@ and unify rdb test_eq_only metasenv subst context t1 t2 = (fun (metasenv,subst) -> unify rdb test_eq_only metasenv subst context) (metasenv, subst) pl1 pl2 - with Invalid_argument _ -> - raise (uncert_exc metasenv subst context t1 t2)) + with Invalid_argument _ -> assert false) | (C.Implicit _, _) | (_, C.Implicit _) -> assert false | _ when NCicUntrusted.metas_of_term subst context t1 = [] && NCicUntrusted.metas_of_term subst context t2 = [] -> raise (fail_exc metasenv subst context t1 t2) | _ -> raise (uncert_exc metasenv subst context t1 t2) - (*D*) in outside(); rc with exn -> outside (); raise exn + (*D*) in outside true; rc with exn -> outside false; raise exn in let try_hints metasenv subst t1 t2 (* exc*) = -(* - prerr_endline ("\nProblema:\n" ^ + (*D*) inside 'H'; try let rc = + pp(lazy ("\nProblema:\n" ^ NCicPp.ppterm ~metasenv ~subst ~context t1 ^ " =?= " ^ - NCicPp.ppterm ~metasenv ~subst ~context t2); -*) + NCicPp.ppterm ~metasenv ~subst ~context t2)); let candidates = - NCicUnifHint.look_for_hint - rdb.NRstatus.uhint_db metasenv subst context t1 t2 + NCicUnifHint.look_for_hint rdb metasenv subst context t1 t2 in let rec cand_iter = function | [] -> None (* raise exc *) | (metasenv,(c1,c2),premises)::tl -> -(* - prerr_endline ("\nProvo il candidato:\n" ^ + pp (lazy ("\nProvo il candidato:\n" ^ String.concat "\n" (List.map (fun (a,b) -> @@ -505,9 +628,9 @@ and unify rdb test_eq_only metasenv subst context t1 t2 = NCicPp.ppterm ~metasenv ~subst ~context b) premises) ^ "\n-------------------------------------------\n"^ NCicPp.ppterm ~metasenv ~subst ~context c1 ^ " = " ^ - NCicPp.ppterm ~metasenv ~subst ~context c2); -*) + NCicPp.ppterm ~metasenv ~subst ~context c2)); try + (*D*) inside 'K'; try let rc = let metasenv,subst = fo_unif test_eq_only metasenv subst t1 c1 in let metasenv,subst = @@ -518,12 +641,15 @@ and unify rdb test_eq_only metasenv subst context t1 t2 = unify rdb test_eq_only metasenv subst context x y) (metasenv, subst) premises in + pp(lazy("FUNZIONA!")); Some (metasenv, subst) + (*D*) in outside true; rc with exn -> outside false; raise exn with UnificationFailure _ | Uncertain _ -> cand_iter tl in cand_iter candidates + (*D*) in outside true; rc with exn -> outside false; raise exn in let height_of = function | NCic.Const (Ref.Ref (_,Ref.Def h)) @@ -568,8 +694,8 @@ pp (lazy (string_of_bool norm1 ^ " ?? " ^ string_of_bool norm2)); | _ -> [] *) in let unif_from_stack t1 t2 b metasenv subst = try - let t1 = NCicReduction.from_stack t1 in - let t2 = NCicReduction.from_stack t2 in + let t1 = NCicReduction.from_stack ~delta:max_int t1 in + let t2 = NCicReduction.from_stack ~delta:max_int t2 in unif_machines metasenv subst (put_in_whd t1 t2) with UnificationFailure _ | Uncertain _ when not b -> metasenv, subst @@ -592,7 +718,7 @@ pp (lazy (string_of_bool norm1 ^ " ?? " ^ string_of_bool norm2)); ) (metasenv,subst) todo with UnificationFailure _ | Uncertain _ when not (norm1 && norm2) -> unif_machines metasenv subst (small_delta_step ~subst m1 m2) - (*D*) in outside(); rc with exn -> outside (); raise exn + (*D*) in outside true; rc with exn -> outside false; raise exn in try fo_unif test_eq_only metasenv subst t1 t2 with @@ -604,18 +730,46 @@ pp (lazy (string_of_bool norm1 ^ " ?? " ^ string_of_bool norm2)); | UnificationFailure _ -> raise (UnificationFailure msg) | Uncertain _ -> raise exn) | Uncertain msg as exn -> - match try_hints metasenv subst t1 t2 with +(* + prerr_endline "PROBLEMA"; + prerr_endline (NCicPp.ppterm ~metasenv ~subst ~context t1); + prerr_endline (NCicPp.ppterm ~metasenv ~subst ~context t2); +*) + let (t1,_ as t1m),(t2,_ as t2m) = put_in_whd (0,[],t1,[]) (0,[],t2,[]) in + match + try_hints metasenv subst + (NCicReduction.unwind t1) (NCicReduction.unwind t2) + with | Some x -> x | None -> try - unif_machines metasenv subst - (put_in_whd (0,[],t1,[]) (0,[],t2,[])) + unif_machines metasenv subst (t1m, t2m) with | UnificationFailure _ -> raise (UnificationFailure msg) | Uncertain _ -> raise exn - (*D*) in outside(); rc with exn -> outside (); raise exn + (*D*) in outside true; rc with exn -> outside false; raise exn + +and delift_type_wrt_terms rdb metasenv subst context t args = + let lc = List.rev args @ mk_irl (List.length context) (List.length args+1) in + let (metasenv, subst), t = + try + NCicMetaSubst.delift + ~unify:(fun m s c t1 t2 -> + let ind = !indent in + let res = + try Some (unify rdb false m s c t1 t2 ) + with UnificationFailure _ | Uncertain _ -> None + in + indent := ind; res) + metasenv subst context 0 (0,NCic.Ctx lc) t + with NCicMetaSubst.MetaSubstFailure _ -> (metasenv, subst), t + in + metasenv, subst, t ;; + let unify rdb ?(test_eq_only=false) = indent := ""; unify rdb test_eq_only;; + +let fix_sorts = fix_sorts true (UnificationFailure (lazy "no sup"));;