in
if pragma <> `Projection || List.length args <= rno then conclude ()
else
- (match List.nth args rno with
+ (match List.nth l (rno+1) with
| C.Appl (C.Const(Ref.Ref(_,Ref.Con _))::_) ->
let _, _, _, _, fbody = List.nth ifl fno in (* fbody is closed! *)
- let t = C.Appl (fbody::args) in
+ let t = C.Appl (fbody::List.tl l) in
(match NCicReduction.head_beta_reduce ~delta:max_int t with
- | C.Match (_,_,C.Appl(C.Const(Ref.Ref(_,Ref.Con (_,_,leftno)))::kargs),[pat])->
+ | C.Match (_,_, C.Appl(C.Const(Ref.Ref(_,Ref.Con (_,_,leftno)))
+ ::kargs),[pat])->
let _,kargs = HExtlib.split_nth leftno kargs in
- fire_projection_redex false
- (NCicReduction.head_beta_reduce
- ~delta:max_int (C.Appl (pat :: kargs)))
- | C.Appl(C.Match(_,_,C.Appl(C.Const(Ref.Ref(_,Ref.Con (_,_,leftno)))::kargs),[pat]) :: args) ->
+ fire_projection_redex false
+ (NCicReduction.head_beta_reduce
+ ~delta:max_int (C.Appl (pat :: kargs)))
+ | C.Appl(C.Match(_,_,C.Appl(C.Const(Ref.Ref(_,Ref.Con (_,_,leftno)))
+ ::kargs),[pat]) :: args) ->
let _,kargs = HExtlib.split_nth leftno kargs in
- fire_projection_redex false
- (NCicReduction.head_beta_reduce
- ~delta:max_int (C.Appl (pat :: kargs @ args)))
+ fire_projection_redex false
+ (NCicReduction.head_beta_reduce
+ ~delta:max_int (C.Appl (pat :: kargs @ args)))
| _ -> conclude ())
| _ -> conclude ())
| t when on_args -> NCicUtils.map (fun _ x -> x) true fire_projection_redex t
let sort_metasenv subst (m : NCic.metasenv) =
(MS.topological_sort m (relations_of_menv subst m) : NCic.metasenv)
;;
+
+let count_occurrences ~subst n t =
+ let occurrences = ref 0 in
+ let rec aux k _ = function
+ | C.Rel m when m = n+k -> incr occurrences
+ | C.Rel _m -> ()
+ | C.Implicit _ -> ()
+ | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))) -> (* closed meta *) ()
+ | C.Meta (mno,(s,l)) ->
+ (try
+ (* possible optimization here: try does_not_occur on l and
+ perform substitution only if DoesOccur is raised *)
+ let _,_,term,_ = NCicUtils.lookup_subst mno subst in
+ aux (k-s) () (NCicSubstitution.subst_meta (0,l) term)
+ with NCicUtils.Subst_not_found _ -> () (*match l with
+ | C.Irl len -> if not (n+k >= s+len || s > nn+k) then raise DoesOccur
+ | C.Ctx lc -> List.iter (aux (k-s) ()) lc*))
+ | t -> NCicUtils.fold (fun _ k -> k + 1) k aux () t
+ in
+ aux 0 () t;
+ !occurrences
+;;
+
+exception Found_variable
+
+let looks_closed t =
+ let rec aux k _ = function
+ | C.Rel m when k < m -> raise Found_variable
+ | C.Rel _m -> ()
+ | C.Implicit _ -> ()
+ | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))) -> (* closed meta *) ()
+ | C.Meta _ -> raise Found_variable
+ | t -> NCicUtils.fold (fun _ k -> k + 1) k aux () t
+ in
+ try aux 0 () t; true with Found_variable -> false
+;;