X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicTypeChecker.ml;h=6f516b8db6eb010aaac1e3a6d449de901843f333;hb=67dd51c6c9ceb0186490033d77769d49404964ac;hp=99829c4a7c67e62a6a5dc84e9d5d3e354879d0d9;hpb=94224469bd2c6a410e9cadecd4f2c5e87be082e8;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicTypeChecker.ml b/helm/software/components/ng_kernel/nCicTypeChecker.ml
index 99829c4a7..6f516b8db 100644
--- a/helm/software/components/ng_kernel/nCicTypeChecker.ml
+++ b/helm/software/components/ng_kernel/nCicTypeChecker.ml
@@ -70,13 +70,17 @@ let string_of_recfuns ~subst ~metasenv ~context l =
 
 let fixed_args bos j n nn =
  let rec aux k acc = function
-  | NCic.Appl (NCic.Rel i::args) when i+k > n && i+k <= nn ->
-      (try 
-        let lefts, _ = HExtlib.split_nth j args in
-        List.map (fun ((b,x),i) -> b && x = NCic.Rel (k-i)) 
-          (HExtlib.list_mapi (fun x i -> x,i) (List.combine acc lefts))
-      with Failure "HExtlib.split_nth" -> assert false)
-        (* se sono meno di j, fino a j deduco, dopo false *)
+  | NCic.Appl (NCic.Rel i::args) when i-k > n && i-k <= nn ->
+     let rec combine l1 l2 =
+      match l1,l2 with
+         [],[] -> []
+       | he1::tl1, he2::tl2 -> (he1,he2)::combine tl1 tl2
+       | he::tl, [] -> (false,NCic.Rel ~-1)::combine tl [] (* dummy term *)
+       | [],_::_ -> assert false
+     in
+     let lefts, _ = HExtlib.split_nth (min j (List.length args)) args in
+      List.map (fun ((b,x),i) -> b && x = NCic.Rel (k-i)) 
+       (HExtlib.list_mapi (fun x i -> x,i) (combine acc lefts))
   | t -> NCicUtils.fold (fun _ k -> k+1) k aux acc t    
  in
   List.fold_left (aux 0) 
@@ -606,7 +610,7 @@ exception NotGuarded of string Lazy.t;;
 
 let rec typeof ~subst ~metasenv context term =
   let rec typeof_aux context = 
-    fun t -> (*prerr_endline (NCicPp.ppterm ~context t); *)
+    fun t -> (*prerr_endline (NCicPp.ppterm ~metasenv ~subst ~context t);*)
     match t with
     | C.Rel n ->
        (try