X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fcomponents%2Fng_refiner%2FnCicMetaSubst.ml;h=beeeeeb6b288a6c22cc0d8bfe28efd67c31066ef;hb=3220eee6c3dd2968727c5c595d6ca78e89291b5f;hp=f1fa293b338e866d2042dcbbb4ee6f0ae5b32bc9;hpb=4b54dde3aab6d58ab11c5bafd291b65af241e28e;p=helm.git

diff --git a/matita/components/ng_refiner/nCicMetaSubst.ml b/matita/components/ng_refiner/nCicMetaSubst.ml
index f1fa293b3..beeeeeb6b 100644
--- a/matita/components/ng_refiner/nCicMetaSubst.ml
+++ b/matita/components/ng_refiner/nCicMetaSubst.ml
@@ -47,10 +47,13 @@ let outside exc_opt =
 exception MetaSubstFailure of string Lazy.t
 exception Uncertain of string Lazy.t
 
-let newmeta,maxmeta = 
+let newmeta,maxmeta,pushmaxmeta,popmaxmeta = 
   let maxmeta = ref 0 in
+  let pushedmetas = ref [] in
   (fun () -> incr maxmeta; !maxmeta),
-  (fun () -> !maxmeta)
+  (fun () -> !maxmeta),
+  (fun () -> pushedmetas := !maxmeta::!pushedmetas; maxmeta := 0),
+  (fun () -> match !pushedmetas with [] -> assert false | _hd::tl -> pushedmetas := tl)
 ;;
 
 exception NotFound of [`NotInTheList | `NotWellTyped];;
@@ -260,18 +263,20 @@ and restrict status metasenv subst i (restrictions as orig) =
 ;;
 
 let rec is_flexible status context ~subst = function 
-  | NCic.Meta (i,_) ->
+  | NCic.Meta (i,lc) ->
+       (try 
+          let _,_,t,_ = NCicUtils.lookup_subst i subst in
+          let t = NCicSubstitution.subst_meta status lc t in
+          is_flexible status context ~subst t
+        with NCicUtils.Subst_not_found _ -> true)
+  | NCic.Appl (NCic.Meta (i,lc) :: args)-> 
       (try 
-        let _,_,t,_ = List.assoc i subst in
-        is_flexible status context ~subst t
-      with Not_found -> true)
-  | NCic.Appl (NCic.Meta (i,_) :: args)-> 
-      (try 
-        let _,_,t,_ = List.assoc i subst in
+        let _,_,t,_ = NCicUtils.lookup_subst i subst in
+        let t = NCicSubstitution.subst_meta status lc t in
         is_flexible status context ~subst 
           (NCicReduction.head_beta_reduce status ~delta:max_int 
             (NCic.Appl (t :: args)))
-      with Not_found -> true)
+      with NCicUtils.Subst_not_found _ -> true)
    (* this is a cheap whd, it only performs zeta-reduction.
     * 
     * it works when the **omissis** disambiguation algorithm
@@ -513,10 +518,14 @@ let delift status ~unify metasenv subst context n l t =
         NCicUtils.Meta_not_found _ ->
          (* Fake metavariable used in NTacStatus and NCicRefiner :-( *)
          assert (n = -1); res
+      | NCicTypeChecker.TypeCheckerFailure msg ->
+         HLog.error "----------- Problem with Dependent Types ----------";
+         HLog.error (Lazy.force msg) ;
+         HLog.error "---------------------------------------------------";
+         raise (NotFound `NotWellTyped)
       | TypeNotGood
       | NCicTypeChecker.AssertFailure _
-      | NCicReduction.AssertFailure _
-      | NCicTypeChecker.TypeCheckerFailure _ ->
+      | NCicReduction.AssertFailure _ ->
          raise (NotFound `NotWellTyped))
    with NotFound reason ->
       (* This is the case where we fail even first order unification. *)