X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Ftactics%2FvariousTactics.ml;h=927552f0a60219c558dc35a38368541f90586ed7;hb=97c2d258a5c524eb5c4b85208899d80751a2c82f;hp=1f2e6b13c9bd312db7ec309b2d88cf1b045533c2;hpb=bb19a912c9d3d470163e88722e3abbd548b8bdb9;p=helm.git

diff --git a/helm/ocaml/tactics/variousTactics.ml b/helm/ocaml/tactics/variousTactics.ml
index 1f2e6b13c..927552f0a 100644
--- a/helm/ocaml/tactics/variousTactics.ml
+++ b/helm/ocaml/tactics/variousTactics.ml
@@ -55,7 +55,7 @@ let assumption_tac =
 		 if b then n else find (n+1) tl
            | _ -> find (n+1) tl
          )
-      | [] -> raise (PET.Fail "Assumption: No such assumption")
+      | [] -> raise (PET.Fail (lazy "Assumption: No such assumption"))
      in PET.apply_tactic (PT.apply_tac ~term:(C.Rel (find 1 context))) status
  in
   PET.mk_tactic assumption_tac
@@ -94,17 +94,35 @@ let generalize_tac
     let term =
      match term with
         None -> None
-      | Some term -> Some (CicMetaSubst.apply_subst subst term) in
-    let u,typ,term =
-     match terms_with_context, term with
-        [], None ->
-         raise UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly
-      | _, Some term
-      | (_,term)::_, None ->
-         let typ,u =
-          CicTypeChecker.type_of_aux' ~subst metasenv context term u
-         in
-          u,typ,term
+      | Some term ->
+          Some (fun context metasenv ugraph -> 
+                  let term, metasenv, ugraph = term context metasenv ugraph in
+                  CicMetaSubst.apply_subst subst term, metasenv, ugraph)
+    in
+    let u,typ,term, metasenv =
+     let context_of_t, (t, metasenv, u) =
+      match terms_with_context, term with
+         [], None ->
+          raise
+           UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly
+       | [], Some t -> context, t context metasenv u
+       | (context_of_t, _)::_, Some t -> 
+           context_of_t, t context_of_t metasenv u
+       | (context_of_t, t)::_, None -> context_of_t, (t, metasenv, u)
+     in
+      let t,subst,metasenv' =
+       try
+        CicMetaSubst.delift_rels [] metasenv
+         (List.length context_of_t - List.length context) t
+       with
+        CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
+         raise TheSelectedTermsMustLiveInTheGoalContext in
+      (*CSC: I am not sure about the following two assertions;
+        maybe I need to propagate the new subst and metasenv *)
+      assert (subst = []);
+      assert (metasenv' = metasenv);
+      let typ,u = CicTypeChecker.type_of_aux' ~subst metasenv context t u in
+       u,typ,t,metasenv
     in
     (* We need to check:
         1. whether they live in the context of the goal;
@@ -118,15 +136,17 @@ let generalize_tac
      List.fold_left
       (fun u (context_of_t,t) ->
         (* 1 *)
-        begin
+        let t,subst,metasenv' =
          try
-          ignore
-           (CicMetaSubst.delift_rels [] metasenv
-             (List.length context_of_t - List.length context) t)
+          CicMetaSubst.delift_rels [] metasenv
+           (List.length context_of_t - List.length context) t
          with
           CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
-           raise TheSelectedTermsMustLiveInTheGoalContext
-        end;
+           raise TheSelectedTermsMustLiveInTheGoalContext in
+        (*CSC: I am not sure about the following two assertions;
+          maybe I need to propagate the new subst and metasenv *)
+        assert (subst = []);
+        assert (metasenv' = metasenv);
         (* 2 *)
         let b,u1 = CicReduction.are_convertible ~subst context term t u in 
          if not b then