X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Ftactics%2Ftacticals.ml;h=4a4f150b7bf3e27eb6d7beacdc50df2d84c4d82e;hb=0e3324ad8e6a552ee89f02371412f7bc2e83379f;hp=f647ebccaa9d199181761b2233c59f00ace13f1d;hpb=a09cd4c4c08494249b2af35940c217599130507c;p=helm.git

diff --git a/helm/software/components/tactics/tacticals.ml b/helm/software/components/tactics/tacticals.ml
index f647ebcca..4a4f150b7 100644
--- a/helm/software/components/tactics/tacticals.ml
+++ b/helm/software/components/tactics/tacticals.ml
@@ -290,16 +290,18 @@ let solve_tactics ~tactics =
 
 let progress_tactic ~tactic =
   let msg = lazy "Failed to progress" in
-  let progress_tactic (((_,metasenv,_subst,_,_,_),_) as istatus) =
-    let ((_,metasenv',_subst,_,_,_),_) as ostatus =
+  let progress_tactic (((_,metasenv,_subst,_,_,_),g) as istatus) =
+    let ((_,metasenv',_subst,_,_,_),opened) as ostatus =
      PET.apply_tactic tactic istatus
     in
-     (*CSC: Warning
-       If just the index of some metas changes the tactic is recognized
-       as a progressing one. This is wrong. *)
-     if metasenv' = metasenv then
-      raise (PET.Fail msg)
-     else
-      ostatus
+    match opened with
+    | [g1] ->
+        let _,oc,oldty = CicUtil.lookup_meta g metasenv in
+        let _,nc,newty = CicUtil.lookup_meta g1 metasenv' in
+        if oldty = newty && oc = nc then
+          raise (PET.Fail msg)
+        else
+          ostatus
+    | _ -> ostatus
   in
   PET.mk_tactic progress_tactic