X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=helm%2Focaml%2Ftactics%2FprimitiveTactics.ml;h=c411340ae829ee94159f7ac90e5d0e76c7882a71;hb=82f5b3f4124fe5fb3b1e578fe1912c1aeb1d8a86;hp=e318bd87c562c31547208b944565c1200a1cee1c;hpb=80d680bbbd13116576c961508e3c5631f218308d;p=helm.git

diff --git a/helm/ocaml/tactics/primitiveTactics.ml b/helm/ocaml/tactics/primitiveTactics.ml
index e318bd87c..c411340ae 100644
--- a/helm/ocaml/tactics/primitiveTactics.ml
+++ b/helm/ocaml/tactics/primitiveTactics.ml
@@ -260,7 +260,7 @@ let
     new_fresh_meta,newmetasenvfragment,exp_named_subst',exp_named_subst_diff
 ;;
 
-let apply_tac ~term (proof, goal) =
+let apply_tac_verbose ~term (proof, goal) =
   (* Assumption: The term "term" must be closed in the current context *)
  let module T = CicTypeChecker in
  let module R = CicReduction in
@@ -328,15 +328,27 @@ let apply_tac ~term (proof, goal) =
              Cic.Appl (term'::arguments)
            )
          in
-          let newmetasenv'' = new_uninstantiatedmetas@old_uninstantiatedmetas in
-          let (newproof, newmetasenv''') =
-           let subst_in =
-             CicMetaSubst.apply_subst ((metano,(context, bo'))::subst)
-           in
-            subst_meta_and_metasenv_in_proof
-              proof metano subst_in newmetasenv''
-          in
-           (newproof, List.map (function (i,_,_) -> i) new_uninstantiatedmetas)
+         let newmetasenv'' = new_uninstantiatedmetas@old_uninstantiatedmetas in
+         let subst_in =
+           (* if we just apply the subtitution, the type is irrelevant:
+	      we may use Implicit, since it will be dropped *)
+           CicMetaSubst.apply_subst 
+	     ((metano,(context, bo', Cic.Implicit None))::subst)
+         in
+         let (newproof, newmetasenv''') =
+           subst_meta_and_metasenv_in_proof
+             proof metano subst_in newmetasenv''
+         in
+           (subst_in,(newproof, List.map (function (i,_,_) -> i) new_uninstantiatedmetas))
+
+let apply_tac ~term status = snd (apply_tac_verbose ~term status)
+
+let apply_tac_verbose ~term status =
+  try
+    apply_tac_verbose ~term status
+      (* TODO cacciare anche altre eccezioni? *)
+  with CicUnification.UnificationFailure _ as e ->
+    raise (Fail (Printexc.to_string e))
 
   (* TODO per implementare i tatticali e' necessario che tutte le tattiche
   sollevino _solamente_ Fail *)