X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Ftactics%2FprimitiveTactics.ml;h=2862d3c5d44263b414866938c5aca99fb76aef6a;hb=HEAD;hp=420934944a648f3ce3ccbaabe52f8a8fe88541fd;hpb=dcef667a444aa0f189225855c1433d26b65fb8b7;p=helm.git

diff --git a/helm/software/components/tactics/primitiveTactics.ml b/helm/software/components/tactics/primitiveTactics.ml
index 420934944..2862d3c5d 100644
--- a/helm/software/components/tactics/primitiveTactics.ml
+++ b/helm/software/components/tactics/primitiveTactics.ml
@@ -526,16 +526,16 @@ let mk_predicate_for_elim
          let map (_context_of_t, t) l = t :: l in
          let what = List.fold_right map selected_terms [] in
          let arg' = MS.apply_subst subst arg' in
-         let argty = MS.apply_subst subst argty in
          let pred = PER.replace_with_rel_1_from ~equality:(==) ~what 1 pred in
          let pred = MS.apply_subst subst pred in
-         let pred = C.Lambda (fresh_name, argty, pred) in
+	 let pred = C.Lambda (fresh_name, C.Implicit None, pred) in
 	 let cpattern' = C.Lambda (C.Anonymous, C.Implicit None, cpattern') in
          mk_pred metasenv subst (hyp :: context') pred arg' cpattern' tail 
    in
    let metasenv, subst, pred, arg = 
       mk_pred metasenv subst context goal arg cpattern (List.rev actual_args)
    in
+   HLog.debug ("PREDICATE CONTEXT:\n" ^ CicPp.ppcontext ~metasenv context);
    HLog.debug ("PREDICATE: " ^ CicPp.ppterm ~metasenv pred ^ " ARGS: " ^ String.concat " " (List.map (CicPp.ppterm ~metasenv) actual_args));
    metasenv, subst, pred, arg, actual_args
 
@@ -847,6 +847,10 @@ let elim_tac ?using ?(pattern = PET.conclusion_pattern None) term =
       let refined_term,_refined_termty,metasenv'',subst,_ugraph = 
          CicRefine.type_of metasenv' subst context term_to_refine ugraph
       in
+      let ipred = match refined_term with
+         | C.Appl ts -> List.nth ts (List.length ts - pred_pos)
+	 | _         -> assert false
+      in
       let new_goals =
          ProofEngineHelpers.compare_metasenvs
             ~oldmetasenv:metasenv ~newmetasenv:metasenv''
@@ -864,8 +868,9 @@ let elim_tac ?using ?(pattern = PET.conclusion_pattern None) term =
       in
       let res = proof'', patched_new_goals in
       let upto = List.length actual_args in
-      if upto = 0 then res else 
-      let continuation = beta_after_elim_tac upto pred in
+      if upto = 0 then res else
+(* FG: we use ipred (instantiated pred) instead of pred (not instantiated) *)
+      let continuation = beta_after_elim_tac upto ipred in
       let dummy_status = proof,goal in
       PET.apply_tactic
          (T.then_ ~start:(PET.mk_tactic (fun _ -> res)) ~continuation)