A temporary patch to demodulation theorem.

[helm.git] / helm / software / components / tactics / equalityTactics.ml

diff --git a/helm/software/components/tactics/equalityTactics.ml b/helm/software/components/tactics/equalityTactics.ml
index 72a63571cef7221ae211360b5d44f58ba36a2f20..16aa6d3b2d5925a10b1ab3bf7e47583885365c2f 100644 (file)
--- a/helm/software/components/tactics/equalityTactics.ml
+++ b/helm/software/components/tactics/equalityTactics.ml
@@ -46,8 +46,6 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
   let proof,goal = status in
   let curi, metasenv, _subst, pbo, pty, attrs = proof in
   let (metano,context,gty) = CicUtil.lookup_meta goal metasenv in
-  let gsort,_ =
-   CicTypeChecker.type_of_aux' metasenv context gty CicUniv.oblivion_ugraph in
   match hyps_pat with
      he::(_::_ as tl) ->
        PET.apply_tactic
@@ -70,15 +68,7 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
    match hyps_pat with
       [] -> None,true,(fun ~term _ -> P.exact_tac term),concl_pat,gty
     | [name,pat] ->
-      let rec find_hyp n =
-       function
-          [] -> assert false
-        | Some (Cic.Name s,Cic.Decl ty)::_ when name = s ->
-           Cic.Rel n, S.lift n ty
-        | Some (Cic.Name s,Cic.Def _)::_ when name = s -> assert false (*CSC: not implemented yet! But does this make any sense?*)
-        | _::tl -> find_hyp (n+1) tl
-      in
-       let arg,gty = find_hyp 1 context in
+       let arg,gty = ProofEngineHelpers.find_hyp name context in
        let dummy = "dummy" in
         Some arg,false,
          (fun ~term typ ->
@@ -97,6 +87,8 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
          Some pat,gty
     | _::_ -> assert false
   in
+  let gsort,_ =
+   CicTypeChecker.type_of_aux' metasenv context gty CicUniv.oblivion_ugraph in
   let if_right_to_left do_not_change a b = 
     match direction with
     | `RightToLeft -> if do_not_change then a else b
@@ -104,7 +96,7 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
   in
   let ty_eq,ugraph = 
     CicTypeChecker.type_of_aux' metasenv context equality 
-      CicUniv.empty_ugraph in 
+      CicUniv.oblivion_ugraph in 
   let (ty_eq,metasenv',arguments,fresh_meta) =
    TermUtil.saturate_term
     (ProofEngineHelpers.new_meta_of_proof proof) metasenv context ty_eq 0 in  
@@ -206,8 +198,8 @@ let rec rewrite_tac ~direction ~pattern:(wanted,hyps_pat,concl_pat) equality =
     in
      (proof',goals)
   with (* FG: this should be PET.Fail _ *)
-     TC.TypeCheckerFailure _ -> 
-      let msg = lazy "rewrite: nothing to rewrite" in
+     TC.TypeCheckerFailure m -> 
+      let msg = lazy ("rewrite: "^ Lazy.force m) in
       raise (PET.Fail msg)
  in    
   PET.mk_tactic _rewrite_tac 
@@ -241,7 +233,7 @@ let replace_tac ~(pattern: ProofEngineTypes.lazy_pattern) ~with_what =
   in
   let context_len = List.length context in
   let subst,metasenv,u,_,selected_terms_with_context =
-   ProofEngineHelpers.select ~metasenv ~ugraph:CicUniv.empty_ugraph
+   ProofEngineHelpers.select ~metasenv ~ugraph:CicUniv.oblivion_ugraph
     ~conjecture ~pattern in
   let metasenv = CicMetaSubst.apply_subst_metasenv subst metasenv in
   let with_what, metasenv, u = with_what context metasenv u in
@@ -251,7 +243,7 @@ let replace_tac ~(pattern: ProofEngineTypes.lazy_pattern) ~with_what =
   let status = (uri,metasenv,_subst,pbo,pty, attrs),goal in
   let ty_of_with_what,u =
    CicTypeChecker.type_of_aux'
-    metasenv context with_what CicUniv.empty_ugraph in
+    metasenv context with_what CicUniv.oblivion_ugraph in
   let whats =
    match selected_terms_with_context with
       [] -> raise (ProofEngineTypes.Fail (lazy "Replace: no term selected"))
@@ -278,7 +270,7 @@ let replace_tac ~(pattern: ProofEngineTypes.lazy_pattern) ~with_what =
              (lazy "Replace: one of the selected terms is not closed")) in
          let ty_of_t_in_context,u = (* TASSI: FIXME *)
           CicTypeChecker.type_of_aux' metasenv context t_in_context
-           CicUniv.empty_ugraph in
+           CicUniv.oblivion_ugraph in
          let b,u = CicReduction.are_convertible ~metasenv context
           ty_of_with_what ty_of_t_in_context u in
          if b then