now destruct takes an optional list of term rather than a sigle optional term

[helm.git] / components / tactics / declarative.ml

diff --git a/components/tactics/declarative.ml b/components/tactics/declarative.ml
index 2f012ed40d9eded87bf8fcf62c6c0dd929aafac6..c248d0cad0bf15c9bbe2119eec36346cf12fed86 100644 (file)
--- a/components/tactics/declarative.ml
+++ b/components/tactics/declarative.ml
@@ -63,18 +63,24 @@ let by_term_we_proved ~dbd ~universe t ty id ty' =
             ~continuation:just
       )
    | Some id ->
-       let continuation =
+       let ty',continuation =
         match ty' with
-           None -> Tacticals.id_tac
+           None -> ty,just
          | Some ty' ->
-             Tactics.change ~pattern:(None,[id,Cic.Implicit (Some `Hole)],None)
-              (fun _ metasenv ugraph -> ty',metasenv,ugraph)
+            ty',
+            Tacticals.then_
+             ~start:
+               (Tactics.change
+                 ~with_cast:true
+                 ~pattern:(None,[id,Cic.Implicit (Some `Hole)],None)
+                 (fun _ metasenv ugraph -> ty,metasenv,ugraph))
+             ~continuation:just
        in
         Tacticals.thens
         ~start:
-          (Tactics.cut ty
+          (Tactics.cut ty'
             ~mk_fresh_name_callback:(fun _ _ _  ~typ -> Cic.Name id))
-        ~continuations:[ continuation ; just ]
+        ~continuations:[ Tacticals.id_tac ; continuation ]
 ;;
 
 let bydone ~dbd ~universe t =
@@ -165,7 +171,7 @@ let rewritingstep ~dbd ~universe lhs rhs just last_step =
   in
   let ty,_ =
    CicTypeChecker.type_of_aux' metasenv context rhs CicUniv.empty_ugraph in
-  let just =
+  let just' =
    match just with
       `Auto params ->
         let params =
@@ -184,7 +190,17 @@ let rewritingstep ~dbd ~universe lhs rhs just last_step =
           Tacticals.first
            [Tactics.auto ~dbd ~params ~universe ;
             Tactics.auto ~dbd ~params:params' ~universe]
-    | `Term just -> Tactics.apply just 
+    | `Term just -> 
+         let ty,_ =
+           CicTypeChecker.type_of_aux' metasenv context just
+             CicUniv.empty_ugraph         
+         in
+          Tactics.solve_rewrite 
+              ~universe:(Universe.index Universe.empty 
+                 (Universe.key ty) just) ~steps:1 ()
+         (* Tactics.apply just *)
+    | `Proof ->
+        Tacticals.id_tac
   in
    let plhs,prhs,prepare =
     match lhs with
@@ -230,8 +246,9 @@ let rewritingstep ~dbd ~universe lhs rhs just last_step =
                 ~continuations:[Tacticals.id_tac ; continuation]) (proof,goal)
             in
              let goals =
-              match goals with
-                 [g1;g2] -> [g2;newmeta;g1]
+              match just,goals with
+                 `Proof, [g1;g2;g3] -> [g2;g3;newmeta;g1]
+               | _, [g1;g2] -> [g2;newmeta;g1]
                | _ -> assert false
              in
               proof,goals)
@@ -239,11 +256,11 @@ let rewritingstep ~dbd ~universe lhs rhs just last_step =
     let continuation =
      if last_step then
       (*CSC:manca controllo sul fatto che rhs sia convertibile con prhs*)
-      just
+      just'
      else
       Tacticals.thens
        ~start:(Tactics.apply ~term:(Cic.Appl [trans;ty;plhs;rhs;prhs]))
-       ~continuations:[just ; Tacticals.id_tac]
+       ~continuations:[just' ; Tacticals.id_tac]
     in
      prepare continuation
  in
@@ -257,7 +274,7 @@ let we_proceed_by_cases_on t pat =
 
 let we_proceed_by_induction_on t pat =
  let pattern = None, [], Some pat in
- Tactics.elim_intros ~depth:0 ~pattern t
+ Tactics.elim_intros ~depth:0 (*~pattern*) t
 ;;
 
 let case id ~params =