X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Ftactics%2FproofEngineStructuralRules.ml;h=8995fbbeb8443ebed4cac5fd963b4b304483c7a7;hb=4167cea65ca58897d1a3dbb81ff95de5074700cc;hp=2c641fd84f9ee3e48d625951bc970d35a61ed4e2;hpb=8b55faddb06e3c4b0a13839210bb49170939b33e;p=helm.git

diff --git a/helm/ocaml/tactics/proofEngineStructuralRules.ml b/helm/ocaml/tactics/proofEngineStructuralRules.ml
index 2c641fd84..8995fbbeb 100644
--- a/helm/ocaml/tactics/proofEngineStructuralRules.ml
+++ b/helm/ocaml/tactics/proofEngineStructuralRules.ml
@@ -118,8 +118,8 @@ let clear ~hyp =
                     Some (Cic.Name hyp',_) when hyp' = hyp -> 
                       (true, None::context)
                   | None -> (b, None::context)
-                  | Some (_,Cic.Def (_,Some _)) -> assert false
                   | Some (n,C.Decl t)
+                  | Some (n,Cic.Def (t,Some _))
                   | Some (n,C.Def (t,None)) ->
                       if b then
                          let _,_ =
@@ -154,6 +154,35 @@ let clear ~hyp =
  in
   mk_tactic (clear ~hyp)
 
+(* Warning: this tactic has no effect on the proof term.
+   It just changes the name of an hypothesis in the current sequent *)
+let rename ~from ~to_ =
+ let rename ~from ~to_ (proof, goal) =
+  let module C = Cic in
+   let curi,metasenv,pbo,pty = proof in
+    let metano,context,ty =
+     CicUtil.lookup_meta goal metasenv
+    in
+     let metasenv' =
+      List.map
+       (function
+           (m,canonical_context,ty) when m = metano ->
+             let canonical_context' =
+              List.map
+               (function
+                   Some (Cic.Name hyp,decl_or_def) when hyp = from ->
+                    Some (Cic.Name to_,decl_or_def)
+                 | item -> item
+               ) canonical_context
+             in
+              m,canonical_context',ty
+         | t -> t
+       ) metasenv
+     in
+      (curi,metasenv',pbo,pty), [goal]
+ in
+  mk_tactic (rename ~from ~to_)
+
 let set_goal n =
   ProofEngineTypes.mk_tactic
     (fun (proof, goal) ->