A few other tactics made available to matita.

[helm.git] / helm / ocaml / tactics / ring.ml

diff --git a/helm/ocaml/tactics/ring.ml b/helm/ocaml/tactics/ring.ml
index cebb4cf91b35416d73a637cbf73a7aabb5861136..ab7bde56f8dfa4049ca0989ccb55e64d3ac7eada 100644 (file)
--- a/helm/ocaml/tactics/ring.ml
+++ b/helm/ocaml/tactics/ring.ml
@@ -437,9 +437,15 @@ let purge_hyps_tac ~count =
     match (n, context) with
     | (0, _) -> status
     | (n, hd::tl) ->
-        aux (n-1) tl
-         (status_of_single_goal_tactic_result 
-         (ProofEngineTypes.apply_tactic (S.clear ~hyp:hd) status))
+        let name_of_hyp =
+         match hd with
+            None
+          | Some (Cic.Anonymous,_) -> assert false
+          | Some (Cic.Name name,_) -> name
+        in
+         aux (n-1) tl
+          (status_of_single_goal_tactic_result 
+          (ProofEngineTypes.apply_tactic (S.clear ~hyp:name_of_hyp) status))
     | (_, []) -> failwith "Ring.purge_hyps_tac: no hypotheses left"
   in
    let (_, metasenv, _, _) = proof in