X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Ftactics%2Fring.ml;h=ab7bde56f8dfa4049ca0989ccb55e64d3ac7eada;hb=7b78ae643999aa95b95b376fab54adb33dbed206;hp=4691239f411eb78362ce68dc29e839450675c6e2;hpb=31851952e1cc2db59168c5fd6f6093d9bc37ea86;p=helm.git

diff --git a/helm/ocaml/tactics/ring.ml b/helm/ocaml/tactics/ring.ml
index 4691239f4..ab7bde56f 100644
--- a/helm/ocaml/tactics/ring.ml
+++ b/helm/ocaml/tactics/ring.ml
@@ -34,11 +34,12 @@ open HelmLibraryObjects
 
   (** perform debugging output? *)
 let debug = false
+let debug_print = fun _ -> ()
 
   (** debugging print *)
 let warn s =
   if debug then
-    prerr_endline ("RING WARNING: " ^ s)
+    debug_print ("RING WARNING: " ^ s)
 
 (** CIC URIS *)
 
@@ -436,9 +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