Stupid bug of mine fixed: sometimes (Some ~-1) was used in place of None.

[helm.git] / helm / matita / matita.ml

diff --git a/helm/matita/matita.ml b/helm/matita/matita.ml
index 69b14b8190b8ab90d076120aab94da41b4147ed6..016d69336313f372ed419b3a720b09580f54cc7d 100644 (file)
--- a/helm/matita/matita.ml
+++ b/helm/matita/matita.ml
@@ -81,15 +81,15 @@ let _ =
     match grafite_status.proof_status with
     | Incomplete_proof ({ stack = stack } as incomplete_proof) ->
         sequents_viewer#load_sequents incomplete_proof;
-        let goal =
-         match script#goal with
-            None -> assert false
-          | Some n -> n
-        in
         (try
-          script#setGoal (Continuationals.Stack.find_goal stack);
-          sequents_viewer#goto_sequent goal
-        with Failure _ -> script#setGoal ~-1);
+          script#setGoal (Some (Continuationals.Stack.find_goal stack));
+          let goal =
+           match script#goal with
+              None -> assert false
+            | Some n -> n
+          in
+           sequents_viewer#goto_sequent goal
+        with Failure _ -> script#setGoal None);
     | Proof proof -> sequents_viewer#load_logo_with_qed
     | No_proof -> sequents_viewer#load_logo
     | Intermediate _ -> assert false (* only the engine may be in this state *)