src/HOL/Tools/try0.ML

--- a/src/HOL/Tools/try0.ML	Wed May 15 17:39:41 2013 +0200
+++ b/src/HOL/Tools/try0.ML	Wed May 15 20:22:46 2013 +0200
@@ -27,8 +27,8 @@
 val auto = Unsynchronized.ref false
 
 val _ =
-  ProofGeneral.add_preference Preferences.category_tracing
-      (Preferences.bool_pref auto "auto-try0" "Try standard proof methods.")
+  ProofGeneral.preference_bool ProofGeneral.category_tracing
+    auto "auto-try0" "Try standard proof methods"
 
 val default_timeout = seconds 5.0