implicit checkpoint in Local_Theory.theory as well -- no longer export Local_Theory.checkpoint;

--- a/src/HOL/Tools/Predicate_Compile/predicate_compile.ML	Sun Mar 28 17:43:09 2010 +0200
+++ b/src/HOL/Tools/Predicate_Compile/predicate_compile.ML	Sun Mar 28 19:20:52 2010 +0200
@@ -170,7 +170,6 @@
     if (is_inductify options) then
       let
         val lthy' = Local_Theory.theory (preprocess options t) lthy
-          |> Local_Theory.checkpoint
         val const =
           case Predicate_Compile_Fun.pred_of_function (ProofContext.theory_of lthy') const of
             SOME c => c

--- a/src/HOL/Tools/Predicate_Compile/predicate_compile_core.ML	Sun Mar 28 17:43:09 2010 +0200
+++ b/src/HOL/Tools/Predicate_Compile/predicate_compile_core.ML	Sun Mar 28 19:20:52 2010 +0200
@@ -2912,7 +2912,6 @@
     val const = prep_const thy raw_const
     val lthy' = Local_Theory.theory (PredData.map
         (extend (fetch_pred_data thy) (depending_preds_of thy) const)) lthy
-      |> Local_Theory.checkpoint
     val thy' = ProofContext.theory_of lthy'
     val preds = Graph.all_succs (PredData.get thy') [const] |> filter_out (has_elim thy')
     fun mk_cases const =

--- a/src/Pure/Isar/local_theory.ML	Sun Mar 28 17:43:09 2010 +0200
+++ b/src/Pure/Isar/local_theory.ML	Sun Mar 28 19:20:52 2010 +0200
@@ -20,7 +20,6 @@
   val target_of: local_theory -> Proof.context
   val raw_theory_result: (theory -> 'a * theory) -> local_theory -> 'a * local_theory
   val raw_theory: (theory -> theory) -> local_theory -> local_theory
-  val checkpoint: local_theory -> local_theory
   val theory_result: (theory -> 'a * theory) -> local_theory -> 'a * local_theory
   val theory: (theory -> theory) -> local_theory -> local_theory
   val target_result: (Proof.context -> 'a * Proof.context) -> local_theory -> 'a * local_theory
@@ -149,7 +148,8 @@
     thy
     |> Sign.map_naming (K (naming_of lthy))
     |> f
-    ||> Sign.restore_naming thy);
+    ||> Sign.restore_naming thy
+    ||> Theory.checkpoint);
 
 fun theory f = #2 o theory_result (f #> pair ());