diff -r 4e4b8c0dc766 -r e1ef6b441fe7 src/Pure/Isar/toplevel.ML
--- a/src/Pure/Isar/toplevel.ML	Tue Jul 20 20:10:27 2010 +0200
+++ b/src/Pure/Isar/toplevel.ML	Tue Jul 20 20:56:28 2010 +0200
@@ -24,6 +24,7 @@
   val enter_proof_body: state -> Proof.state
   val print_state_context: state -> unit
   val print_state: bool -> state -> unit
+  val pretty_abstract: state -> Pretty.T
   val quiet: bool Unsynchronized.ref
   val debug: bool Unsynchronized.ref
   val interact: bool Unsynchronized.ref
@@ -212,6 +213,8 @@
   | SOME (SkipProof (d, _)) => [Pretty.str ("skipped proof: depth " ^ string_of_int d)])
   |> Pretty.markup_chunks Markup.state |> Pretty.writeln;
 
+fun pretty_abstract state = Pretty.str ("<Isar " ^ str_of_state state ^ ">");
+
 
 
 (** toplevel transitions **)