diff -r 7f8d88ed4f21 -r 739eba13e2cd src/Pure/Thy/present.ML
--- a/src/Pure/Thy/present.ML	Fri Nov 09 00:18:23 2001 +0100
+++ b/src/Pure/Thy/present.ML	Fri Nov 09 00:19:20 2001 +0100
@@ -78,6 +78,7 @@
 
   val empty = {name = "Pure", session = [], is_local = false};
   val copy = I;
+  val finish = I;
   fun prep_ext _ = {name = "", session = [], is_local = false};
   fun merge _ = empty;
   fun print _ _ = ();