diff -r abf9d5e2fb6e -r 5d1eafaff50c src/Pure/Isar/isar_cmd.ML
--- a/src/Pure/Isar/isar_cmd.ML	Fri Jul 16 22:22:59 1999 +0200
+++ b/src/Pure/Isar/isar_cmd.ML	Fri Jul 16 22:23:26 1999 +0200
@@ -7,7 +7,6 @@
 
 signature ISAR_CMD =
 sig
-  val break: Toplevel.transition -> Toplevel.transition
   val exit: Toplevel.transition -> Toplevel.transition
   val restart: Toplevel.transition -> Toplevel.transition
   val quit: Toplevel.transition -> Toplevel.transition
@@ -47,8 +46,6 @@
 
 (* variations on exit *)
 
-val break = Toplevel.keep (fn state => raise Toplevel.BREAK state);
-
 val exit = Toplevel.keep (fn state =>
   (Context.set_context (try Toplevel.theory_of state);
     writeln "Leaving the Isar loop.  Invoke 'loop();' to restart.";