src/HOL/Library/While_Combinator.thy

--- a/src/HOL/Library/While_Combinator.thy	Mon Aug 16 14:21:54 2004 +0200
+++ b/src/HOL/Library/While_Combinator.thy	Mon Aug 16 14:22:27 2004 +0200
@@ -6,7 +6,9 @@
 
 header {* A general ``while'' combinator *}
 
-theory While_Combinator = Main:
+theory While_Combinator
+import Main
+begin
 
 text {*
  We define a while-combinator @{term while} and prove: (a) an