diff -r 6061ae1f90f2 -r 9bc16273c2d4 src/HOL/Unix/Unix.thy
--- a/src/HOL/Unix/Unix.thy	Fri Jun 17 11:35:35 2005 +0200
+++ b/src/HOL/Unix/Unix.thy	Fri Jun 17 16:12:49 2005 +0200
@@ -5,7 +5,7 @@
 
 header {* Unix file-systems \label{sec:unix-file-system} *}
 
-theory Unix = Nested_Environment + List_Prefix:
+theory Unix imports Nested_Environment List_Prefix begin
 
 text {*
   We give a simple mathematical model of the basic structures