diff -r 6061ae1f90f2 -r 9bc16273c2d4 src/FOL/ex/If.thy
--- a/src/FOL/ex/If.thy	Fri Jun 17 11:35:35 2005 +0200
+++ b/src/FOL/ex/If.thy	Fri Jun 17 16:12:49 2005 +0200
@@ -6,7 +6,7 @@
 
 header {* First-Order Logic: the 'if' example *}
 
-theory If = FOL:
+theory If imports FOL begin
 
 constdefs
   if :: "[o,o,o]=>o"