diff -r 6061ae1f90f2 -r 9bc16273c2d4 doc-src/TutorialI/Misc/Tree2.thy
--- a/doc-src/TutorialI/Misc/Tree2.thy	Fri Jun 17 11:35:35 2005 +0200
+++ b/doc-src/TutorialI/Misc/Tree2.thy	Fri Jun 17 16:12:49 2005 +0200
@@ -1,5 +1,5 @@
 (*<*)
-theory Tree2 = Tree:
+theory Tree2 imports Tree begin
 (*>*)
 
 text{*\noindent In Exercise~\ref{ex:Tree} we defined a function