--- 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