diff -r 552eae49f97d -r e3fdb7c96be5 doc-src/IsarRef/Thy/Symbols.thy
--- a/doc-src/IsarRef/Thy/Symbols.thy	Tue May 03 14:23:40 2011 +0200
+++ b/doc-src/IsarRef/Thy/Symbols.thy	Tue May 03 15:07:36 2011 +0200
@@ -1,5 +1,5 @@
 theory Symbols
-imports Pure
+imports Base Main
 begin
 
 chapter {* Predefined Isabelle symbols \label{app:symbols} *}