Initialize variables for ruby -w

Author: drbrain

lib/rdoc/markup/verbatim.rb

@@ -49,6 +49,7 @@ def normalize
   # Is this verbatim section ruby code?
 
   def ruby?
+    @format ||= nil # TODO for older ri data, switch the tree to marshal_dump
     @format == :ruby
   end
 

lib/rdoc/rdoc.rb

@@ -26,6 +26,8 @@
 
 class RDoc::RDoc
 
+  @current = nil
+
   ##
   # This is the list of supported output generators