Andreas Raab uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-ar.197.mcz

==================== Summary ====================

Name: System-ar.197
Author: ar
Time: 12 December 2009, 5:45:48 am
UUID: 17e771ac-17db-ba41-bc2f-6c2733d517ab
Ancestors: System-ul.196

Touch MethodReference>>category to make very sure it shows in the System package.

=============== Diff against System-ul.196 ===============

Item was changed:
  ----- Method: MethodReference>>category (in category 'queries') -----
  category
+ 	"Answers the class category (cached for reuse via MC and other tools)"
  	^ category ifNil: [category := self actualClass organization categoryOfElement: methodSymbol]!