Bert Freudenberg uploaded a new version of Collections to project The Trunk:
http://source.squeak.org/trunk/Collections-bf.615.mcz==================== Summary ====================
Name: Collections-bf.615
Author: bf
Time: 10 April 2015, 5:46:52.241 pm
UUID: 081c8444-1766-451d-baa2-311e9f0d9374
Ancestors: Collections-bf.614
Restore WeakArray>>species. It's apparently not the culprit for the obsolete class refs.
=============== Diff against Collections-bf.614 ===============
Item was changed:
----- Method: WeakArray>>species (in category 'private') -----
species
"More useful to have strongly-referenced results of #select: and #collect:."
+ ^ Array!
- ^super species "disabled temporarily to see if this fixes testNoObsoleteClasses on the build server"
- "^ Array"!