A new version of Collections was added to project The Inbox: http://source.squeak.org/inbox/Collections-nice.423.mcz
==================== Summary ====================
Name: Collections-nice.423 Author: nice Time: 30 September 2011, 10:12:20.333 pm UUID: 7613573f-6d08-9d4c-9d9e-2eaacff799fe Ancestors: Collections-ul.422
#size and #do: default implementation will cause an infinite loop in every new subclass of SequenceableCollection without any form of warning to the poor programmer.
It's simple to avoid this bad behavior by: - moving Collection>>size implementation to the sole place where it is used (LinkedList) - replacing it with a subclassResponsibility.
=============== Diff against Collections-ul.422 ===============
Item was changed: ----- Method: Collection>>size (in category 'accessing') ----- size "Answer how many elements the receiver contains."
+ ^self subclassResponsibility! - | tally | - tally := 0. - self do: [:each | tally := tally + 1]. - ^ tally!
Item was added: + ----- Method: LinkedList>>size (in category 'accessing') ----- + size + "Answer how many elements the receiver contains." + + | tally | + tally := 0. + self do: [:each | tally := tally + 1]. + ^ tally!