So first: as Sven said Sequenceable collection is abstract. Still I would consider what you found a bug since it provides the implementations that produce the behavior you reported.
I can reproduce it in a 40 with vmLatest, and the proble occurs whenever either #do: or #size is sent. SequenceableCollection>>do: aBlock "Refer to the comment in Collection|do:.” 1 to: self size do: [:index | aBlock value: (self at: index)] Collection>>size size "Answer how many elements the receiver contains.” | tally | tally := 0. self do: [:each | tally := tally + 1]. ^ tally As you can see, calling either method will produce an infinite loop which eventually crashes the VM. I couldn’t find an open bug entry so I’ve created one: https://pharo.fogbugz.com/f/cases/14022/Infinite-loop-in-simple-subclasses-of-SequenceableCollection Cheers, Max On 15.09.2014, at 23:12, jdelg...@lsi.upc.edu wrote: > Hi, > > A student of mine has accidentaly found something interesting that may be > already reported, but I do not have time to check. > > The thing is simple: > > 1) Create a class with accessors for f. > > SequenceableCollection subclass: #Foo > instanceVariableNames: 'f' > classVariableNames: '' > category: 'Varios' > > 2) Foo class >> new: d > ^self new f: (Array new: d*d) > > 3) Go to Workspace and inspect the following code > > | m | > m := Foo new: 2 > > And Pharo crashes. Always crashes. I am using "Pharo 3.0 3" on OS X 10.6.8. I > am pretty sure it is not a Smalltalk error since it works ok in Squeak and > VisualWorks. > > So, is this a known issue? > > Bests, > > Jordi > >