Well, since SequenceableCollection overwrites #do: breaking its superclass' contract, it should also overwrite #size as subclassResponsibility - at least. That would break the loop, no ?
The discussion about catching infinite recursion loops is old and comes up every couple of weeks. It should be fixed, it can be fixed IMHO, but it is a VM thing. On 16 Sep 2014, at 08:39, Max Leske <[email protected]> wrote: > 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, [email protected] 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 >> >> >
