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
>
>
