A correct observation but anyone for whom this matters understands (or 
will learn very quickly) that #allInstances is a utility method that 
cannot possibly give the correct answer in all situations. You have 
found one, but there are others (hint: think about method activation).

The only true way to find all instances of some class is to do it 
yourself at the place where you need it, like here:

   obj := aClass someInstance.
   [obj == nil] whileFalse:[obj := obj nextObject].

Cheers,
   - Andreas

Mathieu wrote:
> Hi,
> 
> I was thinking about what happen if we do:
> 
> Array allInstances
> 
> Beceause #allInstances return an Array but this array are not include in himself.
> So #allInstances don't really return all instances?
> 
> So after I have investigated allInstances and have discovered that the array was created at the end
> of the method. But an other question come out.
> 
> I have saw in the object return by 'Array allInstances' that at the end many array look like the one
> return by 'Array allInstances'.
> 
> Hope you follow up to now. :)
> 
> So I was wondering why. And I have look the implementation of OrderedCollection and saw that it use
> Array to store the elements.
> 
> So If we don't want the element create during the execution of allInstances, the one inside the
> OrderedCollection shouldn't appear?
> 
> 
> 	| all |
> 	all _ OrderedCollection new.
> 	self allInstancesDo: [:x | x == all ifFalse: [all add: x]].
> 	^ all asArray
> 
> 
> "x == all" it's not enough. It should be something like :
> 
> "all allDeepInstVar includes: x" (#allDeepInstVar dose not exist)
> 
> I know that may not be very important but what do you think?
> 
> Math
> 
> 
> 
>