FWIW, ObjectiveC solves this by making literals special subclasses of  
NSString because they reference data compiled into the static data  
segment of the executable.  Also NSString's are immutable, subclasses  
NSMutableString are mutable.  So modification of literals doesn't  
come up as it produces a DNU type error.

-Todd Blanchard

On Feb 25, 2007, at 2:26 AM, Klaus D. Witzel wrote:

> Hi Damien,
>
> on Sat, 24 Feb 2007 23:29:18 +0100, you wrote:
>> Ok, I may not use the right word. What comment would you write ?
>
> I cannot write you that comment. Smalltalk was built with a minimum  
> set of unchangeable parts, see "Design Principles Behind Smalltalk"  
> just the sentence after "Good Design"
>
> - http://users.ipa.net/~dwighth/smalltalk/byte_aug81/ 
> design_principles_behind_smalltalk.html
>
> Moreover, the design principle does not say minimal, it says minimum.
>
> It turned out the only unchangeable parts are instances of  
> SmallInteger (they are their own oop).
>
> Every object (but the SmallIntegers) can be changed and I disagree  
> with your blaming of the compiler and streams.
>
> /Klaus
>
>> 2007/2/24, Klaus D. Witzel <klaus.witzel at cobss.com>:
>>> Hi Damien,
>>>
>>> I still think that something is not correct with your analysis.  
>>> In you
>>> comments you write:
>>>
>>>         "Current compiler uses only one variable for both  
>>> strings. I think this
>>> is a bug."
>>>
>>> But you do not code a variable, instead you code *literals*  
>>> which, as was
>>> mentioned earlier, are also not a constant.
>>>
>>> ?
>>>
>>> /Klaus
>>>
>>> On Sat, 24 Feb 2007 19:14:52 +0100, Damien Cassou wrote:
>>>
>>> > I've written unit tests for this compiler "optimizations". I think
>>> > they show a bug. See attached file.
>>> >
>>>
>>>
>>>
>>>
>>
>>
>
>
>