Using the Obj module you can do affectation of cons cell of a list (or 
any onther data type), which is usefull for instance to write a tail 
recursive Map funtion ... (see a previous thread)

But this is not typesafe !

Why not allow a typesafe way to mute immutable data (sum, products, 
immutable records and so on) ?

---

By the way, another step would be to infer for each function if it mutes 
its arguments instead of annoting record with "mutable" indication.

This is better because the same data may be considered as mutable by 
some functions (for instance when you construct the data) but then be 
used only by immutable functions and this way the type inference can 
help you insure that you do not mute the data anymore.

But this is research topic ?


-- 
Christophe Raffalli
Université de Savoie
Batiment Le Chablais, bureau 21
73376 Le Bourget-du-Lac Cedex

tél: (33) 4 79 75 81 03
fax: (33) 4 79 75 87 42
mail: Christophe.Raffalli@univ-savoie.fr
www: http://www.lama.univ-savoie.fr/~RAFFALLI
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