[Haskell-beginners] Named fields in data types

[Edward Z. Yang]

Excerpts from legajid's message of Wed Nov 18 15:11:01 -0500 2009:
> I've tried these lines :
> contact01 = Adresse "Didier" 51100 "Reims"
> contact02 = Adresse {nom="Laure", cp=0}
> contact02 = contact02 { ville="Nogent" }
> 
> but i get an error : multiple declarations of Main.contact02
> So, does it mean i can't add values to contact02. Instead, i must create 
> a contact03 based on contact02 ?

Yep; part of the point behind a pure functional language is to not
allow mutation by default.

Cheers,
Edward