[Haskell-cafe] adding the elements of two lists

[Jerzy Karczmarczuk]

TP  :
> However, it seems it is not possible to do that:
>
> -------------------
> instance Num [Int] where
> 	l1 + l2 = ....
> -------------------
>
> Why?
Why not?? It is possible.

All what has been said by other people is right.
But you can do it your way as well, GHC won't protest if you :set 
-XFlexibleInstances .

(Then you might have some other "small" problems, but nobody is perfect).


Jerzy Karczmarczuk