No. A solution for this (depending on the type class you want to derive) is 
Generic Programming. Using Generic Programming, you can define functions that 
work on the structure of the type.

For example, take a look at the regular package [1]. It provides all the 
functionality to write your own generic functions.

-chris

[1]: http://hackage.haskell.org/package/regular

On 23 mrt 2010, at 11:52, Ozgur Akgun wrote:

> Can a user define a derivable type class of her own? If yes, how?
> 
> Cheers,
> 
> -- 
> Ozgur Akgun
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
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