[Haskell-cafe] newbie type signature question

[Brock Peabody]

> Brian Hulley wrote:

> There was a post a while back (unfortunately I can't seem to locate
it)
> where someone posted a link to some guidelines on haskell coding style
> where
> one guideline was never to use contexts in data declarations.

I would love to see that guideline.  What is the correct way to express
a constraint for a data declaration if this way is wrong?

Thanks,

Brock