[Haskell-cafe] Query regarding Type classes

[Andrew Coppin]

Arun Suresh wrote:
> Hello folks,
>
> Im kinda new to haskell. Ive only been fiddling around with it for 
> bout 3 - 4 weeks now.
> And for the life of me... i cant seem to figure out why this doesnt work :
>
>
> class Foo a where
>     fooFunc :: a -> Int
>
> data FooData = FData
>
> instance Foo FooData where
>     fooFunc _ = 10
>
>
>
> class Bar a where
>     barFunc :: (Foo b) => a -> b -> Int
>
> data BarData = BData
>
> instance Bar BarData where
>     barFunc _ FData = 20

Ooo, ooo, I know this one, it's... oh, wait, I've been at work all day, 
so by now 30 other people have already replied. Heh. I need to find 
another day job... ;-)