Re: [Haskell] Haskell 98 syntax question

Sascha Böhme wrote:

Hello,

referring to the Haskell 98 report as available in the Internet, I have a short question. Section 4.1.3 (Syntax of Class Assertions and Contexts) contains the rule:

class -> qtycls tyvar | qtycls ( tyvar atype1 ... atypen ) (n>=1)

Is there a (simple) practical example of a Haskell type expression using the second line of the above rule?

If you read a little bit further, you'll find the type (Eq (f a), Functor f) => (a -> b) -> f a -> f b -> Bool in Sect 4.1.4. Another example can be found in Sect. 4.5.3: f :: (Monad m, Eq (m a)) => a -> m a -> Bool f x y = return x == y Regards Wolfgang