Re: [Haskell-beginners] Question about List Type Constraint and Null

The value of `null res' for a given String obviously depends on the type at which res is used. Why does it matter what the type of res is as long as it is some kind of list? Doesn't 'reads' always gives [(a1,String)]? So why does it matter what type 'a1' is?

Thanks for the clear explanation of the monomorphism restriction. -deech