Haskell: comparing NaN values

Question

I wrote quickcheck tests for a Haskell program that optimizes and evaluates a function.

The problem is quickcheck generates expressions resulting in NaN lik

Answer 1

No, as is defined by IEEE 754 comparing 2 NaNs always return false. To chceck if your value is NaN in Haskell you can use isNaN method or write it by yourself

isNaN' :: a -> Bool
isNaN' a = a /= a