Effective Haskell: Type Classes Ordering

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Hi Rebecca,

On page 220 you implement a typeclass for ordering and then you show an example of usage with Int type, eg. compare (1 :: Int) (0 :: Int) - this example fails for me. However, using Word8 works for it seems.

This is the error I get when using Int type:

λ: compare (1 :: Int) (0 :: Int)

<interactive>:20:1: error:
    • No instance for (Ord Int) arising from a use of ‘compare’
    • In the expression: compare (1 :: Int) (0 :: Int)
      In an equation for ‘it’: it = compare (1 :: Int) (0 :: Int)