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tcfail044.hs:6:20: error:
    • Illegal instance declaration for ‘Eq (a -> a)’
        (All instance types must be of the form (T a1 ... an)
         where a1 ... an are *distinct type variables*,
         and each type variable appears at most once in the instance head.
         Use FlexibleInstances if you want to disable this.)
    • In the instance declaration for ‘Eq (a -> a)’

tcfail044.hs:9:21: error:
    • Illegal instance declaration for ‘Num (a -> a)’
        (All instance types must be of the form (T a1 ... an)
         where a1 ... an are *distinct type variables*,
         and each type variable appears at most once in the instance head.
         Use FlexibleInstances if you want to disable this.)
    • In the instance declaration for ‘Num (a -> a)’