Warning: No explicit method nor default method for `abs'
in an instance declaration for `Num'
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tcfail044.hs:5:
Illegal instance declaration for `Eq (a -> a)'
(the instance type must be of form (T a b c)
(the instance type must be of form (T a b c)
where T is not a synonym, and a,b,c are distinct type variables)
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Compilation had errors