3 Warning: No explicit method nor default method for `signum'
4 in an instance declaration for `Num'
7 Warning: No explicit method nor default method for `abs'
8 in an instance declaration for `Num'
13 Illegal instance declaration for `Eq (a -> a)'
14 (the instance type must be of form (T a b c)
15 where T is not a synonym, and a,b,c are distinct type variables)
18 Illegal instance declaration for `Num (a -> a)'
19 (the instance type must be of form (T a b c)
20 where T is not a synonym, and a,b,c are distinct type variables)
24 Compilation had errors