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'
11 Illegal instance declaration for `Eq (a -> a)'
12 (the instance type must be of form (T a b c)
13 where T is not a synonym, and a,b,c are distinct type variables)
16 Illegal instance declaration for `Num (a -> a)'
17 (the instance type must be of form (T a b c)
18 where T is not a synonym, and a,b,c are distinct type variables)
20 Compilation had errors