3 The constraint `Eq a' does not mention any of
4 the universally quantified type variables {}
5 of the type `Int -> Int'
6 In the type signature for `f'
10 mentions type variables that do not appear in the type
12 In the type signature for `f'
15 The constraint `Eq a' does not mention any of
16 the universally quantified type variables {}
18 In the type signature for `op'
21 The constraint `Eq a' does not mention any of
22 the universally quantified type variables {}
24 In the type signature for an instance decl
28 mentions type variables that do not appear in the type
30 In the type signature for an instance decl
33 Compilation had errors