QRationals.hs:63:12: Warning: No explicit method nor default method for `toEnum' In the instance declaration for `Enum QRational' QRationals.hs:63:12: Warning: No explicit method nor default method for `fromEnum' In the instance declaration for `Enum QRational' RealReals.hs:58:11: Warning: No explicit method nor default method for `toEnum' In the instance declaration for `Enum RealReal' RealReals.hs:58:11: Warning: No explicit method nor default method for `fromEnum' In the instance declaration for `Enum RealReal'