BaseDefs.hs:97:9: Warning: No explicit method nor default method for `abs' In the instance declaration for `Num (ExceptionInt a)' BaseDefs.hs:97:9: Warning: No explicit method nor default method for `signum' In the instance declaration for `Num (ExceptionInt a)' BaseDefs.hs:97:9: Warning: No explicit method nor default method for `fromInteger' In the instance declaration for `Num (ExceptionInt a)'