Hello. While porting Haskore to NHC98 I got an error I am not understanding. I have attached a test module that shows the error message: $ nhc98 -c Test.hs ==================================== Error after type deriving/checking: No default for Monad.MonadPlus at 7:1.(171,[(2,209)]) No default for Monad.MonadPlus at 6:1.(174,[(2,208)]) GHC 4.08.1 and Hugs98 accepts the code without complaining. Any hints? Romildo -- Prof. José Romildo Malaquias <romildo@iceb.ufop.br> Departamento de Computação Universidade Federal de Ouro Preto Brasil