Hello hugs-users, i found a difference between GHC and Hugs behaviour, that seems like the small bug on the Hugs part. It needs at least 3 modules to reproduce :) and i included them all. try to execute c.hs by hugs and ghc and see the difference. the problem disappears when the whole class exported in a.hs -- Best regards, Bulat mailto:bulatz@HotPOP.com