Hello Jeff, Friday, December 23, 2005, 1:52:02 AM, you wrote: JHhc> {- JHhc> This code is works with Glasgow, ghci, with these options: JHhc> -fglasgow-exts JHhc> -fallow-undecidable-instances JHhc> -fno-monomorphism-restriction JHhc> -fallow-incoherent-instances JHhc> -} :) replace it with: {-# OPTIONS -fglasgow-exts -fallow-undecidable-instances -fno-monomorphism-restriction -fallow-incoherent-instances #-} and the compiler will set this options automatically. btw, why you need to disable the monomorphism restriction? JHhc> v1 = Vector [1,2,3] JHhc> v2 = Vector [10,15,2] use instead: vector :: [Double] -> Vector Double vector = Vector v1 = vector [1,2,3] v2 = vector [10,15,2] -- Best regards, Bulat mailto:bulatz@HotPOP.com