Dear Professor Hans Aberg: Thank you for your answer! 'Sorry to bother you again... I found a Hugs manual, "The Hugs 98 User Manual", and it describes "module". So, I wrote: module Fact where fact :: Integer -> Integer fact n = product [1..n] because this is the example showed at page 8 of that manual. But, unfortunately, another error message appears: "cannot find module 'Fact' ". I understood, from your e-mail and the manual, that I must create an ".hs" file with my own definitions; so, how can I do this? Thank you very much (again!). Best regards, Pedro. ----- Original Message ----- From: Hans Aberg <haberg@matematik.su.se> To: Pedro L. P. Dias <pedrolpd@uol.com.br> Cc: <hugs-bugs@haskell.org> Sent: Thursday, July 25, 2002 1:36 PM Subject: Re: Problems...

At 10:31 -0300 2002/07/25, Pedro L. P. Dias wrote: I start Hugs, and, at the line command "prelude>", when I digit, for example, "add x y = x + y", an error message appear: "...unexpected '='". Also, when I digit (other example) "inc n = n + 1", the error message is "undefined variable inc",

Dig-it, Hugs is hooked up so that definitions must be in a file. So put the stuff in a file and then load that file.

Hans Aberg