[Haskell] newbie question: variable not in scope: "isSpace"

[Tom Pledger]

A.J. Bonnema wrote:

> If I use isSpace from the hugs interpretor, it works.
>
> If I use isSpace from a test.hs file I get the error message:
> Undefined variable "isSpace"
>
> From ghc I get the error message:
> Variable not in scope: "isSpace"
>
> What is wrong? 


Hugs automatically imports a few extra things as well as the standard 
prelude. Try adding the line

    import Data.Char

to your module.