> Thanks a lot. I don't know what went wrong with my saving to the
> repository, sorry.
>
> It looks like visitNumberDescription: will raise an error on negative numbers:
>
>   self contents allSatisfy: [ :each | '0123456789.' includes: each ]
>
> maybe something like this? :
>
>   (self contents allButFirst allSatisfy: [ :each | '0123456789.'
> includes: each ] )
>      and:['-0123456789.' includes self contents first]

Indeed, good catch. I will fix this as soon as possible, unless you
commit your change ;-)

Cheers,
Lukas

-- 
Lukas Renggli
http://www.lukas-renggli.ch