[plt-scheme] Better error msg for contract?

On 3/9/07, Robby Findler <robby.findler at gmail.com> wrote:
> Yeah, that's a bug. Its fixed in SVN, now. Here's the current message
> for that program:
>
> /Users/robby/tmp.ss:3:15: struct/c: expected 2 contracts because
> struct xpto has 2 fields in: (do-struct/c xpto integer?)
>

Great! Thank you! :-)

> Thanks.
>
> Robby
>
> On 3/9/07, Paulo J. Matos <pocm at soton.ac.uk> wrote:
> > Hello all,
> >
> > I'm just curious if one can get a better error message for:
> > (require (lib "contract.ss"))
> >
> > (define-struct xpto (foo bar))
> > (define xpto/c (struct/c xpto integer?))
> >
> > I get:
> > syntax: incompatible ellipsis match counts for template in: ...
> >
> > Which is unfortunately not very informative. Quite easy to find out
> > the missing struct/c argument (contract for one field) in this case
> > but not so easy in larger program.
> > I had a lot of code and a struct to which I added a field (among other
> > code changes). Then I get this error. Problem was I forgot to add the
> > contract for the structure field (simple!) but in a huge program it
> > took me 10 min to find the problem.
> >
> > Cheers,
> > --
> > Paulo Jorge Matos - pocm at soton.ac.uk
> > http://www.personal.soton.ac.uk/pocm
> > PhD Student @ ECS
> > University of Southampton, UK
> > _________________________________________________
> >   For list-related administrative tasks:
> >   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> >
>
>
>


-- 
Paulo Jorge Matos - pocm at soton.ac.uk
http://www.personal.soton.ac.uk/pocm
PhD Student @ ECS
University of Southampton, UK