Thanks Georges

It looks suggestive, but I'm struggling to follow the details of
with-contract / blame-id. An example of use would be very helpful in the
docs!

Have you used this construct?


Dan


On Sun, May 7, 2017 at 7:44 AM, Dupéron Georges <jahvascriptman...@gmail.com
> wrote:

> Le samedi 6 mai 2017 23:38:29 UTC+2, Daniel Prager a écrit :
> > Although I understand why my macro does this
> >
> > unsafe-factorial: contract violation
> > ...
> >   blaming: (function fn/impl)
> > ...
> >   at: unsaved-editor:13.15
> >
> >
> > Ideally I would prefer one which blames unsafe-factorial
> >
> > unsafe-factorial: contract violation
> > ...
> >   blaming: (function unsafe-factorial)
> > ...
> >   at: unsaved-editor:13.15
> >
> >
> > i.e. it's leaking an auxillary introduced by the macro (fn/impl) into the
> > message & Dr Racket. It seems that the line-number refers to the line
> that
> > defines unsafe-factorial, though, which looks right.
>
> Perhaps with-contract's `blame-id` can help?
>
> http://docs.racket-lang.org/reference/attaching-contracts-
> to-values.html#%28form._%28%28lib._racket%2Fcontract%
> 2Fregion..rkt%29._with-contract%29%29

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