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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