On 2013–04–17 "H. Özoguz" wrote:

> With \at[ref] one can get the pagenumber of a reference. If this
> reference is not there (maybe in another file, not included at that
> moment) there is no error given, but two question marks ??.
> That is of course useful, but what if I WANT an error? Because that
> is the only fast way to detect typing errors in references.

ConTeXt requires multiple passes to get the references right, which
means the first run would always fail if missing references trigger
an error and should be delayed to the second run. Seems possible,
though.

I use the following command to detect wrong references. It's not
pretty, but it does it's job reasonably well.

  pdftotext <file.pdf> - | grep -E '\?\?|!!'

Marco