> + \ifx\indexsortkey\empty
> + \message{Empty index sort key near line \the\inputlineno}%
> + \xdef\indexsortkey{ }%
> + \fi
>
> Do you think this would help fix this kind of problem?
Yes, thanks. Maybe it makes sense to also emit
Are you trying to index a backslash while
`@set txiindexbackslashignore` is active?
This could be generalized to catch the other `txi*ignore` flags, too.
Werner
