[XeTeX] Any progress on 16 open write file limit?

[Bruno Le Floch]

> I tried it with \usepackage{index} (see below and attachments), but I
> get the error
>   ! Undefined control sequence.
> <recently read> \tl_replace_in:Nnn
>
> Any recommendations of what I should do?

Update the l3kernel bundle to the newest version via your package
manager (or directly from CTAN. It's sort of mentionned in the doc of
morewrites (but I really should've added an explicit test in the
package, sorry).

Hope this helps,
-- 
Bruno Le Floch