[pstricks] pstricks-add fails basic test after system upgrade

[Brandon Kuczenski]

Problem solved: the deprecated command was found in the siunitx package, of
which I had a stale version. (arch users: I had to 'pacman -R
texlive-siunitx' (which no longer exists) and 'pacman -S texlive-science')
Thanks all,
Brandon


On Thu, Jun 3, 2021 at 11:28 PM Brandon Kuczenski <brandon at 301south.net>
wrote:

> Hi folks,
> I recently upgraded my system (arch linux) for the first time in about 90
> days. Now I cannot use the pstricks-add package.
> My example is as minimal as can be:
>
>
> \documentclass{article}
>
> \usepackage{pstricks-add}
>
> \listfiles
> \begin{document}
> hello world!
> \end{document}
>
> It produces the following error:
>
> ! Undefined control sequence.
> <argument> \LaTeX3 error:
>                            Use \cs_prefix_spec:N not
> \token_get_prefix_spec:...
> l.6 \begin{document}
>
> ?
>
> The file listing is also not generated because of the error. However I can
> confirm that I am using v3.89a of pstricks-add, which is the same as I see
> on CTAN.
>
> The log file is attached.
>
> If I substitute "pstricks" for "pstricks-add", then the document loads
> correctly.
>
> Any idea what is wrong? I know nothing of LaTeX3 and google didn't help.
>
> Thanks in advance,
> Brandon
>
>
>
>
>
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