plain TeX: undefined control sequence \protected

[Philip Taylor (Hellenic Institute)]

Rodolfo Medina wrote:
> I get a different error:
David wrote "\csname", you wrote "\ifcsname".
-- 
/Philip Taylor/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://tug.org/pipermail/texhax/attachments/20221202/e4d4b8f0/attachment.html>