An issue with current TeXLive (scrartcl?)

[Joseph Wright]

On 04/08/2022 13:22, Angelo Graziosi via tex-live wrote:
> After updating TeXLive, the following STC, created from a more complex document, does not build any more:
> 
> ---------------------
> $ cat test.tex
> \documentclass{scrartcl}
> 
> \newcommand{\RomanNumeralCaps}[1]{\MakeUppercase{\romannumeral #1}}
> 
> \begin{document}
> hello! \RomanNumeralCaps{5}
> \end{document}
> 
> $ pdflatex test.tex
> [...]
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/scrartcl.cls
> Document Class: scrartcl 2022/07/04 v3.37 KOMA-Script document class (article)
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/scrkbase.sty
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/scrbase.sty
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/scrlfile.sty
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/scrlfile-hook.sty
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/scrlogo.sty)))
> (/LocalApps/texlive/texmf-dist/tex/latex/graphics/keyval.sty)))
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/tocbasic.sty)
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/scrsize11pt.clo)
> (/LocalApps/texlive/texmf-dist/tex/latex/koma-script/typearea.sty))
> (/LocalApps/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def)
> No file test.aux.
> ---------------------
> 
> Here it hangs. After CTRL-C it prints:
> 
> ---------------------
> \__text_expand_loop:w ..._text_expand_space:w }}#1
>                                                    \q__text_recursion_stop
> l.8 hello! \RomanNumeralCaps{5}
> 
> ?
> ---------------------
> 
> Changing the newcommand to
> 
> \newcommand{\RomanNumeralCaps}[1]{#1}
> 
> it builds. The last time I have built the full document was on may 31, 2022 (about two months ago).

Your use of \romannumeral is not properly terminated: this confuses the 
new case-changing code. Add a space to terminate:

     \newcommand{\RomanNumeralCaps}[1]{\MakeUppercase{\romannumeral #1 }}

Joseph