[tex-live] Strange bug with l3kernel

[Joseph Wright]

On 16/05/2018 20:13, Benoit Rivet wrote:
> I recently updated MacTex 2018 with Tex Live Utility and stumbled upon a strange bug. The following minimal example compiled with lualatex fails :
> 
> % !TEX TS-program = luaLaTeX
> \documentclass{article}
> \usepackage[utf8]{luainputenc}
> \usepackage{fouriernc}
> \usepackage{mdframed}
> 
> \begin{document}
> 
> \end{document}
> 
> Here are the relevant lines in the log :
> 
>> (/usr/local/texlive/2018/texmf-dist/tex/latex/l3kernel/expl3-code.tex
>> ! Illegal parameter number in definition of \c__tl_i_ogonek_tl.
>> <to be read again>
>> \crcr
>> l.26054   \__tl_tmp:w \c__tl_i_ogonek_tl  { 012F }
>>                                                  
>> ?
>> ! Illegal parameter number in definition of \c__tl_I_ogonek_tl.
>> <to be read again>
>> \crcr
>> l.26055   \__tl_tmp:w \c__tl_I_ogonek_tl  { 012E }
>>                                                  
>> ?
> 
> Everything compiles fine when reverting to the previous versions of l3experimental, l3kernel et l3package (46875, 46875, 46712 instead of the current 47705, 47718, 47705) or when removing one of the three packages used in the example or compiling with pdflatex.
> 
> So… I can’t figure out what is going on :-(

I can :)

The issue arises as "į" is made active (by luainputenc) and given a 
definition which is not happy inside an \edef. The recent change was on 
the basis that in LuaTeX/XeTeX all of the chars we need to set up 
internally are catcode 11/12. I'll adjust to harden up.

Joseph