Loading `expl3-generic.tex` in LuaMetaTeX fails with `expl3.lua:421: table index is nil` since TeX Live 2024 about latex3

[josephwright]

I've tracked down this part: LMTX has renamed a few functions again. (Aside: we need to decide whether to keep the intermediate names or to drop them).

There's a second issue: I'm working on that too.

[josephwright]

(I do hope that Hans sticks to just % - it would be a lot more convenient as there are something like 1600 uses of ; in l3fp!)

[josephwright]

Right, second issue is that LuaMetaTeX accepts ; as part of \numexpr (seems to be undocumented) - we use that a lot as a delimiter, so need to change it.

[Witiko]

Right, second issue is that LuaMetaTeX accepts ; as part of \numexpr (seems to be undocumented) - we use that a lot as a delimiter, so need to change it.

Could that perhaps be a bug in LuaMetaTeX? Might be best to ask Lua(Meta)TeX devs on the [email protected] mailing list before we go out of our way to fix what is possibly not our bug in a fringe TeX engine.

[josephwright]

OK, I'll check: my feeling is this is by-design but you never know.

[josephwright]

Seems that support for ; is by-design in LuaMetaTeX \numexpr. Changing the expl3 code to use a different delimiter is going to be non-trivial: I will look at this but it won't be for a little while.