Fatal error with ConTeXt mkiv in TL 2025

[Bruno Voisin]

Has anyone tried using ConTeXt with the latest pretest?

Typesetting Hello-World.tex from <https://wiki.contextgarden.net/Introduction/Quick_Start>, with all package updates applied, everything's fine using just "context", so LuaMetaTeX hence mkxl, but "context --luatex", hence mkiv, gives

tex error       > tex error on line 76 in file /Users/brunovoisin/Desktop/Build/Test/context/Hello-world.tex: ! Undefined control sequence
l.76 An equation can be typeset inline like $e^{\pi
                                                    i}+1=0$, or as a
[..]
mtx-context     | fatal error: return code: 256

So it seems \pi is undefined.

The same doesn't happen with TL 2024, Hello-World.tex typesets OK with both mkiv and mkxl.

Problem is, I don't use ConTeXt myself, I was just testing, I have no idea how ConTeXt works internally.

I couldn't figure out how \pi is defined in mkiv. Or maybe mkiv just uses enco-def.mkii?

Bruno Voisin