---- On Mon, 22 Oct 2018 22:06:56 +0200 luigi scarso <luigi.scarso@gmail.com> wrote ---- 
 > 
 > 
 > On Mon, Oct 22, 2018 at 9:58 PM Marcel Krüger <tex@2krueger.de> wrote:
 > 
 > Thank you for the report. Do you have a sample document ?
 > 

On my system at least this is triggered by the following LuaLaTeX document:

\documentclass{article}
\usepackage{unicode-math}
\show\document
\letcharcode"305=\relax
\show\document
\begin{document}
\end{document}

Beside failing during \begin{document}, you can see that between the `\show\document` lines
a occurence of `\ifdim \topskip <1sp` changes to `\ifdim ̅<1sp`.

I could not reproduce it with ConTeXt/plain yet.


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