Triying to use a patch for \overarc from this answer
https://tex.stackexchange.com/a/409106/54817
I got this result
\documentclass{article}
%\usepackage{fix-cm}
\usepackage{arcs}
\usepackage{etoolbox}
\makeatletter
\patchcmd{\over@under@arc}
{\relsize{-10}}{\renewcommand\RSpercentTolerance{5}\relsize{-10}}{}{\fail}
\makeatother
\begin{document}
\Huge
$$\overarc{AB}$$
\end{document}
Log file:
https://pastebin.com/T5NRMvtb


arcstries larger sizes, but there aren't defined above\Hugeand the bug reappears. – egreg Feb 08 '19 at 13:11\Huge. – Salim Bou Feb 08 '19 at 13:15fix-cmpackage ( without the patch) I got the same thing – Salim Bou Feb 08 '19 at 13:18\overarc? – Salim Bou Feb 08 '19 at 13:51