Error al compilar este ejemplo usando Vanilla XeLaTeX ( XeTeX 3.141592653-2.6-0.999994 (TeX Live 2022)) o LuaLaTeX ( This is LuaHBTeX, Version 1.15.0 (TeX Live 2022)).
Tengo la siguiente clase test.cls:
\ProvidesClass{test}[2022/05/06 Test class]
\DeclareOption{portuguese}{\def\my@mainlanguage{portuguese}}
\DeclareOption{english}{\def\my@mainlanguage{english}}
\ProcessOptions\relax
\ExecuteOptions{}
\LoadClass{article}\RequirePackage{polyglossia}
\setmainlanguage{\my@mainlanguage}
Y un documento de muestra:
\documentclass[portuguese]{test}
\title{Test}
\begin{document}
\maketitleTest
\end{document}
El mensaje de error es:
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.Type H <return> for immediate help. ...
l.8 \setmainlanguage{\my@mainlanguage}
Se compila sin errores usando TeXLive desde 2021.