[希腊语]babel + cleveref + 罗马页码 + 标签 = ☇

Question

喂食

\documentclass{article}
\usepackage[greek]{babel}%%% greek should not necessarily be the main language; e.g., [greek, ngerman] would also expose the bug.
\usepackage{cleveref}%%% option [ngerman] would not change the outcome.
\begin{document}
\pagenumbering{Roman}
\label{someLabel}
\end{document}

导致mwe.tex​pdflatex​

! 不完整 \iffalse；第 6 行之后的所有文本均被忽略。\fi <*> mwe

？

版本：

• pdfTeX，版本 3.141592653-2.6-1.40.22（TeX Live 2022/dev/Debian）
• LaTeX2e <2021-06-01> 补丁级别 1
• cleveref 0.21.4 或 0.21.5 (均暴露了该漏洞)
• 希腊语.ldf 2020/11/10 v1.10
• 巴贝尔 2021/07/22 3.63

该错误发生在当前 Debian 测试版“bookworm”中：https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=997024

cleveref、greek.ldf和的维护者babel已收到通知。同时，有什么解决方法吗？

Answer 1

问题出在\ensureascii宏上。你可以做到这一点\protected。

\documentclass{article}
\usepackage[greek]{babel}
\usepackage{etoolbox}
\usepackage{cleveref}

\AtBeginDocument{\robustify\ensureascii}

\begin{document}

\pagenumbering{Roman}
\label{someLabel}

\end{document}

Answer 2

您可以恢复原始的罗马计数器格式：

\documentclass{article}

\makeatletter
\let\@RomanSaved\@Roman
\usepackage[greek]{babel}%%% greek should not necessarily be the main language; e.g., [greek, ngerman] would also expose the bug.
\usepackage{cleveref}%%% option [ngerman] would not change the outcome.
\let\@Roman\@RomanSaved
\makeatother

\begin{document}
\pagenumbering{Roman}

\setcounter{page}{5}

\label{someLabel}
{\fontencoding{T1}\selectfont\pageref{someLabel}}
\end{document}