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TeX Live 更新 2022-07-31 后出现 mathspec 错误“缺少数字，视为零”

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TeX Live 更新 2022-07-31 后出现 mathspec 错误“缺少数字，视为零”

更新 Tex Live 基础设施并随后更新新软件包版本后，我收到以下错误消息：

mathspec.sty:92: Missing number, treated as zero.
<to be read again> 
                   \protect 
l.92 ...Symbol{\Alpha}{\mathalpha}{operators}{"41}

如何修复？或者如何恢复到以前的 TL 版本？

XeLaTeXmk 拒绝编译。我正在做一个紧急项目。非常感谢您的快速回答。提前致谢。

这是导致错误的原因的 MWE。

% !TEX TS-program = XeLaTeX
% !TEX encoding = UTF-8 Unicode
%--------------------------------------------------------------
\documentclass[fontsize=11pt,paper=A4]{scrbook}
%--------------------------------------------------------------
\usepackage{ngerman}
\usepackage[quiet]{mathspec}
%······························································
% Undo the wrong changes made by mathspec
% Patch by Ulrike Fischer
\makeatletter
\let\RequirePackage\original@RequirePackage
\let\usepackage\RequirePackage
\makeatother
%······························································
\begin{document}
%······························································
This is an empty document.
%······························································
\end{document}

ngerman 包与 mathspec 冲突。如果您在 mathspec 之前（在 MWE 中注释掉）调用它，则会导致错误。如果您在之后（解决方案）调用它，错误就会消失。因此：（某些）依赖于语言的包必须在之后调用。

但是，除了亲身体验之外，我们“普通”用户如何知道加载我们想要使用的包的正确顺序呢？

答案1

您收到此错误

\documentclass{article}
\catcode`\"\active
\def"{\protect\relax}
\usepackage{mathspec}
\begin{document}

\end{document}


! Missing number, treated as zero.
<to be read again> 
                   \protect 
l.92 ...Symbol{\Alpha}{\mathalpha}{operators}{"41}
                                                  
?

"因此您已经在序言中加载了一些处于活动状态的包。

在这种情况下，它被证明是过时的ngerman包，可以用

\usepackage[german]{babel}

答案2

这里有一个解决方案。只需在 mathspec 之后调用 ngerman 即可。

% !TEX TS-program = XeLaTeX
% !TEX encoding = UTF-8 Unicode
%--------------------------------------------------------------
\documentclass[fontsize=11pt,paper=A4]{scrbook}
%--------------------------------------------------------------
%\usepackage{ngerman} Don't use it at this position
\usepackage[quiet]{mathspec}
\usepackage{ngerman}
%······························································
% Undo the wrong changes made by mathspec
% Patch by Ulrike Fischer
\makeatletter
\let\RequirePackage\original@RequirePackage
\let\usepackage\RequirePackage
\makeatother
%······························································
\begin{document}
%······························································
This is an empty document.
%······························································
\end{document}

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