我最近将所有 TeX Live 2021 包都更新到了最新版本，之后使用memoir、chemmacros和的文档float不再起作用。
以下是重现该问题的最小示例：
\documentclass{memoir}
\usepackage{chemmacros}
\usepackage{float}
\begin{document}
some text
\end{document}
编译此文档失败并出现以下错误：LaTeX Error: Missing \begin{document}.
到目前为止我发现了以下情况：
- 在更新到最新的软件包版本之前，这个问题没有出现。
- 如果我将 documentclass 切换为 ，则不会出现该问题
article。 chemmacros如果我删除或，问题就不会发生float。chemmacros如果我改变和的顺序，问题仍然会出现float。- 我在两台计算机上尝试了此操作，其中一台运行 Linux，另一台安装了 Windows，两台计算机都发生了同样的事情。
- 我还尝试从头开始输入该文件，以确保没有可能导致问题的不可见字符。
我的问题是我应该如何处理这个问题？这看起来像是一个错误，但我不知道哪个软件包有这个错误，所以我不知道应该在哪里提交错误报告。
我能做些什么来实现这个功能？
我应该采取什么步骤来解决这个问题并找出问题的原因？
这是完整的输出。
This is pdfTeX, Version 3.141592653-2.6-1.40.23 (TeX Live 2021) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./document.tex
LaTeX2e <2021-11-15> patch level 1
L3 programming layer <2022-01-21>
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LaTeX hooks Warning: Generic hook 'package/before/framed' is deprecated.
(hooks) Use hook 'package/framed/before' instead.
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LaTeX hooks Warning: Generic hook 'package/before/float' is deprecated.
(hooks) Use hook 'package/float/before' instead.
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(/usr/local/texlive/2021/texmf-dist/tex/generic/pgf/frontendlayer/tikz/tikz.cod
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Loading the chemmacros module `isotopes' ...
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Loading the chemmacros module `mechanisms' ...
Loading the chemmacros module `newman' ...
Loading the chemmacros module `orbital' ...
Loading the chemmacros module `polymers' ...
Loading the chemmacros module `reactions' ...
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For additional information on amsmath, use the `?' option.
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Loading the chemmacros module `redox' ...
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./document.tex:6: LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.6 \begin{document}
?
./document.tex:6: Emergency stop.
...
l.6 \begin{document}
./document.tex:6: ==> Fatal error occurred, no output PDF file produced!
Transcript written on build/document.log.
Compilation failed.
答案1
问题是 执行此操作实际上取消了 的定义memoir。现在，当加载时，的定义有效，而 的定义无效。但是 仍然认为 的定义有效。\AtBeginPackage{float}{\let\newfloat\relax}\newfloatfloat\newfloatfloatmemoirchemmacrosmemoir
memoir的版本\newfloat有一个可选参数，float而 的版本没有。那么什么时候chemmacros在文档开头执行这个
\newfloat[chapter]{scheme}{los}{scheme}
现在相当于
\newfloat{[}{c}{h}apter]{scheme}{los}{scheme}
[定义并排版了一个名为的浮点数apter]{scheme}{los}{scheme}，从而触发了错误。
整个事情可能被视为 的 bug chemmacros。在版本 6 之前，chemmacros这个问题没有被发现，因为默认情况下chemmacros没有加载模块。现在它确实加载了。scheme
因此，在我修复此问题之前，您可以加载最少的模块chemmacros并仅添加您需要的模块（不含模块scheme）
\documentclass{memoir}
\usepackage[minimal,modules={redox,reactions}]{chemmacros}
\usepackage{float}
\begin{document}
some text
\end{document}
更新
chemmacros此问题已在v6.1 (2022/02/13)中修复