有一个错误让我抓狂，而且乳胶不能帮助我了解发生了什么。
\documentclass[a4paper]{scrlttr2}
\usepackage{invoice}
\usepackage[pdftex]{graphicx}
\begin{document}
\end{document}
然后你可以尝试：
$ pdflatex error.tex
This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2014) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./error.tex
LaTeX2e <2011/06/27>
Babel <3.9k> and hyphenation patterns for 2 languages loaded.
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrlttr2.cls
Document Class: scrlttr2 2013/12/19 v3.12 KOMA-Script document class (letter)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrkbase.sty
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrbase.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrlfile.sty
Package scrlfile, 2013/12/19 v3.12 KOMA-Script package (loading files)
Copyright (C) Markus Kohm
))) (/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrsize12pt.clo)
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/typearea.sty
Package typearea, 2013/12/19 v3.12 KOMA-Script package (type area)
Copyright (C) Frank Neukam, 1992-1994
Copyright (C) Markus Kohm, 1994-
)) (/usr/share/texlive/texmf-dist/tex/latex/koma-script/DIN.lco)
(/usr/share/texlive/texmf-dist/tex/latex/invoice/invoice.sty
(/usr/share/texlive/texmf-dist/tex/latex/base/ifthen.sty)
(/usr/share/texlive/texmf-dist/tex/latex/tools/longtable.sty)
(/usr/share/texlive/texmf-dist/tex/latex/tools/calc.sty)
(/usr/share/texlive/texmf-dist/tex/plain/fp/fp.tex
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp.sty
`Fixed Point Package', Version 0.8, April 2, 1995 (C) Michael Mehlich
(/usr/share/texlive/texmf-dist/tex/latex/fp/defpattern.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-basic.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-addons.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-snap.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-exp.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-trigo.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-pas.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-random.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-eqn.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-upn.sty)
(/usr/share/texlive/texmf-dist/tex/latex/fp/fp-eval.sty)))
(/usr/share/texlive/texmf-dist/tex/latex/invoice/invoice.def))
(/usr/share/texlive/texmf-dist/tex/latex/graphics/graphicx.sty
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.17 \NeedsTeXFormat{LaTeX2e}[
1995/12/01]
?
这里有人知道发生了什么事吗？
答案1
该invoice包装彻底破坏了乳胶的现有形态。
如果你复制一份并将第 152 行从
\input{fp}
到
\RequirePackage{fp}
那么你的测试文件就可以正常工作。
因为它加载了fp.tex定义存根版本的 latex 命令可用于纯 TeX，但它会完全破坏 latex。