我一直在尝试解决我收到的这个警告：
(\end occurred when \iftrue on line n was incomplete)
在哪里n始终是包含的行\begin{document}，并且我已将所有内容删除为几行简单的行，但仍然会产生警告：
\documentclass{book}
\usepackage[backend=bibtex]{biblatex}
\bibliography{main.bib}
\title{Some Title}
\begin{document}
Nothing important. %\cite{somebibkey}
%\printbibliography
\end{document}
两个注释掉的命令对于警告没有任何影响——取消注释没有任何效果。
bib 文件中有一个格式良好的条目。注释掉该\bibliography命令也没什么区别。
如果我添加\tracingifs=1，我会得到一堆看起来不太有用的行（对我来说）：
...
Package biblatex Info: Trying to load configuration file...
Package biblatex Info: ... file 'biblatex.cfg' found.
("C:/Users/user/AppData/Local/Programs/MiKTeX 2.9/tex/latex/biblatex/biblatex.cfg"
File: biblatex.cfg
)))
vertical mode: \ifcsname: (level 1) entered on line 10}
{\fi: \ifcsname (level 1) entered on line 10}
{\ifx: (level 1) entered on line 10}
{\else: \ifx (level 1) entered on line 10}
{\fi: \ifx (level 1) entered on line 10}
{\ifcsname: (level 1) entered on line 10}
{\fi: \ifcsname (level 1) entered on line 10}
{\ifx: (level 1) entered on line 10}
{\else: \ifx (level 1) entered on line 10}
{\fi: \ifx (level 1) entered on line 10}
{\ifx: (level 1) entered on line 10}
...
{\else: \ifx (level 1) entered on line 10}
{\fi: \ifx (level 1) entered on line 10}
{\ifcsname: (level 1) entered on line 10}
{\else: \ifcsname (level 1) entered on line 10}
{\fi: \ifcsname (level 1) entered on line 10}
{restricted horizontal mode: \ifcsname: (level 1) entered on line 10}
{\else: \ifcsname (level 1) entered on line 10}
{\fi: \ifcsname (level 1) entered on line 10}
Package biblatex Info: Trying to load language 'english'...
{\ifeof: (level 1) entered on line 10}
{\else: \ifeof (level 1) entered on line 10}
{\fi: \ifeof (level 1) entered on line 10}
Package biblatex Info: ... file 'english.lbx' found.
{\ifx: (level 1) entered on line 10}
{\else: \ifx (level 1) entered on line 10}
{\fi: \ifx (level 1) entered on line 10}
{\ifdefined: (level 1) entered on line 10}
{\ifx: (level 2) entered on line 10}
{\else: \ifx (level 2) entered on line 10}
{\fi: \ifx (level 2) entered on line 10}
{\else: \ifdefined (level 1) entered on line 10}
{\fi: \ifdefined (level 1) entered on line 10}
{\ifdefined: (level 1) entered on line 10}
{\ifx: (level 2) entered on line 10}
{\else: \ifx (level 2) entered on line 10}
{\fi: \ifx (level 2) entered on line 10}
{\else: \ifdefined (level 1) entered on line 10}
{\fi: \ifdefined (level 1) entered on line 10}
{\ifdefined: (level 1) entered on line 10}
{\ifx: (level 2) entered on line 10}
{\else: \ifx (level 2) entered on line 10}
{\fi: \ifx (level 2) entered on line 10}
{\else: \ifdefined (level 1) entered on line 10}
{\fi: \ifdefined (level 1) entered on line 10}
("C:/Users/user/AppData/Local/Programs/MiKTeX 2.9/tex/latex/biblatex/lbx/english.lbx"
{\ifnum: (level 1) entered on line 1}
{\ifnum: (level 2) entered on line 1}
...
{\fi: \iffalse (level 1) entered on line 10}
{\ifeof: (level 1) entered on line 10}
{\else: \ifeof (level 1) entered on line 10}
{\fi: \ifeof (level 1) entered on line 10}
(C:/Users/user/workspaces/tex/luatex-hello-world/src/./_main.aux)
{\iftrue: (level 1) entered on line 10}
\openout1 = _main.aux
{\fi: \iftrue (level 1) entered on line 10}
LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 10.
{\ifx: (level 1) entered on line 10}
{\fi: \ifx (level 1) entered on line 10}
{\ifx: (level 1) entered on line 10}
（该日志长达 11,619 行\iftracing=1——否则我就不会像随机那样截断它。）
**注意：在上述日志的情况下，n== 10 == 在哪里\begin{document}。
无论我使用的是 LuaLaTeX 还是 pdfTeX，都会出现此警告。
版本：
- BibTeX-版本 0.99d（MiKTeX 2.9）
- biblatex 2016/03/03 v3.3 可编程书目 (PK/JW/AB)
- LuaTeX，版本 beta-0.80.0（MiKTeX 2.9）（修订版 5238）
- pdfTeX，版本 3.14159265-2.6-1.40.16（MiKTeX 2.9）
这是否只是我需要承受的一个警告，还是我做错了什么？
提前致谢。
答案1
非封闭条件是一个问题；您的输入没有问题，所以这是一个错误biblatex（或者更具体地说是 BibTeX 支持部分）。目前（2016 年 4 月）改变 Biber/BibTeX 拆分处理方式的工作已进入后期阶段，而对于开发版本，我没有发现问题。因此，我建议“等待维护团队更新biblatex”作为最佳解决方案：可能将于 2016 年 5 月下旬/6 月初发生。