I've found that compiling the following texi file failed.
```
\input texinfo
@documentencoding UTF-8
@node «
@section a
@bye
```
Here is error messages in my environment.
```
$ texi2pdf aaa.texi
This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016/Cygwin)
(preloaded format=pdfetex)
restricted \write18 enabled.
entering extended mode
(./aaa.texi (/home/trueroad/tex/texinfo.tex
Loading texinfo [version 2016-09-12.20]: pdf, fonts, markup, glyphs,
page headings, tables, conditionals, indexing, sectioning, toc, environments,
defuns, macros, cross references, insertions,
(/usr/share/texmf-site/tex/generic/epsf/epsf.tex
This is `epsf.tex' v2.7.4 <14 February 2011>
) localization, formatting, and turning on texinfo input format.)
./aaa.texi:5: Argument of @guillemetleft has an extra }.
<inserted text>
@par
<to be read again>
}
@txiescapepdf ...se @xdef #1{@pdfescapestring {#1}
}@fi
@setpdfdestname ...{#1}@txiescapepdf @pdfdestname
}
@pdfmkdest #1->@setpdfdestname {#1}
@safewhatsit {@pdfdest name{@pdfdestname ...
@setref #1#2->@pdfmkdest {#1}
@iflinks {@requireauxfile @atdummies @def @valu...
...
l.5 @section a
?
```
In my investigation:
With texinfo.tex ver. 2016-08-09.22: failed
With texinfo.tex ver. 2016-08-09.20: succeed
The difference is the following commit.
http://lists.gnu.org/archive/html/texinfo-commits/2016-08/msg00018.html
