Suspicious errors when running babel tests

[tkw1536]

Whenever I run the t/81_babel.t tests, I get the following errors:

> perl t/81_babel.t
1..6
ok 1 - use LaTeXML::Core;

Error:undefined:\@nil The token T_CS[\@nil] is not defined.
	at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	Defining it now as <ltx:ERROR/>
	In Core::Stomach[@0x7ff46a6fd7c0] at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	 <= Core::Gullet[@0x7ff46a6fd8e0] <= Core::Definition::Constructor[\usepac... <= Core::Stomach[@0x7ff46a6fd7c0] <= ...
ok 2 - t/babel/french

Error:undefined:\@nil The token T_CS[\@nil] is not defined.
	at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	Defining it now as <ltx:ERROR/>
	In Core::Stomach[@0x7ff46af19860] at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	 <= Core::Gullet[@0x7ff46f286168] <= Core::Definition::Constructor[\usepac... <= Core::Stomach[@0x7ff46af19860] <= ...
ok 3 - t/babel/german

Error:undefined:\@nil The token T_CS[\@nil] is not defined.
	at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	Defining it now as <ltx:ERROR/>
	In Core::Stomach[@0x7ff469c078c0] at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	 <= Core::Gullet[@0x7ff46aecdf90] <= Core::Definition::Constructor[\usepac... <= Core::Stomach[@0x7ff469c078c0] <= ...
ok 4 - t/babel/greek
ok 5 - t/babel/numprints

Error:undefined:\@nil The token T_CS[\@nil] is not defined.
	at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	Defining it now as <ltx:ERROR/>
	In Core::Stomach[@0x7ff471613800] at /usr/local/texlive/2017/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	 <= Core::Gullet[@0x7ff471611ad0] <= Core::Definition::Constructor[\usepac... <= Core::Stomach[@0x7ff471613800] <= ...
ok 6 - t/babel/page545

The tests themselves still pass (and thus appear to produce the exact xml required).

I am running the latest latexmlc from master (with dependencies installed via cpanm) along with TexLive 2017. I have been getting these errors both on my MacBook and my archlinux setup.

[swalter62]

I get the same error on debian testing. In addition, latexml throws an
Error:undefined:@nil
on a simple test file with the babel package. The output does not appear to be affected, but the error is picked up by my scripts, and is a nuisance.
Here's a minimal test file testme.tex:

\usepackage[english]{babel}
\begin{document}
This is a test.
\end{document}

And here's the output of latexml with no parameters:

latexml (LaTeXML version 0.8.2; revision e581ef5e)
processing started Sun Jul  9 22:25:12 2017

(Digesting TeX testme...
(Loading /usr/local/share/perl/5.24.1/LaTeXML/Package/TeX.pool.ltxml...
(Loading /usr/local/share/perl/5.24.1/LaTeXML/Package/eTeX.pool.ltxml... 0.00 sec)
(Loading /usr/local/share/perl/5.24.1/LaTeXML/Package/pdfTeX.pool.ltxml... 0.01 sec) 0.11 sec)
(Processing content /home/pub/test/testme.tex...
(Loading /usr/local/share/perl/5.24.1/LaTeXML/Package/LaTeX.pool.ltxml... 0.13 sec)
(Loading /usr/local/share/perl/5.24.1/LaTeXML/Package/article.cls.ltxml... 0.01 sec)
(Loading /usr/local/share/perl/5.24.1/LaTeXML/Package/babel.sty.ltxml...
(Processing definitions /usr/share/texlive/texmf-dist/tex/generic/babel/babel.sty...
(Processing definitions /usr/share/texlive/texmf-dist/tex/generic/babel/switch.def... 0.04 sec)
Error:undefined:\@nil The token T_CS[\@nil] is not defined.
	at /usr/share/texlive/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	Defining it now as <ltx:ERROR/>
	In Core::Stomach[@0x55b664cff5f8] at /usr/share/texlive/texmf-dist/tex/generic/babel/babel.sty; line 380 col 7
	 <= Core::Gullet[@0x55b6652e3a58] <= Core::Definition::Constructor[\usepac... <= Core::Stomach[@0x55b664cff5f8] <= ...

(Processing definitions /usr/share/texlive/texmf-dist/tex/generic/babel-english/english.ldf...
(Loading /usr/local/share/perl/5.24.1/LaTeXML/Package/babel.def.ltxml...
(Processing definitions /usr/share/texlive/texmf-dist/tex/generic/babel/babel.def...
(Processing definitions /var/lib/texmf/tex/generic/config/language.def... 0.03 sec) 0.51 sec) 0.56 sec) 0.74 sec) 1.23 sec) 1.36 sec) 1.56 sec) 1.69 sec)
(Building...
(Loading compiled schema /usr/local/share/perl/5.24.1/LaTeXML/resources/RelaxNG/LaTeXML.model... 0.01 sec). 0.05 sec)
(Rewriting... 0.00 sec)
(Finalizing... 0.00 sec)
Conversion complete: 1 error; 1 undefined macro[\@nil].
processing finished Sun Jul  9 22:25:13 2017
<?xml version="1.0" encoding="UTF-8"?>
<?latexml searchpaths="/home/pub/test"?>
<?latexml class="article"?>
<?latexml package="babel" options="english"?>
<?latexml RelaxNGSchema="LaTeXML"?>
<document xmlns="http://dlmf.nist.gov/LaTeXML">
  <resource src="LaTeXML.css" type="text/css"/>
  <resource src="ltx-article.css" type="text/css"/>
  <para xml:id="p1">
    <p>This is a test.</p>
  </para>
</document>

I'm guessing this error is due to a change in babel. Am I right, Bruce?

[brucemiller]

@swalter62 , I suspect you are. I'll look into it soon as I get back to a machine.

[brucemiller]

It was revealed by a change to babel.sty, which started using a macro for class options that we hadn't bothered to set. Should work now; thanks for the report!

[swalter62]

It does indeed work now. Problem solved, thanks a million Bruce!