pnas_article() doesn't work with certain latest LaTeX packages

[yihui]

Today pnas_article() started to fail on Travis, with an obscure error message

! LaTeX Error: Missing \begin{document}.

I could reproduce the issue locally after I update all LaTeX packages via

remotes::install_github('yihui/tinytex')
tinytex::tlmgr_update()

Even the following minimal LaTeX example fails with the same error message:

\documentclass{pnas-new}
\begin{document}
a
\end{document}

I spent a few hours on this issue but couldn't figure out why it was broken. I wonder if it is time to consider updating pnas-new.cls now.

Cc @cboettig (author of pnas_article() #72).

[eddelbuettel]

I wonder if it is time to consider updating pnas-new.cls now.

That's what we did as our PNAS derivative pinp failed at CRAN: eddelbuettel/pinp#77

I got some rather decent debugging help from Kurt pointing to, in this case, issues with titlesec so we filed jbezos/titlesec#16 -- as we initially missed the newer pnas-new.cls that Debian's texlive maintainer then pointed out me us.

We have a PR pending that integrates it into pinp, currently waiting on coauthor @coatless to review.

[eddelbuettel]

I spoke too soon. "Just" newer PNAS does not do the trick, we also need an older titlesec. Investigation ongoing while stop-gap release made.

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