Footnotes in the YAML frontmatter

[yihui]

Unfortunately the PR #252 by @robjhyndman introduced a bug (originally reported at yihui/knitr#923), and one can no longer use footnotes in the title or author fields. A reproducible example:

---
title: "my title with footnote^[footnote that produces an error]"
author: "Fulano de Tal^[here too]"
date: "16/12/2014"
output:
  pdf_document:
    keep_tex: yes

---

Hello world.

This version works:

# before the PR
devtools::install_github('rstudio/rmarkdown@b1779030b63329ee2960fce2022db69ed104e08c')

This no longer works:

# after the PR
devtools::install_github('rstudio/rmarkdown@698dfdd0e96bf82a775d1197a31593d8c65c2425')

You get a LaTeX error:

! Argument of \reserved@a has an extra }.
<inserted text> 
                \par 
l.52 ...footnote{footnote that produces an error}}

pandoc: Error producing PDF from TeX source
Error: pandoc document conversion failed with error 43
Execution halted

Not sure if @robjhyndman can fix it.

More background on this issue: e0adbbe

[github-actions]

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