Looks like you’re using a custom template; you’re probably missing something we do in the default template.
Get the default using
pandoc -D latex
and compare it to what you’re using.

> On Feb 1, 2023, at 1:22 PM, Mouse Mousevich <uri-OVIABD91gjs3uPMLIKxrzw@public.gmane.org> wrote:
> 
> pandoc-2.19.2, pdflatex from TeXLive-2022.
> Rust-book set of .md files from https://github.com/killercup/trpl-ebook.git (version from 2016).
> 
> Conversion to LaTeX seems to succeed, but subsequent invocation of pdflatex fails.
> 
> I printed out arguments passed to pandoc:
> pandoc args: --from=markdown+smart+grid_tables+pipe_tables-simple_tables+raw_html+implicit_figures+footnotes+intraword_underscores+auto_identifiers-inline_code_attributes --embed-resources --standalone --highlight-style=tango --top-level-division=chapter --table-of-contents --template=lib/template.tex --pdf-engine=pdflatex --to=latex --pdf-engine-opt=--interaction=nonstopmode --variable papersize=letterpaper --output=dist/trpl-2019-05-04.letter.pdf; plus book itself
> 
> Error message from pdflatex:
> 
> Error producing PDF.
> 
> ! Missing number, treated as zero.
> 
> <to be read again> 
> 
>                    (
> 
> l.306 \begin
> 
> 
> 
> This is what the (apparently) relevant fragment of the LaTeX file looks like:
> 
> 299   │ \begin{longtable}[]{@{}
> 
>  300   │   >{\raggedright\arraybackslash}p{(\columnwidth - 8\tabcolsep) * \real{0.4189}}
> 
>  301   │   >{\raggedright\arraybackslash}p{(\columnwidth - 8\tabcolsep) * \real{0.0676}}
> 
>  302   │   >{\raggedright\arraybackslash}p{(\columnwidth - 8\tabcolsep) * \real{0.0676}}
> 
>  303   │   >{\raggedright\arraybackslash}p{(\columnwidth - 8\tabcolsep) * \real{0.0676}}
> 
>  304   │   >{\raggedright\arraybackslash}p{(\columnwidth - 8\tabcolsep) * \real{0.3784}}@{}}
> 
>  305   │ \toprule()
> 
>  306   │ \begin{minipage}[b]{\linewidth}\raggedright
> 
>  307   │ Target
> 
>  308   │ \end{minipage} & \begin{minipage}[b]{\linewidth}\raggedright
> 
>  309   │ std
> 
>  310   │ \end{minipage} & \begin{minipage}[b]{\linewidth}\raggedright
> 
> 
> 
> 
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