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The latex renderer writes code block contents unescaped between
\begin{verbatim} and \end{verbatim}. LaTeX ends the environment at the
first literal \end{verbatim}, so a code block containing that line
closes it early and the rest of the block is read as TeX. Close the
environment before each occurrence, print it escaped in \texttt, and
reopen it.
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The latex renderer writes a code block's contents unescaped inside
\begin{verbatim}, and LaTeX ends that environment at the first literal\end{verbatim}, so a code block containing that line closes the environment early and the rest of the block is compiled as TeX. For example,cmark -t latexon a code block whose lines are\end{verbatim}and\newread\r\openin\r=secret.txt\read\r to\x\message{\x}prints the contents ofsecret.txtwhen the output is compiled (checked with tectonic), and\openoutor\write18go further where allowed. The renderer now closes the environment before each occurrence, prints it escaped in\texttt, and reopens it; the api_test case fails without the change.