Leftover files with `-o -'

If we redirect hevea output to stdout one or more
auxilliary files appear in the current working directory.

mkdir d
cd d
hevea -o - <<EOF  > /dev/null
\documentclass{article}
\begin{document}
\section{S}
\end{document}
EOF
ls

This is particularly unfunny if $PWD has no write premission.

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