Not all reftex commands within latex block generate appropriate message

[Alain . Cochard]

Issued after 'org-edit-special' within a latex block (like the one
below) the command 'reftex-toc' generates the dreadful

   reftex-TeX-master-file: Wrong type argument: stringp, nil

Only after some debugging time and trying

   reftex-label

did I understand what I presume is the reason:

   reftex-access-scan-info: RefTeX works only in buffers visiting a file


#+begin_export latex
\documentclass{article}
\begin{document}
\section{1}
\section{2}
\end{document}
#+end_export

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