Hi Maintainer

The SyntaxWarning below were emitted when this package was tested with
pipuarts[1].

Regards
Graham


[1] https://piuparts.debian.org/sid/source/s/sphinx-a4doc.html


  Setting up python3-sphinx-a4doc (1.6.0-3) ...
  /usr/lib/python3/dist-packages/sphinx_a4doc/contrib/railroad_diagrams.py:520:
SyntaxWarning: invalid escape sequence '\ '
    """