[xml2rfc] Unable to run xml2rfc --help

Roger Price <roger@rogerprice.org> Fri, 25 December 2020 14:24 UTC

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Date: Fri, 25 Dec 2020 15:24:25 +0100
From: Roger Price <roger@rogerprice.org>
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Subject: [xml2rfc] Unable to run xml2rfc --help
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I downloaded xml2rfc onto a Debian Stretch machine and ran the command

  xml2rfc --help

as described at 
https://tools.ietf.org/src/xml2rfc/trunk/cli/doc/xml2rfc3.html#format-switches

The result was

Traceback (most recent call last):
   File "/usr/bin/xml2rfc", line 7, in <module>
     from xml2rfc.run import main
   File "/mnt/home/rprice/.local/lib/python3.5/site-packages/xml2rfc/__init__.py", line
     14, in <module>
     from xml2rfc.parser import  XmlRfcError, CachingResolver, XmlRfcParser, XmlRfc
...
   File "/usr/lib/python3.5/sre_parse.py", line 437, in _parse_sub
     itemsappend(_parse(source, state))
   File "/usr/lib/python3.5/sre_parse.py", line 575, in _parse
     raise source.error(msg, len(this) + 1 + len(that))
sre_constants.error: bad character range ”-“ at position 7

I am obviously doing something wrong, but I can't see what it is.  Any 
suggestion would be much appreciated.

Roger