Not working due to jaraco.functools dependency?

Hello all,
I am not sure if this is the right place to ask.
I am unable to start a cherrypy instance since an update a few days ago.
This is the trace:

Traceback (most recent call last):
  File "webserver.py", line 22, in <module>
    import cherrypy
  File "/usr/lib/python3.6/site-packages/cherrypy/__init__.py", line 76, in 
<module>
    from . import _cprequest, _cpserver, _cptree, _cplogging, _cpconfig
  File "/usr/lib/python3.6/site-packages/cherrypy/_cpserver.py", line 8, in 
<module>
    from cherrypy.process.servers import ServerAdapter
  File "/usr/lib/python3.6/site-packages/cherrypy/process/__init__.py", 
line 14, in <module>
    from . import plugins, servers
  File "/usr/lib/python3.6/site-packages/cherrypy/process/servers.py", line 
126, in <module>
    import portend
  File "/usr/lib/python3.6/site-packages/portend.py", line 18, in <module>
    from tempora import timing
  File "/usr/lib/python3.6/site-packages/tempora/timing.py", line 137, in 
<module>
    class BackoffDelay(six.Iterator):
  File "/usr/lib/python3.6/site-packages/tempora/timing.py", line 225, in 
BackoffDelay
    @jaraco.functools.save_method_args
AttributeError: module 'jaraco.functools' has no attribute 
'save_method_args'

I'm surprised that this has not been mentioned here.
It seems to me that there's something wrong in cherrypy or in jaraco.
Does anyone know what to do about this?

Running under Arch Linux:
 * Python 3.6.6
 * Cherrypy 16.0.3-1
 * python-jaraco 2017.11.25-1

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