Summary and Info:
I recently installed package 'twisted-svn' from AUR, replacing package 'twisted'.

Now I want to to revert this with a simple
# pacman -S twisted
but pacman reports a file conflict error,

============================================================
checking for file conflicts...
twisted: /usr/lib/python2.7/site-packages/Twisted-13.2.0-py2.7.egg-info exists in filesystem
Errors occurred, no packages were upgraded.
============================================================

But IMHO this should not occur, as the reported file is owned by twisted-svn
(which will be removed):

============================================================
# pacman -Qo /usr/lib/python2.7/site-packages/Twisted-13.2.0-py2.7.egg-info
/usr/lib/python2.7/site-packages/Twisted-13.2.0-py2.7.egg-info is owned by twisted-svn 20140228.41773-1
============================================================

and furthermore the file is in fact a directory:

============================================================
# stat /usr/lib/python2.7/site-packages/Twisted-13.2.0-py2.7.egg-info
File: ‘/usr/lib/python2.7/site-packages/Twisted-13.2.0-py2.7.egg-info’
Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: 806h/2054d Inode: 408185 Links: 2
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2014-03-23 12:26:12.583967819 +0100
Modify: 2014-02-28 01:25:39.000000000 +0100
Change: 2014-02-28 01:28:44.478093456 +0100
Birth: -
============================================================


I attach the output given by
# pacman --debug -S twisted > >(tee stdout.log) 2> >(tee stderr.log >&2)
and by
# pacman -Qii twisted-svn


Steps to Reproduce:
# yaourt -S twisted-svn
# pacman -S twisted