Subject: Misleading error message when running guix-daemon as unprivileged user

From: Leo Famulari <[email-masked]>
Date: Mon, 11 Apr 2016 21:22:37 -0400

When trying to start the guix-daemon as an unprivileged user, the
following error message is printed:

error: cannot bind to socket `/var/guix/daemon-socket/socket': Address already in use

Would it make sense to try to provide a more helpful error message?