- adduser.conf is not a shell script, so don't try to parse it as such.
- rc.conf* are not shell scripts anymore.

Index: lenses/shellvars.aug
--- lenses/shellvars.aug.orig
+++ lenses/shellvars.aug
@@ -305,7 +305,6 @@ module Shellvars =
                      . incl "/etc/environment"
                      . incl "/etc/firewalld/firewalld.conf"
                      . incl "/etc/blkid.conf"
-                     . incl "/etc/adduser.conf"
                      . incl "/etc/cowpoke.conf"
                      . incl "/etc/cvs-cron.conf"
                      . incl "/etc/cvs-pserver.conf"
@@ -317,9 +316,7 @@ module Shellvars =
                      . incl "/etc/os-release"
                      . incl "/etc/periodic.conf"
                      . incl "/etc/popularity-contest.conf"
-                     . incl "/etc/rc.conf"
                      . incl "/etc/rc.conf.d/*"
-                     . incl "/etc/rc.conf.local"
                      . incl "/etc/selinux/config"
                      . incl "/etc/ucf.conf"
                      . incl "/etc/locale.conf"
