Comment # 9 on bug 977354 from Per Jessen

Actually, there is something odd going on. This example is from 13.1 - 

systemd-udev complains about this:

systemd-udevd[284]: invalid key/value pair in file
/usr/lib/udev/rules.d/90-hwrng.rules on line 1,starting at character 107 ('a')

I added a newline and it's fine. 

However, nothing complains about this rule:

/etc/udev/rules.d/70-persistent-net.rules:

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}=="00:14:85:a6:a8:3d", ATTR{type}=="1", KERNEL=="eth*",
NAME="eth0"

It has no trailing newline.  Also, in the 90-hwrng.rules file, character 107 is
not an 'a'.