the ref gives the example of:
...
obj/snow
screen_loc = "CENTER"
particles = new/particle/snow
Even correcting for http://www.byond.com/forum/post/2652272 (/particle/snow: undefined type path),...
This fails to compile with a `main.dm:52:error: particles: bad variable` error.
Workarounds: not using the feature
New()
particles = new/particles/snow
might work