working_dir not expanding in template

[lancherider]

In the named.conf.options.erb template, the working_dir variable is not expanding. So, this line:

file "<%= @working_dir %>/named_querylog"

ends up looking like this in /etc/named/named.conf.options:

file "/named_querylog"

Interestingly, using @data_dir performs the substitution just fine, and of course, explicitly setting the path works too.