ubi-agni/xacro — pull request #1 by rhaschke (2014-06-26 22:47:20+00:00)
Title: allow for recursive evaluation of properties

Recursive evaluation of properties, i.e.

should work. Currently, ${a2} literally gives "${2*a}" instead of "84".
This patch adds this feature, correctly handling recursive definitions.
Proper functioning is checked by two new test cases.