Follow-up Comment #4, bug #22874 (project freeciv):
> However, this behavior cannot work well anyway: considering a
> tech A with root_req B and a tech C with root_req D, what is
> supposed to be root_req of their children tech E?
It can even have it's own, third, root_req. That's why we were checking
requirements recursively, to get all three root_req's covered.
Advance structure would need to have list of root_reqs instead of single
root_req stored if we want all the inherited root_reqs available by checking
the tech itself only.
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