Follow-up Comment #1, bug #20844 (project freeciv):
This would require changes to unittools.c:do_upgrade_effects(), as the current
logic only checks for upgrade counts on a per-player basis, meaning that only
World and Player ranges can be used to control the Upgrade_Unit effect (as
there is no available information regarding the continent, city, tile, etc.).
That aside, I'm not sure why the Building is an unknown requirement: looks
like it might be a missing comma from the error message, but that's a wild
guess (as I don't see the corresponding missing comma in the presented ruleset
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