Comment 4 for bug 862383

Yes, that would be negative for performance. But I guess that is actually the same for all kinds of subdomains? For example f*dx(1)+g*dx(2) would cause evaluation of both f and g for both domains 1 and 2, because there is no propagation of dependencies through UFC. I would settle for a hack making this case work correctly (a warning would be fine), and the performance issue should be addressed in the future through some design involving UFC.