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Richard SmithandJon Ross-Perkins
949ec17da2
If there's a unique "preferred" base class, then treat that as "the" base class for Carbon's purposes. In particular: * If there's exactly one polymorphic base class, that's our preferred base class. * If there's exactly one non-empty base class, that's our perferred base class. * (Degenerate case) If there's exactly one base class, that's our preferred base class. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>