A covenant real, whereby the grantor of an estate of
   freehold and his heirs were bound to warrant and defend the title, and,
   in case of eviction by title paramount, to yield other lands of equal
   value in recompense. This warranty has long singe become obsolete, and
   its place supplied by personal covenants for title. Among these is the
   covenant of warranty, which runs with the land, and is in the nature of
   a real covenant.