case _KindSpecialFinalizer:
					// don't mark finalized object, but scan it so we
					// retain everything it points to.
					spf := (*specialfinalizer)(unsafe.Pointer(sp))
					// A finalizer can be set for an inner byte of an object, find object beginning.
					p := s.base() + uintptr(spf.special.offset)/s.elemsize*s.elemsize

					// Mark everything that can be reached from
					// the object (but *not* the object itself or