  
      cdef void add_arc(self, int head, int child, int label) nogil:
          if self.has_head(child):
              self.del_arc(self.H(child), child)
  
          cdef int dist = head - child
          self._sent[child].head = dist
          self._sent[child].dep = label
 
</s>
        self.c.add_arc(head, child, label)
  
      cdef void add_arc(self, int head, int child, int label) nogil:
        self.c.add_arc(head, child, label)
          if self.has_head(child):
              self.del_arc(self.H(child), child)
  
          cdef int dist = head - child
          self._sent[child].head = dist
          self._sent[child].dep = label
keep add keep keep keep keep keep keep
 * Shadow StateClass with StateC, to start proxying
spacy/syntax/stateclass.pyx