          if self._b_i > self._break:
              self._break = -1
  
      cdef void pop(self) nogil:
          if self._s_i >= 1:
              self._s_i -= 1
  
      cdef void unshift(self) nogil:
          self.c.unshift()
          self._b_i -= 1
 
</s>
        self.c.pop()
          if self._b_i > self._break:
              self._break = -1
  
      cdef void pop(self) nogil:
        self.c.pop()
          if self._s_i >= 1:
              self._s_i -= 1
  
      cdef void unshift(self) nogil:
          self.c.unshift()
          self._b_i -= 1
keep keep keep add keep keep keep keep keep keep
 * Shadow StateClass with StateC, to start proxying
spacy/syntax/stateclass.pyx