docs: def ret(self, retn_target=None):
          """
          Pop one or many call frames from the stack. This method is called when returning from a function in CFG
          recovery.
  
          :param int retn_target: The target to return to.
          :return: None
          """
  
          if retn_target is None:
              return self.pop()
  
          # We may want to return to several levels up there, not only a
          # single stack frame
          return_target_index = self._find_return_target(retn_target)
  
          if return_target_index is not None:
  
              o = self
              while return_target_index >= 0:
                  o = o.pop()
                  return_target_index -= 1
              return o
  
          l.warning("Returning to an unexpected address %#x", retn_target)
          return self