return value

  def exit_scope(self):
    self.symbols.pop()
    self.curr_table = self.symbols[len(self.symbols) - 1]
    if self.scf_scope > 0:
      self.scf_scope -= 1

  def in_scf_scope(self):
    return self.scf_scope > 0

  def lookup(self, name):
    curr_idx = len(self.symbols) - 1
    while curr_idx >= 0 and (name not in self.symbols[curr_idx]['symbols']):
      curr_idx -= 1