code: def p_typed_var_list(self, p):
          '''typed_var_list : typed_var_list COMMA typed_var
                            | typed_var'''
          if len(p) == 4:
              p[1].append(p[3])
              p[0] = p[1]
          elif len(p) == 2:
              p[0] = [p[1]f p_typed_var_list(self, p):
          '''typed_var_list : typed_var_list COMMA typed_var
                            | typed_var'''
          if len(p) == 4:
              p[1].append(p[3])
              p[0] = p[1]
          elif len(p) == 2:
              p[0] = [p[1]]
docs: typed_var_list : typed_var_list COMMA typed_var
                            | typed_var