code: def p_const_vector_elem_list_list(p):
      
      if p[1] is None or p[3] is None:
          return
  
      if not is_static(p[3]):
          if isinstance(p[3], symbols.UNARY):
              tmp = make_constexpr(p.lineno(2), p[3])
          else:
              api.errmsg.syntax_error_not_constant(p.lineno(2))
              p[0] = None
              return
      else:
          tmp = p[3]
  
      if p[1] is not None:
          p[1].append(tmp)
      p[0] = p[1]
docs: const_number_list : const_number_list COMMA expr