ETBlue: local variable 'promises_info' referenced before assignment # http://disa.csie.org:5566/candidate/%E9%BB%83%E5%AE%8F%E6%88%90%E5%8F%B0%E7%81%A3%E9%98%BF%E6%88%90%E4%B8%96%E7%95%8C%E5%81%89%E4%BA%BA