Timeout 在我的expect脚本中，它在哪里超时？

在我的expect脚本expect_after中，捕获来自BadPromptPassword的超时，但是如何返回这是我的expect脚本超时的地方？我已经和expect_玩过了，它没有给我我需要的东西。。。谢谢你的帮助。谢谢

spawn telnet 172.27.228.239
expect {
    timeout { puts "Timed out waiting for response from telnet ('172.27.228.230',)."; exit 1}
    "Password:" { send "lab\r"; }
    "\[>#\]"
};

send "en\r"
expect_after {
    timeout {
      puts "a default timeout clause for all subsequent expect commands ";
      exit 1
    }
}
expect "#>"
send "admin"
expect "BadPromptPassword:"
send "lab\r"
close
wait

这里有一个快速破解

expect_after {
    timeout {
        puts "timed-out expecting $pattern";
        exit 1
    }
}

set pattern "#>"
expect $pattern
send "admin"

set pattern "BadPromptPassword:"
expect $pattern
send "lab\r"