调用同一函数内的函数来尝试捕获循环中的失败

Question

当我在手机上运行此代码时，它会运行每一步，然后当它发现故障时，它将返回到代码的开头，然后发出警报。我想要它做的是完全按照它的方式运行每个函数，但是，仅在最后一个函数运行时提醒我。在代码末尾记录打印。

--Step 1 Open Quests
questopen = function()
  log("Opening Quests")
local step1 = getColor(64, 803)
  log("Fetched Quest Icon")
  if step1 == 9127481 then
    tap(64, 803)
    log("Matched Quest Icon")
    else
    log("Failed Quest Icon")
    alert("Out of Sync - Check Logs for failure")
    collectgarbage()
    end
  end

--Step 2 Accept Quest
questaccept = function()
  log("Accepting Quest")
  local step2 = getColor(426, 1004)
  log("Fetched Accept Quest")
  if step2 == 2300441 then
    tap(426, 1004)
    log("Matched Accept Quest")
    else
    log("Failed Accept Quest")
    collectgarbage()
    questopen()
    end
  end

--Step 3 Skip Dialogue
skip = function()
  log("Skipping Dialogue")
  local step3 = getColor(564, 1083)
  log("Fetched Skip Dialogue")
  if step3 == 2300441 then
    tap(564, 1083)
    log("Matched Skip Dialogue")
    else
    log("Failed Skip Dialogue")
    collectgarbage()
    questaccept()
    end
  end

--Step 4 Quest Confirm
confirm = function()
  log("Confirming Quest")
  local step4 = getColor(124, 578)
  log("Fetched Confirm Quest")
  if step4 == 15921906 then
    tap(124, 578)
    log("Matched Confrim Quest")
    else
    log("Failed Confirm Quest")  
    collectgarbage()
    skip()
    end
  end

--Step 5 Quest Go
go = function()
  log("Quest Go")
  local step5 = getColor(424, 990)
  log("Fetched Quest Go")
  if step5 == 13750737 then
    tap(424, 990)
    log("Matched Quest Go")
    else
    log("Failed Quest Go")
    collectgarbage()
    confirm()
    end
  end 

questopen()
usleep(3000000)
questaccept()
usleep(3000000)
skip()
usleep(3000000)
confirm()
usleep(3000000)
go()
usleep(3000000)

我专门设计了这个以测试检测方法，所以我希望它在Step 2 Accept Quests失败。但目前我想要一种更好的错误检测方法，我想要提醒。但它会警告每一次失败。

我希望代码在第一次失败时倒退，但我不希望它在同一时间继续前进，错误报告将显示。

Gyazo image of error log