lua脚本文件语法解析_如果有语法错误_指出错误原因

--------------------------------------------------------
-- start.lua
--------------------------------------------------------

a = 1
if a==1  -- missed  KeyWord    then
    print("in if")
else
    print("in else")
end

--------------------------------------------------------
-- main.lua
--------------------------------------------------------
chunk,errMsg = loadfile("start.lua")

if not errMsg then
    chunk()
else
    print("some error occurs when load start.lua")
    print("==================================================")
    print("\t",errMsg)
    print("==================================================")
end

$ lua  main.lua
some error occurs when load start.lua
==================================================
		start.lua:7: 'then' expected near 'print'
==================================================