coroutine.resume crash unity about slua HOT 7 CLOSED

            string resumefunc = @"
local resume = coroutine.resume
local unpack = unpack or table.unpack
coroutine.resume=function(co,...)
    local ret={resume(co,...)}
    if not ret[1] then UnityEngine.Debug.LogError(debug.traceback(co,ret[2])) end
    return unpack(ret)
end
";

function main()
    local co
    co = coroutine.create(function()
        dofile "test"
    end)
    coroutine.resume(co)
end

if not ret[1] then UnityEngine.Debug.LogError(debug.traceback(co,ret[2])) end 

if not ret[1] then pcall(function() UnityEngine.Debug.LogError(debug.traceback(co,ret[2])) end) end