【进阶实战】Lua环检测：装备继承链的死循环防护

local function root(item)
    while item.base do
        item = item.base             -- A吃B、B吃A，永不停
    end
    return item
end

local function root(item)
    local seen = {}
    while item.base do
        if seen[item] then
            return nil, "环"          -- 再次遇到即在环上
        end
        seen[item] = true
        item = item.base
    end
    return item
end
sendmsg(actor, 1, "裁决之杖链源：" .. tostring(root(W)))