在DolphinDB database中执行以下代码：
infos = []
info = dict(INT,INT)
info[1] = 1
infos.append!(info)
infos.append!(info)
def modify(mutable d){
d[0] = 4
}
modify(infos[0])
报错:
modify(infos[0]) => modify: d[0] = 4 => Object without ownership could not be modified.
