[Kotlin]Smart cast to 'XXX' is impossible

 一、错误代码

private var nameList:MutableList<Any>?=null

fun testList(){
    nameList = mutableListOf()
    nameList.add(Any())
}

在nameList.add(Any()) 处报错，报错信息：

 

Smart cast to 'XXX' is impossible, because 'XX' is mutable property that have been changed by this time

二、解决办法

 IDEA提示信息错误，光标移至报错处，按"shift+enter"自动修复，添加非空检测。