将[CustomStruct]转换为[Any]

Question

我正在尝试使用自定义Struct投射数组到[Any]。

struct CustomStruct {}
var cs_array = [CustomStruct]() 
var arr: [Any] = cs_array as [Any]

我收到错误：CustomStruct is not equal to Any 我无法弄清楚为什么会这样。如果我让CustomStruct成为一个有效的课程。