Any news on nested typealiases?

Language Design
1

These work in Swift without much problem but apparently aren’t allowed in Kotlin. I guess years ago there was some problem with implementing them. Has anything changed?

They seem useful for simplifying and not repeating long-winded generic or function types inside a class/object implementation.

class Foo<T> {
    typealias Formatter = (Int, String) -> String
    typealias MyMap = HashMap<String, List<T>>
    ...
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