A modern programming language that makes developers happier.

kotlinlang

Untitled.cpp

Can be achieved with this

val Y = object: {}

Although I admit, I'd expect this to work too.

Not sure what you mean, looks like working: <https://pl.kotl.in/FLNhgaKuQ|https://pl.kotl.in/FLNhgaKuQ>

In JVM, objects are compiled as classes with a private constructor and a static INSTANCE field.
If you access an object inside an object using an instance, you call X.INSTANCE.Y.INSTANCE, but you should X.Y.INSTANCE (and calling static methods on an instance is a code smell) . As `x` is `X.INSTANCE`, it could have some kind of a mutable state, but with `X.Y` it is clear, `Y` is not affected by any changes from `x`.

```object X {

    var s = 42

    object Y {
        var l = s
    }
}

fun foo() {
    println(X.Y.l)
    val x = X
    println(X.Y.l)
    x.s = 1
    println(X.Y.l)
}
foo()```

<@UHAJKUSTU>: your example is not not addressing the question.  Try <https://pl.kotl.in/9_AvaZ9w4> for yourself. For the record: I also would have expected that this works.

That is because of the poor Slack UX, I got the question wrong. Sorry.