It has no adts at all. Like I'm reading blog posts right now about how to do what should be the simplest thing

    enum Foo {
        A(String),
        B(i32),
    }

And it's.. not simple. And even if you manage to do it, it'll never be how Kotlin was meant to be written.

I've used Go for almost two years on a side project and its type system is exactly why I'm doing Rust now. In my book, it is not okay that I add a new field to a struct and then nothing happens. No compile warnings, nothing. It's just assumed that I then wanted the zeroth value whenever it's created. ... And no adts. You just can't make something as simple as

    enum Foo {
        Bar(String),
        Baz(i32),
    }

Why? It's such a fundamental thing to be able to say "this piece of data is either this or that.. and then have the compiler tell you if you missed a case.

Ada is on my list of languages to look at. I'm cautiously optimistic about that one. But would you pick that over Rust as the simpler alternative? "Look guys! We're not moving fast enough with Rust because nobody seems to be proficient in it. Let's go with Ada instead!" .. I jest, but I will check it out and I really hope it hits the sweet spot for me

go doesn't have null safety or adts though? (sum types)