A modern programming language that makes developers happier.

kotlinlang

but then maybe my ideal world would have `foo: String` and `foo: mut String`, and no `val` and `var` :stuck_out_tongue:

I think Rust got a ton of stuff right. Mutability for sure. `val` and `var` are okay, but the equal lengths means that you're still making a choice every time you declare a variable. IMO all variables should be immutable, and you should only have to make a choice when you choose to make it mutable. And it should be considerably less nice-looking to make a variable mutable so that the intentions are clear :stuck_out_tongue:

Rust also has interior immutability, which is a huge win IMO, and something that was very well-received during the Kotlin feature request survey, but I don't know if we could ever have that realistically

I agree that Rust has tons of things right, but I think many of its immutability guarantees would be impossible to implement on the JVM.