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I think it's fair to say that rust is the first mainstream languages bringing these notions out of the woods. Who on earth knows about ML or cyclone ? 0.0001% of the programming crowd maybe.

World operates in spirals. We branch off trying things and then go back to old forgotten ideas, etc etc

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Kotlin has sealed classes which are basically the same as Rust's enums. It also has async / await in the form of coroutines and a decent module system. It also doesn't need manual memory management, which while unsuitable for many applications does remove another potential class of bugs.

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