public class Foo implements Comparable<Foo> {
    @Override
    public int compareTo(Foo this, @NotNull final Foo o) {
        return 0;
    }
}

class ArrayBuilder {
    @Suppress("UNCHECKED_CAST")
	operator inline fun<reified T> get(vararg items:T):Array<T> = items as Array<T>
}
val array = ArrayBuilder()

fun darkMagic() {
	array[1,2,3]
}

interface Config {
    [prop: string]: boolean;
}

declare const options: Config;

// Used to be an error, now allowed!
if (options.debugMode) {
    // ...
}

-sources

stdlib

_

coroutine