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kotlinlang

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Am I doing something wrong?
I defined a var in the constructor. The var is used by the parent constructor. I can use the value. But when I try to update it, it says val can't be reassigned.. but it isn't a val

This is because you are writing a lambda that  is passed to the superclass constructor, in the constructor of your class.
In this context, the compiler thinks you are referring to the constructor param named `currentState`  and not the property of the same name.
If you want to reference the property, apply the "Assign to property" suggestion of the IDE to introduce `this`.