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kotlinlang

class `B` inherits class `A`,  I have a property `open val children = mutableListOf&lt;A&gt;` in class `X` and in class `Y` I'm trying to override `children` with `override open val children = mutableListOf&lt;B&gt;()` but IDEA is giving me `Type of 'children' is not a subtype of the overridden property 'public open val children: MutableList&lt;A&gt; defined in package.A'` is there anyway around this? or should I be taking a different approach?