simpleClass.kt

interface SomeInterface {
    fun foo(x: Int, y: String): String

    val bar: Boolean
}

class SomeClass : SomeInterface {
    private val baz = 42

    override fun foo(x: Int, y: String): String {
        return y + x + baz
    }

    override var bar: Boolean
        get() = true
        set(value) {}

    <!INAPPLICABLE_LATEINIT_MODIFIER!>lateinit var fau: Double<!>
}

inline class InlineClass