``` // Boo in Kotlin val a = Boo { x: Stri...
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// Boo in Kotlin
    val a = Boo { x: String -> x.length } // doesn't work
    val a2 = object : Boo {
        override fun x(y: String): Int {
            return y.length // works
        }
    }
    // Boo2 in Java
    val b = Boo2 { it.length } // works