fun takingUnaryClosure(closure: Closure<*>) =
        require(closure.call("foo") == "result from single parameter foo") { "unary closure" }

    fun takingBinaryClosure(closure: Closure<*>) =
        require(closure.call("foo", "bar") == "result from parameters foo and bar") { "binary closure" }
}

// tag::kotlinClosure[]
somePlugin {

    // Adapt parameter-less function