fun main(args: Array<String>) {
    for (i in 0f..5f) {
        println(i)
    }
    println((0f..0f).iterator().next()) // 0.0
    println((1f..0f).iterator().next()) // throws
}

operator fun ClosedRange<Float>.iterator(): Iterator<Float> =
        object : Iterator<Float> {
            val range = this@iterator
            var next: Float = range.start
            override fun hasNext(): Boolean =
                    next <= range.endInclusive
            override fun next(): Float {
                if (next > range.endInclusive) throw NoSuchElementException()
                return next++
            }
        }