Fibonacci Sequence in Kotlin

gistfile1.kt

import java.math.BigInteger
import kotlin.math.plus

fun main(args: Array<String>) {
    fibo().take(10).forEach { println(it) }
}

private fun fibo() : FunctionStream<BigInteger> {
    var cur = BigInteger.ZERO
    var next = BigInteger.ONE
    return FunctionStream({() ->
        val ret = cur
        cur = next
        next = next plus ret
        ret
    })
}