compiler/fir/analysis-tests/testData/resolve/fib.kt

// RUN_PIPELINE_TILL: BACKEND
fun fibIterative(n: Int): Int {
    if (n < 2) return 1
    var current = 1
    var prev = 1
    for (i in 2..n) {
        val temp = current
        current += prev
        prev = temp
    }
    return current
}