// IMPORTANT!
// Please, when your changes cause failures in bytecodeText tests for 'for' loops,
// examine the resulting bytecode shape carefully.
// Range and progression-based loops generated with Kotlin compiler should be
// as close as possible to Java counter loops ('for (int i = a; i < b; ++i) { ... }').
// Otherwise it may result in performance regression due to missing HotSpot optimizations.
// Run Kotlin compiler benchmarks (https://github.com/Kotlin/kotlin-benchmarks)
// with compiler built from your changes if you are not sure.

val xs = listOf("a", "b", "c", "d").asSequence()

fun box(): String {
    val s = StringBuilder()

    for ((i, _) in xs.withIndex()) {
        s.append("$i;")
    }

    val ss = s.toString()
    return if (ss == "0;1;2;3;") "OK" else "fail: '$ss'"
}

// 0 withIndex
// 1 iterator
// 1 hasNext
// 1 next
// 0 component1
// 0 component2

// The 1st ICONST_0 is for initializing the list. 2nd is for initializing the index in the lowered for-loop.
// 2 ICONST_0

// 3 ILOAD
// 3 ISTORE
// 1 IADD
// 0 ISUB
// 0 IINC
