// WITH_RUNTIME
// INTENTION_TEXT: "Replace with 'mapIndexedNotNull{}.mapTo(){}'"
// INTENTION_TEXT_2: "Replace with 'asSequence().mapIndexedNotNull{}.mapTo(){}'"
fun foo(list: List<String?>, target: MutableList<String>) {
    <caret>list
        .mapIndexedNotNull { index, s -> s?.substring(index)?.length }
        .mapTo(target) { it.toString() }
}