// WITH_RUNTIME
// INTENTION_TEXT: "Replace with 'mapIndexed{}.firstOrNull{}'"
// INTENTION_TEXT_2: "Replace with 'asSequence().mapIndexed{}.firstOrNull{}'"
fun foo(list: List<String>): Int? {
    <caret>return list
        .asSequence()
        .mapIndexed { index, s -> s.length * index }
        .firstOrNull { it > 0 }
}