// WITH_RUNTIME
// INTENTION_TEXT: "Replace with 'filterNot{}.mapIndexed{}.firstOrNull{}'"
// INTENTION_TEXT_2: "Replace with 'asSequence().filterNot{}.mapIndexed{}.firstOrNull{}'"
fun foo(list: List<String>): Int? {
    <caret>return list
        .filterNot { it.isBlank() }
        .mapIndexed { index, s -> s.length * (index + 1) }
        .firstOrNull { it > 0 }
}