// WITH_RUNTIME
// INTENTION_TEXT: "Replace with 'flatMapTo(){}'"
// INTENTION_TEXT_2: "Replace with 'asSequence().flatMapTo(){}'"
fun foo(list: List<String>, target: MutableList<String>) {
    <caret>list
        .asSequence()
        .flatMapTo(target) { it.lines().asSequence() }
}