Flat `use` in Kotlin

Test.kt

fun test() {
    val lines = use {
        val a = File("path1").reader().use
        val b = File("path2").reader().use
        val c = File("path3").reader().use
        a.readLines() + b.readLines() + c.readLines()
    }
}

Utils.kt

inline fun <T> use(block: UseBlock.() -> T): T = UseBlock().run { block().also { closeAll() } }

class UseBlock @PublishedApi internal constructor() {
    private val closeables = mutableListOf<Closeable>()

    @PublishedApi internal fun closeAll() {
        closeables.forEach(Closeable::close)
    }

    val <T : Closeable> T.use: T get() = also { closeables.add(it) }
}