How to make your own support for AutoCloseable

AutoclosingKotlin.kt

class Fred : AutoCloseable {
    override fun close() {

    }
}

public fun foo() {
    Fred().use {
        // do something then autoclose
    }
}

public inline fun <T : AutoCloseable, R> T.use(block: (T) -> R): R {
    var closed = false
    try {
        return block(this)
    } catch (e: Exception) {
        closed = true
        try {
            close()
        } catch (closeException: Exception) {
            // eat the closeException as we are already throwing the original cause
            // and we don't want to mask the real exception
        }
        throw e
    } finally {
        if (!closed) {
            close()
        }
    }
}