// Let's assume c is an IMAP client
var c *client.Client

// Select a mailbox
if _, err := c.Select("INBOX", false); err != nil {
	log.Fatal(err)
}

idleClient := idle.NewClient(c)

// Create a channel to receive mailbox updates
updates := make(chan client.Update)
c.Updates = updates

// Start idling
done := make(chan error, 1)
go func() {
	done <- idleClient.IdleWithFallback(nil, 0)
}()

// Listen for updates
for {
	select {
	case update := <-updates:
		log.Println("New update:", update)
	case err := <-done:
		if err != nil {
			log.Fatal(err)
		}
		log.Println("Not idling anymore")
		return
	}
}

s.Enable(idle.NewExtension())