l1.Close()
		checkExists(t, "after FileListener close")
		l.Close()
		checkNotExists(t, "after Listener close")
	})

	// Only first call to l.Close should remove.
	t.Run("SecondClose", func(t *testing.T) {
		l := listen(t)
		checkExists(t, "after Listen")
		l.Close()
		checkNotExists(t, "after Listener close")
		if err := os.WriteFile(name, []byte("hello world"), 0666); err != nil {