lifetimes

struct BufferAndSound<'a> {
    buffer: Rc<SoundBuffer>,
    sound : Sound<'a>,
}

impl<'a> BufferAndSound<'a> {
    fn new() -> Self {
        let buffer = Rc::new(SoundBuffer::from_file("some_audio.wav").unwrap());
        let sound = Sound::with_buffer(&buffer);

        BufferAndSound {
            buffer: buffer,
            sound: sound
        }
    }
}