I was looking for the example proxy around http.ResponseWriter the author talked about which is implemented in Goji, I believe it's this code: https://github.com/zenazn/goji/blob/master/graceful/middlewa...

I understand it fine except this bit right at the end:

    var _ http.CloseNotifier = &fancyWriter{}
    var _ http.Flusher = &fancyWriter{}
    var _ http.Hijacker = &fancyWriter{}
    var _ io.ReaderFrom = &fancyWriter{}

What's the purpose of this ? According to effective go this just silences the unused imports but I don't think there's a need for that here.