Function serve_async_concurrent 

pub async fn serve_async_concurrent<S, H>(
    stream: S,
    limit: impl Into<Option<usize>>,
    handler: H,
) -> Result<(), Error>
where
    S: RequestStream,
    S::Ok: 'static + Send,
    H: AsyncRequestHandler<S::Protocol> + 'static,

Serves all requests on stream concurrently using handler.

Stops and returns an error if a FIDL error occurs while reading a request, or if handler fails. The caller should log this error.