Jokes apart. I don't see any registering code in RTIC itself. This is the rtic_sync::channel::Receiver::recv()

    
```
/// Receives a value, waiting if the queue is empty.
    /// If all senders are dropped this will error with `NoSender`.
    pub async fn recv(&mut self) -> Result<T, ReceiveError> {
        // There was nothing in the queue, setup the waiting.
        poll_fn(|cx| {
            // Register waker.
            // TODO: Should it happen here or after the if? This might cause a spurious wake.
            self.0.receiver_waker.register(cx.waker());

            // Try to dequeue.
            match self.try_recv() {
                Ok(val) => {
                    return Poll::Ready(Ok(val));
                }
                Err(ReceiveError::NoSender) => {
                    return Poll::Ready(Err(ReceiveError::NoSender));
                }
                _ => {}
            }

            Poll::Pending
        })
        .await
    }
```

It registers the waker at `self.0.receiver_waker.register(cx.waker());` but I can't figure out what it is.