pub trait LocalHitProxyInterface: Send + Sync {
type UpgradeResponseFut: Future<Output = Result<(Option<ClientEnd<TouchSourceWithLocalHitMarker>>, Option<Box<ErrorForLocalHit>>), Error>> + Send;
// Required method
fn upgrade(
&self,
original: ClientEnd<TouchSourceMarker>,
) -> Self::UpgradeResponseFut;
}