Function hyper_util::server::conn::auto::upgrade::downcast

pub fn downcast<T>(upgraded: Upgraded) -> Result<Parts<T>, Upgraded>
where
    T: Read + Write + Unpin + 'static,

Tries to downcast the internal trait object to the type passed.

On success, returns the downcasted parts. On error, returns the Upgraded back. This is a kludge to work around the fact that the machinery provided by [hyper_util::server::con::auto] wraps the inner T with a private type that is not reachable from outside the crate.

This kludge will be removed when this machinery is added back to the main hyper code.