You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: oneshot.rs
    path of file: ./repos/phaser/phaser/vendor/hyper/src/service
    
    the code of the file until where you have to start completion: // TODO: Eventually to be replaced with tower_util::Oneshot.

use pin_project_lite::pin_project;
use tower_service::Service;

use crate::common::{task, Future, Pin, Poll};

pub(crate) fn oneshot<S, Req>(svc: S, req: Req) -> Oneshot<S, Req>
where
    S: Service<Req>,
{
    Oneshot {
        state: State::NotReady { svc, req },
    }
}

pin_project! {
    // A `Future` consum
    
    fn poll(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
        let mut me = self.project();

        loop {
            match me.state.as_mut().project() {
                StateProj::NotReady { ref mut svc, .. } => {
                    ready!(svc.poll_ready(cx))?;
                    // fallthrough out of the match's borrow
                }
                StateProj::Called { fut } => {
                    return fut.poll(cx);
                }
                StateProj::Tmp => unreachable!(),
            }

            match me.state.as_mut().project_replace(State::Tmp) {
                StateProjOwn::NotReady { mut svc, req } => {
                    me.state.set(State::Called { fut: svc.call(req) });
                }
                _ => unreachable!(),
            }
        }
    }