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: fuse.rs
    path of file: ./repos/tokio/tokio-stream/src/stream_ext
    
    the code of the file until where you have to start completion: use crate::Stream;

use pin_project_lite::pin_project;
use std::pin::Pin;
use std::task::{Context, Poll};

pin_project! {
    /// Stream returned by [`fuse()`][super::StreamExt::fuse].
    #[derive(Debug)]
    pub struct Fuse<T> {
        #[pin]
        stream: Option<T>,
    }
}

impl<T> Fuse<T>
where
    T: Stream,
{
    pub(crate) fn new(stream: T) -> Fuse<T> {
        Fuse {
            stream: Some(strea
    
    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<T::Item>> {
        let res = match Option::as_pin_mut(self.as_mut().project().stream) {
            Some(stream) => ready!(stream.poll_next(cx)),
            None => return Poll::Ready(None),
        };

        if res.is_none() {
            // Do not poll the stream anymore
            self.as_mut().project().stream.set(None);
        }

        Poll::Ready(res)
    }