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: try_buffered.rs
    path of file: ./repos/phaser/phaser/vendor/futures-util/src/stream/try_stream
    
    the code of the file until where you have to start completion: use crate::future::{IntoFuture, TryFutureExt};
use crate::stream::{Fuse, FuturesOrdered, IntoStream, StreamExt};
use core::pin::Pin;
use futures_core::future::TryFuture;
use futures_core::stream::{Stream, TryStream};
use futures_core::task::{Context, Poll};
#[cfg(feature = "sink")]
use fut
    
    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        let mut this = self.project();

        // First up, try to spawn off as many futures as possible by filling up
        // our queue of futures. Propagate errors from the stream immediately.
        while this.in_progress_queue.len() < *this.max {
            match this.stream.as_mut().poll_next(cx)? {
                Poll::Ready(Some(fut)) => this.in_progress_queue.push(fut.into_future()),
                Poll::Ready(None) | Poll::Pending => break,
            }
        }

        // Attempt to pull the next value from the in_progress_queue
        match this.in_progress_queue.poll_next_unpin(cx) {
            x @ Poll::Pending | x @ Poll::Ready(Some(_)) => return x,
            Poll::Ready(None) => {}
        }

        // If more values are still coming from the stream, we're not done yet
        if this.stream.is_done() {
            Poll::Ready(None)
        } else {
            Poll::Pending
        }
    }