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: mod.rs
    path of file: ./repos/quinn/quinn-proto/src/connection/streams
    
    the code of the file until where you have to start completion: use std::{
    cell::RefCell,
    collections::{hash_map, BinaryHeap, VecDeque},
};

use bytes::Bytes;
use thiserror::Error;
use tracing::trace;

use self::state::get_or_insert_recv;

u
    
    pub fn accept(&mut self, dir: Dir) -> Option<StreamId> {
        if self.state.next_remote[dir as usize] == self.state.next_reported_remote[dir as usize] {
            return None;
        }

        let x = self.state.next_reported_remote[dir as usize];
        self.state.next_reported_remote[dir as usize] = x + 1;
        if dir == Dir::Bi {
            self.state.send_streams += 1;
        }

        Some(StreamId::new(!self.state.side, dir, x))
    }