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: driver.rs
    path of file: ./repos/embassy/embassy-stm32-wpan/src/mac
    
    the code of the file until where you have to start completion: #![deny(unused_must_use)]

use core::task::Context;

use embassy_net_driver::{Capabilities, HardwareAddress, LinkState};
use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
use embassy_sync::channel::Channel;

use crate::mac::event::MacEvent;
use crate::mac::runner::Runner;
use crate::mac::MTU;

pub struct Driver<'d> {
    runner: &'d Runner<'d>,
}

impl<'d> Driver<'d> {
    pub(crate) fn new(runner: &'d Runner<'d>) -> Self {
        Self { runner: runner }
    }
}

impl<'d> embassy_n
    
    fn receive(&mut self, cx: &mut Context) -> Option<(Self::RxToken<'_>, Self::TxToken<'_>)> {
        if self.runner.rx_channel.poll_ready_to_receive(cx).is_ready()
            && self.runner.tx_buf_channel.poll_ready_to_receive(cx).is_ready()
        {
            Some((
                RxToken {
                    rx: &self.runner.rx_channel,
                },
                TxToken {
                    tx: &self.runner.tx_channel,
                    tx_buf: &self.runner.tx_buf_channel,
                },
            ))
        } else {
            None
        }
    }