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: a.rs
    path of file: ./repos/embassy/examples/boot/application/rp/src/bin
    
    the code of the file until where you have to start completion: #![no_std]
#![no_main]

use core::cell::RefCell;

use defmt_rtt as _;
use embassy_boot_rp::*;
use embassy_executor::Spawner;
use embassy_rp::flash::Flash;
use embassy_rp::gpio::{Level, Output};
use embassy_rp::watchdog::Watchdog;
use embassy_sync::blocking_mutex::Mutex;
use embassy_time::{Duration, Timer};
use embedded_storage::nor_flash::NorFlash;
#[cfg(feature = "panic-probe")]
use panic_probe as _;
#[cfg(feature = "panic-reset")]
use panic_reset as _;

#[cfg(feature = "skip-include")]
static APP_B: &[u8] = &[0, 1, 2, 3];
#[cfg(not(feature = "skip-include"))]
static APP_B: &[u8] = include_bytes!("../../b.bin");

const FLASH_SIZE: usize = 2 * 1024 * 1024;

#[embassy_executor::main]
async fn main(_s: Spawner) {
    let p = embassy_rp::i
    
async fn main(_s: Spawner) {
    let p = embassy_rp::init(Default::default());
    let mut led = Output::new(p.PIN_25, Level::Low);

    // Override bootloader watchdog
    let mut watchdog = Watchdog::new(p.WATCHDOG);
    watchdog.start(Duration::from_secs(8));

    let flash = Flash::<_, _, FLASH_SIZE>::new_blocking(p.FLASH);
    let flash = Mutex::new(RefCell::new(flash));

    let config = FirmwareUpdaterConfig::from_linkerfile_blocking(&flash, &flash);
    let mut aligned = AlignedBuffer([0; 1]);
    let mut updater = BlockingFirmwareUpdater::new(config, &mut aligned.0);

    Timer::after_secs(5).await;
    watchdog.feed();
    led.set_high();
    let mut offset = 0;
    let mut buf: AlignedBuffer<4096> = AlignedBuffer([0; 4096]);
    defmt::info!("preparing update");
    let writer = updater
        .prepare_update()
        .map_err(|e| defmt::warn!("E: {:?}", defmt::Debug2Format(&e)))
        .unwrap();
    defmt::info!("writer created, starting write");
    for chunk in APP_B.chunks(4096) {
        buf.0[..chunk.len()].copy_from_slice(chunk);
        defmt::info!("writing block at offset {}", offset);
        writer.write(offset, &buf.0[..]).unwrap();
        offset += chunk.len() as u32;
    }
    watchdog.feed();
    defmt::info!("firmware written, marking update");
    updater.mark_updated().unwrap();
    Timer::after_secs(2).await;
    led.set_low();
    defmt::info!("update marked, resetting");
    cortex_m::peripheral::SCB::sys_reset();
}