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: serial.rs
    path of file: ./repos/embassy/examples/std/src/bin
    
    the code of the file until where you have to start completion: #[path = "../serial_port.rs"]
mod serial_port;

use async_io::Async;
use embassy_executor::Executor;
use embassy_time as _;
use embedded_io_async::Read;
use log::*;
use nix::sys::termios;
use static_cell::StaticCell;

use self::serial_port::SerialPort;

#[embassy_executor::task]
async fn run() {
    // Open the serial port.
    let baudrate = termios::BaudRate::B115200;
    let port = SerialPort::new("/dev/ttyACM0", baudrate).unwrap();
    //let port = Spy::new(port);

    // Use async_io's reactor for async IO.
    // This demonstrates how embassy's executor can drive futures from another IO libr
    
async fn run() {
    // Open the serial port.
    let baudrate = termios::BaudRate::B115200;
    let port = SerialPort::new("/dev/ttyACM0", baudrate).unwrap();
    //let port = Spy::new(port);

    // Use async_io's reactor for async IO.
    // This demonstrates how embassy's executor can drive futures from another IO library.
    // Essentially, async_io::Async converts from AsRawFd+Read+Write to futures's AsyncRead+AsyncWrite
    let port = Async::new(port).unwrap();

    // We can then use FromStdIo to convert from futures's AsyncRead+AsyncWrite
    // to embedded_io's async Read+Write.
    //
    // This is not really needed, you could write the code below using futures::io directly.
    // It's useful if you want to have portable code across embedded and std.
    let mut port = embedded_io_adapters::futures_03::FromFutures::new(port);

    info!("Serial opened!");

    loop {
        let mut buf = [0u8; 256];
        let n = port.read(&mut buf).await.unwrap();
        info!("read {:?}", &buf[..n]);
    }
}