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: fseek.rs
    path of file: ./repos/wasmer/tests/wasi-wast/wasi/tests
    
    the code of the file until where you have to start completion: // WASI:
// mapdir: .:test_fs/hamlet

use std::fs;
use std::io::{Read, Seek, SeekFrom};
use std::path::PathBuf;

fn main() {
    #[cfg(not(target_os = "wasi"))]
    let mut base = PathBuf::from("test_fs/hamlet");
    #[cfg(target_os = "wasi")]
    let mut base = PathBuf::from(".");

    base.push("act1/scene3.txt");

    let mut file = fs::File::open(&base).expect("Could not open file");

    let mut buffer = [0u8; 32];

    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.seek(SeekFrom::Start(123)).unwrap(), 123);
    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.seek(SeekFrom::End(-123)).unwrap(), 6617);
    assert_eq!(file.read(&mut b
    
fn main() {
    #[cfg(not(target_os = "wasi"))]
    let mut base = PathBuf::from("test_fs/hamlet");
    #[cfg(target_os = "wasi")]
    let mut base = PathBuf::from(".");

    base.push("act1/scene3.txt");

    let mut file = fs::File::open(&base).expect("Could not open file");

    let mut buffer = [0u8; 32];

    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.seek(SeekFrom::Start(123)).unwrap(), 123);
    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.seek(SeekFrom::End(-123)).unwrap(), 6617);
    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.seek(SeekFrom::Current(-250)).unwrap(), 6399);
    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);

    assert_eq!(file.seek(SeekFrom::Current(50)).unwrap(), 6481);
    assert_eq!(file.read(&mut buffer).unwrap(), 32);
    let str_val = std::str::from_utf8(&buffer[..]).unwrap();
    println!("{}", str_val);
}