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: main.rs
    path of file: ./repos/code/ch3/fileresult/src
    
    the code of the file until where you have to start completion: use rand::prelude::*;                      // <1>

fn one_in(denominator: u32) -> bool {      // <2>
  thread_rng().gen_ratio(1, denominator)   // <3>
}

#[derive(Debug)]
struct File {
  name: String,
  data: Vec<u8>,
}

impl File {
  fn new(name: &str) -> File {
    File {
 
    
fn main() {
  let f4_data: Vec<u8> = vec![114, 117, 115, 116, 33];
  let mut f4 = File::new_with_data("4.txt", &f4_data);

  let mut buffer: Vec<u8> = vec![];

  f4 = open(f4).unwrap();                          // <9>
  let f4_length = f4.read(&mut buffer).unwrap();   // <9>
  f4 = close(f4).unwrap();                         // <9>

  let text = String::from_utf8_lossy(&buffer);

  println!("{:?}", f4);
  println!("{} is {} bytes long", &f4.name, f4_length);
  println!("{}", text);
}