main.rs

use std::io::Write;
use std::fs::OpenOptions;
use std::path::{ Path};
use std::thread;


fn main() {
  let dst = Path::new("./test.txt");
  let mut file = OpenOptions::new().write(true).create(true).open(dst).unwrap();
  file.write_all(b"create").unwrap();
  file.flush().unwrap();
  drop(file);
  thread::sleep_ms(1000); // Wait a while after create above before observing.


  let mut file2 = OpenOptions::new().write(true).append(true).open(dst).unwrap();
  file2.write_all(b"foo").unwrap();
  file2.flush().unwrap();
  drop(file2);
}