Appending to a file has no effect, in stable

[progval]

use std::io::Read;
use std::io::Write;
use std::fs::{File, OpenOptions};

fn main() {
    let mut f = File::create("foo.txt").unwrap();
    f.write("bar".as_bytes()).unwrap();
    let mut f = OpenOptions::new().append(true).open("foo.txt").unwrap();
    let _ = f.write_all("baz".as_bytes());
    f.flush().unwrap();

    let mut f = File::open("foo.txt").unwrap();
    let mut content = String::new();
    f.read_to_string(&mut content).unwrap();
    println!("{}", content);
}

Beta and nightly's behavior: prints barbaz
Stable's behavior: prints bar

[sfackler]

If you change line 9 to not ignore errors, you'll see that it fails on stable. In stable you'd have to manually specify OpenOptions::new().write(true).. or the file is opened read-only. I believe some of the changes to the semantics of OpenOptions now make append imply write.

[alexcrichton]

I believe this is an instance of RFC 1252 and sounds like it should be "fixed" soon! Closing as working for now (as it's a fixed bug), but thanks for the report!

[progval]

Ok

@sfackler: By the way, your solution worked. Thanks