option_test.rs

use std::hashmap::HashMap;

#[test]
fn test(){

  let mut omap: Option<HashMap<~str, uint>> = None;
  omap = Some(HashMap::new());
  let must_insert = false;

  {
    let map = omap.get_mut_ref();
    map.insert(~"foo", 1);

    let (v, must_insert) = match map.find_mut(&~"foo") {
      Some(c)   => (*c, false),
      None      => (0 as uint, true)
    };
  }

  if must_insert {
    omap.get_mut_ref().insert(~"bar", 2); 
  }
}

/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:10:20: 10:23 error: cannot borrow *map because it is already borrowed as mutable
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:10 None => { map.insert("bar", 2); 2 },
^~~
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:9:17: 9:20 note: previous borrow of *map as mutable occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of *map until the borrow ends
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:9 let v = match map.find_mut(&"foo") {
^~~
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:12:4: 12:4 note: previous borrow ends here
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:9 let v = match map.find_mut(&"foo") {
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:10 None => { map.insert("bar", 2); 2 },
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:11 Some(c) => 0
/Users/pzol/Dropbox/src/rust/one/src/option_test.rs:12 };
^
error: aborting due to previous error
[Finished in 0.1s with exit code 101]
[cmd: ['/usr/local/bin/rustc', '--test', '-o', '/Users/pzol/Dropbox/src/rust/one/bin/test_option_test', '/Users/pzol/Dropbox/src/rust/one/src/option_test.rs']]
[dir: /Users/pzol/Dropbox/src/rust/one/src]
[path: /usr/bin:/bin:/usr/sbin:/sbin]