result.rs

struct FooResult {
  good: Option<String>,
  bad:  Option<String>
}

impl FooResult {
  fn new(result: Result<String, String>) -> FooResult {
    match result {
      Ok(ok)   => FooResult { good: Some(ok),   bad: None },
      Err(err) => FooResult { good: None, bad: Some(err)  }
    }
  }
}

#[test]
fn result() {
  let r : Result<String, String> = Ok("foobar".to_string());

  let foo = FooResult::new(r);
}