Try or Rust macro, for more generally treating Results as values.

try_or.rs

macro_rules! try_or {
    ($expr:expr => $handler:expr) => (match $expr {
        ::std::result::Result::Ok(v) => v,
        ::std::result::Result::Err(e) => {
            warn!("{}", e);
            $handler
        }
    })
}

mod test {
    mod fixtures {
        pub fn err() -> Result<u32, u32> {
            Err(1)
        }
    }

    #[test]
    fn test_try_or_divergent() {
        try_or!(fixtures::err() => { assert!(true); return });
    }

    #[test]
    fn test_try_or_value() {
        assert_eq!(try_or!(fixtures::err() => 7), 7)
    }
}