from_error_scope::trys!

macro_rules! trys {
    ($tr:expr, $expr:expr) => (match $expr {
        ::std::result::Result::Ok(val) => val,
        ::std::result::Result::Err(err) => {
            return ::std::result::Result::Err($tr.from_error(err))
        }
    })
}

A try! like macro that takes an additional type argument for a type that implements FromErrorScope. You may wish to wrap this macro for a specific error scope, to shorten invocations.