Macro compio_buf::buf_try

macro_rules! buf_try {
    ($e:expr) => { ... };
    ($e:expr, $b:expr) => { ... };
}

A helper macro to imitate the behavior of try trait ?.

fn foo() -> BufResult<i32, i32> {
    let (a, b) = buf_try!(BufResult(Ok(1), 2));
    assert_eq!(a, 1);
    assert_eq!(b, 2);
    (Ok(3), 4).into()
}
assert!(foo().is_ok());