Macro fire_postgres::try2

macro_rules! try2 {
    ($exp:expr) => { ... };
}

Example

fn mul(maybe_num: Option<i32>) -> Result<Option<i32>, &'static str> {
	let x = try2!(maybe_num);

	x.checked_mul(2)
		.map(Some)
		.ok_or("overflow")
}