unwrap_to

A simple utility macro that allows you to easily unwrap a ADT(Algebraic Data Type) enum into a reference of its inner type.

#[macro_use] extern crate unwrap_to;
//!
enum Rule {
    String(String),
    Number(u64),
}
//!
fn main() {
    let rule = Rule::Number(7);
    assert_eq!(&7, unwrap_to!(rule => Rule::Number));
}