enum Bytecode {
    Nop,
    Push(i64),
    BinaryAdd,
    Print,
}
use Bytecode::*;

static CODE: &'static [Bytecode] = &[
    Push(9),
    Push(5),
    BinaryAdd,
    Print,
];

fn main() {
    let mut stack = Vec::new();

    for element in CODE {
        match *element {
            Nop => {},
            Push(x) => { stack.push(x) },
            BinaryAdd => {
                let v = stack.pop().unwrap();
                *stack.last_mut().unwrap() += v;
            },
            Print => { println!("{}", stack.pop().unwrap()); },
        }
    }
}