// === Helper Macros ==

Comma<T>: Vec<T> = {
    <v:(<T> ",")*> <e:T?> => match e {
        None=> v,
        Some(e) => {
            let mut v = v;
            v.push(e);
            v
        }
    }
};

Dotted<T>: Vec<T> = {
    <v:(<T> ".")*> <e:T?> => match e {
        None=> v,
        Some(e) => {
            let mut v = v;
            v.push(e);
            v
        }
    }
};