Macro roles_template 

macro_rules! roles_template {
    () => { ... };
    (
        roles { $($role:expr $( => updaters: $updaters:expr)?;)* },
        methods { $($method:expr => $entry:expr; )* }
    ) => { ... };
    ( methods { $($method:expr => $entry:expr;)* }) => { ... };
}