Macro numerical_enum

macro_rules! numerical_enum {
    (
        $(#[$attr:meta])*
        $vis:vis enum $enum_name:ident as $repr:tt {
            $(
                $(#[$id_attr:meta])*
                $identifier:ident = $value:expr,
            )+
        }
    ) => { ... };
}

Implements TryFrom for enums from their numerical representation.