Macro make_case_elim

macro_rules! make_case_elim {
    ($mod:ident, $( #[ $ty_attr:meta ] )* $vis:vis enum $ty:ident {
        $( $( #[$( $constr_attr:tt )*] )* $constr:ident $( ( $( $arg_name:ident : $arg_ty:ty ),* ) )? = $index:expr ),* $(,)?
    }) => { ... };
}