Macro make_proj_elim

macro_rules! make_proj_elim {
    ($mod:ident, $( #[ $ty_attr:meta ] )* $vis:vis struct $ty:ident {
        $( $( #[$( $constr_attr:tt )*] )* $field_vis:vis $constr:ident : $arg_ty:ty ),* $(,)?
    }) => { ... };
}