Macro struct

macro_rules! struct {
    (
        $( #[$meta:meta] )*
        $pub:vis struct $name:ident {
            $( $field_pub:vis $field_name:ident: $field_ty:ty ),* $(,)?
        }
    ) => { ... };
    (
        $( #[$meta:meta] )*
        $pub:vis struct $name:ident($( $inner_pub:vis $inner_ty:ty ),* $(,)? );
    ) => { ... };
    (
        $( #[$meta:meta] )*
        $pub:vis struct $name:ident;
    ) => { ... };
}