Macro make_struct 

macro_rules! make_struct {
    ($c_type: ty,
    $(#[$outer:meta])*
     $sv:vis struct $name:ident $(<$($attr:tt),+>)? {
        $(
            $(#[$inner:ident $($args:tt)*])*
            $vis:vis $v:ident :  $t:ty,
        )*
    }) => { ... };
}