Macro ast_struct 

macro_rules! ast_struct {
    (
        $(#[$attr:meta])*
        pub struct $name:ident #full $($rest:tt)*
    ) => { ... };
    (
        $(#[$attr:meta])*
        pub struct $name:ident #manual_extra_traits $($rest:tt)*
    ) => { ... };
    (
        $(#[$attr:meta])*
        pub struct $name:ident $($rest:tt)*
    ) => { ... };
}