Macro opg::impl_opg_model

macro_rules! impl_opg_model {
    (generic_simple(nullable$(, ?$sized:ident)?): $($type:tt)+) => { ... };
    (generic_simple$((?$sized:ident))?: $($type:tt)+) => { ... };
    (generic_tuple: ($($type:ident),+)) => { ... };
    (generic_array: $($type:tt)+) => { ... };
    (generic_dictionary: $($type:tt)+) => { ... };
    ($serialized_type:ident$(($format:literal))?: $($type:tt)+ ) => { ... };
    ($serialized_type:ident(always_inline$(, $format:literal)?): $($type:tt)+) => { ... };
}