Macro codegen_self_pointer_type

macro_rules! codegen_self_pointer_type {
    {
        struct: (),
        ownership: $ownership:tt,
        type: $type:tt
    } => { ... };
    {
        struct: $struct:tt,
        ownership: { $($ownership:tt)* },
        type: $type:tt
    } => { ... };
}