Macro helix::codegen_allocator

macro_rules! codegen_allocator {
    ({
        type: class,
        rust_name: $rust_name:tt,
        ruby_name: $ruby_name:tt,
        meta: $meta:tt,
        struct: (),
        methods: $methods:tt
    }) => { ... };
    ({
        type: class,
        rust_name: $rust_name:tt,
        ruby_name: $ruby_name:tt,
        meta: { pub: $pub:tt, reopen: false },
        struct: $struct:tt,
        methods: [ $($method:tt)* ]
    }) => { ... };
}