class Rubydex::Constant

static VALUE rdxr_constant_declaration_references(VALUE self) {
    if (!rb_block_given_p()) {
        return rb_enumeratorize_with_size(self, rb_str_new2("references"), 0, NULL,
                                          constant_declaration_references_size);
    }

    HandleData *data;
    void *graph = rdxi_graph_from_handle(self, &data);

    void *iter = rdx_declaration_constant_references_iter_new(graph, data->id);
    if (iter == NULL) {
        rb_raise(rb_eRuntimeError, "Declaration not found");
    }

    VALUE args = rb_ary_new_from_args(2, data->graph_obj, ULL2NUM((uintptr_t)iter));
    rb_ensure(rdxi_constant_references_yield, args, rdxi_constant_references_ensure, args);

    return self;
}

static VALUE rdxr_declaration_visibility(VALUE self) {
    HandleData *data;
    void *graph = rdxi_graph_from_handle(self, &data);

    const CVisibility *visibility = rdx_graph_visibility(graph, data->id);
    if (visibility == NULL) {
        rb_raise(rb_eRuntimeError, "declaration has no visibility");
    }

    VALUE symbol = rdxi_visibility_to_symbol(*visibility);
    free_c_visibility(visibility);

    return symbol;
}