class RBS::AncestorGraph

def build_ancestors(node, ancestors)
  ancestors.each_ancestor do |ancestor|
    case ancestor
    when Definition::Ancestor::Instance
      register(child: node, parent: InstanceNode.new(type_name: ancestor.name))
    when Definition::Ancestor::Singleton
      register(child: node, parent: SingletonNode.new(type_name: ancestor.name))
    end
  end
end