class RuboCop::Cop::Style::Attr

def autocorrect(node)
  @corrections << lambda do |corrector|
    corrector.replace(node.loc.selector, 'attr_reader')
  end
end

def on_send(node)
  return unless command?(:attr, node)
  _receiver, _method_name, *args = *node
  add_offense(node, :selector) if args.any?
end