class RuboCop::Cop::Performance::Count

def on_send(node)
  count_candidate?(node) do |selector_node, selector, counter|
    return unless eligible_node?(node)
    range = source_starting_at(node) do
      selector_node.loc.selector.begin_pos
    end
    add_offense(range, message: format(MSG, selector: selector, counter: counter)) do |corrector|
      autocorrect(corrector, node, selector_node, selector)
    end
  end
end