class RuboCop::Cop::Performance::RedundantMerge

def on_send(node)
  each_redundant_merge(node) do |redundant_merge_node|
    message = message(node)
    add_offense(redundant_merge_node, message: message) do |corrector|
      redundant_merge_candidate(node) do |receiver, pairs|
        new_source = to_assignments(receiver, pairs).join("\n")
        if node.parent && pairs.size > 1
          correct_multiple_elements(corrector, node, node.parent, new_source)
        else
          correct_single_element(corrector, node, new_source)
        end
      end
    end
  end
end