class RuboCop::Cop::Metrics::Utils::CodeLengthCalculator

def line_numbers_of_inner_nodes(node, *types)
  line_numbers = Set.new
  node.each_descendant(*types) do |inner_node|
    line_range = line_range(inner_node)
    line_numbers.merge(line_range)
  end
  line_numbers.to_a
end