class RuboCop::Cop::Style::RedundantSortBy

def on_block(node)

def on_block(node)
  redundant_sort_by_block(node) do |send, var_name|
    range = sort_by_range(send, node)
    add_offense(range, message: format(MSG_BLOCK, var: var_name)) do |corrector|
      corrector.replace(range, 'sort')
    end
  end
end