class RuboCop::Cop::Style::NestedModifier

def new_expression(inner_node)
  outer_node = inner_node.parent
  operator = replacement_operator(outer_node.keyword)
  lh_operand = left_hand_operand(outer_node, operator)
  rh_operand = right_hand_operand(inner_node, outer_node.keyword)
  "#{outer_node.keyword} #{lh_operand} #{operator} #{rh_operand}"
end