class Sass::Tree::RuleNode

def to_sass(tabs, opts = {})
  str = "\n#{'  ' * tabs}#{rule}#{children.any? { |c| c.is_a? AttrNode } ? "\n" : ''}"
  children.each do |child|
    str << "#{child.to_sass(tabs + 1, opts)}"
  end
  str
end