class Sass::Tree::RuleNode

def to_sass(tabs, opts = {})
  name = rules.first
  name = "\\" + name if name[0] == ?:
  str = "\n#{'  ' * tabs}#{name}#{children.any? { |c| c.is_a? PropNode } ? "\n" : ''}"
  children.each do |child|
    str << "#{child.to_sass(tabs + 1, opts)}"
  end
  str
end