class Sass::Tree::RuleNode

def to_sass(tabs, opts = {})

Other tags:
    See: Node#to_sass -
def to_sass(tabs, opts = {})
  name = selector_to_sass(rule, opts)
  name = "\\" + name if name[0] == ?:
  name.gsub(/^/, '  ' * tabs) + children_to_src(tabs, opts, :sass)
end