# File lib/sass/tree/visitors/convert.rb, line 177
  def visit_mixin(node)
    unless node.args.empty? && node.keywords.empty?
      args = node.args.map {|a| a.to_sass(@options)}.join(", ")
      keywords = Sass::Util.hash_to_a(node.keywords).
        map {|k, v| "$#{dasherize(k)}: #{v.to_sass(@options)}"}.join(', ')
      arglist = "(#{args}#{', ' unless args.empty? || keywords.empty?}#{keywords})"
    end
    "#{tab_str}#{@format == :sass ? '+' : '@include '}#{dasherize(node.name)}#{arglist}#{semi}\n"
  end