def visit_mixin(node)
unless node.args.empty? && node.keywords.empty? && node.splat.nil?
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(', ')
if node.splat
splat = (args.empty? && keywords.empty?) ? "" : ", "
splat = "#{splat}#{node.splat.to_sass(@options)}..."
end
arglist = "(#{args}#{', ' unless args.empty? || keywords.empty?}#{keywords}#{splat})"
end
"#{tab_str}#{@format == :sass ? '+' : '@include '}#{dasherize(node.name)}#{arglist}#{node.has_children ? yield : semi}\n"
end