# File lib/sass/less.rb, line 202
        def to_sass_tree
          return if hide_in_sass
          mixin = Sass::Tree::MixinDefNode.new(name, @params.map do |v|
              v.value.flatten!
              [Sass::Script::Variable.new(v), v.value.to_sass_tree]
            end)
          rules.each {|r| mixin << r.to_sass_tree}
          mixin
        end