# File lib/less/engine/nodes/element.rb, line 244
        def call args = []
          if e = @rules.find {|r| r.is_a? Element }
            raise CompileError, "#{e} in #{self.inspect}: can't nest selectors inside a dynamic mixin."
          end

          env = Element.new

          @params.zip(args).each do |param, val|
            env << (val ? Variable.new(param.to_s, Expression.new([val])) : param)
          end

          #b ? Node::Variable.new(a.to_s, Expression.new([b])) : a

#          puts "#{self.inspect}"
#          puts "env: #{env.variables}      root?: #{env.root?}"
#          puts "\nTOCSS"
          to_css([], env)
        end