# File lib/sass/tree/for_node.rb, line 24
    def to_src(tabs, opts, fmt)
      to = @exclusive ? "to" : "through"
      "#{'  ' * tabs}@for $#{dasherize(@var, opts)} from #{@from.to_sass(opts)} #{to} #{@to.to_sass(opts)}" +
        children_to_src(tabs, opts, fmt)
    end