# File lib/sass/script/tree/funcall.rb, line 106
    def deep_copy
      node = dup
      node.instance_variable_set('@args', args.map {|a| a.deep_copy})
      copied_keywords = Sass::Util::NormalizedMap.new
      @keywords.as_stored.each {|k, v| copied_keywords[k] = v.deep_copy}
      node.instance_variable_set('@keywords', copied_keywords)
      node
    end