class SyntaxTree::Undef

def format(q)
  keyword = "undef "
  formatters = symbols.map { |symbol| UndefArgumentFormatter.new(symbol) }
  q.group do
    q.text(keyword)
    q.nest(keyword.length) do
      q.seplist(formatters) { |formatter| q.format(formatter) }
    end
  end
end