private fun recurse_to_s(depth: Int): String do
		var s = "{"\t" * depth}(\n"
		for i in content do
			if i isa SExp then
				s += i.recurse_to_s(depth + 1)
				s += "\n"
				continue
			end
			s += "\t" * (depth + 1)
			s += i.to_s
			s += "\n"
		end
		return s + "{"\t" * depth})"
	end