redef fun add_code(v, block) do
		if block isa BlockFence and block.meta != null then
			v.add "~~~{block.meta.as(not null).to_s}"
		else
			v.add "~~~"
		end
		v.addn
		v.emit_in block
		v.add "~~~"
		v.addn
	end

	redef fun add_code(v, block) do
		var meta = block.meta
		if meta != null then
			v.add "<pre class=\""
			append_value(v, meta)
			v.add "\"><code>"
		else
			v.add "<pre><code>"
		end
		v.emit_in block
		v.add "</code></pre>\n"
	end

	redef fun add_code(v, block) do
		v.add ".RS\n.nf\n\\f[C]\n"
		v.emit_in block
		v.addn
		v.add "\\f[]\n.fi\n.RE\n"
	end

	redef fun add_code(v, block) do
		v.add "<code>"
		v.emit_in block
		v.add "</code>"
	end

	redef fun add_code(v, block) do
		super
		check_res(block)
	end