# Collect all `TComment` contained in the production
	# (between `start_token` and `end_token`).
	private fun collect_comments: Array[TComment] do
		var res = new Array[TComment]
		if start_token == null or last_token == null then return res
		var token = start_token

		while token != last_token do
			if token isa TComment then res.add token
			token = token.next_token
		end

		return res
	end