# Return the position of the next line break
	#
	# We consider `\r` and `\n`.
	private fun find_line_break(input: String, start_index: Int): Int do
		for i in [start_index .. input.length[ do
			var char = input.chars[i]
			if char == '\r' or char == '\n' then return i
		end
		return -1
	end