redef fun is_valid_augmentation do
		if suffix != "" then return false
		if is_code_point then return true
		if prefix != "" then return false
		return true
	end

	redef fun is_valid_augmentation do
		if is_string and suffix == "" then return true
		if is_bytestring and suffix == "" then return true
		if is_re then
			var suf = suffix
			for i in suf.chars do
				if i == 'i' then continue
				if i == 'm' then continue
				if i == 'b' then continue
				return false
			end
			return true
		end
		if prefix != "" or suffix != "" then return false
		return true
	end