# Escape additionnal characters
	# The result might no be legal in C but be used in other languages
	#
	# ~~~
	# assert "ab|\{\}".escape_more_to_c("|\{\}") == "ab\\|\\\{\\\}"
	# assert "allo???!".escape_more_to_c("")     == "allo??\\?!"
	# ~~~
	fun escape_more_to_c(chars: String): String
	do
		var b = new Buffer
		for c in escape_to_c.chars do
			if chars.chars.has(c) then
				b.add('\\')
			end
			b.add(c)
		end
		return b.to_s
	end