# Common code for runtime injected calls and normal calls
	fun send_commons(mproperty: MMethod, args: Array[Instance], mtype: MType): nullable Instance
	do
		if mtype isa MNullType then
			if mproperty.name == "==" or mproperty.name == "is_same_instance" then
				return self.bool_instance(args[0] == args[1])
			else if mproperty.name == "!=" then
				return self.bool_instance(args[0] != args[1])
			end
			#fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
			fatal("Receiver is null")
		end
		return null
	end