def create_field_ref(self, class_: str, field: str, descriptor: str) \
            -> FieldReference:
        """
        Creates a new :class:`ConstantFieldRef`, adding it to the pool and
        returning it.

        :param class_: The name of the class to which `field` belongs.
        :param field: The name of the field.
        :param descriptor: The descriptor for `field`.
        """
        self.append((
            9,
            self.create_class(class_).index,
            self.create_name_and_type(field, descriptor).index
        ))
        return self.get(self.raw_count - 1)