def _generate_union_tag_property(self, union):
        """Emits union instance property representing union state."""
        self.emit_wrapped_text(
            'Represents the union\'s current tag state.',
            prefix=comment_prefix)
        self.emit(
            fmt_property_str(
                prop='tag', typ='{}'.format(fmt_enum_name('tag', union))))
        self.emit()
Emits union instance property representing union state.