俱舍論記 6.205

6.205

「如契經言至可言獲得」者，說一切有部引經通難。苾芻獲得現法涅槃，現身得故，名現法涅槃。既獲得涅槃，可言屬得。復責彼言：如何非有可言獲得？

Regarding "As the sutra says ... can be spoken of as attained": the Sarvāstivāda cites a sutra to resolve the objection. "A bhikṣu attains nirvāṇa in the present life (dṛṣṭa-dharma)"—because it is attained in the present body, it is called nirvāṇa in the present life. Since one has attained nirvāṇa, it can be spoken of as belonging to acquisition. They further question the other, saying: How could a non-existent thing be spoken of as attained?