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<?php class User {} interface UserFinder { function findUserByEmail(): ?User; } class AlwaysNullUserFinder implements UserFinder { function findUserByEmail(): never { throw new Exception('Not implemented'); } } $a = new AlwaysNullUserFinder; $a->findUserByEmail();
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Fatal error: Uncaught Exception: Not implemented in /in/4SaN7:13 Stack trace: #0 /in/4SaN7(18): AlwaysNullUserFinder->findUserByEmail() #1 {main} thrown in /in/4SaN7 on line 13
Process exited with code 255.
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30
Fatal error: Could not check compatibility between AlwaysNullUserFinder::findUserByEmail(): never and UserFinder::findUserByEmail(): ?User, because class never is not available in /in/4SaN7 on line 11
Process exited with code 255.

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