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<?php (function(){ echo 'HAI!!'; })->call();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught ArgumentCountError: Closure::call() expects at least 1 argument, 0 given in /in/MRV49:3 Stack trace: #0 /in/MRV49(3): Closure->call() #1 {main} thrown in /in/MRV49 on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Closure::call() expects at least 1 parameter, 0 given in /in/MRV49 on line 3
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR) in /in/MRV49 on line 3
Process exited with code 255.

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