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<?php if (false) { echo (2)::class; }
Output for 7.1.25, 7.2.0 - 7.2.14, 7.3.0 - 7.3.2

Process exited with code 139.
Output for 7.2.15
Fatal error: Illegal class name in /in/qLvnT on line 3
Process exited with code 255.
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149.11 ms | 1165 KiB | 6 Q