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<?php $a = [1,2,5]; $b = 3; $a = array_merge($a,$b); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, int given in /in/par9V:6 Stack trace: #0 /in/par9V(6): array_merge(Array, 3) #1 {main} thrown in /in/par9V on line 6
Process exited with code 255.

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