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<?php $x = null; $y = array_merge(array('a'=>2, 'b'=>4, 'c'=>6), $x); var_dump($y);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, null given in /in/aAUGW:3 Stack trace: #0 /in/aAUGW(3): array_merge(Array, NULL) #1 {main} thrown in /in/aAUGW on line 3
Process exited with code 255.

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