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<?php $arr = array(); $arr += array_fill_keys(null, true);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_fill_keys(): Argument #1 ($keys) must be of type array, null given in /in/SJ0BT:3 Stack trace: #0 /in/SJ0BT(3): array_fill_keys(NULL, true) #1 {main} thrown in /in/SJ0BT on line 3
Process exited with code 255.

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