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<?php print_r(array_combine(null, array()));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_combine(): Argument #1 ($keys) must be of type array, null given in /in/H81Ak:2 Stack trace: #0 /in/H81Ak(2): array_combine(NULL, Array) #1 {main} thrown in /in/H81Ak on line 2
Process exited with code 255.

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