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<?php var_dump(array_combine(['1','2'],[]));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ValueError: array_combine(): Argument #1 ($keys) and argument #2 ($values) must have the same number of elements in /in/8RMGi:3 Stack trace: #0 /in/8RMGi(3): array_combine(Array, Array) #1 {main} thrown in /in/8RMGi on line 3
Process exited with code 255.

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