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<?php call_user_func(2, '123');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, no array or string given in /in/DRIVm:3 Stack trace: #0 {main} thrown in /in/DRIVm on line 3
Process exited with code 255.

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