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<?php $g = function ($c) use (&$g) { if ($c == 100) return 0; return $g($c + 1); }; var_dump($c(0));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $c in /in/r8Y4A on line 7 Fatal error: Uncaught Error: Value of type null is not callable in /in/r8Y4A:7 Stack trace: #0 {main} thrown in /in/r8Y4A on line 7
Process exited with code 255.

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