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<?php $f = function($x) use($f){ if($x==0 || $x==1) return 1; return $f($x-1) + $f($x-2); }; print $f(10);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $f in /in/cO2ER on line 3 Fatal error: Uncaught Error: Value of type null is not callable in /in/cO2ER:6 Stack trace: #0 /in/cO2ER(9): {closure}(10) #1 {main} thrown in /in/cO2ER on line 6
Process exited with code 255.

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