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<?php function add($x) { return function($y = null) use ($x) { if (is_null($y)) return $x; else return add($x + $y); }; } echo add(2)->__invoke(40);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Object of class Closure could not be converted to string in /in/l7O22:10 Stack trace: #0 {main} thrown in /in/l7O22 on line 10
Process exited with code 255.

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