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<?php class c { public static $f; public function __construct() { var_dump(call_user_func(self::$f)); } } c:$f = function() { return 'ok'; }; new c();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, no array or string given in /in/ST9Zs:5 Stack trace: #0 /in/ST9Zs(9): c->__construct() #1 {main} thrown in /in/ST9Zs on line 5
Process exited with code 255.

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