run code in 200+ php & hhvm versions
<?php $foo = new class { public int $bar; }; var_dump($foo->bar);

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Output for Typed properties v2
Fatal error: Uncaught TypeError: Typed property class@anonymous::$bar must not be accessed before initialization in /in/cVkcj:7 Stack trace: #0 {main} thrown in /in/cVkcj on line 7
Process exited with code 255.

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