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<?php set_error_handler(function (int $code, string $message, string $file, int $line) : never { throw new ErrorException($message, $code, E_NOTICE, $file, $line); }, ~0); try { $zero(); } catch (Throwable $thrown) { var_dump((string) $thorwn); } ?>
Output for 8.4.1 - 8.4.8
Fatal error: Uncaught ErrorException: Undefined variable $thorwn in /in/l7KWL:8 Stack trace: #0 /in/l7KWL(8): {closure:/in/l7KWL:2}(2, 'Undefined varia...', '/in/l7KWL', 8) #1 {main} thrown in /in/l7KWL on line 8
Process exited with code 255.
Output for 8.2.0 - 8.2.28, 8.3.0 - 8.3.22
Fatal error: Uncaught ErrorException: Undefined variable $thorwn in /in/l7KWL:8 Stack trace: #0 /in/l7KWL(8): {closure}(2, 'Undefined varia...', '/in/l7KWL', 8) #1 {main} thrown in /in/l7KWL on line 8
Process exited with code 255.

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