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<?php class Hello { public function __toString() { return null; } } $h = new Hello(); echo " First " . $h->__toString() . "\n"; echo " Second " . $h . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: Hello::__toString(): Return value must be of type string, null returned in /in/m6LMI:6 Stack trace: #0 /in/m6LMI(11): Hello->__toString() #1 {main} thrown in /in/m6LMI on line 6
Process exited with code 255.

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