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<?php class Whatever { public function readMe(Whatever $arg) { if ($arg === null) { echo 'no way'; } else { echo 'bla bla'; } } } $whatever = new Whatever(); $nothing = null; $whatever->readMe($whatever); $whatever->readMe($nothing);
Output for git.master, git.master_jit, rfc.property-hooks
bla bla Fatal error: Uncaught TypeError: Whatever::readMe(): Argument #1 ($arg) must be of type Whatever, null given, called in /in/GX4U2 on line 13 and defined in /in/GX4U2:4 Stack trace: #0 /in/GX4U2(13): Whatever->readMe(NULL) #1 {main} thrown in /in/GX4U2 on line 4
Process exited with code 255.

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