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<?php $a = NULL; $b = clone $a; var_dump($b);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: __clone method called on non-object in /in/C2S5k:4 Stack trace: #0 {main} thrown in /in/C2S5k on line 4
Process exited with code 255.

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