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<?php $a = 100; $b = $a; $a = null; var_dump(is_set($a)); var_dump($b);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function is_set() in /in/nMWSj:8 Stack trace: #0 {main} thrown in /in/nMWSj on line 8
Process exited with code 255.

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