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<?php $var = null; $isset = isset($var); $isnull = isnull($var); var_dump($isset); var_dump($isnull);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function isnull() in /in/67Bjf:4 Stack trace: #0 {main} thrown in /in/67Bjf on line 4
Process exited with code 255.

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