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<?php $fn = $foo(...); var_dump($fn('strlen'));
Output for git.master, git.master_jit
Warning: Undefined variable $foo in /in/UWfCn on line 3 Fatal error: Uncaught Error: Value of type null is not callable in /in/UWfCn:3 Stack trace: #0 {main} thrown in /in/UWfCn on line 3
Process exited with code 255.

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