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<?php $bad_function = "echo"; $good_function = "printf"; $good_function('omg'); $bad_function('omg');
Output for git.master, git.master_jit, rfc.property-hooks
omg Fatal error: Uncaught Error: Call to undefined function echo() in /in/Dsdns:7 Stack trace: #0 {main} thrown in /in/Dsdns on line 7
Process exited with code 255.

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