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<?php call_user_func($a = function () use (&$a) {list(, $a) = debug_backtrace(false); echo '.'; $a();});
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 1 in /in/uH2h4 on line 2 . Fatal error: Uncaught Error: Value of type null is not callable in /in/uH2h4:2 Stack trace: #0 /in/uH2h4(2): {closure}() #1 {main} thrown in /in/uH2h4 on line 2
Process exited with code 255.

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