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<?php function makeLouder($fn) { return function($a) use($fn) { return $fn($a)."!!!"; }; } $foo = makeLouder(abs()); echo "<p>".$foo(900)."<br/>".$foo(-900); $bar = makeLouder(strtoupper()); echo "<p>".$bar("upper");
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: abs() expects exactly 1 argument, 0 given in /in/2EkTX:7 Stack trace: #0 /in/2EkTX(7): abs() #1 {main} thrown in /in/2EkTX on line 7
Process exited with code 255.

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