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<?php var_dump(count(new CallbackFilterIterator(new ArrayIterator([1,2,3,4], function ($i) { return $i % 2; }))));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: ArrayIterator::__construct(): Argument #2 ($flags) must be of type int, Closure given in /in/SVluR:3 Stack trace: #0 /in/SVluR(3): ArrayIterator->__construct(Array, Object(Closure)) #1 {main} thrown in /in/SVluR on line 3
Process exited with code 255.

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