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<?php $a = [1]; $a[] = &$a[out(count($a) - 1)]; var_dump($a); function out($what) { var_dump($what); return $what; }
Output for git.master, git.master_jit, rfc.property-hooks
int(0) array(2) { [0]=> &int(1) [1]=> &int(1) }

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