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<?php function foo(array &$x = array()){} $x = array(); foo($x[]); foo($x[]); foo($x[]); foo($x[]); var_dump($x);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: foo(): Argument #1 ($x) must be of type array, null given, called in /in/ik1HB on line 6 and defined in /in/ik1HB:2 Stack trace: #0 /in/ik1HB(6): foo(NULL) #1 {main} thrown in /in/ik1HB on line 2
Process exited with code 255.

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