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<?php function foo(&$x) { $x = 123; } foo($bar = null); var_dump($bar);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: foo(): Argument #1 ($x) cannot be passed by reference in /in/PdME1:6 Stack trace: #0 {main} thrown in /in/PdME1 on line 6
Process exited with code 255.

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