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<?php function f(&$x) {echo $x;} $x = 1; f([1, 2]); echo $x;
Output for git.master, git.master_jit
Fatal error: Uncaught Error: f(): Argument #1 ($x) could not be passed by reference in /in/Ur5Z4:4 Stack trace: #0 {main} thrown in /in/Ur5Z4 on line 4
Process exited with code 255.
Output for rfc.property-hooks
Fatal error: Uncaught Error: f(): Argument #1 ($x) cannot be passed by reference in /in/Ur5Z4:4 Stack trace: #0 {main} thrown in /in/Ur5Z4 on line 4
Process exited with code 255.

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