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<?php $arr0 = new ArrayObject(['a' => 'A']); $arr1 = new ArrayObject(['x' => 'X']); var_export($arr0 + $arr1);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: Unsupported operand types: ArrayObject + ArrayObject in /in/v1GqI:5 Stack trace: #0 {main} thrown in /in/v1GqI on line 5
Process exited with code 255.

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