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<?php class A { function __toString() { return 'A'; } } $a = new A(); $b = [$a => $a]; print_r($b);
Output for git.master_jit, git.master
Fatal error: Uncaught TypeError: Cannot access offset of type A on array in /in/4teSv:11 Stack trace: #0 {main} thrown in /in/4teSv on line 11
Process exited with code 255.

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