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<?php $foo = 'foo'; $bar->$foo = array(); $bar->$foo[0] = 42; var_dump($bar);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Attempt to assign property "foo" on null in /in/ksEpB:4 Stack trace: #0 {main} thrown in /in/ksEpB on line 4
Process exited with code 255.

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