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<?php $obj = (object)[null]; var_dump($obj, $obj->${0});
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $0 in /in/Q6AFE on line 4 Warning: Undefined property: stdClass::$ in /in/Q6AFE on line 4 object(stdClass)#1 (1) { ["0"]=> NULL } NULL

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