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<?php $arr = [@foo => 'bar']; echo $arr[@foo];
Output for rfc.property-hooks, git.master, git.master_jit
Fatal error: Uncaught Error: Undefined constant "foo" in /in/sQig0:3 Stack trace: #0 {main} thrown in /in/sQig0 on line 3
Process exited with code 255.

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