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<?php $a = "foo"; $b =& $a[2];
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Cannot create references to/from string offsets in /in/DhVGc:3 Stack trace: #0 {main} thrown in /in/DhVGc on line 3
Process exited with code 255.

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