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<?php $foo = new class {private $bar = '2';}; var_dump(serialize($foo));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Exception: Serialization of 'class@anonymous' is not allowed in /in/eUoup:4 Stack trace: #0 /in/eUoup(4): serialize(Object(class@anonymous)) #1 {main} thrown in /in/eUoup on line 4
Process exited with code 255.

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