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<?php class SomeClass { protected string|stdClass $a; } $unionType = (new \ReflectionClass(SomeClass::class))->getProperty('a')->getType(); var_dump($unionType->isBuiltin());
Output for git.master_jit, git.master, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined method ReflectionUnionType::isBuiltin() in /in/5BDRn:8 Stack trace: #0 {main} thrown in /in/5BDRn on line 8
Process exited with code 255.

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