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<?php /** vendor/symfony/abc */ namespace Foobar { /* private */ class Wizzbang { } } /** src/Wizzbonk.php */ namespace App { class ExternalClass { public function doStuff(): \Foobar\Wizzbang { return \Foobar\fetchPrivateWizzbang(); } public function accessOtherFizz(): \Foobar\Wizzbang { return new \Foobar\OtherFizz(); } } } namespace Foobar { function fetchPrivateWizzbang() { return new Wizzbang(); } /* private */ class OtherFizz extends Wizzbang { } } namespace { $x = new \App\ExternalClass(); var_dump($x->doStuff()); var_dump($x->accessOtherFizz()); }

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