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<?php spl_autoload_register(function($class) { if ($class === 'A') { class A { public function foo($x): B { return new B; } } } else if ($class === 'B') { class B extends A { public function foo($x): C { return new C; } } } else if ($class === 'C') { class C extends B { } } }); (new C)->foo('blah');
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