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<?php interface FooInterface { public function foo(FooInterface $foo); } class Bar implements FooInterface { public function foo(FooInterface $foo): FooInterface { return new self(); } } $bar = new Bar(); $result = $bar->foo(new Bar()); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
object(Bar)#3 (0) { }

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